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</pre><div class="example-wrap"><pre class="rust ">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">convert</span>::<span class="ident">TryFrom</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">fmt</span>;

<span class="kw">use</span> <span class="ident">geo</span>::<span class="ident">algorithm</span>::<span class="ident">area</span>::<span class="ident">Area</span>;
<span class="kw">use</span> <span class="ident">geo</span>::<span class="ident">algorithm</span>::<span class="ident">concave_hull</span>::<span class="ident">ConcaveHull</span>;
<span class="kw">use</span> <span class="ident">geo</span>::<span class="ident">algorithm</span>::<span class="ident">convex_hull</span>::<span class="ident">ConvexHull</span>;
<span class="kw">use</span> <span class="ident">geo_booleanop</span>::<span class="ident">boolean</span>::<span class="ident">BooleanOp</span>;
<span class="kw">use</span> <span class="ident">serde</span>::{<span class="ident">Deserialize</span>, <span class="ident">Serialize</span>};

<span class="kw">use</span> <span class="kw">crate</span>::{<span class="ident">Angle</span>, <span class="ident">Bounds</span>, <span class="ident">Distance</span>, <span class="ident">GPSBounds</span>, <span class="ident">HashablePt2D</span>, <span class="ident">PolyLine</span>, <span class="ident">Pt2D</span>, <span class="ident">Ring</span>};

<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">PartialEq</span>, <span class="ident">Serialize</span>, <span class="ident">Deserialize</span>, <span class="ident">Clone</span>, <span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Polygon</span> {
    <span class="ident">points</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Pt2D</span><span class="op">&gt;</span>,
    <span class="doccomment">/// Groups of three indices make up the triangles</span>
    <span class="ident">indices</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">u16</span><span class="op">&gt;</span>,

    <span class="doccomment">/// If the polygon has holes, explicitly store all the rings (the one outer and all of the</span>
    <span class="doccomment">/// inner) so they can later be used to generate outlines and such. If the polygon has no</span>
    <span class="doccomment">/// holes, then this will just be None, since the points form a ring.</span>
    <span class="ident">rings</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Ring</span><span class="op">&gt;</span><span class="op">&gt;</span>,
}

<span class="kw">impl</span> <span class="ident">Polygon</span> {
    <span class="comment">// TODO Last result when we&#39;ve got something that isn&#39;t a valid Ring, but want to draw it</span>
    <span class="comment">// anyway. Fix the root cause of those cases instead.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">buggy_new</span>(<span class="ident">orig_pts</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Pt2D</span><span class="op">&gt;</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Polygon</span> {
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">orig_pts</span>.<span class="ident">len</span>() <span class="op">&gt;</span><span class="op">=</span> <span class="number">3</span>);

        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">vertices</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
        <span class="kw">for</span> <span class="ident">pt</span> <span class="kw">in</span> <span class="kw-2">&amp;</span><span class="ident">orig_pts</span> {
            <span class="ident">vertices</span>.<span class="ident">push</span>(<span class="ident">pt</span>.<span class="ident">x</span>());
            <span class="ident">vertices</span>.<span class="ident">push</span>(<span class="ident">pt</span>.<span class="ident">y</span>());
        }
        <span class="kw">let</span> <span class="ident">indices</span> <span class="op">=</span> <span class="ident">downsize</span>(<span class="ident">earcutr</span>::<span class="ident">earcut</span>(<span class="kw-2">&amp;</span><span class="ident">vertices</span>, <span class="kw-2">&amp;</span><span class="ident">Vec</span>::<span class="ident">new</span>(), <span class="number">2</span>));

        <span class="ident">Polygon</span> {
            <span class="ident">points</span>: <span class="ident">orig_pts</span>.<span class="ident">clone</span>(),
            <span class="ident">indices</span>,
            <span class="ident">rings</span>: <span class="prelude-val">None</span>,
        }
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">with_holes</span>(<span class="ident">outer</span>: <span class="ident">Ring</span>, <span class="kw-2">mut</span> <span class="ident">inner</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Ring</span><span class="op">&gt;</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Polygon</span> {
        <span class="ident">inner</span>.<span class="ident">insert</span>(<span class="number">0</span>, <span class="ident">outer</span>);
        <span class="kw">let</span> <span class="ident">geojson_style</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">f64</span><span class="op">&gt;</span><span class="op">&gt;</span><span class="op">&gt;</span> <span class="op">=</span> <span class="ident">inner</span>
            .<span class="ident">iter</span>()
            .<span class="ident">map</span>(<span class="op">|</span><span class="ident">ring</span><span class="op">|</span> {
                <span class="ident">ring</span>.<span class="ident">points</span>()
                    .<span class="ident">into_iter</span>()
                    .<span class="ident">map</span>(<span class="op">|</span><span class="ident">pt</span><span class="op">|</span> <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">pt</span>.<span class="ident">x</span>(), <span class="ident">pt</span>.<span class="ident">y</span>()])
                    .<span class="ident">collect</span>()
            })
            .<span class="ident">collect</span>();
        <span class="kw">let</span> (<span class="ident">vertices</span>, <span class="ident">holes</span>, <span class="ident">dims</span>) <span class="op">=</span> <span class="ident">earcutr</span>::<span class="ident">flatten</span>(<span class="kw-2">&amp;</span><span class="ident">geojson_style</span>);
        <span class="kw">let</span> <span class="ident">indices</span> <span class="op">=</span> <span class="ident">downsize</span>(<span class="ident">earcutr</span>::<span class="ident">earcut</span>(<span class="kw-2">&amp;</span><span class="ident">vertices</span>, <span class="kw-2">&amp;</span><span class="ident">holes</span>, <span class="ident">dims</span>));

        <span class="ident">Polygon</span> {
            <span class="ident">points</span>: <span class="ident">vertices</span>
                .<span class="ident">chunks</span>(<span class="number">2</span>)
                .<span class="ident">map</span>(<span class="op">|</span><span class="ident">pair</span><span class="op">|</span> <span class="ident">Pt2D</span>::<span class="ident">new</span>(<span class="ident">pair</span>[<span class="number">0</span>], <span class="ident">pair</span>[<span class="number">1</span>]))
                .<span class="ident">collect</span>(),
            <span class="ident">indices</span>,
            <span class="ident">rings</span>: <span class="kw">if</span> <span class="ident">inner</span>.<span class="ident">len</span>() <span class="op">=</span><span class="op">=</span> <span class="number">1</span> { <span class="prelude-val">None</span> } <span class="kw">else</span> { <span class="prelude-val">Some</span>(<span class="ident">inner</span>) },
        }
    }

