<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `geom/src/polygon.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>polygon.rs - source</title><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled ><script id="default-settings"></script><script src="../../storage.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../../favicon.svg"> <link rel="alternate icon" type="image/png" 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id="562">562</span> <span id="563">563</span> <span id="564">564</span> <span id="565">565</span> <span id="566">566</span> <span id="567">567</span> <span id="568">568</span> <span id="569">569</span> </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"><</span><span class="ident">Pt2D</span><span class="op">></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"><</span><span class="ident">u16</span><span class="op">></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"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">Ring</span><span class="op">></span><span class="op">></span>, } <span class="kw">impl</span> <span class="ident">Polygon</span> { <span class="comment">// TODO Last result when we've got something that isn'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"><</span><span class="ident">Pt2D</span><span class="op">></span>) <span class="op">-</span><span class="op">></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">></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">&</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">&</span><span class="ident">vertices</span>, <span class="kw-2">&</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"><</span><span class="ident">Ring</span><span class="op">></span>) <span class="op">-</span><span class="op">></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"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">f64</span><span class="op">></span><span class="op">></span><span class="op">></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">&</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">&</span><span class="ident">vertices</span>, <span class="kw-2">&</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'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">&</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">f64</span><span class="op">></span><span class="op">></span><span class="op">></span>) <span class="op">-</span><span class="op">></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">&</span><span class="ident">vertices</span>, <span class="kw-2">&</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->lyon parsing,</span> <span class="comment">// and it'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"><</span><span class="ident">Pt2D</span><span class="op">></span>, <span class="ident">indices</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>) <span class="op">-</span><span class="op">></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">&</span><span class="ident">Triangle</span>) <span class="op">-</span><span class="op">></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">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">Triangle</span><span class="op">></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"><</span><span class="ident">Triangle</span><span class="op">></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">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> (<span class="kw-2">&</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">Pt2D</span><span class="op">></span>, <span class="kw-2">&</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">u16</span><span class="op">></span>) { (<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">points</span>, <span class="kw-2">&</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">&</span><span class="self">self</span>, <span class="ident">pt</span>: <span class="ident">Pt2D</span>) <span class="op">-</span><span class="op">></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">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Bounds</span> { <span class="ident">Bounds</span>::<span class="ident">from</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">points</span>) } <span class="kw">fn</span> <span class="ident">transform</span><span class="op"><</span><span class="ident">F</span>: <span class="ident">Fn</span>(<span class="kw-2">&</span><span class="ident">Pt2D</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Pt2D</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-</span><span class="op">></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">&</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">&</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">&</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">></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">&</span><span class="self">self</span>, <span class="ident">factor</span>: <span class="ident">f64</span>) <span class="op">-</span><span class="op">></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">&</span><span class="self">self</span>, <span class="ident">angle</span>: <span class="ident">Angle</span>) <span class="op">-</span><span class="op">></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">&</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">></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">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">Pt2D</span><span class="op">></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">&</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">></span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">Pt2D</span><span class="op">></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">></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">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></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"><</span><span class="ident">HashablePt2D</span><span class="op">></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">&</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'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">></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">></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">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Polygon</span><span class="op">></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"><</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"><</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'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"><</span><span class="ident">f64</span><span class="op">></span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Polygon</span><span class="op">></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">></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">></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'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"><</span><span class="ident">f64</span><span class="op">></span>) <span class="op">-</span><span class="op">></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'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">></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"><</span><span class="ident">Polygon</span><span class="op">></span>) <span class="op">-</span><span class="op">></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'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">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">Polygon</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">Polygon</span><span class="op">></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">&</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"><</span><span class="ident">Polygon</span><span class="op">></span>) <span class="op">-</span><span class="op">></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"><</span><span class="ident">f64</span><span class="op">></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"><</span><span class="ident">Polygon</span><span class="op">></span>, <span class="ident">concavity</span>: <span class="ident">f64</span>) <span class="op">-</span><span class="op">></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"><</span><span class="ident">f64</span><span class="op">></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">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></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">&</span><span class="ident">to_geo</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">points</span>()), <span class="kw-2">&</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're formed from rings. Those made from</span> <span class="doccomment">/// PolyLines won'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">&</span><span class="self">self</span>, <span class="ident">thickness</span>: <span class="ident">Distance</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Polygon</span>, <span class="ident">String</span><span class="op">></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'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">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></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">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></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">&</span><span class="self">self</span>.<span class="ident">points</span>()).<span class="ident">unsigned_area</span>() } <span class="doccomment">/// Doesn'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">&</span><span class="self">self</span>, <span class="ident">input</span>: <span class="kw-2">&</span><span class="ident">PolyLine</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">Pt2D</span><span class="op">></span><span class="op">></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">&</span><span class="self">self</span>, <span class="ident">input</span>: <span class="kw-2">&</span><span class="ident">Ring</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">Pt2D</span><span class="op">></span><span class="op">></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">&</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't be in the</span> <span class="comment">// polygon itself, but they'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">&</span><span class="self">self</span>, <span class="ident">gps</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">GPSBounds</span><span class="op">></span>) <span class="op">-</span><span class="op">></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">&</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">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-</span><span class="op">></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">"Polygon with {} points and {} indices"</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">" {}: {}"</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">"Indices: ["</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">"({}, {}, {}), "</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">"]"</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">></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">&</span><span class="self">self</span>, <span class="ident">pt</span>: <span class="ident">Pt2D</span>) <span class="op">-</span><span class="op">></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">&</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">></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"><</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">&</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">Pt2D</span><span class="op">></span>) <span class="op">-</span><span class="op">></span> <span class="ident">geo</span>::<span class="ident">Polygon</span><span class="op"><</span><span class="ident">f64</span><span class="op">></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"><</span><span class="ident">Vec</span><span class="op"><</span><span class="kw">_</span><span class="op">></span><span class="op">></span>(), ), <span class="ident">Vec</span>::<span class="ident">new</span>(), ) } <span class="kw">impl</span> <span class="ident">From</span><span class="op"><</span><span class="ident">geo</span>::<span class="ident">Polygon</span><span class="op"><</span><span class="ident">f64</span><span class="op">></span><span class="op">></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"><</span><span class="ident">f64</span><span class="op">></span>) <span class="op">-</span><span class="op">></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"><</span><span class="ident">Polygon</span><span class="op">></span> <span class="kw">for</span> <span class="ident">geo</span>::<span class="ident">Polygon</span><span class="op"><</span><span class="ident">f64</span><span class="op">></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">></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">"expected poly.rings[0] to be exterior"</span>); <span class="kw">let</span> <span class="ident">interiors</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">geo</span>::<span class="ident">LineString</span><span class="op"><</span><span class="ident">f64</span><span class="op">></span><span class="op">></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"><</span><span class="ident">Vec</span><span class="op"><</span><span class="kw">_</span><span class="op">></span><span class="op">></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"><</span><span class="ident">f64</span><span class="op">></span>) <span class="op">-</span><span class="op">></span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">Polygon</span><span class="op">></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"><</span><span class="ident">usize</span><span class="op">></span>) <span class="op">-</span><span class="op">></span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">u16</span><span class="op">></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">"{} can't fit in u16, some polygon is too huge"</span>, <span class="ident">x</span>); } } <span class="ident">output</span> } </pre></div> </section><section id="search" class="content hidden"></section><section class="footer"></section><script>window.rootPath = "../../";window.currentCrate = "geom";</script><script src="../../main.js"></script><script src="../../source-script.js"></script><script src="../../source-files.js"></script><script defer src="../../search-index.js"></script></body></html>