<!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 `widgetry/src/color.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>color.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><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="../../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../../dark.css" disabled><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script src="../../crates.js"></script><script defer src="../../main.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script>
    <noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></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="mobile-topbar"><button class="sidebar-menu-toggle">&#9776;</button><a class="sidebar-logo" href="../../widgetry/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div>
        </a><h2 class="location"></h2>
    </nav>
    <nav class="sidebar"><a class="sidebar-logo" href="../../widgetry/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div>
        </a></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../../widgetry/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><nav class="sub"><div class="theme-picker hidden"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu" title="themes"><img width="22" height="22" alt="Pick another theme!" src="../../brush.svg"></button><div id="theme-choices" role="menu"></div></div><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><button type="button" id="help-button" title="help">?</button><a id="settings-menu" href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></form></nav></div><section id="main-content" 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>
<span id="107">107</span>
<span id="108">108</span>
<span id="109">109</span>
<span id="110">110</span>
<span id="111">111</span>
<span id="112">112</span>
<span id="113">113</span>
<span id="114">114</span>
<span id="115">115</span>
<span id="116">116</span>
<span id="117">117</span>
<span id="118">118</span>
<span id="119">119</span>
<span id="120">120</span>
<span id="121">121</span>
<span id="122">122</span>
<span id="123">123</span>
<span id="124">124</span>
<span id="125">125</span>
<span id="126">126</span>
<span id="127">127</span>
<span id="128">128</span>
<span id="129">129</span>
<span id="130">130</span>
<span id="131">131</span>
<span id="132">132</span>
<span id="133">133</span>
<span id="134">134</span>
<span id="135">135</span>
<span id="136">136</span>
<span id="137">137</span>
<span id="138">138</span>
<span id="139">139</span>
<span id="140">140</span>
<span id="141">141</span>
<span id="142">142</span>
<span id="143">143</span>
<span id="144">144</span>
<span id="145">145</span>
<span id="146">146</span>
<span id="147">147</span>
<span id="148">148</span>
<span id="149">149</span>
<span id="150">150</span>
<span id="151">151</span>
<span id="152">152</span>
<span id="153">153</span>
<span id="154">154</span>
<span id="155">155</span>
<span id="156">156</span>
<span id="157">157</span>
<span id="158">158</span>
<span id="159">159</span>
<span id="160">160</span>
<span id="161">161</span>
<span id="162">162</span>
<span id="163">163</span>
<span id="164">164</span>
<span id="165">165</span>
<span id="166">166</span>
<span id="167">167</span>
<span id="168">168</span>
<span id="169">169</span>
<span id="170">170</span>
<span id="171">171</span>
<span id="172">172</span>
<span id="173">173</span>
<span id="174">174</span>
<span id="175">175</span>
<span id="176">176</span>
<span id="177">177</span>
<span id="178">178</span>
<span id="179">179</span>
<span id="180">180</span>
<span id="181">181</span>
<span id="182">182</span>
<span id="183">183</span>
<span id="184">184</span>
<span id="185">185</span>
<span id="186">186</span>
<span id="187">187</span>
<span id="188">188</span>
<span id="189">189</span>
<span id="190">190</span>
<span id="191">191</span>
<span id="192">192</span>
<span id="193">193</span>
<span id="194">194</span>
<span id="195">195</span>
<span id="196">196</span>
<span id="197">197</span>
<span id="198">198</span>
<span id="199">199</span>
<span id="200">200</span>
<span id="201">201</span>
<span id="202">202</span>
<span id="203">203</span>
<span id="204">204</span>
<span id="205">205</span>
<span id="206">206</span>
<span id="207">207</span>
<span id="208">208</span>
<span id="209">209</span>
<span id="210">210</span>
<span id="211">211</span>
<span id="212">212</span>
<span id="213">213</span>
<span id="214">214</span>
<span id="215">215</span>
<span id="216">216</span>
<span id="217">217</span>
<span id="218">218</span>
<span id="219">219</span>
<span id="220">220</span>
<span id="221">221</span>
<span id="222">222</span>
<span id="223">223</span>
<span id="224">224</span>
<span id="225">225</span>
<span id="226">226</span>
<span id="227">227</span>
<span id="228">228</span>
<span id="229">229</span>
<span id="230">230</span>
<span id="231">231</span>
<span id="232">232</span>
<span id="233">233</span>
<span id="234">234</span>
<span id="235">235</span>
<span id="236">236</span>
<span id="237">237</span>
<span id="238">238</span>
<span id="239">239</span>
<span id="240">240</span>
<span id="241">241</span>
<span id="242">242</span>
<span id="243">243</span>
<span id="244">244</span>
<span id="245">245</span>
<span id="246">246</span>
<span id="247">247</span>
<span id="248">248</span>
<span id="249">249</span>
<span id="250">250</span>
<span id="251">251</span>
<span id="252">252</span>
</pre><pre class="rust"><code><span class="kw">use</span> <span class="ident">std::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="ident">geom</span>::{<span class="ident">Line</span>, <span class="ident">Pt2D</span>};

