<!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 to the Rust file `geom/src/ring.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>ring.rs.html -- 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="../../dark.css"><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script src="../../storage.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="shortcut icon" href="../../favicon.ico"><style type="text/css">#crate-search{background-image:url("../../down-arrow.svg");}</style></head><body class="rustdoc source"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><a href='../../geom/index.html'><div class='logo-container'><img src='../../rust-logo.png' alt='logo'></div></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../theme.js"></script><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" disabled autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><a id="settings-menu" href="../../settings.html"><img src="../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><pre class="line-numbers"><span id="1"> 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id="159">159</span> <span id="160">160</span> <span id="161">161</span> </pre><div class="example-wrap"><pre class="rust "> <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::<span class="ident">HashSet</span>; <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">fmt</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">Distance</span>, <span class="ident">Line</span>, <span class="ident">PolyLine</span>, <span class="ident">Polygon</span>, <span class="ident">Pt2D</span>}; <span class="comment">// Maybe a misnomer, but like a PolyLine, but closed.</span> <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Debug</span>, <span class="ident">PartialEq</span>, <span class="ident">Serialize</span>, <span class="ident">Deserialize</span>)]</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Ring</span> { <span class="comment">// first equals last</span> <span class="ident">pts</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">Pt2D</span><span class="op">></span>, } <span class="kw">impl</span> <span class="ident">Ring</span> { <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">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="prelude-ty">Result</span><span class="op"><</span><span class="ident">Ring</span>, <span class="ident">String</span><span class="op">></span> { <span class="kw">if</span> <span class="ident">pts</span>.<span class="ident">len</span>() <span class="op"><</span> <span class="number">3</span> { <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">"Can't make a ring with < 3 points"</span>)); } <span class="kw">if</span> <span class="ident">pts</span>[<span class="number">0</span>] <span class="op">!</span><span class="op">=</span> <span class="kw-2">*</span><span class="ident">pts</span>.<span class="ident">last</span>().<span class="ident">unwrap</span>() { <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="macro">format</span><span class="macro">!</span>( <span class="string">"Can't make a ring with mismatching first/last points"</span> )); } <span class="kw">if</span> <span class="ident">pts</span>.<span class="ident">windows</span>(<span class="number">2</span>).<span class="ident">any</span>(<span class="op">|</span><span class="ident">pair</span><span class="op">|</span> <span class="ident">pair</span>[<span class="number">0</span>] <span class="op">=</span><span class="op">=</span> <span class="ident">pair</span>[<span class="number">1</span>]) { <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">"Ring has ~dupe adjacent pts"</span>)); } <span class="kw">let</span> <span class="ident">result</span> <span class="op">=</span> <span class="ident">Ring</span> { <span class="ident">pts</span> }; <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">seen_pts</span> <span class="op">=</span> <span class="ident">HashSet</span>::<span class="ident">new</span>(); <span class="kw">for</span> <span class="ident">pt</span> <span class="kw">in</span> <span class="ident">result</span>.<span class="ident">pts</span>.<span class="ident">iter</span>().<span class="ident">skip</span>(<span class="number">1</span>) { <span class="ident">seen_pts</span>.<span class="ident">insert</span>(<span class="ident">pt</span>.<span class="ident">to_hashable</span>()); } <span class="kw">if</span> <span class="ident">seen_pts</span>.<span class="ident">len</span>() <span class="op">!</span><span class="op">=</span> <span class="ident">result</span>.<span class="ident">pts</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="number">1</span> { <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">"Ring has repeat non-adjacent points"</span>)); } <span class="prelude-val">Ok</span>(<span class="ident">result</span>) } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">must_new</span>(<span class="ident">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">Ring</span> { <span class="ident">Ring</span>::<span class="ident">new</span>(<span class="ident">pts</span>).<span class="ident">unwrap</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="ident">Polygon</span> { <span class="comment">// TODO Has a weird corner. Use the polygon offset thing instead?</span> <span class="ident">PolyLine</span>::<span class="ident">unchecked_new</span>(<span class="self">self</span>.<span class="ident">pts</span>.<span class="ident">clone</span>()).