    <span class="comment">// TODO Doesn&#39;t remember rings yet</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">from_geojson</span>(<span class="ident">raw</span>: <span class="kw-2">&amp;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">f64</span><span class="op">&gt;</span><span class="op">&gt;</span><span class="op">&gt;</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Polygon</span> {
        <span class="kw">let</span> (<span class="ident">vertices</span>, <span class="ident">holes</span>, <span class="ident">dims</span>) <span class="op">=</span> <span class="ident">earcutr</span>::<span class="ident">flatten</span>(<span class="ident">raw</span>);
        <span class="kw">let</span> <span class="ident">indices</span> <span class="op">=</span> <span class="ident">downsize</span>(<span class="ident">earcutr</span>::<span class="ident">earcut</span>(<span class="kw-2">&amp;</span><span class="ident">vertices</span>, <span class="kw-2">&amp;</span><span class="ident">holes</span>, <span class="ident">dims</span>));
        <span class="ident">Polygon</span> {
            <span class="ident">points</span>: <span class="ident">vertices</span>
                .<span class="ident">chunks</span>(<span class="number">2</span>)
                .<span class="ident">map</span>(<span class="op">|</span><span class="ident">pair</span><span class="op">|</span> <span class="ident">Pt2D</span>::<span class="ident">new</span>(<span class="ident">pair</span>[<span class="number">0</span>], <span class="ident">pair</span>[<span class="number">1</span>]))
                .<span class="ident">collect</span>(),
            <span class="ident">indices</span>,
            <span class="ident">rings</span>: <span class="prelude-val">None</span>,
        }
    }

    <span class="comment">// TODO No guarantee points forms a ring. In fact, the main caller is from SVG-&gt;lyon parsing,</span>
    <span class="comment">// and it&#39;s NOT true there yet.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">precomputed</span>(<span class="ident">points</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Pt2D</span><span class="op">&gt;</span>, <span class="ident">indices</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Polygon</span> {
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">indices</span>.<span class="ident">len</span>() <span class="op">%</span> <span class="number">3</span> <span class="op">=</span><span class="op">=</span> <span class="number">0</span>);
        <span class="ident">Polygon</span> {
            <span class="ident">points</span>,
            <span class="ident">indices</span>: <span class="ident">downsize</span>(<span class="ident">indices</span>),
            <span class="ident">rings</span>: <span class="prelude-val">None</span>,
        }
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">from_triangle</span>(<span class="ident">tri</span>: <span class="kw-2">&amp;</span><span class="ident">Triangle</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Polygon</span> {
        <span class="ident">Polygon</span> {
            <span class="ident">points</span>: <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">tri</span>.<span class="ident">pt1</span>, <span class="ident">tri</span>.<span class="ident">pt2</span>, <span class="ident">tri</span>.<span class="ident">pt3</span>, <span class="ident">tri</span>.<span class="ident">pt1</span>],
            <span class="ident">indices</span>: <span class="macro">vec</span><span class="macro">!</span>[<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>],
            <span class="ident">rings</span>: <span class="prelude-val">None</span>,
        }
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">triangles</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Triangle</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">triangles</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Triangle</span><span class="op">&gt;</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
        <span class="kw">for</span> <span class="ident">slice</span> <span class="kw">in</span> <span class="self">self</span>.<span class="ident">indices</span>.<span class="ident">chunks_exact</span>(<span class="number">3</span>) {
            <span class="ident">triangles</span>.<span class="ident">push</span>(<span class="ident">Triangle</span>::<span class="ident">new</span>(
                <span class="self">self</span>.<span class="ident">points</span>[<span class="ident">slice</span>[<span class="number">0</span>] <span class="kw">as</span> <span class="ident">usize</span>],
                <span class="self">self</span>.<span class="ident">points</span>[<span class="ident">slice</span>[<span class="number">1</span>] <span class="kw">as</span> <span class="ident">usize</span>],
                <span class="self">self</span>.<span class="ident">points</span>[<span class="ident">slice</span>[<span class="number">2</span>] <span class="kw">as</span> <span class="ident">usize</span>],
            ));
        }
        <span class="ident">triangles</span>
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">raw_for_rendering</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> (<span class="kw-2">&amp;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Pt2D</span><span class="op">&gt;</span>, <span class="kw-2">&amp;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">u16</span><span class="op">&gt;</span>) {
        (<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">points</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">indices</span>)
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">contains_pt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">pt</span>: <span class="ident">Pt2D</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">bool</span> {
        <span class="self">self</span>.<span class="ident">triangles</span>().<span class="ident">into_iter</span>().<span class="ident">any</span>(<span class="op">|</span><span class="ident">tri</span><span class="op">|</span> <span class="ident">tri</span>.<span class="ident">contains_pt</span>(<span class="ident">pt</span>))
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_bounds</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Bounds</span> {
        <span class="ident">Bounds</span>::<span class="ident">from</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">points</span>)
    }

    <span class="kw">fn</span> <span class="ident">transform</span><span class="op">&lt;</span><span class="ident">F</span>: <span class="ident">Fn</span>(<span class="kw-2">&amp;</span><span class="ident">Pt2D</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Pt2D</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Polygon</span> {
        <span class="ident">Polygon</span> {
            <span class="ident">points</span>: <span class="self">self</span>.<span class="ident">points</span>.<span class="ident">iter</span>().<span class="ident">map</span>(<span class="kw-2">&amp;</span><span class="ident">f</span>).<span class="ident">collect</span>(),
            <span class="ident">indices</span>: <span class="self">self</span>.<span class="ident">indices</span>.<span class="ident">clone</span>(),
            <span class="ident">rings</span>: <span class="self">self</span>.<span class="ident">rings</span>.<span class="ident">as_ref</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">rings</span><span class="op">|</span> {
                <span class="ident">rings</span>
                    .<span class="ident">iter</span>()
                    <span class="comment">// When scaling, rings may collapse entirely; just give up on preserving in</span>
                    <span class="comment">// that case.</span>
                    .<span class="ident">filter_map</span>(<span class="op">|</span><span class="ident">ring</span><span class="op">|</span> <span class="ident">Ring</span>::<span class="ident">new</span>(<span class="ident">ring</span>.<span class="ident">points</span>().<span class="ident">iter</span>().<span class="ident">map</span>(<span class="kw-2">&amp;</span><span class="ident">f</span>).<span class="ident">collect</span>()).<span class="ident">ok</span>())
                    .<span class="ident">collect</span>()
            }),
        }
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">translate</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">dx</span>: <span class="ident">f64</span>, <span class="ident">dy</span>: <span class="ident">f64</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Polygon</span> {
        <span class="self">self</span>.<span class="ident">transform</span>(<span class="op">|</span><span class="ident">pt</span><span class="op">|</span> <span class="ident">pt</span>.<span class="ident">offset</span>(<span class="ident">dx</span>, <span class="ident">dy</span>))
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">scale</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">factor</span>: <span class="ident">f64</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Polygon</span> {
        <span class="self">self</span>.<span class="ident">transform</span>(<span class="op">|</span><span class="ident">pt</span><span class="op">|</span> <span class="ident">Pt2D</span>::<span class="ident">new</span>(<span class="ident">pt</span>.<span class="ident">x</span>() <span class="op">*</span> <span class="ident">factor</span>, <span class="ident">pt</span>.<span class="ident">y</span>() <span class="op">*</span> <span class="ident">factor</span>))
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">rotate</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">angle</span>: <span class="ident">Angle</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Polygon</span> {
        <span class="self">self</span>.<span class="ident">rotate_around</span>(<span class="ident">angle</span>, <span class="self">self</span>.<span class="ident">center</span>())
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">rotate_around</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">angle</span>: <span class="ident">Angle</span>, <span class="ident">pivot</span>: <span class="ident">Pt2D</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Polygon</span> {
        <span class="self">self</span>.<span class="ident">transform</span>(<span class="op">|</span><span class="ident">pt</span><span class="op">|</span> {
            <span class="kw">let</span> <span class="ident">origin_pt</span> <span class="op">=</span> <span class="ident">Pt2D</span>::<span class="ident">new</span>(<span class="ident">pt</span>.<span class="ident">x</span>() <span class="op">-</span> <span class="ident">pivot</span>.<span class="ident">x</span>(), <span class="ident">pt</span>.<span class="ident">y</span>() <span class="op">-</span> <span class="ident">pivot</span>.<span class="ident">y</span>());
            <span class="kw">let</span> (<span class="ident">sin</span>, <span class="ident">cos</span>) <span class="op">=</span> <span class="ident">angle</span>.<span class="ident">normalized_radians</span>().<span class="ident">sin_cos</span>();
            <span class="ident">Pt2D</span>::<span class="ident">new</span>(
                <span class="ident">pivot</span>.<span class="ident">x</span>() <span class="op">+</span> <span class="ident">origin_pt</span>.<span class="ident">x</span>() <span class="op">*</span> <span class="ident">cos</span> <span class="op">-</span> <span class="ident">origin_pt</span>.<span class="ident">y</span>() <span class="op">*</span> <span class="ident">sin</span>,
                <span class="ident">pivot</span>.<span class="ident">y</span>() <span class="op">+</span> <span class="ident">origin_pt</span>.<span class="ident">y</span>() <span class="op">*</span> <span class="ident">cos</span> <span class="op">+</span> <span class="ident">origin_pt</span>.<span class="ident">x</span>() <span class="op">*</span> <span class="ident">sin</span>,
            )
        })
    }