<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Clone</span>, <span class="ident">Copy</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">Color</span> {
    <span class="kw">pub</span> <span class="ident">r</span>: <span class="ident">f32</span>,
    <span class="kw">pub</span> <span class="ident">g</span>: <span class="ident">f32</span>,
    <span class="kw">pub</span> <span class="ident">b</span>: <span class="ident">f32</span>,
    <span class="kw">pub</span> <span class="ident">a</span>: <span class="ident">f32</span>,
}

<span class="kw">impl</span> <span class="ident">fmt::Display</span> <span class="kw">for</span> <span class="ident">Color</span> {
    <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&amp;mut</span> <span class="ident">fmt::Formatter</span>) -&gt; <span class="ident">fmt::Result</span> {
        <span class="macro">write!</span>(
            <span class="ident">f</span>,
            <span class="string">&quot;Color(r={}, g={}, b={}, a={})&quot;</span>,
            <span class="self">self</span>.<span class="ident">r</span>, <span class="self">self</span>.<span class="ident">g</span>, <span class="self">self</span>.<span class="ident">b</span>, <span class="self">self</span>.<span class="ident">a</span>
        )
    }
}

<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Clone</span>, <span class="ident">PartialEq</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">Fill</span> {
    <span class="ident">Color</span>(<span class="ident">Color</span>),
    <span class="ident">LinearGradient</span>(<span class="ident">LinearGradient</span>),

    <span class="doccomment">/// Once uploaded, textures are addressed by their id, starting from 1, from left to right, top</span>
    <span class="doccomment">/// to bottom, like so:</span>
    <span class="doccomment">///</span>
    <span class="doccomment">///   ┌─┬─┬─┐</span>
    <span class="doccomment">///   │1│2│3│</span>
    <span class="doccomment">///   ├─┼─┼─┤</span>
    <span class="doccomment">///   │4│5│6│</span>
    <span class="doccomment">///   ├─┼─┼─┤</span>
    <span class="doccomment">///   │7│8│9│</span>
    <span class="doccomment">///   └─┴─┴─┘</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// Texture(0) is reserved for a pure white (no-op) texture.</span>
    <span class="ident">Texture</span>(<span class="ident">Texture</span>),

    <span class="doccomment">/// The `color` parameter is multiplied by any color baked into the texture, so typically this</span>
    <span class="doccomment">/// only makes sense for grayscale textures.</span>
    <span class="ident">ColoredTexture</span>(<span class="ident">Color</span>, <span class="ident">Texture</span>),
}

<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Copy</span>, <span class="ident">Clone</span>, <span class="ident">PartialEq</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Texture</span>(<span class="ident">u32</span>);

