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</pre><div class="example-wrap"><pre class="rust ">
<span class="doccomment">//! Naming is confusing, but RawMap -&gt; InitialMap -&gt; Map. InitialMap is separate pretty much just</span>
<span class="doccomment">//! for the step of producing &lt;https://dabreegster.github.io/abstreet/map/importing/geometry.html&gt;.</span>

<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::{<span class="ident">BTreeMap</span>, <span class="ident">BTreeSet</span>};

<span class="kw">use</span> <span class="ident">lane_specs</span>::<span class="ident">LaneSpec</span>;

<span class="kw">use</span> <span class="ident">abstutil</span>::{<span class="ident">Tags</span>, <span class="ident">Timer</span>};
<span class="kw">use</span> <span class="ident">geom</span>::{<span class="ident">Bounds</span>, <span class="ident">Circle</span>, <span class="ident">Distance</span>, <span class="ident">PolyLine</span>, <span class="ident">Polygon</span>, <span class="ident">Pt2D</span>};

<span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">geometry</span>::<span class="ident">intersection_polygon</span>;
<span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">raw</span>::{<span class="ident">OriginalRoad</span>, <span class="ident">RawMap</span>, <span class="ident">RawRoad</span>};
<span class="kw">use</span> <span class="kw">crate</span>::{<span class="ident">osm</span>, <span class="ident">IntersectionType</span>, <span class="ident">MapConfig</span>};

<span class="kw">mod</span> <span class="ident">geometry</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">lane_specs</span>;

<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">InitialMap</span> {
    <span class="kw">pub</span> <span class="ident">roads</span>: <span class="ident">BTreeMap</span><span class="op">&lt;</span><span class="ident">OriginalRoad</span>, <span class="ident">Road</span><span class="op">&gt;</span>,
    <span class="kw">pub</span> <span class="ident">intersections</span>: <span class="ident">BTreeMap</span><span class="op">&lt;</span><span class="ident">osm</span>::<span class="ident">NodeID</span>, <span class="ident">Intersection</span><span class="op">&gt;</span>,

    <span class="kw">pub</span> <span class="ident">bounds</span>: <span class="ident">Bounds</span>,
}

<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Road</span> {
    <span class="comment">// Redundant but useful to embed</span>
    <span class="kw">pub</span> <span class="ident">id</span>: <span class="ident">OriginalRoad</span>,
    <span class="kw">pub</span> <span class="ident">src_i</span>: <span class="ident">osm</span>::<span class="ident">NodeID</span>,
    <span class="kw">pub</span> <span class="ident">dst_i</span>: <span class="ident">osm</span>::<span class="ident">NodeID</span>,
    <span class="comment">// The true center of the road, including sidewalks</span>
    <span class="kw">pub</span> <span class="ident">trimmed_center_pts</span>: <span class="ident">PolyLine</span>,
    <span class="kw">pub</span> <span class="ident">half_width</span>: <span class="ident">Distance</span>,
    <span class="kw">pub</span> <span class="ident">lane_specs_ltr</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">LaneSpec</span><span class="op">&gt;</span>,
    <span class="kw">pub</span> <span class="ident">osm_tags</span>: <span class="ident">Tags</span>,
}

<span class="kw">impl</span> <span class="ident">Road</span> {
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">id</span>: <span class="ident">OriginalRoad</span>, <span class="ident">r</span>: <span class="kw-2">&amp;</span><span class="ident">RawRoad</span>, <span class="ident">cfg</span>: <span class="kw-2">&amp;</span><span class="ident">MapConfig</span>) <span class="op">-&gt;</span> <span class="ident">Road</span> {
        <span class="kw">let</span> <span class="ident">lane_specs_ltr</span> <span class="op">=</span> <span class="ident">lane_specs</span>::<span class="ident">get_lane_specs_ltr</span>(<span class="kw-2">&amp;</span><span class="ident">r</span>.<span class="ident">osm_tags</span>, <span class="ident">cfg</span>);
        <span class="kw">let</span> (<span class="ident">trimmed_center_pts</span>, <span class="ident">total_width</span>) <span class="op">=</span> <span class="ident">r</span>.<span class="ident">get_geometry</span>(<span class="ident">id</span>, <span class="ident">cfg</span>);

