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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="Source to the Rust file `/home/mrh/.cargo/registry/src/github.com-1ecc6299db9ec823/andrew-0.2.1/src/text/mod.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>mod.rs.html -- 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="../../../dark.css"><link rel="stylesheet" type="text/css" href="../../../light.css" id="themeStyle"><script src="../../../storage.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="shortcut icon" href="../../../favicon.ico"><style type="text/css">#crate-search{background-image:url("../../../down-arrow.svg");}</style></head><body class="rustdoc source"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">&#9776;</div><a href='../../../andrew/index.html'><div class='logo-container'><img src='../../../rust-logo.png' alt='logo'></div></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../../theme.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><a id="settings-menu" href="../../../settings.html"><img src="../../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><pre class="line-numbers"><span id="1"> 1</span>
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</pre><div class="example-wrap"><pre class="rust ">
<span class="doccomment">/// A module that contains functions and objects relating to fontconfig</span>
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">fontconfig</span>;
<span class="kw">use</span> <span class="ident">rusttype</span>::{<span class="ident">point</span>, <span class="ident">Font</span>, <span class="ident">Scale</span>, <span class="ident">SharedBytes</span>, <span class="ident">VMetrics</span>};
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">fs</span>::<span class="ident">File</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>::<span class="ident">Read</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">path</span>::<span class="ident">PathBuf</span>;
<span class="kw">use</span> <span class="ident">Canvas</span>;
<span class="kw">use</span> <span class="ident">Drawable</span>;
<span class="doccomment">/// A drawable object that represents text</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Text</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> {
<span class="doccomment">/// The position of the text on the canvas</span>
<span class="kw">pub</span> <span class="ident">pos</span>: (<span class="ident">usize</span>, <span class="ident">usize</span>),
<span class="doccomment">/// The color of the text</span>
<span class="kw">pub</span> <span class="ident">color</span>: [<span class="ident">u8</span>; <span class="number">4</span>],
<span class="doccomment">/// The text that is rendered to the canvas on draw</span>
<span class="kw">pub</span> <span class="ident">text</span>: <span class="ident">String</span>,
<span class="doccomment">/// The font used in rendering the text</span>
<span class="kw">pub</span> <span class="ident">font</span>: <span class="ident">Font</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>,
<span class="doccomment">/// The scale that is applied to the text</span>
<span class="kw">pub</span> <span class="ident">scale</span>: <span class="ident">Scale</span>,
<span class="doccomment">/// The vertical metrics of the text</span>
<span class="kw">pub</span> <span class="ident">v_metrics</span>: <span class="ident">VMetrics</span>,
}
<span class="doccomment">/// Loads a font file into a `Vec&lt;u8&gt;`</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">load_font_file</span><span class="op">&lt;</span><span class="ident">P</span>: <span class="ident">Into</span><span class="op">&lt;</span><span class="ident">PathBuf</span><span class="op">&gt;</span><span class="op">&gt;</span>(<span class="ident">path</span>: <span class="ident">P</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">data</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">file</span> <span class="op">=</span> <span class="ident">File</span>::<span class="ident">open</span>(<span class="ident">path</span>.<span class="ident">into</span>()).<span class="ident">expect</span>(<span class="string">&quot;Could not open font file&quot;</span>);
<span class="ident">file</span>.<span class="ident">read_to_end</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">data</span>)
.<span class="ident">expect</span>(<span class="string">&quot;Could not read font file&quot;</span>);
<span class="ident">data</span>
}
<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> <span class="ident">Text</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> {
<span class="doccomment">/// Creates a new Text object</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span><span class="op">&lt;</span><span class="ident">P</span>: <span class="ident">Into</span><span class="op">&lt;</span><span class="ident">SharedBytes</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span><span class="op">&gt;</span>, <span class="ident">T</span>: <span class="ident">Into</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span><span class="op">&gt;</span>(
<span class="ident">pos</span>: (<span class="ident">usize</span>, <span class="ident">usize</span>),
<span class="ident">color</span>: [<span class="ident">u8</span>; <span class="number">4</span>],
<span class="ident">font_data</span>: <span class="ident">P</span>,
<span class="ident">height</span>: <span class="ident">f32</span>,
<span class="ident">width_scale</span>: <span class="ident">f32</span>,
<span class="ident">text</span>: <span class="ident">T</span>,
) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Text</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> {
<span class="kw">let</span> <span class="ident">text</span> <span class="op">=</span> <span class="ident">text</span>.<span class="ident">into</span>();
<span class="comment">// Create font</span>
<span class="kw">let</span> <span class="ident">font</span> <span class="op">=</span> <span class="ident">Font</span>::<span class="ident">from_bytes</span>(<span class="ident">font_data</span>).<span class="ident">expect</span>(<span class="string">&quot;Error constructing Font&quot;</span>);
<span class="comment">// Create scale</span>
<span class="kw">let</span> <span class="ident">scale</span> <span class="op">=</span> <span class="ident">Scale</span> {
<span class="ident">x</span>: <span class="ident">height</span> <span class="op">*</span> <span class="ident">width_scale</span>,
<span class="ident">y</span>: <span class="ident">height</span>,
};
<span class="comment">// Create needed metrics</span>
<span class="kw">let</span> <span class="ident">v_metrics</span> <span class="op">=</span> <span class="ident">font</span>.<span class="ident">v_metrics</span>(<span class="ident">scale</span>);
<span class="ident">Text</span> {
<span class="ident">pos</span>,
