<!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/circle.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>circle.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><script src="../../crates.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" href="../../favicon-16x16.png"> <link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><style type="text/css">#crate-search{background-image:url("../../down-arrow.svg");}</style></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu" role="button">☰</div><a href='../../geom/index.html'><div class='logo-container rust-logo'><img src='../../rust-logo.png' alt='logo'></div></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu" title="themes"><img src="../../brush.svg" width="18" height="18" alt="Pick another theme!"></button><div id="theme-choices" role="menu"></div></div><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><button type="button" id="help-button" title="help">?</button><a id="settings-menu" href="../../settings.html" title="settings"><img src="../../wheel.svg" width="18" height="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><div class="example-wrap"><pre class="line-numbers"><span id="1"> 1</span> <span id="2"> 2</span> <span id="3"> 3</span> <span id="4"> 4</span> <span id="5"> 5</span> <span id="6"> 6</span> <span id="7"> 7</span> <span id="8"> 8</span> <span id="9"> 9</span> <span id="10"> 10</span> <span id="11"> 11</span> <span id="12"> 12</span> <span id="13"> 13</span> <span id="14"> 14</span> <span id="15"> 15</span> <span id="16"> 16</span> <span id="17"> 17</span> <span id="18"> 18</span> <span id="19"> 19</span> <span id="20"> 20</span> <span id="21"> 21</span> <span id="22"> 22</span> <span id="23"> 23</span> <span id="24"> 24</span> <span id="25"> 25</span> <span id="26"> 26</span> <span id="27"> 27</span> <span id="28"> 28</span> <span id="29"> 29</span> <span id="30"> 30</span> <span id="31"> 31</span> <span id="32"> 32</span> <span id="33"> 33</span> <span id="34"> 34</span> <span id="35"> 35</span> <span id="36"> 36</span> <span id="37"> 37</span> <span id="38"> 38</span> <span id="39"> 39</span> <span id="40"> 40</span> <span id="41"> 41</span> <span id="42"> 42</span> <span id="43"> 43</span> <span id="44"> 44</span> <span id="45"> 45</span> <span id="46"> 46</span> <span id="47"> 47</span> <span id="48"> 48</span> <span id="49"> 49</span> <span id="50"> 50</span> <span id="51"> 51</span> <span id="52"> 52</span> <span id="53"> 53</span> <span id="54"> 54</span> <span id="55"> 55</span> <span id="56"> 56</span> <span id="57"> 57</span> <span id="58"> 58</span> <span id="59"> 59</span> <span id="60"> 60</span> <span id="61"> 61</span> <span id="62"> 62</span> <span id="63"> 63</span> <span id="64"> 64</span> <span id="65"> 65</span> <span id="66"> 66</span> <span id="67"> 67</span> <span id="68"> 68</span> <span id="69"> 69</span> <span id="70"> 70</span> <span id="71"> 71</span> <span id="72"> 72</span> <span id="73"> 73</span> <span id="74"> 74</span> <span id="75"> 75</span> <span id="76"> 76</span> <span id="77"> 77</span> <span id="78"> 78</span> <span id="79"> 79</span> <span id="80"> 80</span> <span id="81"> 81</span> <span id="82"> 82</span> <span id="83"> 83</span> <span id="84"> 84</span> <span id="85"> 85</span> <span id="86"> 86</span> <span id="87"> 87</span> <span id="88"> 88</span> <span id="89"> 89</span> <span id="90"> 90</span> <span id="91"> 91</span> <span id="92"> 92</span> <span id="93"> 93</span> <span id="94"> 94</span> <span id="95"> 95</span> <span id="96"> 96</span> <span id="97"> 97</span> <span id="98"> 98</span> <span id="99"> 99</span> <span id="100">100</span> <span id="101">101</span> <span id="102">102</span> <span id="103">103</span> <span id="104">104</span> <span id="105">105</span> <span id="106">106</span> </pre><pre class="rust"> <span class="kw">use</span> <span class="ident">std::fmt</span>; <span class="kw">use</span> <span class="ident">anyhow::Result</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">Polygon</span>, <span class="ident">Pt2D</span>, <span class="ident">Ring</span>}; <span class="kw">const</span> <span class="ident">TRIANGLES_PER_CIRCLE</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">60</span>; <span class="doccomment">/// A circle, defined by a center and radius.</span> <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Serialize</span>, <span class="ident">Deserialize</span>, <span class="ident">Debug</span>, <span class="ident">Clone</span>)]</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Circle</span> { <span class="kw">pub</span> <span class="ident">center</span>: <span class="ident">Pt2D</span>, <span class="kw">pub</span> <span class="ident">radius</span>: <span class="ident">Distance</span>, } <span class="kw">impl</span> <span class="ident">Circle</span> { <span class="doccomment">/// Creates a circle.