<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">dead_code</span>)]</span>
<span class="kw">impl</span> <span class="ident">Texture</span> {
    <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">NOOP</span>: <span class="ident">Texture</span> <span class="op">=</span> <span class="ident">Texture</span>(<span class="number">0</span>);
    <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">GRASS</span>: <span class="ident">Texture</span> <span class="op">=</span> <span class="ident">Texture</span>(<span class="number">1</span>);
    <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">STILL_WATER</span>: <span class="ident">Texture</span> <span class="op">=</span> <span class="ident">Texture</span>(<span class="number">2</span>);
    <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">RUNNING_WATER</span>: <span class="ident">Texture</span> <span class="op">=</span> <span class="ident">Texture</span>(<span class="number">3</span>);
    <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">CONCRETE</span>: <span class="ident">Texture</span> <span class="op">=</span> <span class="ident">Texture</span>(<span class="number">4</span>);
    <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">SAND</span>: <span class="ident">Texture</span> <span class="op">=</span> <span class="ident">Texture</span>(<span class="number">5</span>);
    <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">DIRT</span>: <span class="ident">Texture</span> <span class="op">=</span> <span class="ident">Texture</span>(<span class="number">6</span>);
    <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">SNOW</span>: <span class="ident">Texture</span> <span class="op">=</span> <span class="ident">Texture</span>(<span class="number">7</span>);
    <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">TREE</span>: <span class="ident">Texture</span> <span class="op">=</span> <span class="ident">Texture</span>(<span class="number">15</span>);
    <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">PINE_TREE</span>: <span class="ident">Texture</span> <span class="op">=</span> <span class="ident">Texture</span>(<span class="number">16</span>);
    <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">CACTUS</span>: <span class="ident">Texture</span> <span class="op">=</span> <span class="ident">Texture</span>(<span class="number">17</span>);
    <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">SHRUB</span>: <span class="ident">Texture</span> <span class="op">=</span> <span class="ident">Texture</span>(<span class="number">18</span>);
    <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">CROSS_HATCH</span>: <span class="ident">Texture</span> <span class="op">=</span> <span class="ident">Texture</span>(<span class="number">19</span>);
    <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">SNOW_PERSON</span>: <span class="ident">Texture</span> <span class="op">=</span> <span class="ident">Texture</span>(<span class="number">29</span>);
}

<span class="kw">impl</span> <span class="ident">Color</span> {
    <span class="comment">// TODO Won&#39;t this confuse the shader?</span>
    <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">CLEAR</span>: <span class="ident">Color</span> <span class="op">=</span> <span class="ident">Color::rgba_f</span>(<span class="number">1.0</span>, <span class="number">0.0</span>, <span class="number">0.0</span>, <span class="number">0.0</span>);
    <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">BLACK</span>: <span class="ident">Color</span> <span class="op">=</span> <span class="ident">Color::rgb_f</span>(<span class="number">0.0</span>, <span class="number">0.0</span>, <span class="number">0.0</span>);
    <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">WHITE</span>: <span class="ident">Color</span> <span class="op">=</span> <span class="ident">Color::rgb_f</span>(<span class="number">1.0</span>, <span class="number">1.0</span>, <span class="number">1.0</span>);
    <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">RED</span>: <span class="ident">Color</span> <span class="op">=</span> <span class="ident">Color::rgb_f</span>(<span class="number">1.0</span>, <span class="number">0.0</span>, <span class="number">0.0</span>);
    <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">GREEN</span>: <span class="ident">Color</span> <span class="op">=</span> <span class="ident">Color::rgb_f</span>(<span class="number">0.0</span>, <span class="number">1.0</span>, <span class="number">0.0</span>);
    <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">BLUE</span>: <span class="ident">Color</span> <span class="op">=</span> <span class="ident">Color::rgb_f</span>(<span class="number">0.0</span>, <span class="number">0.0</span>, <span class="number">1.0</span>);
    <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">CYAN</span>: <span class="ident">Color</span> <span class="op">=</span> <span class="ident">Color::rgb_f</span>(<span class="number">0.0</span>, <span class="number">1.0</span>, <span class="number">1.0</span>);
    <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">YELLOW</span>: <span class="ident">Color</span> <span class="op">=</span> <span class="ident">Color::rgb_f</span>(<span class="number">1.0</span>, <span class="number">1.0</span>, <span class="number">0.0</span>);
    <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">PURPLE</span>: <span class="ident">Color</span> <span class="op">=</span> <span class="ident">Color::rgb_f</span>(<span class="number">0.5</span>, <span class="number">0.0</span>, <span class="number">0.5</span>);
    <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">PINK</span>: <span class="ident">Color</span> <span class="op">=</span> <span class="ident">Color::rgb_f</span>(<span class="number">1.0</span>, <span class="number">0.41</span>, <span class="number">0.71</span>);
    <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">ORANGE</span>: <span class="ident">Color</span> <span class="op">=</span> <span class="ident">Color::rgb_f</span>(<span class="number">1.0</span>, <span class="number">0.55</span>, <span class="number">0.0</span>);