<span class="ident">make_polygons</span>(<span class="ident">thickness</span>) } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_polygon</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Polygon</span> { <span class="ident">Polygon</span>::<span class="ident">with_holes</span>(<span class="self">self</span>, <span class="ident">Vec</span>::<span class="ident">new</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-2">&</span><span class="self">self</span>.<span class="ident">pts</span> } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">into_points</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="self">self</span>.<span class="ident">pts</span> } <span class="comment">// Be careful with the order of results. Hits on an earlier line segment of other show up first,</span> <span class="comment">// but if the ring hits a line segment at multiple points, who knows. Dedupes.</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">all_intersections</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">PolyLine</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">let</span> <span class="kw-2">mut</span> <span class="ident">hits</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>(); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">seen</span> <span class="op">=</span> <span class="ident">HashSet</span>::<span class="ident">new</span>(); <span class="kw">for</span> <span class="ident">l1</span> <span class="kw">in</span> <span class="ident">other</span>.<span class="ident">lines</span>() { <span class="kw">for</span> <span class="ident">l2</span> <span class="kw">in</span> <span class="self">self</span> .<span class="ident">pts</span> .<span class="ident">windows</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">Line</span>::<span class="ident">must_new</span>(<span class="ident">pair</span>[<span class="number">0</span>], <span class="ident">pair</span>[<span class="number">1</span>])) { <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">pt</span>) <span class="op">=</span> <span class="ident">l1</span>.<span class="ident">intersection</span>(<span class="kw-2">&</span><span class="ident">l2</span>) { <span class="kw">if</span> <span class="op">!</span><span class="ident">seen</span>.<span class="ident">contains</span>(<span class="kw-2">&</span><span class="ident">pt</span>.<span class="ident">to_hashable</span>()) { <span class="ident">hits</span>.<span class="ident">push</span>(<span class="ident">pt</span>); <span class="ident">seen</span>.<span class="ident">insert</span>(<span class="ident">pt</span>.<span class="ident">to_hashable</span>()); } } } } <span class="ident">hits</span> } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_both_slices_btwn</span>(<span class="kw-2">&</span><span class="self">self</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">PolyLine</span>, <span class="ident">PolyLine</span>)<span class="op">></span> { <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">pt1</span> <span class="op">!</span><span class="op">=</span> <span class="ident">pt2</span>); <span class="kw">let</span> <span class="ident">pl</span> <span class="op">=</span> <span class="ident">PolyLine</span>::<span class="ident">unchecked_new</span>(<span class="self">self</span>.<span class="ident">pts</span>.<span class="ident">clone</span>()); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">dist1</span> <span class="op">=</span> <span class="ident">pl</span>.<span class="ident">dist_along_of_point</span>(<span class="ident">pt1</span>).<span class="ident">unwrap</span>().<span class="number">0</span>; <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">dist2</span> <span class="op">=</span> <span class="ident">pl</span>.<span class="ident">dist_along_of_point</span>(<span class="ident">pt2</span>).<span class="ident">unwrap</span>().<span class="number">0</span>; <span class="kw">if</span> <span class="ident">dist1</span> <span class="op">></span> <span class="ident">dist2</span> { <span class="ident">std</span>::<span class="ident">mem</span>::<span class="ident">swap</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">dist1</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">dist2</span>); } <span class="kw">if</span> <span class="ident">dist1</span> <span class="op">=</span><span class="op">=</span> <span class="ident">dist2</span> { <span class="kw">return</span> <span class="prelude-val">None</span>; } <span class="kw">let</span> <span class="ident">candidate1</span> <span class="op">=</span> <span class="ident">pl</span>.<span class="ident">maybe_exact_slice</span>(<span class="ident">dist1</span>, <span class="ident">dist2</span>).<span class="ident">ok</span>()<span class="question-mark">?</span>; <span class="kw">let</span> <span class="ident">candidate2</span> <span class="op">=</span> <span class="ident">pl</span> .<span class="ident">maybe_exact_slice</span>(<span class="ident">dist2</span>, <span class="ident">pl</span>.<span class="ident">length</span>()) .<span class="ident">ok</span>()<span class="question-mark">?</span> .<span class="ident">must_extend</span>(<span class="ident">pl</span>.<span class="ident">maybe_exact_slice</span>(<span class="ident">Distance</span>::<span class="ident">ZERO</span>, <span class="ident">dist1</span>).<span class="ident">ok</span>()<span class="question-mark">?</span>); <span class="prelude-val">Some</span>((<span class="ident">candidate1</span>, <span class="ident">candidate2</span>)) } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_shorter_slice_btwn</span>(<span class="kw-2">&</span><span class="self">self</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="ident">PolyLine</span> { <span class="kw">let</span> (<span class="ident">candidate1</span>, <span class="ident">candidate2</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">get_both_slices_btwn</span>(<span class="ident">pt1</span>, <span class="ident">pt2</span>).