<!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 `geom/src/circle.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>circle.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='../../geom/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"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" disabled 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="kw">use</span> <span class="kw">crate</span>::{<span class="ident">Angle</span>, <span class="ident">Bounds</span>, <span class="ident">Distance</span>, <span class="ident">Polygon</span>, <span class="ident">Pt2D</span>, <span class="ident">Ring</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">std</span>::<span class="ident">fmt</span>;

<span class="kw">const</span> <span class="ident">TRIANGLES_PER_CIRCLE</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">60</span>;

<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Serialize</span>, <span class="ident">Deserialize</span>, <span class="ident">Debug</span>, <span class="ident">Clone</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Circle</span> {
    <span class="kw">pub</span> <span class="ident">center</span>: <span class="ident">Pt2D</span>,
    <span class="kw">pub</span> <span class="ident">radius</span>: <span class="ident">Distance</span>,
}

<span class="kw">impl</span> <span class="ident">Circle</span> {
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">center</span>: <span class="ident">Pt2D</span>, <span class="ident">radius</span>: <span class="ident">Distance</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Circle</span> {
        <span class="ident">Circle</span> { <span class="ident">center</span>, <span class="ident">radius</span> }
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">contains_pt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">pt</span>: <span class="ident">Pt2D</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">bool</span> {
        <span class="comment">// avoid sqrt by squaring radius instead</span>
        (<span class="ident">pt</span>.<span class="ident">x</span>() <span class="op">-</span> <span class="self">self</span>.<span class="ident">center</span>.<span class="ident">x</span>()).<span class="ident">powi</span>(<span class="number">2</span>) <span class="op">+</span> (<span class="ident">pt</span>.<span class="ident">y</span>() <span class="op">-</span> <span class="self">self</span>.<span class="ident">center</span>.<span class="ident">y</span>()).<span class="ident">powi</span>(<span class="number">2</span>)
            <span class="op">&lt;</span> <span class="self">self</span>.<span class="ident">radius</span>.<span class="ident">inner_meters</span>().<span class="ident">powi</span>(<span class="number">2</span>)
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_bounds</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Bounds</span> {
        <span class="ident">Bounds</span> {
            <span class="ident">min_x</span>: <span class="self">self</span>.<span class="ident">center</span>.<span class="ident">x</span>() <span class="op">-</span> <span class="self">self</span>.<span class="ident">radius</span>.<span class="ident">inner_meters</span>(),
            <span class="ident">max_x</span>: <span class="self">self</span>.<span class="ident">center</span>.<span class="ident">x</span>() <span class="op">+</span> <span class="self">self</span>.<span class="ident">radius</span>.<span class="ident">inner_meters</span>(),
            <span class="ident">min_y</span>: <span class="self">self</span>.<span class="ident">center</span>.<span class="ident">y</span>() <span class="op">-</span> <span class="self">self</span>.<span class="ident">radius</span>.<span class="ident">inner_meters</span>(),
            <span class="ident">max_y</span>: <span class="self">self</span>.<span class="ident">center</span>.<span class="ident">y</span>() <span class="op">+</span> <span class="self">self</span>.<span class="ident">radius</span>.<span class="ident">inner_meters</span>(),
        }
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_polygon</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Polygon</span> {
        <span class="self">self</span>.<span class="ident">to_partial_polygon</span>(<span class="number">1.0</span>)
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_partial_polygon</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">percent_full</span>: <span class="ident">f64</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Polygon</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">pts</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[<span class="self">self</span>.<span class="ident">center</span>];
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">indices</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
        <span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">TRIANGLES_PER_CIRCLE</span> {
            <span class="ident">pts</span>.<span class="ident">push</span>(<span class="self">self</span>.<span class="ident">center</span>.<span class="ident">project_away</span>(
                <span class="self">self</span>.<span class="ident">radius</span>,
                <span class="ident">Angle</span>::<span class="ident">new_degs</span>((<span class="ident">i</span> <span class="kw">as</span> <span class="ident">f64</span>) <span class="op">/</span> (<span class="ident">TRIANGLES_PER_CIRCLE</span> <span class="kw">as</span> <span class="ident">f64</span>) <span class="op">*</span> <span class="ident">percent_full</span> <span class="op">*</span> <span class="number">360.0</span>),
            ));
            <span class="ident">indices</span>.<span class="ident">push</span>(<span class="number">0</span>);
            <span class="ident">indices</span>.<span class="ident">push</span>(<span class="ident">i</span> <span class="op">+</span> <span class="number">1</span>);
            <span class="kw">if</span> <span class="ident">i</span> <span class="op">!</span><span class="op">=</span> <span class="ident">TRIANGLES_PER_CIRCLE</span> <span class="op">-</span> <span class="number">1</span> {
                <span class="ident">indices</span>.<span class="ident">push</span>(<span class="ident">i</span> <span class="op">+</span> <span class="number">2</span>);
            } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">percent_full</span> <span class="op">=</span><span class="op">=</span> <span class="number">1.0</span> {
                <span class="ident">indices</span>.<span class="ident">push</span>(<span class="number">1</span>);
            } <span class="kw">else</span> {
                <span class="ident">indices</span>.<span class="ident">pop</span>();
                <span class="ident">indices</span>.<span class="ident">pop</span>();
            }
        }
        <span class="ident">Polygon</span>::<span class="ident">precomputed</span>(<span class="ident">pts</span>, <span class="ident">indices</span>)
    }