    <span class="comment">// TODO should assert stuff about the inputs</span>

    <span class="comment">// TODO Once f32 can be used in const fn, make these const fn too and clean up call sites</span>
    <span class="comment">// dividing by 255.0. https://github.com/rust-lang/rust/issues/57241</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">rgb</span>(<span class="ident">r</span>: <span class="ident">usize</span>, <span class="ident">g</span>: <span class="ident">usize</span>, <span class="ident">b</span>: <span class="ident">usize</span>) -&gt; <span class="ident">Color</span> {
        <span class="ident">Color::rgba</span>(<span class="ident">r</span>, <span class="ident">g</span>, <span class="ident">b</span>, <span class="number">1.0</span>)
    }

    <span class="kw">pub</span> <span class="kw">const</span> <span class="kw">fn</span> <span class="ident">rgb_f</span>(<span class="ident">r</span>: <span class="ident">f32</span>, <span class="ident">g</span>: <span class="ident">f32</span>, <span class="ident">b</span>: <span class="ident">f32</span>) -&gt; <span class="ident">Color</span> {
        <span class="ident">Color</span> { <span class="ident">r</span>, <span class="ident">g</span>, <span class="ident">b</span>, <span class="ident">a</span>: <span class="number">1.0</span> }
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">rgba</span>(<span class="ident">r</span>: <span class="ident">usize</span>, <span class="ident">g</span>: <span class="ident">usize</span>, <span class="ident">b</span>: <span class="ident">usize</span>, <span class="ident">a</span>: <span class="ident">f32</span>) -&gt; <span class="ident">Color</span> {
        <span class="ident">Color</span> {
            <span class="ident">r</span>: (<span class="ident">r</span> <span class="kw">as</span> <span class="ident">f32</span>) <span class="op">/</span> <span class="number">255.0</span>,
            <span class="ident">g</span>: (<span class="ident">g</span> <span class="kw">as</span> <span class="ident">f32</span>) <span class="op">/</span> <span class="number">255.0</span>,
            <span class="ident">b</span>: (<span class="ident">b</span> <span class="kw">as</span> <span class="ident">f32</span>) <span class="op">/</span> <span class="number">255.0</span>,
            <span class="ident">a</span>,
        }
    }

    <span class="kw">pub</span> <span class="kw">const</span> <span class="kw">fn</span> <span class="ident">rgba_f</span>(<span class="ident">r</span>: <span class="ident">f32</span>, <span class="ident">g</span>: <span class="ident">f32</span>, <span class="ident">b</span>: <span class="ident">f32</span>, <span class="ident">a</span>: <span class="ident">f32</span>) -&gt; <span class="ident">Color</span> {
        <span class="ident">Color</span> { <span class="ident">r</span>, <span class="ident">g</span>, <span class="ident">b</span>, <span class="ident">a</span> }
    }

    <span class="kw">pub</span> <span class="kw">const</span> <span class="kw">fn</span> <span class="ident">grey</span>(<span class="ident">f</span>: <span class="ident">f32</span>) -&gt; <span class="ident">Color</span> {
        <span class="ident">Color::rgb_f</span>(<span class="ident">f</span>, <span class="ident">f</span>, <span class="ident">f</span>)
    }

