21 lines
4.3 KiB
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21 lines
4.3 KiB
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<!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="If you have a value animating over time, how much towards its target do you need to move it this frame?"><title>interpolation_factor in emath - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../static.files/rustdoc-42caa33d.css"><meta name="rustdoc-vars" data-root-path="../" data-static-root-path="../static.files/" data-current-crate="emath" data-themes="" data-resource-suffix="" data-rustdoc-version="1.84.0 (9fc6b4312 2025-01-07)" data-channel="1.84.0" data-search-js="search-92e6798f.js" data-settings-js="settings-0f613d39.js" ><script src="../static.files/storage-59e33391.js"></script><script defer src="sidebar-items.js"></script><script defer src="../static.files/main-5f194d8c.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-893ab5e7.css"></noscript><link rel="alternate icon" type="image/png" href="../static.files/favicon-32x32-6580c154.png"><link rel="icon" type="image/svg+xml" href="../static.files/favicon-044be391.svg"></head><body class="rustdoc fn"><!--[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" title="show sidebar"></button></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../emath/index.html">emath</a><span class="version">0.30.0</span></h2></div><div class="sidebar-elems"><div id="rustdoc-modnav"></div></div></nav><div class="sidebar-resizer"></div><main><div class="width-limiter"><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><span class="rustdoc-breadcrumbs"><a href="index.html">emath</a></span><h1>Function <span class="fn">interpolation_factor</span><button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../src/emath/lib.rs.html#410-425">Source</a> </span></div><pre class="rust item-decl"><code>pub fn interpolation_factor(
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(start_time, end_time): (<a class="primitive" href="https://doc.rust-lang.org/1.84.0/std/primitive.f64.html">f64</a>, <a class="primitive" href="https://doc.rust-lang.org/1.84.0/std/primitive.f64.html">f64</a>),
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current_time: <a class="primitive" href="https://doc.rust-lang.org/1.84.0/std/primitive.f64.html">f64</a>,
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dt: <a class="primitive" href="https://doc.rust-lang.org/1.84.0/std/primitive.f32.html">f32</a>,
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easing: impl <a class="trait" href="https://doc.rust-lang.org/1.84.0/core/ops/function/trait.Fn.html" title="trait core::ops::function::Fn">Fn</a>(<a class="primitive" href="https://doc.rust-lang.org/1.84.0/std/primitive.f32.html">f32</a>) -> <a class="primitive" href="https://doc.rust-lang.org/1.84.0/std/primitive.f32.html">f32</a>,
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) -> <a class="primitive" href="https://doc.rust-lang.org/1.84.0/std/primitive.f32.html">f32</a></code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>If you have a value animating over time,
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how much towards its target do you need to move it this frame?</p>
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<p>You only need to store the start time and target value in order to animate using this function.</p>
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<div class="example-wrap"><pre class="language-rs"><code>struct Animation {
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current_value: f32,
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animation_time_span: (f64, f64),
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target_value: f32,
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}
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impl Animation {
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fn update(&mut self, now: f64, dt: f32) {
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let t = interpolation_factor(self.animation_time_span, now, dt, ease_in_ease_out);
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self.current_value = emath::lerp(self.current_value..=self.target_value, t);
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}
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}</code></pre></div></div></details></section></div></main></body></html> |