    <span class="doccomment">/// The order of these points depends on the constructor! The first and last point may or may</span>
    <span class="doccomment">/// not match. Polygons constructed from PolyLines will have a very weird order.</span>
    <span class="comment">// TODO rename outer_points to be clear</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">points</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="kw-2">&amp;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Pt2D</span><span class="op">&gt;</span> {
        <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="kw-2">ref</span> <span class="ident">rings</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">rings</span> {
            <span class="ident">rings</span>[<span class="number">0</span>].<span class="ident">points</span>()
        } <span class="kw">else</span> {
            <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">points</span>
        }
    }
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">into_points</span>(<span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Pt2D</span><span class="op">&gt;</span> {
        <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="kw-2">mut</span> <span class="ident">rings</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">rings</span>.<span class="ident">take</span>() {
            <span class="ident">rings</span>.<span class="ident">remove</span>(<span class="number">0</span>).<span class="ident">into_points</span>()
        } <span class="kw">else</span> {
            <span class="self">self</span>.<span class="ident">points</span>
        }
    }
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">into_ring</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Ring</span> {
        <span class="ident">Ring</span>::<span class="ident">must_new</span>(<span class="self">self</span>.<span class="ident">into_points</span>())
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">center</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Pt2D</span> {
        <span class="comment">// TODO dedupe just out of fear of the first/last point being repeated</span>
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">pts</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">HashablePt2D</span><span class="op">&gt;</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">points</span>.<span class="ident">iter</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">pt</span><span class="op">|</span> <span class="ident">pt</span>.<span class="ident">to_hashable</span>()).<span class="ident">collect</span>();
        <span class="ident">pts</span>.<span class="ident">sort</span>();
        <span class="ident">pts</span>.<span class="ident">dedup</span>();
        <span class="ident">Pt2D</span>::<span class="ident">center</span>(<span class="kw-2">&amp;</span><span class="ident">pts</span>.<span class="ident">iter</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">pt</span><span class="op">|</span> <span class="ident">pt</span>.<span class="ident">to_pt2d</span>()).<span class="ident">collect</span>())
    }

    <span class="doccomment">/// Top-left at the origin. Doesn&#39;t take Distance, because this is usually pixels, actually.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">rectangle</span>(<span class="ident">width</span>: <span class="ident">f64</span>, <span class="ident">height</span>: <span class="ident">f64</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Polygon</span> {
        <span class="ident">Polygon</span> {
            <span class="ident">points</span>: <span class="macro">vec</span><span class="macro">!</span>[
                <span class="ident">Pt2D</span>::<span class="ident">new</span>(<span class="number">0.0</span>, <span class="number">0.0</span>),
                <span class="ident">Pt2D</span>::<span class="ident">new</span>(<span class="ident">width</span>, <span class="number">0.0</span>),
                <span class="ident">Pt2D</span>::<span class="ident">new</span>(<span class="ident">width</span>, <span class="ident">height</span>),
                <span class="ident">Pt2D</span>::<span class="ident">new</span>(<span class="number">0.0</span>, <span class="ident">height</span>),
                <span class="ident">Pt2D</span>::<span class="ident">new</span>(<span class="number">0.0</span>, <span class="number">0.0</span>),
            ],
            <span class="ident">indices</span>: <span class="macro">vec</span><span class="macro">!</span>[<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">0</span>, <span class="number">2</span>, <span class="number">3</span>],
            <span class="ident">rings</span>: <span class="prelude-val">None</span>,
        }
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">rectangle_centered</span>(<span class="ident">center</span>: <span class="ident">Pt2D</span>, <span class="ident">width</span>: <span class="ident">Distance</span>, <span class="ident">height</span>: <span class="ident">Distance</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Polygon</span> {
        <span class="ident">Polygon</span>::<span class="ident">rectangle</span>(<span class="ident">width</span>.<span class="ident">inner_meters</span>(), <span class="ident">height</span>.<span class="ident">inner_meters</span>()).<span class="ident">translate</span>(
            <span class="ident">center</span>.<span class="ident">x</span>() <span class="op">-</span> <span class="ident">width</span>.<span class="ident">inner_meters</span>() <span class="op">/</span> <span class="number">2.0</span>,
            <span class="ident">center</span>.<span class="ident">y</span>() <span class="op">-</span> <span class="ident">height</span>.<span class="ident">inner_meters</span>() <span class="op">/</span> <span class="number">2.0</span>,
        )
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">rectangle_two_corners</span>(<span class="ident">pt1</span>: <span class="ident">Pt2D</span>, <span class="ident">pt2</span>: <span class="ident">Pt2D</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Polygon</span><span class="op">&gt;</span> {
        <span class="kw">if</span> <span class="ident">Pt2D</span>::<span class="ident">new</span>(<span class="ident">pt1</span>.<span class="ident">x</span>(), <span class="number">0.0</span>) <span class="op">=</span><span class="op">=</span> <span class="ident">Pt2D</span>::<span class="ident">new</span>(<span class="ident">pt2</span>.<span class="ident">x</span>(), <span class="number">0.0</span>)
            <span class="op">|</span><span class="op">|</span> <span class="ident">Pt2D</span>::<span class="ident">new</span>(<span class="number">0.0</span>, <span class="ident">pt1</span>.<span class="ident">y</span>()) <span class="op">=</span><span class="op">=</span> <span class="ident">Pt2D</span>::<span class="ident">new</span>(<span class="number">0.0</span>, <span class="ident">pt2</span>.<span class="ident">y</span>())
        {
            <span class="kw">return</span> <span class="prelude-val">None</span>;
        }