    <span class="doccomment">/// Note this is incorrect for `Color::CLEAR`. Can&#39;t fix in a const fn.</span>
    <span class="kw">pub</span> <span class="kw">const</span> <span class="kw">fn</span> <span class="ident">alpha</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">a</span>: <span class="ident">f32</span>) -&gt; <span class="ident">Color</span> {
        <span class="ident">Color::rgba_f</span>(<span class="self">self</span>.<span class="ident">r</span>, <span class="self">self</span>.<span class="ident">g</span>, <span class="self">self</span>.<span class="ident">b</span>, <span class="ident">a</span>)
    }

    <span class="doccomment">/// Multiply the color&#39;s current alpha by the `factor`, returning a new color.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">multiply_alpha</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">factor</span>: <span class="ident">f32</span>) -&gt; <span class="ident">Color</span> {
        <span class="ident">Color::rgba_f</span>(<span class="self">self</span>.<span class="ident">r</span>, <span class="self">self</span>.<span class="ident">g</span>, <span class="self">self</span>.<span class="ident">b</span>, <span class="self">self</span>.<span class="ident">a</span> <span class="op">*</span> <span class="ident">factor</span>)
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">hex</span>(<span class="ident">raw</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) -&gt; <span class="ident">Color</span> {
        <span class="comment">// Skip the leading &#39;#&#39;</span>
        <span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">usize::from_str_radix</span>(<span class="kw-2">&amp;</span><span class="ident">raw</span>[<span class="number">1</span>..<span class="number">3</span>], <span class="number">16</span>).<span class="ident">unwrap</span>();
        <span class="kw">let</span> <span class="ident">g</span> <span class="op">=</span> <span class="ident">usize::from_str_radix</span>(<span class="kw-2">&amp;</span><span class="ident">raw</span>[<span class="number">3</span>..<span class="number">5</span>], <span class="number">16</span>).<span class="ident">unwrap</span>();
        <span class="kw">let</span> <span class="ident">b</span> <span class="op">=</span> <span class="ident">usize::from_str_radix</span>(<span class="kw-2">&amp;</span><span class="ident">raw</span>[<span class="number">5</span>..<span class="number">7</span>], <span class="number">16</span>).<span class="ident">unwrap</span>();
        <span class="ident">Color::rgb</span>(<span class="ident">r</span>, <span class="ident">g</span>, <span class="ident">b</span>)
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_hex</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="ident">String</span> {
        <span class="macro">format!</span>(
            <span class="string">&quot;#{:02X}{:02X}{:02X}&quot;</span>,
            (<span class="self">self</span>.<span class="ident">r</span> <span class="op">*</span> <span class="number">255.0</span>) <span class="kw">as</span> <span class="ident">usize</span>,
            (<span class="self">self</span>.<span class="ident">g</span> <span class="op">*</span> <span class="number">255.0</span>) <span class="kw">as</span> <span class="ident">usize</span>,
            (<span class="self">self</span>.<span class="ident">b</span> <span class="op">*</span> <span class="number">255.0</span>) <span class="kw">as</span> <span class="ident">usize</span>
        )
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">lerp</span>(<span class="self">self</span>, <span class="ident">other</span>: <span class="ident">Color</span>, <span class="ident">pct</span>: <span class="ident">f64</span>) -&gt; <span class="ident">Color</span> {
        <span class="ident">Color::rgba_f</span>(
            <span class="ident">lerp</span>(<span class="ident">pct</span>, (<span class="self">self</span>.<span class="ident">r</span>, <span class="ident">other</span>.<span class="ident">r</span>)),
            <span class="ident">lerp</span>(<span class="ident">pct</span>, (<span class="self">self</span>.<span class="ident">g</span>, <span class="ident">other</span>.<span class="ident">g</span>)),
            <span class="ident">lerp</span>(<span class="ident">pct</span>, (<span class="self">self</span>.<span class="ident">b</span>, <span class="ident">other</span>.<span class="ident">b</span>)),
            <span class="ident">lerp</span>(<span class="ident">pct</span>, (<span class="self">self</span>.<span class="ident">a</span>, <span class="ident">other</span>.<span class="ident">a</span>)),
        )
    }

