<!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/speed.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>speed.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" href="../../favicon-16x16.png"> 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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> </pre><div class="example-wrap"><pre class="rust "> <span class="kw">use</span> <span class="ident">std</span>::{<span class="ident">cmp</span>, <span class="ident">ops</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">trim_f64</span>, <span class="ident">Distance</span>, <span class="ident">Duration</span>, <span class="ident">UnitFmt</span>}; <span class="doccomment">/// In meters per second. Can be negative.</span> <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Copy</span>, <span class="ident">Debug</span>, <span class="ident">PartialEq</span>, <span class="ident">PartialOrd</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">Speed</span>(<span class="ident">f64</span>); <span class="comment">// By construction, Speed is a finite f64 with trimmed precision.</span> <span class="kw">impl</span> <span class="ident">Eq</span> <span class="kw">for</span> <span class="ident">Speed</span> {} <span class="kw">impl</span> <span class="ident">Ord</span> <span class="kw">for</span> <span class="ident">Speed</span> { <span class="kw">fn</span> <span class="ident">cmp</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">Speed</span>) <span class="op">-</span><span class="op">></span> <span class="ident">cmp</span>::<span class="ident">Ordering</span> { <span class="self">self</span>.<span class="ident">partial_cmp</span>(<span class="ident">other</span>).<span class="ident">unwrap</span>() } } <span class="kw">impl</span> <span class="ident">Speed</span> { <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">ZERO</span>: <span class="ident">Speed</span> <span class="op">=</span> <span class="ident">Speed</span>::<span class="ident">const_meters_per_second</span>(<span class="number">0.0</span>); <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">meters_per_second</span>(<span class="ident">value</span>: <span class="ident">f64</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Speed</span> { <span class="kw">if</span> <span class="op">!</span><span class="ident">value</span>.<span class="ident">is_finite</span>() { <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"Bad Speed {}"</span>, <span class="ident">value</span>); } <span class="ident">Speed</span>(<span class="ident">trim_f64</span>(<span class="ident">value</span>)) } <span class="kw">pub</span> <span class="kw">const</span> <span class="kw">fn</span> <span class="ident">const_meters_per_second</span>(<span class="ident">value</span>: <span class="ident">f64</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Speed</span> { <span class="ident">Speed</span>(<span class="ident">value</span>) } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">miles_per_hour</span>(<span class="ident">value</span>: <span class="ident">f64</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Speed</span> { <span class="ident">Speed</span>::<span class="ident">meters_per_second</span>(<span class="number">0.44704</span> <span class="op">*</span> <span class="ident">value</span>) } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">km_per_hour</span>(<span class="ident">value</span>: <span class="ident">f64</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Speed</span> { <span class="ident">Speed</span>::<span class="ident">meters_per_second</span>(<span class="number">0.277778</span> <span class="op">*</span> <span class="ident">value</span>) } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">from_dist_time</span>(<span class="ident">d</span>: <span class="ident">Distance</span>, <span class="ident">t</span>: <span class="ident">Duration</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Speed</span> { <span class="ident">Speed</span>::<span class="ident">meters_per_second</span>(<span class="ident">d</span>.<span class="ident">inner_meters</span>() <span class="op">/</span> <span class="ident">t</span>.<span class="ident">inner_seconds</span>()) } <span class="comment">// TODO Remove if possible.</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">inner_meters_per_second</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">f64</span> { <span class="self">self</span>.<span class="number">0</span> } <span class="doccomment">/// Describes the speed according to formatting rules.</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_string</span>(<span class="self">self</span>, <span class="ident">fmt</span>: <span class="kw-2">&</span><span class="ident">UnitFmt</span>) <span class="op">-</span><span class="op">></span> <span class="ident">String</span> { <span class="kw">if</span> <span class="ident">fmt</span>.<span class="ident">metric</span> { <span class="macro">format</span><span class="macro">!</span>(<span class="string">"{} km/h"</span>, (<span class="self">self</span>.<span class="number">0</span> <span class="op">*</span> <span class="number">3.6</span>).<span class="ident">round</span>()) } <span class="kw">else</span> { <span class="macro">format</span><span class="macro">!