<span class="ident">unwrap</span>(); <span class="kw">if</span> <span class="ident">candidate1</span>.<span class="ident">length</span>() <span class="op"><</span> <span class="ident">candidate2</span>.<span class="ident">length</span>() { <span class="ident">candidate1</span> } <span class="kw">else</span> { <span class="ident">candidate2</span> } } <span class="comment">// Extract all PolyLines and Rings. Doesn't handle crazy double loops and stuff.</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">split_points</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="prelude-ty">Result</span><span class="op"><</span>(<span class="ident">Vec</span><span class="op"><</span><span class="ident">PolyLine</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="ident">String</span><span class="op">></span> { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">seen</span> <span class="op">=</span> <span class="ident">HashSet</span>::<span class="ident">new</span>(); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">intersections</span> <span class="op">=</span> <span class="ident">HashSet</span>::<span class="ident">new</span>(); <span class="kw">for</span> <span class="ident">pt</span> <span class="kw">in</span> <span class="ident">pts</span> { <span class="kw">let</span> <span class="ident">pt</span> <span class="op">=</span> <span class="ident">pt</span>.<span class="ident">to_hashable</span>(); <span class="kw">if</span> <span class="ident">seen</span>.<span class="ident">contains</span>(<span class="kw-2">&</span><span class="ident">pt</span>) { <span class="ident">intersections</span>.<span class="ident">insert</span>(<span class="ident">pt</span>); } <span class="kw">else</span> { <span class="ident">seen</span>.<span class="ident">insert</span>(<span class="ident">pt</span>); } } <span class="ident">intersections</span>.<span class="ident">insert</span>(<span class="ident">pts</span>[<span class="number">0</span>].<span class="ident">to_hashable</span>()); <span class="ident">intersections</span>.<span class="ident">insert</span>(<span class="ident">pts</span>.<span class="ident">last</span>().<span class="ident">unwrap</span>().<span class="ident">to_hashable</span>()); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">polylines</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>(); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rings</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>(); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">current</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="ident">pts</span>.<span class="ident">iter</span>().<span class="ident">cloned</span>() { <span class="ident">current</span>.<span class="ident">push</span>(<span class="ident">pt</span>); <span class="kw">if</span> <span class="ident">intersections</span>.<span class="ident">contains</span>(<span class="kw-2">&</span><span class="ident">pt</span>.<span class="ident">to_hashable</span>()) <span class="kw-2">&</span><span class="op">&</span> <span class="ident">current</span>.<span class="ident">len</span>() <span class="op">></span> <span class="number">1</span> { <span class="kw">if</span> <span class="ident">current</span>[<span class="number">0</span>] <span class="op">=</span><span class="op">=</span> <span class="ident">pt</span> <span class="kw-2">&</span><span class="op">&</span> <span class="ident">current</span>.<span class="ident">len</span>() <span class="op">></span><span class="op">=</span> <span class="number">3</span> { <span class="ident">rings</span>.<span class="ident">push</span>(<span class="ident">Ring</span>::<span class="ident">must_new</span>(<span class="ident">current</span>.<span class="ident">drain</span>(..).<span class="ident">collect</span>())); } <span class="kw">else</span> { <span class="ident">polylines</span>.<span class="ident">push</span>(<span class="ident">PolyLine</span>::<span class="ident">new</span>(<span class="ident">current</span>.<span class="ident">drain</span>(..).<span class="ident">collect</span>())<span class="question-mark">?</span>); } <span class="ident">current</span>.<span class="ident">push</span>(<span class="ident">pt</span>); } } <span class="prelude-val">Ok</span>((<span class="ident">polylines</span>, <span class="ident">rings</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="ident">PolyLine</span>::<span class="ident">unchecked_new</span>(<span class="self">self</span>.<span class="ident">pts</span>.<span class="ident">clone</span>()) .<span class="ident">dist_along_of_point</span>(<span class="ident">pt</span>) .<span class="ident">is_some</span>() } } <span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Display</span> <span class="kw">for</span> <span class="ident">Ring</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">"Ring::new(vec!["</span>)<span class="question-mark">?</span>; <span class="kw">for</span> <span class="ident">pt</span> <span class="kw">in</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">pts</span> { <span class="macro">writeln</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">" Pt2D::new({}, {}),"</span>, <span class="ident">pt</span>.<span class="ident">x</span>(), <span class="ident">pt</span>.<span class="ident">y</span>())<span class="question-mark">?</span>; } <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"])"</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>