</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">center</span>: <span class="ident">Pt2D</span>, <span class="ident">radius</span>: <span class="ident">Distance</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Circle</span> { <span class="ident">Circle</span> { <span class="ident">center</span>, <span class="ident">radius</span> } } <span class="doccomment">/// True if the point is inside the circle.</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="comment">// avoid sqrt by squaring radius instead</span> (<span class="ident">pt</span>.<span class="ident">x</span>() <span class="op">-</span> <span class="self">self</span>.<span class="ident">center</span>.<span class="ident">x</span>()).<span class="ident">powi</span>(<span class="number">2</span>) <span class="op">+</span> (<span class="ident">pt</span>.<span class="ident">y</span>() <span class="op">-</span> <span class="self">self</span>.<span class="ident">center</span>.<span class="ident">y</span>()).<span class="ident">powi</span>(<span class="number">2</span>) <span class="op"><</span> <span class="self">self</span>.<span class="ident">radius</span>.<span class="ident">inner_meters</span>().<span class="ident">powi</span>(<span class="number">2</span>) } <span class="doccomment">/// Get the boundary containing this circle.</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">min_x</span>: <span class="self">self</span>.<span class="ident">center</span>.<span class="ident">x</span>() <span class="op">-</span> <span class="self">self</span>.<span class="ident">radius</span>.<span class="ident">inner_meters</span>(), <span class="ident">max_x</span>: <span class="self">self</span>.<span class="ident">center</span>.<span class="ident">x</span>() <span class="op">+</span> <span class="self">self</span>.<span class="ident">radius</span>.<span class="ident">inner_meters</span>(), <span class="ident">min_y</span>: <span class="self">self</span>.<span class="ident">center</span>.<span class="ident">y</span>() <span class="op">-</span> <span class="self">self</span>.<span class="ident">radius</span>.<span class="ident">inner_meters</span>(), <span class="ident">max_y</span>: <span class="self">self</span>.<span class="ident">center</span>.<span class="ident">y</span>() <span class="op">+</span> <span class="self">self</span>.<span class="ident">radius</span>.<span class="ident">inner_meters</span>(), } } <span class="doccomment">/// Renders the circle as a polygon.</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_polygon</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="self">self</span>.<span class="ident">to_ring</span>().<span class="ident">into_polygon</span>() } <span class="doccomment">/// Renders some percent, between [0, 1], of the circle as a polygon. The polygon starts from 0</span> <span class="doccomment">/// degrees. Be warned the resulting polygon doesn't have a ring as its boundary!</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_partial_polygon</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">percent_full</span>: <span class="ident">f64</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Polygon</span> { <span class="attribute">#![<span class="ident">allow</span>(<span class="ident">clippy::float_cmp</span>)]</span> <span class="macro">assert!</span>((<span class="number">0.</span> ..<span class="op">=</span><span class="number">1.</span>).<span class="ident">contains</span>(<span class="kw-2">&</span><span class="ident">percent_full</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="self">self</span>.<span class="ident">center</span>]; <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">indices</span> <span class="op">=</span> <span class="ident">Vec::new</span>(); <span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">TRIANGLES_PER_CIRCLE</span> { <span class="ident">pts</span>.<span class="ident">push</span>(<span class="self">self</span>.<span class="ident">center</span>.<span class="ident">project_away</span>( <span class="self">self</span>.<span class="ident">radius</span>, <span class="ident">Angle::degrees</span>((<span class="ident">i</span> <span class="kw">as</span> <span class="ident">f64</span>) <span class="op">/</span> (<span class="ident">TRIANGLES_PER_CIRCLE</span> <span class="kw">as</span> <span class="ident">f64</span>) <span class="op">*</span> <span class="ident">percent_full</span> <span class="op">*</span> <span class="number">360.0</span>), )); <span class="ident">indices</span>.