        <span class="ident">Road</span> {
            <span class="ident">id</span>,
            <span class="ident">src_i</span>: <span class="ident">id</span>.<span class="ident">i1</span>,
            <span class="ident">dst_i</span>: <span class="ident">id</span>.<span class="ident">i2</span>,
            <span class="ident">trimmed_center_pts</span>,
            <span class="ident">half_width</span>: <span class="ident">total_width</span> <span class="op">/</span> <span class="number">2.0</span>,
            <span class="ident">lane_specs_ltr</span>,
            <span class="ident">osm_tags</span>: <span class="ident">r</span>.<span class="ident">osm_tags</span>.<span class="ident">clone</span>(),
        }
    }
}

<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Intersection</span> {
    <span class="comment">// Redundant but useful to embed</span>
    <span class="kw">pub</span> <span class="ident">id</span>: <span class="ident">osm</span>::<span class="ident">NodeID</span>,
    <span class="kw">pub</span> <span class="ident">polygon</span>: <span class="ident">Polygon</span>,
    <span class="kw">pub</span> <span class="ident">roads</span>: <span class="ident">BTreeSet</span><span class="op">&lt;</span><span class="ident">OriginalRoad</span><span class="op">&gt;</span>,
    <span class="kw">pub</span> <span class="ident">intersection_type</span>: <span class="ident">IntersectionType</span>,
    <span class="kw">pub</span> <span class="ident">elevation</span>: <span class="ident">Distance</span>,
}

<span class="kw">impl</span> <span class="ident">InitialMap</span> {
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">raw</span>: <span class="kw-2">&amp;</span><span class="ident">RawMap</span>, <span class="ident">bounds</span>: <span class="kw-2">&amp;</span><span class="ident">Bounds</span>, <span class="ident">timer</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Timer</span>) <span class="op">-&gt;</span> <span class="ident">InitialMap</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">m</span> <span class="op">=</span> <span class="ident">InitialMap</span> {
            <span class="ident">roads</span>: <span class="ident">BTreeMap</span>::<span class="ident">new</span>(),
            <span class="ident">intersections</span>: <span class="ident">BTreeMap</span>::<span class="ident">new</span>(),
            <span class="ident">bounds</span>: <span class="ident">bounds</span>.<span class="ident">clone</span>(),
        };

        <span class="kw">for</span> (<span class="ident">id</span>, <span class="ident">i</span>) <span class="kw">in</span> <span class="kw-2">&amp;</span><span class="ident">raw</span>.<span class="ident">intersections</span> {
            <span class="ident">m</span>.<span class="ident">intersections</span>.<span class="ident">insert</span>(
                <span class="kw-2">*</span><span class="ident">id</span>,
                <span class="ident">Intersection</span> {
                    <span class="ident">id</span>: <span class="kw-2">*</span><span class="ident">id</span>,
                    <span class="comment">// Dummy thing to start with</span>
                    <span class="ident">polygon</span>: <span class="ident">Circle</span>::<span class="ident">new</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">Distance</span>::<span class="ident">meters</span>(<span class="number">1.0</span>)).<span class="ident">to_polygon</span>(),
                    <span class="ident">roads</span>: <span class="ident">BTreeSet</span>::<span class="ident">new</span>(),
                    <span class="ident">intersection_type</span>: <span class="ident">i</span>.<span class="ident">intersection_type</span>,
                    <span class="ident">elevation</span>: <span class="ident">i</span>.<span class="ident">elevation</span>,
                },
            );
        }