    <span class="comment">// Mix the color with black</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">shade</span>(<span class="self">self</span>, <span class="ident">black_ratio</span>: <span class="ident">f64</span>) -&gt; <span class="ident">Color</span> {
        <span class="self">self</span>.<span class="ident">lerp</span>(<span class="ident">Color::BLACK</span>, <span class="ident">black_ratio</span>)
    }

    <span class="comment">// Mix the color with white</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">tint</span>(<span class="self">self</span>, <span class="ident">white_ratio</span>: <span class="ident">f64</span>) -&gt; <span class="ident">Color</span> {
        <span class="self">self</span>.<span class="ident">lerp</span>(<span class="ident">Color::WHITE</span>, <span class="ident">white_ratio</span>)
    }

    <span class="comment">// A theme agnostic way to get a more/less intense color without affecting alpha.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">dull</span>(<span class="self">self</span>, <span class="ident">ratio</span>: <span class="ident">f64</span>) -&gt; <span class="ident">Color</span> {
        <span class="self">self</span>.<span class="ident">lerp</span>(<span class="ident">Color::grey</span>(<span class="number">0.5</span>), <span class="ident">ratio</span>)
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">invert</span>(<span class="self">self</span>) -&gt; <span class="ident">Color</span> {
        <span class="ident">Color::rgba_f</span>(<span class="number">1.0</span> <span class="op">-</span> <span class="self">self</span>.<span class="ident">r</span>, <span class="number">1.0</span> <span class="op">-</span> <span class="self">self</span>.<span class="ident">g</span>, <span class="number">1.0</span> <span class="op">-</span> <span class="self">self</span>.<span class="ident">b</span>, <span class="self">self</span>.<span class="ident">a</span>)
    }
}

<span class="comment">// https://developer.mozilla.org/en-US/docs/Web/CSS/linear-gradient is the best reference I&#39;ve</span>
<span class="comment">// found, even though it&#39;s technically for CSS, not SVG. Ah, and</span>
<span class="comment">// https://www.w3.org/TR/SVG11/pservers.html</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Clone</span>, <span class="ident">PartialEq</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">LinearGradient</span> {
    <span class="kw">pub</span> <span class="ident">line</span>: <span class="ident">Line</span>,
    <span class="kw">pub</span> <span class="ident">stops</span>: <span class="ident">Vec</span><span class="op">&lt;</span>(<span class="ident">f64</span>, <span class="ident">Color</span>)<span class="op">&gt;</span>,
}

<span class="kw">impl</span> <span class="ident">LinearGradient</span> {
    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">new_fill</span>(<span class="ident">lg</span>: <span class="kw-2">&amp;</span><span class="ident">usvg::LinearGradient</span>) -&gt; <span class="ident">Fill</span> {
        <span class="kw">let</span> <span class="ident">line</span> <span class="op">=</span> <span class="ident">Line::must_new</span>(<span class="ident">Pt2D::new</span>(<span class="ident">lg</span>.<span class="ident">x1</span>, <span class="ident">lg</span>.<span class="ident">y1</span>), <span class="ident">Pt2D::new</span>(<span class="ident">lg</span>.<span class="ident">x2</span>, <span class="ident">lg</span>.<span class="ident">y2</span>));
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">stops</span> <span class="op">=</span> <span class="ident">Vec::new</span>();
        <span class="kw">for</span> <span class="ident">stop</span> <span class="kw">in</span> <span class="kw-2">&amp;</span><span class="ident">lg</span>.<span class="ident">stops</span> {
            <span class="kw">let</span> <span class="ident">color</span> <span class="op">=</span> <span class="ident">Color::rgba</span>(
                <span class="ident">stop</span>.<span class="ident">color</span>.<span class="ident">red</span> <span class="kw">as</span> <span class="ident">usize</span>,
                <span class="ident">stop</span>.<span class="ident">color</span>.<span class="ident">green</span> <span class="kw">as</span> <span class="ident">usize</span>,
                <span class="ident">stop</span>.<span class="ident">color</span>.<span class="ident">blue</span> <span class="kw">as</span> <span class="ident">usize</span>,
                <span class="ident">stop</span>.<span class="ident">opacity</span>.<span class="ident">value</span>() <span class="kw">as</span> <span class="ident">f32</span>,
            );
            <span class="ident">stops</span>.<span class="ident">push</span>((<span class="ident">stop</span>.<span class="ident">offset</span>.<span class="ident">value</span>(), <span class="ident">color</span>));
        }
        <span class="ident">Fill::LinearGradient</span>(<span class="ident">LinearGradient</span> { <span class="ident">line</span>, <span class="ident">stops</span> })
    }