        <span class="kw">let</span> (<span class="ident">x1</span>, <span class="ident">width</span>) <span class="op">=</span> <span class="kw">if</span> <span class="ident">pt1</span>.<span class="ident">x</span>() <span class="op">&lt;</span> <span class="ident">pt2</span>.<span class="ident">x</span>() {
            (<span class="ident">pt1</span>.<span class="ident">x</span>(), <span class="ident">pt2</span>.<span class="ident">x</span>() <span class="op">-</span> <span class="ident">pt1</span>.<span class="ident">x</span>())
        } <span class="kw">else</span> {
            (<span class="ident">pt2</span>.<span class="ident">x</span>(), <span class="ident">pt1</span>.<span class="ident">x</span>() <span class="op">-</span> <span class="ident">pt2</span>.<span class="ident">x</span>())
        };
        <span class="kw">let</span> (<span class="ident">y1</span>, <span class="ident">height</span>) <span class="op">=</span> <span class="kw">if</span> <span class="ident">pt1</span>.<span class="ident">y</span>() <span class="op">&lt;</span> <span class="ident">pt2</span>.<span class="ident">y</span>() {
            (<span class="ident">pt1</span>.<span class="ident">y</span>(), <span class="ident">pt2</span>.<span class="ident">y</span>() <span class="op">-</span> <span class="ident">pt1</span>.<span class="ident">y</span>())
        } <span class="kw">else</span> {
            (<span class="ident">pt2</span>.<span class="ident">y</span>(), <span class="ident">pt1</span>.<span class="ident">y</span>() <span class="op">-</span> <span class="ident">pt2</span>.<span class="ident">y</span>())
        };
        <span class="prelude-val">Some</span>(<span class="ident">Polygon</span>::<span class="ident">rectangle</span>(<span class="ident">width</span>, <span class="ident">height</span>).<span class="ident">translate</span>(<span class="ident">x1</span>, <span class="ident">y1</span>))
    }

    <span class="doccomment">/// Top-left at the origin. Doesn&#39;t take Distance, because this is usually pixels, actually.</span>
    <span class="doccomment">/// If radius is None, be as round as possible. Fails if the radius is too big.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">maybe_rounded_rectangle</span>(<span class="ident">w</span>: <span class="ident">f64</span>, <span class="ident">h</span>: <span class="ident">f64</span>, <span class="ident">r</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">f64</span><span class="op">&gt;</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Polygon</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">r</span>.<span class="ident">unwrap_or_else</span>(<span class="op">|</span><span class="op">|</span> <span class="ident">w</span>.<span class="ident">min</span>(<span class="ident">h</span>) <span class="op">/</span> <span class="number">2.0</span>);
        <span class="kw">if</span> <span class="number">2.0</span> <span class="op">*</span> <span class="ident">r</span> <span class="op">&gt;</span> <span class="ident">w</span> <span class="op">|</span><span class="op">|</span> <span class="number">2.0</span> <span class="op">*</span> <span class="ident">r</span> <span class="op">&gt;</span> <span class="ident">h</span> {
            <span class="kw">return</span> <span class="prelude-val">None</span>;
        }

        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">pts</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[];

        <span class="kw">const</span> <span class="ident">RESOLUTION</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">5</span>;
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">arc</span> <span class="op">=</span> <span class="op">|</span><span class="ident">center</span>: <span class="ident">Pt2D</span>, <span class="ident">angle1_degs</span>: <span class="ident">f64</span>, <span class="ident">angle2_degs</span>: <span class="ident">f64</span><span class="op">|</span> {
            <span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="number">0</span>..<span class="op">=</span><span class="ident">RESOLUTION</span> {
                <span class="kw">let</span> <span class="ident">angle</span> <span class="op">=</span> <span class="ident">Angle</span>::<span class="ident">degrees</span>(
                    <span class="ident">angle1_degs</span> <span class="op">+</span> (<span class="ident">angle2_degs</span> <span class="op">-</span> <span class="ident">angle1_degs</span>) <span class="op">*</span> ((<span class="ident">i</span> <span class="kw">as</span> <span class="ident">f64</span>) <span class="op">/</span> (<span class="ident">RESOLUTION</span> <span class="kw">as</span> <span class="ident">f64</span>)),
                );
                <span class="ident">pts</span>.<span class="ident">push</span>(<span class="ident">center</span>.<span class="ident">project_away</span>(<span class="ident">Distance</span>::<span class="ident">meters</span>(<span class="ident">r</span>), <span class="ident">angle</span>.<span class="ident">invert_y</span>()));
            }
        };

        <span class="comment">// Top-left corner</span>
        <span class="ident">arc</span>(<span class="ident">Pt2D</span>::<span class="ident">new</span>(<span class="ident">r</span>, <span class="ident">r</span>), <span class="number">180.0</span>, <span class="number">90.0</span>);
        <span class="comment">// Top-right</span>
        <span class="ident">arc</span>(<span class="ident">Pt2D</span>::<span class="ident">new</span>(<span class="ident">w</span> <span class="op">-</span> <span class="ident">r</span>, <span class="ident">r</span>), <span class="number">90.0</span>, <span class="number">0.0</span>);
        <span class="comment">// Bottom-right</span>
        <span class="ident">arc</span>(<span class="ident">Pt2D</span>::<span class="ident">new</span>(<span class="ident">w</span> <span class="op">-</span> <span class="ident">r</span>, <span class="ident">h</span> <span class="op">-</span> <span class="ident">r</span>), <span class="number">360.0</span>, <span class="number">270.0</span>);
        <span class="comment">// Bottom-left</span>
        <span class="ident">arc</span>(<span class="ident">Pt2D</span>::<span class="ident">new</span>(<span class="ident">r</span>, <span class="ident">h</span> <span class="op">-</span> <span class="ident">r</span>), <span class="number">270.0</span>, <span class="number">180.0</span>);
        <span class="comment">// Close it off</span>
        <span class="ident">pts</span>.<span class="ident">push</span>(<span class="ident">Pt2D</span>::<span class="ident">new</span>(<span class="number">0.0</span>, <span class="ident">r</span>));

        <span class="comment">// If the radius was maximized, then some of the edges will be zero length.</span>
        <span class="ident">pts</span>.<span class="ident">dedup</span>();

        <span class="prelude-val">Some</span>(<span class="ident">Ring</span>::<span class="ident">must_new</span>(<span class="ident">pts</span>).<span class="ident">to_polygon</span>())
    }

    <span class="doccomment">/// Top-left at the origin. Doesn&#39;t take Distance, because this is usually pixels, actually.</span>
    <span class="doccomment">/// If radius is None, be as round as possible</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">rounded_rectangle</span>(<span class="ident">w</span>: <span class="ident">f64</span>, <span class="ident">h</span>: <span class="ident">f64</span>, <span class="ident">r</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">f64</span><span class="op">&gt;</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Polygon</span> {
        <span class="ident">Polygon</span>::<span class="ident">maybe_rounded_rectangle</span>(<span class="ident">w</span>, <span class="ident">h</span>, <span class="ident">r</span>).<span class="ident">unwrap</span>()
    }