        <span class="kw">for</span> (<span class="ident">id</span>, <span class="ident">r</span>) <span class="kw">in</span> <span class="kw-2">&amp;</span><span class="ident">raw</span>.<span class="ident">roads</span> {
            <span class="kw">if</span> <span class="ident">id</span>.<span class="ident">i1</span> <span class="op">==</span> <span class="ident">id</span>.<span class="ident">i2</span> {
                <span class="ident">timer</span>.<span class="ident">warn</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;Skipping loop {}&quot;</span>, <span class="ident">id</span>));
                <span class="kw">continue</span>;
            }
            <span class="kw">if</span> <span class="ident">PolyLine</span>::<span class="ident">new</span>(<span class="ident">r</span>.<span class="ident">center_points</span>.<span class="ident">clone</span>()).<span class="ident">is_err</span>() {
                <span class="ident">timer</span>.<span class="ident">warn</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;Skipping broken geom {}&quot;</span>, <span class="ident">id</span>));
                <span class="kw">continue</span>;
            }

            <span class="ident">m</span>.<span class="ident">intersections</span>.<span class="ident">get_mut</span>(<span class="kw-2">&amp;</span><span class="ident">id</span>.<span class="ident">i1</span>).<span class="ident">unwrap</span>().<span class="ident">roads</span>.<span class="ident">insert</span>(<span class="kw-2">*</span><span class="ident">id</span>);
            <span class="ident">m</span>.<span class="ident">intersections</span>.<span class="ident">get_mut</span>(<span class="kw-2">&amp;</span><span class="ident">id</span>.<span class="ident">i2</span>).<span class="ident">unwrap</span>().<span class="ident">roads</span>.<span class="ident">insert</span>(<span class="kw-2">*</span><span class="ident">id</span>);

            <span class="ident">m</span>.<span class="ident">roads</span>.<span class="ident">insert</span>(<span class="kw-2">*</span><span class="ident">id</span>, <span class="ident">Road</span>::<span class="ident">new</span>(<span class="kw-2">*</span><span class="ident">id</span>, <span class="ident">r</span>, <span class="kw-2">&amp;</span><span class="ident">raw</span>.<span class="ident">config</span>));
        }

        <span class="ident">timer</span>.<span class="ident">start_iter</span>(<span class="string">&quot;find each intersection polygon&quot;</span>, <span class="ident">m</span>.<span class="ident">intersections</span>.<span class="ident">len</span>());
        <span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="ident">m</span>.<span class="ident">intersections</span>.<span class="ident">values_mut</span>() {
            <span class="ident">timer</span>.<span class="ident">next</span>();
            <span class="kw">match</span> <span class="ident">intersection_polygon</span>(<span class="ident">i</span>, <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">m</span>.<span class="ident">roads</span>, <span class="ident">timer</span>) {
                <span class="prelude-val">Ok</span>((<span class="ident">poly</span>, <span class="kw">_</span>)) <span class="op">=&gt;</span> {
                    <span class="ident">i</span>.<span class="ident">polygon</span> <span class="op">=</span> <span class="ident">poly</span>;
                }
                <span class="prelude-val">Err</span>(<span class="ident">err</span>) <span class="op">=&gt;</span> {
                    <span class="ident">timer</span>.<span class="ident">error</span>(<span class="macro">format</span><span class="macro">!</span>(
                        <span class="string">&quot;Can&#39;t make intersection geometry for {}: {}&quot;</span>,
                        <span class="ident">i</span>.<span class="ident">id</span>, <span class="ident">err</span>
                    ));