    <span class="kw">fn</span> <span class="ident">interp</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">pt</span>: <span class="ident">Pt2D</span>) -&gt; <span class="ident">Color</span> {
        <span class="kw">let</span> <span class="ident">pct</span> <span class="op">=</span> <span class="self">self</span>
            .<span class="ident">line</span>
            .<span class="ident">percent_along_of_point</span>(<span class="self">self</span>.<span class="ident">line</span>.<span class="ident">to_polyline</span>().<span class="ident">project_pt</span>(<span class="ident">pt</span>))
            .<span class="ident">unwrap</span>();
        <span class="kw">if</span> <span class="ident">pct</span> <span class="op">&lt;</span> <span class="self">self</span>.<span class="ident">stops</span>[<span class="number">0</span>].<span class="number">0</span> {
            <span class="kw">return</span> <span class="self">self</span>.<span class="ident">stops</span>[<span class="number">0</span>].<span class="number">1</span>;
        }
        <span class="kw">if</span> <span class="ident">pct</span> <span class="op">&gt;</span> <span class="self">self</span>.<span class="ident">stops</span>.<span class="ident">last</span>().<span class="ident">unwrap</span>().<span class="number">0</span> {
            <span class="kw">return</span> <span class="self">self</span>.<span class="ident">stops</span>.<span class="ident">last</span>().<span class="ident">unwrap</span>().<span class="number">1</span>;
        }
        <span class="comment">// In between two</span>
        <span class="kw">for</span> ((<span class="ident">pct1</span>, <span class="ident">c1</span>), (<span class="ident">pct2</span>, <span class="ident">c2</span>)) <span class="kw">in</span> <span class="self">self</span>.<span class="ident">stops</span>.<span class="ident">iter</span>().<span class="ident">zip</span>(<span class="self">self</span>.<span class="ident">stops</span>.<span class="ident">iter</span>().<span class="ident">skip</span>(<span class="number">1</span>)) {
            <span class="kw">if</span> <span class="ident">pct</span> <span class="op">&gt;</span><span class="op">=</span> <span class="kw-2">*</span><span class="ident">pct1</span> <span class="op">&amp;&amp;</span> <span class="ident">pct</span> <span class="op">&lt;</span><span class="op">=</span> <span class="kw-2">*</span><span class="ident">pct2</span> {
                <span class="kw">return</span> <span class="ident">c1</span>.<span class="ident">lerp</span>(<span class="kw-2">*</span><span class="ident">c2</span>, <span class="ident">to_pct</span>(<span class="ident">pct</span>, (<span class="kw-2">*</span><span class="ident">pct1</span>, <span class="kw-2">*</span><span class="ident">pct2</span>)));
            }
        }
        <span class="macro">unreachable!</span>()
    }
}

<span class="kw">fn</span> <span class="ident">to_pct</span>(<span class="ident">value</span>: <span class="ident">f64</span>, (<span class="ident">low</span>, <span class="ident">high</span>): (<span class="ident">f64</span>, <span class="ident">f64</span>)) -&gt; <span class="ident">f64</span> {
    <span class="macro">assert!</span>(<span class="ident">low</span> <span class="op">&lt;</span><span class="op">=</span> <span class="ident">high</span>);
    <span class="macro">assert!</span>(<span class="ident">value</span> <span class="op">&gt;</span><span class="op">=</span> <span class="ident">low</span>);
    <span class="macro">assert!</span>(<span class="ident">value</span> <span class="op">&lt;</span><span class="op">=</span> <span class="ident">high</span>);
    (<span class="ident">value</span> <span class="op">-</span> <span class="ident">low</span>) <span class="op">/</span> (<span class="ident">high</span> <span class="op">-</span> <span class="ident">low</span>)
}