    <span class="kw">fn</span> <span class="ident">to_ring</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Ring</span> {
        <span class="ident">Ring</span>::<span class="ident">must_new</span>(
            (<span class="number">0</span>..<span class="op">=</span><span class="ident">TRIANGLES_PER_CIRCLE</span>)
                .<span class="ident">map</span>(<span class="op">|</span><span class="ident">i</span><span class="op">|</span> {
                    <span class="self">self</span>.<span class="ident">center</span>.<span class="ident">project_away</span>(
                        <span class="self">self</span>.<span class="ident">radius</span>,
                        <span class="ident">Angle</span>::<span class="ident">new_degs</span>((<span class="ident">i</span> <span class="kw">as</span> <span class="ident">f64</span>) <span class="op">/</span> (<span class="ident">TRIANGLES_PER_CIRCLE</span> <span class="kw">as</span> <span class="ident">f64</span>) <span class="op">*</span> <span class="number">360.0</span>),
                    )
                })
                .<span class="ident">collect</span>(),
        )
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">outline</span>(<span class="ident">center</span>: <span class="ident">Pt2D</span>, <span class="ident">radius</span>: <span class="ident">Distance</span>, <span class="ident">thickness</span>: <span class="ident">Distance</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Polygon</span>, <span class="ident">String</span><span class="op">&gt;</span> {
        <span class="kw">if</span> <span class="ident">radius</span> <span class="op">&lt;</span><span class="op">=</span> <span class="ident">thickness</span> {
            <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="macro">format</span><span class="macro">!</span>(
                <span class="string">&quot;Can&#39;t make Circle outline with radius {} and thickness {}&quot;</span>,
                <span class="ident">radius</span>, <span class="ident">thickness</span>
            ));
        }

        <span class="kw">let</span> <span class="ident">bigger</span> <span class="op">=</span> <span class="ident">Circle</span>::<span class="ident">new</span>(<span class="ident">center</span>, <span class="ident">radius</span>).<span class="ident">to_ring</span>();
        <span class="kw">let</span> <span class="ident">smaller</span> <span class="op">=</span> <span class="ident">Circle</span>::<span class="ident">new</span>(<span class="ident">center</span>, <span class="ident">radius</span> <span class="op">-</span> <span class="ident">thickness</span>).<span class="ident">to_ring</span>();
        <span class="prelude-val">Ok</span>(<span class="ident">Polygon</span>::<span class="ident">with_holes</span>(<span class="ident">bigger</span>, <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">smaller</span>]))
    }
}

<span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Display</span> <span class="kw">for</span> <span class="ident">Circle</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;</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
        <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">&quot;Circle({}, {})&quot;</span>, <span class="self">self</span>.<span class="ident">center</span>, <span class="self">self</span>.<span class="ident">radius</span>)
    }
}
</pre></div>
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