    <span class="comment">// TODO Result won&#39;t be a nice Ring</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">union</span>(<span class="self">self</span>, <span class="ident">other</span>: <span class="ident">Polygon</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Polygon</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">points</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">points</span>;
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">indices</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">indices</span>;
        <span class="kw">let</span> <span class="ident">offset</span> <span class="op">=</span> <span class="ident">points</span>.<span class="ident">len</span>() <span class="kw">as</span> <span class="ident">u16</span>;
        <span class="ident">points</span>.<span class="ident">extend</span>(<span class="ident">other</span>.<span class="ident">points</span>);
        <span class="kw">for</span> <span class="ident">idx</span> <span class="kw">in</span> <span class="ident">other</span>.<span class="ident">indices</span> {
            <span class="ident">indices</span>.<span class="ident">push</span>(<span class="ident">offset</span> <span class="op">+</span> <span class="ident">idx</span>);
        }
        <span class="ident">Polygon</span> {
            <span class="ident">points</span>,
            <span class="ident">indices</span>,
            <span class="ident">rings</span>: <span class="prelude-val">None</span>,
        }
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">union_all</span>(<span class="kw-2">mut</span> <span class="ident">list</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Polygon</span><span class="op">&gt;</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Polygon</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">result</span> <span class="op">=</span> <span class="ident">list</span>.<span class="ident">pop</span>().<span class="ident">unwrap</span>();
        <span class="kw">for</span> <span class="ident">p</span> <span class="kw">in</span> <span class="ident">list</span> {
            <span class="ident">result</span> <span class="op">=</span> <span class="ident">result</span>.<span class="ident">union</span>(<span class="ident">p</span>);
        }
        <span class="ident">result</span>
    }

    <span class="comment">// TODO Result won&#39;t be a nice Ring</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">intersection</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&amp;</span><span class="ident">Polygon</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Polygon</span><span class="op">&gt;</span> {
        <span class="ident">from_multi</span>(<span class="ident">to_geo</span>(<span class="self">self</span>.<span class="ident">points</span>()).<span class="ident">intersection</span>(<span class="kw-2">&amp;</span><span class="ident">to_geo</span>(<span class="ident">other</span>.<span class="ident">points</span>())))
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">convex_hull</span>(<span class="ident">list</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Polygon</span><span class="op">&gt;</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Polygon</span> {
        <span class="kw">let</span> <span class="ident">mp</span>: <span class="ident">geo</span>::<span class="ident">MultiPolygon</span><span class="op">&lt;</span><span class="ident">f64</span><span class="op">&gt;</span> <span class="op">=</span> <span class="ident">list</span>.<span class="ident">into_iter</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">p</span><span class="op">|</span> <span class="ident">to_geo</span>(<span class="ident">p</span>.<span class="ident">points</span>())).<span class="ident">collect</span>();
        <span class="ident">mp</span>.<span class="ident">convex_hull</span>().<span class="ident">into</span>()
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">concave_hull</span>(<span class="ident">list</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Polygon</span><span class="op">&gt;</span>, <span class="ident">concavity</span>: <span class="ident">f64</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Polygon</span> {
        <span class="kw">let</span> <span class="ident">mp</span>: <span class="ident">geo</span>::<span class="ident">MultiPolygon</span><span class="op">&lt;</span><span class="ident">f64</span><span class="op">&gt;</span> <span class="op">=</span> <span class="ident">list</span>.<span class="ident">into_iter</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">p</span><span class="op">|</span> <span class="ident">to_geo</span>(<span class="ident">p</span>.<span class="ident">points</span>())).<span class="ident">collect</span>();
        <span class="ident">mp</span>.<span class="ident">concave_hull</span>(<span class="ident">concavity</span>).<span class="ident">into</span>()
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">polylabel</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Pt2D</span> {
        <span class="kw">let</span> <span class="ident">pt</span> <span class="op">=</span> <span class="ident">polylabel</span>::<span class="ident">polylabel</span>(<span class="kw-2">&amp;</span><span class="ident">to_geo</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">points</span>()), <span class="kw-2">&amp;</span><span class="number">1.0</span>).<span class="ident">unwrap</span>();
        <span class="ident">Pt2D</span>::<span class="ident">new</span>(<span class="ident">pt</span>.<span class="ident">x</span>(), <span class="ident">pt</span>.<span class="ident">y</span>())
    }

    <span class="doccomment">/// Creates the outline around the polygon, with the thickness half straddling the polygon and</span>
    <span class="doccomment">/// half of it just outside. Only works for polygons that&#39;re formed from rings. Those made from</span>
    <span class="doccomment">/// PolyLines won&#39;t work, for example.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_outline</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">thickness</span>: <span class="ident">Distance</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Polygon</span>, <span class="ident">String</span><span class="op">&gt;</span> {
        <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="kw-2">ref</span> <span class="ident">rings</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">rings</span> {
            <span class="prelude-val">Ok</span>(<span class="ident">Polygon</span>::<span class="ident">union_all</span>(
                <span class="ident">rings</span>.<span class="ident">iter</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">r</span><span class="op">|</span> <span class="ident">r</span>.<span class="ident">to_outline</span>(<span class="ident">thickness</span>)).<span class="ident">collect</span>(),
            ))
        } <span class="kw">else</span> {
            <span class="ident">Ring</span>::<span class="ident">new</span>(<span class="self">self</span>.<span class="ident">points</span>.<span class="ident">clone</span>()).<span class="ident">map</span>(<span class="op">|</span><span class="ident">r</span><span class="op">|</span> <span class="ident">r</span>.<span class="ident">to_outline</span>(<span class="ident">thickness</span>))
        }
    }

    <span class="doccomment">/// Remove the internal rings used for to_outline. This is fine to do if the polygon is being</span>
    <span class="doccomment">/// added to some larger piece of geometry that won&#39;t need an outline.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">strip_rings</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Polygon</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">p</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">clone</span>();
        <span class="ident">p</span>.<span class="ident">rings</span> <span class="op">=</span> <span class="prelude-val">None</span>;
        <span class="ident">p</span>
    }

    <span class="doccomment">/// Usually m^2, unless the polygon is in screen-space</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">area</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">f64</span> {
        <span class="comment">// Polygon orientation messes this up sometimes</span>
        <span class="ident">to_geo</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">points</span>()).<span class="ident">unsigned_area</span>()
    }

    <span class="doccomment">/// Doesn&#39;t handle multiple crossings in and out.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">clip_polyline</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">input</span>: <span class="kw-2">&amp;</span><span class="ident">PolyLine</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Pt2D</span><span class="op">&gt;</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="ident">ring</span> <span class="op">=</span> <span class="ident">Ring</span>::<span class="ident">must_new</span>(<span class="self">self</span>.<span class="ident">points</span>.<span class="ident">clone</span>());
        <span class="kw">let</span> <span class="ident">hits</span> <span class="op">=</span> <span class="ident">ring</span>.<span class="ident">all_intersections</span>(<span class="ident">input</span>);