                    <span class="comment">// Don&#39;t trim lines back at all</span>
                    <span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="ident">m</span>.<span class="ident">roads</span>[<span class="ident">i</span>.<span class="ident">roads</span>.<span class="ident">iter</span>().<span class="ident">next</span>().<span class="ident">unwrap</span>()];
                    <span class="kw">let</span> <span class="ident">pt</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">r</span>.<span class="ident">src_i</span> <span class="op">==</span> <span class="ident">i</span>.<span class="ident">id</span> {
                        <span class="ident">r</span>.<span class="ident">trimmed_center_pts</span>.<span class="ident">first_pt</span>()
                    } <span class="kw">else</span> {
                        <span class="ident">r</span>.<span class="ident">trimmed_center_pts</span>.<span class="ident">last_pt</span>()
                    };
                    <span class="ident">i</span>.<span class="ident">polygon</span> <span class="op">=</span> <span class="ident">Circle</span>::<span class="ident">new</span>(<span class="ident">pt</span>, <span class="ident">Distance</span>::<span class="ident">meters</span>(<span class="number">3.0</span>)).<span class="ident">to_polygon</span>();

                    <span class="comment">// Also don&#39;t attempt to make Movements later!</span>
                    <span class="ident">i</span>.<span class="ident">intersection_type</span> <span class="op">=</span> <span class="ident">IntersectionType</span>::<span class="ident">StopSign</span>;
                }
            }
        }

        <span class="comment">// Some roads near borders get completely squished. Stretch them out here. Attempting to do</span>
        <span class="comment">// this in the convert_osm layer doesn&#39;t work, because predicting how much roads will be</span>
        <span class="comment">// trimmed is impossible.</span>
        <span class="kw">let</span> <span class="ident">min_len</span> <span class="op">=</span> <span class="ident">Distance</span>::<span class="ident">meters</span>(<span class="number">5.0</span>);
        <span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="ident">m</span>.<span class="ident">intersections</span>.<span class="ident">values_mut</span>() {
            <span class="kw">if</span> <span class="ident">i</span>.<span class="ident">intersection_type</span> <span class="op">!=</span> <span class="ident">IntersectionType</span>::<span class="ident">Border</span> {
                <span class="kw">continue</span>;
            }
            <span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">m</span>.<span class="ident">roads</span>.<span class="ident">get_mut</span>(<span class="ident">i</span>.<span class="ident">roads</span>.<span class="ident">iter</span>().<span class="ident">next</span>().<span class="ident">unwrap</span>()).<span class="ident">unwrap</span>();
            <span class="kw">if</span> <span class="ident">r</span>.<span class="ident">trimmed_center_pts</span>.<span class="ident">length</span>() <span class="op">&gt;=</span> <span class="ident">min_len</span> {
                <span class="kw">continue</span>;
            }
            <span class="kw">if</span> <span class="ident">r</span>.<span class="ident">dst_i</span> <span class="op">==</span> <span class="ident">i</span>.<span class="ident">id</span> {
                <span class="ident">r</span>.<span class="ident">trimmed_center_pts</span> <span class="op">=</span> <span class="ident">r</span>.<span class="ident">trimmed_center_pts</span>.<span class="ident">extend_to_length</span>(<span class="ident">min_len</span>);
            } <span class="kw">else</span> {
                <span class="ident">r</span>.<span class="ident">trimmed_center_pts</span> <span class="op">=</span> <span class="ident">r</span>
                    .<span class="ident">trimmed_center_pts</span>
                    .<span class="ident">reversed</span>()
                    .<span class="ident">extend_to_length</span>(<span class="ident">min_len</span>)
                    .<span class="ident">reversed</span>();
            }
            <span class="ident">i</span>.<span class="ident">polygon</span> <span class="op">=</span> <span class="ident">intersection_polygon</span>(<span class="ident">i</span>, <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">m</span>.<span class="ident">roads</span>, <span class="ident">timer</span>).<span class="ident">unwrap</span>().<span class="number">0</span>;
            <span class="ident">timer</span>.<span class="ident">note</span>(<span class="macro">format</span><span class="macro">!</span>(
                <span class="string">&quot;Shifted border {} out a bit to make the road a reasonable length&quot;</span>,
                <span class="ident">i</span>.<span class="ident">id</span>
            ));
        }

        <span class="ident">m</span>
    }
}
</pre></div>
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