<span class="kw">fn</span> <span class="ident">lerp</span>(<span class="ident">pct</span>: <span class="ident">f64</span>, (<span class="ident">x1</span>, <span class="ident">x2</span>): (<span class="ident">f32</span>, <span class="ident">f32</span>)) -&gt; <span class="ident">f32</span> {
    <span class="ident">x1</span> <span class="op">+</span> (<span class="ident">pct</span> <span class="kw">as</span> <span class="ident">f32</span>) <span class="op">*</span> (<span class="ident">x2</span> <span class="op">-</span> <span class="ident">x1</span>)
}

<span class="kw">impl</span> <span class="ident">Fill</span> {
    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">shader_style</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">pt</span>: <span class="ident">Pt2D</span>) -&gt; [<span class="ident">f32</span>; <span class="number">5</span>] {
        <span class="kw">match</span> <span class="self">self</span> {
            <span class="ident">Fill::Color</span>(<span class="ident">c</span>) =&gt; [<span class="ident">c</span>.<span class="ident">r</span>, <span class="ident">c</span>.<span class="ident">g</span>, <span class="ident">c</span>.<span class="ident">b</span>, <span class="ident">c</span>.<span class="ident">a</span>, <span class="number">0.0</span>],
            <span class="ident">Fill::LinearGradient</span>(<span class="kw-2">ref</span> <span class="ident">lg</span>) =&gt; {
                <span class="kw">let</span> <span class="ident">c</span> <span class="op">=</span> <span class="ident">lg</span>.<span class="ident">interp</span>(<span class="ident">pt</span>);
                [<span class="ident">c</span>.<span class="ident">r</span>, <span class="ident">c</span>.<span class="ident">g</span>, <span class="ident">c</span>.<span class="ident">b</span>, <span class="ident">c</span>.<span class="ident">a</span>, <span class="number">0.0</span>]
            }
            <span class="ident">Fill::Texture</span>(<span class="ident">texture</span>) =&gt; [<span class="number">1.0</span>, <span class="number">1.0</span>, <span class="number">1.0</span>, <span class="number">1.0</span>, <span class="ident">texture</span>.<span class="number">0</span> <span class="kw">as</span> <span class="ident">f32</span>],
            <span class="ident">Fill::ColoredTexture</span>(<span class="ident">color</span>, <span class="ident">texture</span>) =&gt; {
                [<span class="ident">color</span>.<span class="ident">r</span>, <span class="ident">color</span>.<span class="ident">g</span>, <span class="ident">color</span>.<span class="ident">b</span>, <span class="ident">color</span>.<span class="ident">a</span>, <span class="ident">texture</span>.<span class="number">0</span> <span class="kw">as</span> <span class="ident">f32</span>]
            }
        }
    }
}

<span class="kw">impl</span> <span class="ident">std::convert::From</span><span class="op">&lt;</span><span class="ident">Color</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">Fill</span> {
    <span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">color</span>: <span class="ident">Color</span>) -&gt; <span class="ident">Fill</span> {
        <span class="ident">Fill::Color</span>(<span class="ident">color</span>)
    }
}

<span class="kw">impl</span> <span class="ident">std::convert::From</span><span class="op">&lt;</span><span class="ident">Texture</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">Fill</span> {
    <span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">texture</span>: <span class="ident">Texture</span>) -&gt; <span class="ident">Fill</span> {
        <span class="ident">Fill::Texture</span>(<span class="ident">texture</span>)
    }
}
</code></pre></div>
</section><section id="search" class="content hidden"></section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="widgetry" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.61.0 (fe5b13d68 2022-05-18)" ></div>
</body></html>