        <span class="kw">if</span> <span class="ident">hits</span>.<span class="ident">len</span>() <span class="op">=</span><span class="op">=</span> <span class="number">0</span> {
            <span class="comment">// All the points must be inside, or none</span>
            <span class="kw">if</span> <span class="self">self</span>.<span class="ident">contains_pt</span>(<span class="ident">input</span>.<span class="ident">first_pt</span>()) {
                <span class="prelude-val">Some</span>(<span class="ident">input</span>.<span class="ident">points</span>().<span class="ident">clone</span>())
            } <span class="kw">else</span> {
                <span class="prelude-val">None</span>
            }
        } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">hits</span>.<span class="ident">len</span>() <span class="op">=</span><span class="op">=</span> <span class="number">1</span> {
            <span class="comment">// Which end?</span>
            <span class="kw">if</span> <span class="self">self</span>.<span class="ident">contains_pt</span>(<span class="ident">input</span>.<span class="ident">first_pt</span>()) {
                <span class="ident">input</span>
                    .<span class="ident">get_slice_ending_at</span>(<span class="ident">hits</span>[<span class="number">0</span>])
                    .<span class="ident">map</span>(<span class="op">|</span><span class="ident">pl</span><span class="op">|</span> <span class="ident">pl</span>.<span class="ident">into_points</span>())
            } <span class="kw">else</span> {
                <span class="ident">input</span>
                    .<span class="ident">get_slice_starting_at</span>(<span class="ident">hits</span>[<span class="number">0</span>])
                    .<span class="ident">map</span>(<span class="op">|</span><span class="ident">pl</span><span class="op">|</span> <span class="ident">pl</span>.<span class="ident">into_points</span>())
            }
        } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">hits</span>.<span class="ident">len</span>() <span class="op">=</span><span class="op">=</span> <span class="number">2</span> {
            <span class="prelude-val">Some</span>(<span class="ident">input</span>.<span class="ident">trim_to_endpts</span>(<span class="ident">hits</span>[<span class="number">0</span>], <span class="ident">hits</span>[<span class="number">1</span>]).<span class="ident">into_points</span>())
        } <span class="kw">else</span> {
            <span class="comment">// TODO Not handled</span>
            <span class="prelude-val">None</span>
        }
    }

    <span class="comment">// TODO Only handles a few cases</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">clip_ring</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">input</span>: <span class="kw-2">&amp;</span><span class="ident">Ring</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Pt2D</span><span class="op">&gt;</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="ident">ring</span> <span class="op">=</span> <span class="ident">Ring</span>::<span class="ident">must_new</span>(<span class="self">self</span>.<span class="ident">points</span>.<span class="ident">clone</span>());
        <span class="kw">let</span> <span class="ident">hits</span> <span class="op">=</span> <span class="ident">ring</span>.<span class="ident">all_intersections</span>(<span class="kw-2">&amp;</span><span class="ident">PolyLine</span>::<span class="ident">unchecked_new</span>(<span class="ident">input</span>.<span class="ident">clone</span>().<span class="ident">into_points</span>()));

        <span class="kw">if</span> <span class="ident">hits</span>.<span class="ident">len</span>() <span class="op">=</span><span class="op">=</span> <span class="number">0</span> {
            <span class="comment">// If the first point is inside, then all must be</span>
            <span class="kw">if</span> <span class="self">self</span>.<span class="ident">contains_pt</span>(<span class="ident">input</span>.<span class="ident">points</span>()[<span class="number">0</span>]) {
                <span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="ident">input</span>.<span class="ident">points</span>().<span class="ident">clone</span>());
            }
        } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">hits</span>.<span class="ident">len</span>() <span class="op">=</span><span class="op">=</span> <span class="number">2</span> {
            <span class="kw">let</span> (<span class="ident">pl1</span>, <span class="ident">pl2</span>) <span class="op">=</span> <span class="ident">input</span>.<span class="ident">get_both_slices_btwn</span>(<span class="ident">hits</span>[<span class="number">0</span>], <span class="ident">hits</span>[<span class="number">1</span>])<span class="question-mark">?</span>;

            <span class="comment">// One of these should be partly outside the polygon. The endpoints won&#39;t be in the</span>
            <span class="comment">// polygon itself, but they&#39;ll be on the ring.</span>
            <span class="kw">if</span> <span class="ident">pl1</span>
                .<span class="ident">points</span>()
                .<span class="ident">iter</span>()
                .<span class="ident">all</span>(<span class="op">|</span><span class="ident">pt</span><span class="op">|</span> <span class="self">self</span>.<span class="ident">contains_pt</span>(<span class="kw-2">*</span><span class="ident">pt</span>) <span class="op">|</span><span class="op">|</span> <span class="ident">ring</span>.<span class="ident">contains_pt</span>(<span class="kw-2">*</span><span class="ident">pt</span>))
            {
                <span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="ident">pl1</span>.<span class="ident">into_points</span>());
            }
            <span class="kw">if</span> <span class="ident">pl2</span>
                .<span class="ident">points</span>()
                .<span class="ident">iter</span>()
                .<span class="ident">all</span>(<span class="op">|</span><span class="ident">pt</span><span class="op">|</span> <span class="self">self</span>.<span class="ident">contains_pt</span>(<span class="kw-2">*</span><span class="ident">pt</span>) <span class="op">|</span><span class="op">|</span> <span class="ident">ring</span>.<span class="ident">contains_pt</span>(<span class="kw-2">*</span><span class="ident">pt</span>))
            {
                <span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="ident">pl2</span>.<span class="ident">into_points</span>());
            }
            <span class="comment">// Huh?</span>
        }

        <span class="prelude-val">None</span>
    }

    <span class="doccomment">/// If the polygon is just a single outer ring, produces a GeoJSON polygon. Otherwise, produces</span>
    <span class="doccomment">/// a GeoJSON multipolygon consisting of individual triangles. Optionally map the world-space</span>
    <span class="doccomment">/// points back to GPS.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_geojson</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">gps</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">GPSBounds</span><span class="op">&gt;</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">geojson</span>::<span class="ident">Geometry</span> {
        <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="ident">ring</span>) <span class="op">=</span> <span class="ident">Ring</span>::<span class="ident">new</span>(<span class="self">self</span>.<span class="ident">points</span>.<span class="ident">clone</span>()) {
            <span class="kw">return</span> <span class="ident">ring</span>.<span class="ident">to_geojson</span>(<span class="ident">gps</span>);
        }

        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">polygons</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
        <span class="kw">for</span> <span class="ident">triangle</span> <span class="kw">in</span> <span class="self">self</span>.<span class="ident">triangles</span>() {
            <span class="kw">let</span> <span class="ident">raw_pts</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">triangle</span>.<span class="ident">pt1</span>, <span class="ident">triangle</span>.<span class="ident">pt2</span>, <span class="ident">triangle</span>.<span class="ident">pt3</span>, <span class="ident">triangle</span>.<span class="ident">pt1</span>];
            <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">pts</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
            <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="kw-2">ref</span> <span class="ident">gps</span>) <span class="op">=</span> <span class="ident">gps</span> {
                <span class="kw">for</span> <span class="ident">pt</span> <span class="kw">in</span> <span class="ident">gps</span>.<span class="ident">convert_back</span>(<span class="kw-2">&amp;</span><span class="ident">raw_pts</span>) {
                    <span class="ident">pts</span>.<span class="ident">push</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="ident">pt</span>.<span class="ident">x</span>(), <span class="ident">pt</span>.<span class="ident">y</span>()]);
                }
            } <span class="kw">else</span> {
                <span class="kw">for</span> <span class="ident">pt</span> <span class="kw">in</span> <span class="ident">raw_pts</span> {
                    <span class="ident">pts</span>.<span class="ident">push</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="ident">pt</span>.<span class="ident">x</span>(), <span class="ident">pt</span>.<span class="ident">y</span>()]);
                }
            }
            <span class="ident">polygons</span>.<span class="ident">push</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="ident">pts</span>]);
        }

