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54 lines
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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="A generic representation for paths that allow more control over how endpoints and control points are stored."><title>cosmic::widget::canvas::path::lyon_path::commands - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.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-aa0817cf.css"><meta name="rustdoc-vars" data-root-path="../../../../../../" data-static-root-path="../../../../../../static.files/" data-current-crate="cosmic" data-themes="" data-resource-suffix="" data-rustdoc-version="1.90.0-nightly (3048886e5 2025-07-30)" data-channel="nightly" data-search-js="search-fa3e91e5.js" data-settings-js="settings-5514c975.js" ><script src="../../../../../../static.files/storage-68b7e25d.js"></script><script defer src="../sidebar-items.js"></script><script defer src="../../../../../../static.files/main-eebb9057.js"></script><noscript><link rel="stylesheet" href="../../../../../../static.files/noscript-32bb7600.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 mod"><!--[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="../../../../../../cosmic/index.html">cosmic</a><span class="version">1.0.0</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">Module commands</a></h2><h3><a href="#">Sections</a></h3><ul class="block top-toc"><li><a href="#motivation" title="Motivation">Motivation</a></li><li><a href="#examples" title="Examples">Examples</a></li></ul><h3><a href="#structs">Module Items</a></h3><ul class="block"><li><a href="#structs" title="Structs">Structs</a></li></ul></section><div id="rustdoc-modnav"><h2><a href="../index.html">In cosmic::<wbr>widget::<wbr>canvas::<wbr>path::<wbr>lyon_<wbr>path</a></h2></div></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><div class="width-limiter"><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><div class="rustdoc-breadcrumbs"><a href="../../../../../index.html">cosmic</a>::<wbr><a href="../../../../index.html">widget</a>::<wbr><a href="../../../index.html">canvas</a>::<wbr><a href="../../index.html">path</a>::<wbr><a href="../index.html">lyon_path</a></div><h1>Module <span>commands</span><button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"></span></div><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>A generic representation for paths that allow more control over how
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endpoints and control points are stored.</p>
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<h2 id="motivation"><a class="doc-anchor" href="#motivation">§</a>Motivation</h2>
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<p>The default <code>Path</code> data structure in this crate is works well for the
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most common use cases. Sometimes, however, it is useful to be able to
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specify exactly how endpoints and control points are stored instead of
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relying on implicitly following the order of the events.</p>
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<p>This module contains bricks to help with building custom path representations.
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The central piece is the <a href="struct.PathCommands.html"><code>PathCommands</code></a> buffer and
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its <a href="struct.PathCommandsBuilder.html"><code>PathCommandsBuilder</code></a>, providing a compact
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representation for path events with IDs instead of positions.</p>
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<h2 id="examples"><a class="doc-anchor" href="#examples">§</a>Examples</h2>
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<p>The following example shows how <code>PathCommands</code> can be used together with an
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external buffers for positions to implement features similar to the default
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Path type with a different data structure.</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>lyon_path::{EndpointId, Event, IdEvent, commands::PathCommands};
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<span class="kw">let </span>points = <span class="kw-2">&</span>[
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[<span class="number">0.0</span>, <span class="number">0.0</span>],
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[<span class="number">1.0</span>, <span class="number">1.0</span>],
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[<span class="number">0.0</span>, <span class="number">2.0</span>],
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];
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<span class="kw">let </span><span class="kw-2">mut </span>cmds = PathCommands::builder();
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cmds.begin(EndpointId(<span class="number">0</span>));
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cmds.line_to(EndpointId(<span class="number">1</span>));
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cmds.line_to(EndpointId(<span class="number">2</span>));
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cmds.end(<span class="bool-val">true</span>);
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<span class="kw">let </span>cmds = cmds.build();
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<span class="kw">for </span>event <span class="kw">in </span><span class="kw-2">&</span>cmds {
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<span class="kw">match </span>event {
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IdEvent::Begin { at } => { <span class="macro">println!</span>(<span class="string">"move to {:?}"</span>, points[at.to_usize()]); }
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IdEvent::Line { to, .. } => { <span class="macro">println!</span>(<span class="string">"line to {:?}"</span>, points[to.to_usize()]); }
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IdEvent::End { close: <span class="bool-val">true</span>, .. } => { <span class="macro">println!</span>(<span class="string">"close"</span>); }
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<span class="kw">_ </span>=> { <span class="macro">panic!</span>(<span class="string">"unexpected event!"</span>) }
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}
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}
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<span class="comment">// Iterate over the points directly using CommandsPathSlice
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</span><span class="kw">for </span>event <span class="kw">in </span>cmds.path_slice(points, points).events() {
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<span class="kw">match </span>event {
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Event::Begin { at } => { <span class="macro">println!</span>(<span class="string">"move to {:?}"</span>, at); }
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Event::Line { to, .. } => { <span class="macro">println!</span>(<span class="string">"line to {:?}"</span>, to); }
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Event::End { close: <span class="bool-val">true</span>, .. } => { <span class="macro">println!</span>(<span class="string">"close"</span>); }
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<span class="kw">_ </span>=> { <span class="macro">panic!</span>(<span class="string">"unexpected event!"</span>) }
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}
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}
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</code></pre></div>
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</div></details><h2 id="structs" class="section-header">Structs<a href="#structs" class="anchor">§</a></h2><dl class="item-table"><dt><a class="struct" href="struct.CommandsPathSlice.html" title="struct cosmic::widget::canvas::path::lyon_path::commands::CommandsPathSlice">Commands<wbr>Path<wbr>Slice</a></dt><dd>A view on a <a href="struct.PathCommands.html"><code>PathCommands</code></a> buffer and
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two slices for endpoints and control points, providing similar
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functionalities as <code>PathSlice</code>.</dd><dt><a class="struct" href="struct.Events.html" title="struct cosmic::widget::canvas::path::lyon_path::commands::Events">Events</a></dt><dd>An iterator of <code>Event<&Endpoint, &ControlPoint></code>.</dd><dt><a class="struct" href="struct.Iter.html" title="struct cosmic::widget::canvas::path::lyon_path::commands::Iter">Iter</a></dt><dd>An iterator of <code>Event<&Endpoint, &ControlPoint></code>.</dd><dt><a class="struct" href="struct.PathCommands.html" title="struct cosmic::widget::canvas::path::lyon_path::commands::PathCommands">Path<wbr>Commands</a></dt><dd>The commands of a path encoded in a single array using IDs to refer
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to endpoints and control points externally.</dd><dt><a class="struct" href="struct.PathCommandsBuilder.html" title="struct cosmic::widget::canvas::path::lyon_path::commands::PathCommandsBuilder">Path<wbr>Commands<wbr>Builder</a></dt><dd>Builds path commands.</dd><dt><a class="struct" href="struct.PathCommandsSlice.html" title="struct cosmic::widget::canvas::path::lyon_path::commands::PathCommandsSlice">Path<wbr>Commands<wbr>Slice</a></dt><dd>A view over <a href="struct.PathCommands.html"><code>PathCommands</code></a>.</dd><dt><a class="struct" href="struct.PointEvents.html" title="struct cosmic::widget::canvas::path::lyon_path::commands::PointEvents">Point<wbr>Events</a></dt><dd>An iterator of <code>PathEvent</code>.</dd></dl></section></div></main></body></html> |