<span class="ident">push</span>(<span class="number">0</span>); <span class="ident">indices</span>.<span class="ident">push</span>(<span class="ident">i</span> <span class="op">+</span> <span class="number">1</span>); <span class="kw">if</span> <span class="ident">i</span> <span class="op">!</span><span class="op">=</span> <span class="ident">TRIANGLES_PER_CIRCLE</span> <span class="op">-</span> <span class="number">1</span> { <span class="ident">indices</span>.<span class="ident">push</span>(<span class="ident">i</span> <span class="op">+</span> <span class="number">2</span>); } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">percent_full</span> <span class="op">=</span><span class="op">=</span> <span class="number">1.0</span> { <span class="ident">indices</span>.<span class="ident">push</span>(<span class="number">1</span>); } <span class="kw">else</span> { <span class="ident">indices</span>.<span class="ident">pop</span>(); <span class="ident">indices</span>.<span class="ident">pop</span>(); } } <span class="ident">Polygon::precomputed</span>(<span class="ident">pts</span>, <span class="ident">indices</span>) } <span class="doccomment">/// Returns the ring around the circle.</span> <span class="kw">fn</span> <span class="ident">to_ring</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Ring</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">Pt2D</span><span class="op">></span> <span class="op">=</span> (<span class="number">0</span>..<span class="op">=</span><span class="ident">TRIANGLES_PER_CIRCLE</span>) .<span class="ident">map</span>(<span class="op">|</span><span class="ident">i</span><span class="op">|</span> { <span class="self">self</span>.<span class="ident">center</span>.<span class="ident">project_away</span>( <span class="self">self</span>.<span class="ident">radius</span>, <span class="ident">Angle::degrees</span>((<span class="ident">i</span> <span class="kw">as</span> <span class="ident">f64</span>) <span class="op">/</span> (<span class="ident">TRIANGLES_PER_CIRCLE</span> <span class="kw">as</span> <span class="ident">f64</span>) <span class="op">*</span> <span class="number">360.0</span>), ) }) .<span class="ident">collect</span>(); <span class="comment">// With some radii, we get duplicate adjacent points</span> <span class="ident">pts</span>.<span class="ident">dedup</span>(); <span class="ident">Ring::must_new</span>(<span class="ident">pts</span>) } <span class="doccomment">/// Creates an outline around the circle, strictly contained with the circle's original radius.</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="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">radius</span> <span class="op"><</span><span class="op">=</span> <span class="ident">thickness</span> { <span class="macro">bail!</span>( <span class="string">"Can't make Circle outline with radius {} and thickness {}"</span>, <span class="self">self</span>.<span class="ident">radius</span>, <span class="ident">thickness</span> ); } <span class="kw">let</span> <span class="ident">bigger</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">to_ring</span>(); <span class="kw">let</span> <span class="ident">smaller</span> <span class="op">=</span> <span class="ident">Circle::new</span>(<span class="self">self</span>.<span class="ident">center</span>, <span class="self">self</span>.<span class="ident">radius</span> <span class="op">-</span> <span class="ident">thickness</span>).<span class="ident">to_ring</span>(); <span class="prelude-val">Ok</span>(<span class="ident">Polygon::with_holes</span>(<span class="ident">bigger</span>, <span class="macro">vec!</span>[<span class="ident">smaller</span>])) } } <span class="kw">impl</span> <span class="ident">fmt::Display</span> <span class="kw">for</span> <span class="ident">Circle</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::Formatter</span>) <span class="op">-</span><span class="op">></span> <span class="ident">fmt::Result</span> { <span class="macro">write!</span>(<span class="ident">f</span>, <span class="string">"Circle({}, {})"</span>, <span class="self">self</span>.<span class="ident">center</span>, <span class="self">self</span>.<span class="ident">radius</span>) } } </pre></div> </section><section id="search" class="content hidden"></section><div id="rustdoc-vars" data-root-path="../../" data-current-crate="geom" data-search-index-js="../../search-index.js" data-search-js="../../search.js"></div><script src="../../main.js"></script><script src="../../source-script.js"></script><script src="../../source-files.js"></script></body></html>