        <span class="ident">geojson</span>::<span class="ident">Geometry</span>::<span class="ident">new</span>(<span class="ident">geojson</span>::<span class="ident">Value</span>::<span class="ident">MultiPolygon</span>(<span class="ident">polygons</span>))
    }
}

<span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Display</span> <span class="kw">for</span> <span class="ident">Polygon</span> {
    <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
        <span class="macro">writeln</span><span class="macro">!</span>(
            <span class="ident">f</span>,
            <span class="string">&quot;Polygon with {} points and {} indices&quot;</span>,
            <span class="self">self</span>.<span class="ident">points</span>.<span class="ident">len</span>(),
            <span class="self">self</span>.<span class="ident">indices</span>.<span class="ident">len</span>()
        )<span class="question-mark">?</span>;
        <span class="kw">for</span> (<span class="ident">idx</span>, <span class="ident">pt</span>) <span class="kw">in</span> <span class="self">self</span>.<span class="ident">points</span>.<span class="ident">iter</span>().<span class="ident">enumerate</span>() {
            <span class="macro">writeln</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">&quot;  {}: {}&quot;</span>, <span class="ident">idx</span>, <span class="ident">pt</span>)<span class="question-mark">?</span>;
        }
        <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">&quot;Indices: [&quot;</span>)<span class="question-mark">?</span>;
        <span class="kw">for</span> <span class="ident">slice</span> <span class="kw">in</span> <span class="self">self</span>.<span class="ident">indices</span>.<span class="ident">chunks_exact</span>(<span class="number">3</span>) {
            <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">&quot;({}, {}, {}), &quot;</span>, <span class="ident">slice</span>[<span class="number">0</span>], <span class="ident">slice</span>[<span class="number">1</span>], <span class="ident">slice</span>[<span class="number">2</span>])<span class="question-mark">?</span>;
        }
        <span class="macro">writeln</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">&quot;]&quot;</span>)
    }
}

<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Triangle</span> {
    <span class="kw">pub</span> <span class="ident">pt1</span>: <span class="ident">Pt2D</span>,
    <span class="kw">pub</span> <span class="ident">pt2</span>: <span class="ident">Pt2D</span>,
    <span class="kw">pub</span> <span class="ident">pt3</span>: <span class="ident">Pt2D</span>,
}

<span class="kw">impl</span> <span class="ident">Triangle</span> {
    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">pt1</span>: <span class="ident">Pt2D</span>, <span class="ident">pt2</span>: <span class="ident">Pt2D</span>, <span class="ident">pt3</span>: <span class="ident">Pt2D</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Triangle</span> {
        <span class="ident">Triangle</span> { <span class="ident">pt1</span>, <span class="ident">pt2</span>, <span class="ident">pt3</span> }
    }

    <span class="kw">fn</span> <span class="ident">contains_pt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">pt</span>: <span class="ident">Pt2D</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">bool</span> {
        <span class="kw">let</span> <span class="ident">x1</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">pt1</span>.<span class="ident">x</span>();
        <span class="kw">let</span> <span class="ident">y1</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">pt1</span>.<span class="ident">y</span>();
        <span class="kw">let</span> <span class="ident">x2</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">pt2</span>.<span class="ident">x</span>();
        <span class="kw">let</span> <span class="ident">y2</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">pt2</span>.<span class="ident">y</span>();
        <span class="kw">let</span> <span class="ident">x3</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">pt3</span>.<span class="ident">x</span>();
        <span class="kw">let</span> <span class="ident">y3</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">pt3</span>.<span class="ident">y</span>();
        <span class="kw">let</span> <span class="ident">px</span> <span class="op">=</span> <span class="ident">pt</span>.<span class="ident">x</span>();
        <span class="kw">let</span> <span class="ident">py</span> <span class="op">=</span> <span class="ident">pt</span>.<span class="ident">y</span>();

        <span class="comment">// Barycentric coefficients for pt</span>
        <span class="comment">// Use epsilon to deal with small denominators</span>
        <span class="kw">let</span> <span class="ident">epsilon</span> <span class="op">=</span> <span class="number">0.000_000_1</span>;
        <span class="kw">let</span> <span class="ident">l0</span> <span class="op">=</span> ((<span class="ident">y2</span> <span class="op">-</span> <span class="ident">y3</span>) <span class="op">*</span> (<span class="ident">px</span> <span class="op">-</span> <span class="ident">x3</span>) <span class="op">+</span> (<span class="ident">x3</span> <span class="op">-</span> <span class="ident">x2</span>) <span class="op">*</span> (<span class="ident">py</span> <span class="op">-</span> <span class="ident">y3</span>))
            <span class="op">/</span> (((<span class="ident">y2</span> <span class="op">-</span> <span class="ident">y3</span>) <span class="op">*</span> (<span class="ident">x1</span> <span class="op">-</span> <span class="ident">x3</span>) <span class="op">+</span> (<span class="ident">x3</span> <span class="op">-</span> <span class="ident">x2</span>) <span class="op">*</span> (<span class="ident">y1</span> <span class="op">-</span> <span class="ident">y3</span>)) <span class="op">+</span> <span class="ident">epsilon</span>);
        <span class="kw">let</span> <span class="ident">l1</span> <span class="op">=</span> ((<span class="ident">y3</span> <span class="op">-</span> <span class="ident">y1</span>) <span class="op">*</span> (<span class="ident">px</span> <span class="op">-</span> <span class="ident">x3</span>) <span class="op">+</span> (<span class="ident">x1</span> <span class="op">-</span> <span class="ident">x3</span>) <span class="op">*</span> (<span class="ident">py</span> <span class="op">-</span> <span class="ident">y3</span>))
            <span class="op">/</span> (((<span class="ident">y2</span> <span class="op">-</span> <span class="ident">y3</span>) <span class="op">*</span> (<span class="ident">x1</span> <span class="op">-</span> <span class="ident">x3</span>) <span class="op">+</span> (<span class="ident">x3</span> <span class="op">-</span> <span class="ident">x2</span>) <span class="op">*</span> (<span class="ident">y1</span> <span class="op">-</span> <span class="ident">y3</span>)) <span class="op">+</span> <span class="ident">epsilon</span>);
        <span class="kw">let</span> <span class="ident">l2</span> <span class="op">=</span> <span class="number">1.0</span> <span class="op">-</span> <span class="ident">l0</span> <span class="op">-</span> <span class="ident">l1</span>;

        <span class="kw">for</span> <span class="ident">x</span> <span class="kw">in</span> <span class="kw-2">&amp;</span>[<span class="ident">l0</span>, <span class="ident">l1</span>, <span class="ident">l2</span>] {
            <span class="kw">if</span> <span class="kw-2">*</span><span class="ident">x</span> <span class="op">&gt;</span><span class="op">=</span> <span class="number">1.0</span> <span class="op">|</span><span class="op">|</span> <span class="kw-2">*</span><span class="ident">x</span> <span class="op">&lt;</span><span class="op">=</span> <span class="number">0.0</span> {
                <span class="kw">return</span> <span class="bool-val">false</span>;
            }
        }
        <span class="bool-val">true</span>
    }
}