<span class="ident">color</span>,
<span class="ident">text</span>: <span class="ident">text</span>.<span class="ident">clone</span>(),
<span class="ident">scale</span>,
<span class="ident">v_metrics</span>,
<span class="ident">font</span>,
}
}
<span class="kw">fn</span> <span class="ident">draw_text</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">canvas</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Canvas</span>) {
<span class="kw">let</span> <span class="ident">glyphs</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw">_</span><span class="op">&gt;</span> <span class="op">=</span> <span class="self">self</span>
.<span class="ident">font</span>
.<span class="ident">layout</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">text</span>, <span class="self">self</span>.<span class="ident">scale</span>, <span class="ident">point</span>(<span class="number">0.0</span>, <span class="self">self</span>.<span class="ident">v_metrics</span>.<span class="ident">ascent</span>))
.<span class="ident">collect</span>();
<span class="kw">for</span> <span class="ident">glyph</span> <span class="kw">in</span> <span class="ident">glyphs</span> {
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">bounding_box</span>) <span class="op">=</span> <span class="ident">glyph</span>.<span class="ident">pixel_bounding_box</span>() {
<span class="ident">glyph</span>.<span class="ident">draw</span>(<span class="op">|</span><span class="ident">x</span>, <span class="ident">y</span>, <span class="ident">v</span><span class="op">|</span> {
<span class="kw">let</span> <span class="ident">x</span> <span class="op">=</span> ((<span class="ident">x</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">+</span> <span class="self">self</span>.<span class="ident">pos</span>.<span class="number">0</span>) <span class="kw">as</span> <span class="ident">i32</span> <span class="op">+</span> <span class="ident">bounding_box</span>.<span class="ident">min</span>.<span class="ident">x</span>) <span class="kw">as</span> <span class="ident">usize</span>;
<span class="kw">let</span> <span class="ident">y</span> <span class="op">=</span> ((<span class="ident">y</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">+</span> <span class="self">self</span>.<span class="ident">pos</span>.<span class="number">1</span>) <span class="kw">as</span> <span class="ident">i32</span> <span class="op">+</span> <span class="ident">bounding_box</span>.<span class="ident">min</span>.<span class="ident">y</span>) <span class="kw">as</span> <span class="ident">usize</span>;
<span class="kw">if</span> <span class="ident">x</span> <span class="op">&lt;</span> <span class="ident">canvas</span>.<span class="ident">width</span> <span class="kw-2">&amp;</span><span class="op">&amp;</span> <span class="ident">y</span> <span class="op">&lt;</span> <span class="ident">canvas</span>.<span class="ident">height</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">color</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">color</span>;
<span class="ident">color</span>[<span class="number">0</span>] <span class="op">=</span> (<span class="ident">f32</span>::<span class="ident">from</span>(<span class="ident">color</span>[<span class="number">0</span>]) <span class="op">*</span> <span class="ident">v</span>) <span class="kw">as</span> <span class="ident">u8</span>;
<span class="ident">canvas</span>.<span class="ident">draw_point</span>(<span class="ident">x</span>, <span class="ident">y</span>, <span class="ident">color</span>);
}
});
}
}
}
<span class="doccomment">/// Calculates the width in pixels of the text</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_width</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">usize</span> {
<span class="kw">let</span> <span class="ident">glyphs</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw">_</span><span class="op">&gt;</span> <span class="op">=</span> <span class="self">self</span>
.<span class="ident">font</span>
.<span class="ident">layout</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">text</span>, <span class="self">self</span>.<span class="ident">scale</span>, <span class="ident">point</span>(<span class="number">0.0</span>, <span class="self">self</span>.<span class="ident">v_metrics</span>.<span class="ident">ascent</span>))
.<span class="ident">collect</span>();
<span class="kw">let</span> <span class="ident">min_x</span> <span class="op">=</span> <span class="ident">glyphs</span>
.<span class="ident">first</span>()
.<span class="ident">map</span>(<span class="op">|</span><span class="ident">g</span><span class="op">|</span> {
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">bb</span>) <span class="op">=</span> <span class="ident">g</span>.<span class="ident">pixel_bounding_box</span>() {
<span class="ident">bb</span>.<span class="ident">min</span>.<span class="ident">x</span>
} <span class="kw">else</span> {
<span class="ident">g</span>.<span class="ident">position</span>().<span class="ident">x</span> <span class="kw">as</span> <span class="ident">i32</span>
}
})
.<span class="ident">unwrap_or</span>(<span class="number">0</span>);
<span class="kw">let</span> <span class="ident">max_x</span> <span class="op">=</span> <span class="ident">glyphs</span>
.<span class="ident">last</span>()
.<span class="ident">map</span>(<span class="op">|</span><span class="ident">g</span><span class="op">|</span> {
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">bb</span>) <span class="op">=</span> <span class="ident">g</span>.<span class="ident">pixel_bounding_box</span>() {
<span class="ident">bb</span>.<span class="ident">max</span>.<span class="ident">x</span>
} <span class="kw">else</span> {
(<span class="ident">g</span>.<span class="ident">position</span>().<span class="ident">x</span> <span class="op">+</span> <span class="ident">g</span>.<span class="ident">unpositioned</span>().<span class="ident">h_metrics</span>().<span class="ident">advance_width</span>) <span class="kw">as</span> <span class="ident">i32</span>
}
})
.<span class="ident">unwrap_or</span>(<span class="number">0</span>);
(<span class="ident">max_x</span> <span class="op">-</span> <span class="ident">min_x</span>) <span class="kw">as</span> <span class="ident">usize</span>
}
}
<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> <span class="ident">Drawable</span> <span class="kw">for</span> <span class="ident">Text</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> {
<span class="kw">fn</span> <span class="ident">draw</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">canvas</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Canvas</span>) {
<span class="self">self</span>.<span class="ident">draw_text</span>(<span class="ident">canvas</span>);
}
}
</pre></div>
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