</span>(<span class="string">"{} mph"</span>, (<span class="self">self</span>.<span class="number">0</span> <span class="op">*</span> <span class="number">2.23694</span>).<span class="ident">round</span>()) } } } <span class="kw">impl</span> <span class="ident">ops</span>::<span class="ident">Add</span> <span class="kw">for</span> <span class="ident">Speed</span> { <span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="ident">Speed</span>; <span class="kw">fn</span> <span class="ident">add</span>(<span class="self">self</span>, <span class="ident">other</span>: <span class="ident">Speed</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Speed</span> { <span class="ident">Speed</span>::<span class="ident">meters_per_second</span>(<span class="self">self</span>.<span class="number">0</span> <span class="op">+</span> <span class="ident">other</span>.<span class="number">0</span>) } } <span class="kw">impl</span> <span class="ident">ops</span>::<span class="ident">Sub</span> <span class="kw">for</span> <span class="ident">Speed</span> { <span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="ident">Speed</span>; <span class="kw">fn</span> <span class="ident">sub</span>(<span class="self">self</span>, <span class="ident">other</span>: <span class="ident">Speed</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Speed</span> { <span class="ident">Speed</span>::<span class="ident">meters_per_second</span>(<span class="self">self</span>.<span class="number">0</span> <span class="op">-</span> <span class="ident">other</span>.<span class="number">0</span>) } } <span class="kw">impl</span> <span class="ident">ops</span>::<span class="ident">Div</span> <span class="kw">for</span> <span class="ident">Speed</span> { <span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="ident">f64</span>; <span class="kw">fn</span> <span class="ident">div</span>(<span class="self">self</span>, <span class="ident">other</span>: <span class="ident">Speed</span>) <span class="op">-</span><span class="op">></span> <span class="ident">f64</span> { <span class="self">self</span>.<span class="number">0</span> <span class="op">/</span> <span class="ident">other</span>.<span class="number">0</span> } } <span class="kw">impl</span> <span class="ident">ops</span>::<span class="ident">Neg</span> <span class="kw">for</span> <span class="ident">Speed</span> { <span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="ident">Speed</span>; <span class="kw">fn</span> <span class="ident">neg</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Speed</span> { <span class="ident">Speed</span>::<span class="ident">meters_per_second</span>(<span class="op">-</span><span class="self">self</span>.<span class="number">0</span>) } } <span class="kw">impl</span> <span class="ident">ops</span>::<span class="ident">Mul</span><span class="op"><</span><span class="ident">f64</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Speed</span> { <span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="ident">Speed</span>; <span class="kw">fn</span> <span class="ident">mul</span>(<span class="self">self</span>, <span class="ident">scalar</span>: <span class="ident">f64</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Speed</span> { <span class="ident">Speed</span>::<span class="ident">meters_per_second</span>(<span class="self">self</span>.<span class="number">0</span> <span class="op">*</span> <span class="ident">scalar</span>) } } <span class="kw">impl</span> <span class="ident">ops</span>::<span class="ident">Mul</span><span class="op"><</span><span class="ident">Speed</span><span class="op">></span> <span class="kw">for</span> <span class="ident">f64</span> { <span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="ident">Speed</span>; <span class="kw">fn</span> <span class="ident">mul</span>(<span class="self">self</span>, <span class="ident">other</span>: <span class="ident">Speed</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Speed</span> { <span class="ident">Speed</span>::<span class="ident">meters_per_second</span>(<span class="self">self</span> <span class="op">*</span> <span class="ident">other</span>.<span class="number">0</span>) } } <span class="kw">impl</span> <span class="ident">ops</span>::<span class="ident">Mul</span><span class="op"><</span><span class="ident">Duration</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Speed</span> { <span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="ident">Distance</span>; <span class="kw">fn</span> <span class="ident">mul</span>(<span class="self">self</span>, <span class="ident">other</span>: <span class="ident">Duration</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Distance</span> { <span class="ident">Distance</span>::<span class="ident">meters</span>(<span class="self">self</span>.<span class="number">0</span> <span class="op">*</span> <span class="ident">other</span>.<span class="ident">inner_seconds</span>()) } } </pre></div> </section><section id="search" class="content hidden"></section><section class="footer"></section><div id="rustdoc-vars" data-root-path="../../" data-current-crate="geom"></div> <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>