<span class="kw">fn</span> <span class="ident">to_geo</span>(<span class="ident">pts</span>: <span class="kw-2">&amp;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Pt2D</span><span class="op">&gt;</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">geo</span>::<span class="ident">Polygon</span><span class="op">&lt;</span><span class="ident">f64</span><span class="op">&gt;</span> {
    <span class="ident">geo</span>::<span class="ident">Polygon</span>::<span class="ident">new</span>(
        <span class="ident">geo</span>::<span class="ident">LineString</span>::<span class="ident">from</span>(
            <span class="ident">pts</span>.<span class="ident">iter</span>()
                .<span class="ident">map</span>(<span class="op">|</span><span class="ident">pt</span><span class="op">|</span> <span class="ident">geo</span>::<span class="ident">Point</span>::<span class="ident">new</span>(<span class="ident">pt</span>.<span class="ident">x</span>(), <span class="ident">pt</span>.<span class="ident">y</span>()))
                .<span class="ident">collect</span>::<span class="op">&lt;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="kw">_</span><span class="op">&gt;</span><span class="op">&gt;</span>(),
        ),
        <span class="ident">Vec</span>::<span class="ident">new</span>(),
    )
}

<span class="kw">impl</span> <span class="ident">From</span><span class="op">&lt;</span><span class="ident">geo</span>::<span class="ident">Polygon</span><span class="op">&lt;</span><span class="ident">f64</span><span class="op">&gt;</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">Polygon</span> {
    <span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">poly</span>: <span class="ident">geo</span>::<span class="ident">Polygon</span><span class="op">&lt;</span><span class="ident">f64</span><span class="op">&gt;</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="self">Self</span> {
        <span class="kw">let</span> (<span class="ident">exterior</span>, <span class="ident">interiors</span>) <span class="op">=</span> <span class="ident">poly</span>.<span class="ident">into_inner</span>();
        <span class="ident">Polygon</span>::<span class="ident">with_holes</span>(
            <span class="ident">Ring</span>::<span class="ident">from</span>(<span class="ident">exterior</span>),
            <span class="ident">interiors</span>.<span class="ident">into_iter</span>().<span class="ident">map</span>(<span class="ident">Ring</span>::<span class="ident">from</span>).<span class="ident">collect</span>(),
        )
    }
}

<span class="kw">impl</span> <span class="ident">From</span><span class="op">&lt;</span><span class="ident">Polygon</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">geo</span>::<span class="ident">Polygon</span><span class="op">&lt;</span><span class="ident">f64</span><span class="op">&gt;</span> {
    <span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">poly</span>: <span class="ident">Polygon</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="self">Self</span> {
        <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="kw-2">mut</span> <span class="ident">rings</span>) <span class="op">=</span> <span class="ident">poly</span>.<span class="ident">rings</span> {
            <span class="kw">let</span> <span class="ident">exterior</span> <span class="op">=</span> <span class="ident">rings</span>.<span class="ident">pop</span>().<span class="ident">expect</span>(<span class="string">&quot;expected poly.rings[0] to be exterior&quot;</span>);
            <span class="kw">let</span> <span class="ident">interiors</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">geo</span>::<span class="ident">LineString</span><span class="op">&lt;</span><span class="ident">f64</span><span class="op">&gt;</span><span class="op">&gt;</span> <span class="op">=</span>
                <span class="ident">rings</span>.<span class="ident">into_iter</span>().<span class="ident">map</span>(<span class="ident">geo</span>::<span class="ident">LineString</span>::<span class="ident">from</span>).<span class="ident">collect</span>();
            <span class="self">Self</span>::<span class="ident">new</span>(<span class="ident">exterior</span>.<span class="ident">into</span>(), <span class="ident">interiors</span>)
        } <span class="kw">else</span> {
            <span class="kw">let</span> <span class="ident">exterior_coords</span> <span class="op">=</span> <span class="ident">poly</span>
                .<span class="ident">points</span>
                .<span class="ident">into_iter</span>()
                .<span class="ident">map</span>(<span class="ident">geo</span>::<span class="ident">Coordinate</span>::<span class="ident">from</span>)
                .<span class="ident">collect</span>::<span class="op">&lt;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="kw">_</span><span class="op">&gt;</span><span class="op">&gt;</span>();
            <span class="kw">let</span> <span class="ident">exterior</span> <span class="op">=</span> <span class="ident">geo</span>::<span class="ident">LineString</span>(<span class="ident">exterior_coords</span>);
            <span class="self">Self</span>::<span class="ident">new</span>(<span class="ident">exterior</span>, <span class="ident">Vec</span>::<span class="ident">new</span>())
        }
    }
}

<span class="kw">fn</span> <span class="ident">from_multi</span>(<span class="ident">multi</span>: <span class="ident">geo</span>::<span class="ident">MultiPolygon</span><span class="op">&lt;</span><span class="ident">f64</span><span class="op">&gt;</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Polygon</span><span class="op">&gt;</span> {
    <span class="comment">// TODO This should just call Polygon::from, but while importing maps, it seems like</span>
    <span class="comment">// intersection() is hitting non-Ring cases that crash. So keep using buggy_new for now.</span>
    <span class="ident">multi</span>
        .<span class="ident">into_iter</span>()
        .<span class="ident">map</span>(<span class="op">|</span><span class="ident">p</span><span class="op">|</span> {
            <span class="kw">let</span> <span class="ident">pts</span> <span class="op">=</span> <span class="ident">p</span>
                .<span class="ident">into_inner</span>()
                .<span class="number">0</span>
                .<span class="ident">into_points</span>()
                .<span class="ident">into_iter</span>()
                .<span class="ident">map</span>(<span class="op">|</span><span class="ident">pt</span><span class="op">|</span> <span class="ident">Pt2D</span>::<span class="ident">new</span>(<span class="ident">pt</span>.<span class="ident">x</span>(), <span class="ident">pt</span>.<span class="ident">y</span>()))
                .<span class="ident">collect</span>();
            <span class="ident">Polygon</span>::<span class="ident">buggy_new</span>(<span class="ident">pts</span>)
        })
        .<span class="ident">collect</span>()
}

<span class="kw">fn</span> <span class="ident">downsize</span>(<span class="ident">input</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">u16</span><span class="op">&gt;</span> {
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">output</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
    <span class="kw">for</span> <span class="ident">x</span> <span class="kw">in</span> <span class="ident">input</span> {
        <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="ident">x</span>) <span class="op">=</span> <span class="ident">u16</span>::<span class="ident">try_from</span>(<span class="ident">x</span>) {
            <span class="ident">output</span>.<span class="ident">push</span>(<span class="ident">x</span>);
        } <span class="kw">else</span> {
            <span class="macro">panic</span><span class="macro">!</span>(<span class="string">&quot;{} can&#39;t fit in u16, some polygon is too huge&quot;</span>, <span class="ident">x</span>);
        }
    }
    <span class="ident">output</span>
}
</pre></div>
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