<!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 `widgetry&#x2F;src&#x2F;tools&#x2F;warper.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>warper.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><script src="../../../crates.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../../favicon.svg"><style type="text/css">#crate-search{background-image:url("../../../down-arrow.svg");}</style></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu" role="button">&#9776;</div><a href='../../../widgetry/index.html'><div class='logo-container rust-logo'><img src='../../../rust-logo.png' alt='logo'></div></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu" title="themes"><img width="18" height="18" alt="Pick another theme!" src="../../../brush.svg"></button><div id="theme-choices" role="menu"></div></div><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><button type="button" id="help-button" title="help">?</button><a id="settings-menu" href="../../../settings.html" title="settings"><img width="18" height="18" alt="Change settings" src="../../../wheel.svg"></a></div></form></nav><section id="main" class="content"><div class="example-wrap"><pre class="line-numbers"><span id="1"> 1</span>
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</pre><pre class="rust"><code><span class="kw">use</span> <span class="ident">instant::Instant</span>;

<span class="kw">use</span> <span class="ident">geom</span>::{<span class="ident">Line</span>, <span class="ident">Pt2D</span>};

<span class="kw">use</span> <span class="kw">crate</span>::{<span class="ident">EventCtx</span>, <span class="ident">UpdateType</span>};

<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Warper</span> {
    <span class="ident">started</span>: <span class="ident">Instant</span>,
    <span class="ident">line</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Line</span><span class="op">&gt;</span>,
    <span class="ident">cam_zoom</span>: (<span class="ident">f64</span>, <span class="ident">f64</span>),
}

<span class="kw">impl</span> <span class="ident">Warper</span> {
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">ctx</span>: <span class="kw-2">&amp;</span><span class="ident">EventCtx</span>, <span class="ident">pt</span>: <span class="ident">Pt2D</span>, <span class="ident">target_cam_zoom</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">f64</span><span class="op">&gt;</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Warper</span> {
        <span class="kw">let</span> <span class="ident">z</span> <span class="op">=</span> <span class="ident">ctx</span>.<span class="ident">canvas</span>.<span class="ident">cam_zoom</span>;
        <span class="ident">Warper</span> {
            <span class="ident">started</span>: <span class="ident">Instant::now</span>(),
            <span class="ident">line</span>: <span class="ident">Line::new</span>(<span class="ident">ctx</span>.<span class="ident">canvas</span>.<span class="ident">center_to_map_pt</span>(), <span class="ident">pt</span>),
            <span class="ident">cam_zoom</span>: (<span class="ident">z</span>, <span class="ident">target_cam_zoom</span>.<span class="ident">unwrap_or</span>(<span class="ident">z</span>)),
        }
    }

    <span class="comment">// false means done</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">event</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">ctx</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">EventCtx</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">bool</span> {
        <span class="comment">// Actually nothing for us to do</span>
        <span class="attribute">#[<span class="ident">allow</span>(<span class="ident">clippy::float_cmp</span>)]</span>
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">line</span>.<span class="ident">is_none</span>() <span class="op">&amp;&amp;</span> <span class="self">self</span>.<span class="ident">cam_zoom</span>.<span class="number">0</span> <span class="op">=</span><span class="op">=</span> <span class="self">self</span>.<span class="ident">cam_zoom</span>.<span class="number">1</span> {
            <span class="kw">return</span> <span class="bool-val">false</span>;
        }

        <span class="comment">// Weird to do stuff for any event?</span>
        <span class="kw">if</span> <span class="ident">ctx</span>.<span class="ident">input</span>.<span class="ident">nonblocking_is_update_event</span>().<span class="ident">is_none</span>() {
            <span class="ident">ctx</span>.<span class="ident">request_update</span>(<span class="ident">UpdateType::Game</span>);
            <span class="kw">return</span> <span class="bool-val">true</span>;
        }
        <span class="ident">ctx</span>.<span class="ident">input</span>.<span class="ident">use_update_event</span>();

        <span class="kw">const</span> <span class="ident">MAX_ANIMATION_TIME_S</span>: <span class="ident">f64</span> <span class="op">=</span> <span class="number">0.5</span>;
        <span class="kw">const</span> <span class="ident">ANIMATION_SPEED</span>: <span class="ident">f64</span> <span class="op">=</span> <span class="number">200.0</span>;
        <span class="kw">let</span> <span class="ident">total_time</span> <span class="op">=</span> <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="kw-2">ref</span> <span class="ident">line</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">line</span> {
            (<span class="ident">line</span>.<span class="ident">length</span>().<span class="ident">inner_meters</span>() <span class="op">/</span> <span class="ident">ANIMATION_SPEED</span>).<span class="ident">min</span>(<span class="ident">MAX_ANIMATION_TIME_S</span>)
        } <span class="kw">else</span> {
            <span class="ident">MAX_ANIMATION_TIME_S</span>
        };
        <span class="kw">let</span> <span class="ident">percent</span> <span class="op">=</span> <span class="ident">abstutil::elapsed_seconds</span>(<span class="self">self</span>.<span class="ident">started</span>) <span class="op">/</span> <span class="ident">total_time</span>;

        <span class="kw">let</span> <span class="ident">orig_center</span> <span class="op">=</span> <span class="ident">ctx</span>.<span class="ident">canvas</span>.<span class="ident">center_to_map_pt</span>();
        <span class="kw">if</span> <span class="ident">percent</span> <span class="op">&gt;</span><span class="op">=</span> <span class="number">1.0</span> <span class="op">|</span><span class="op">|</span> <span class="ident">ctx</span>.<span class="ident">input</span>.<span class="ident">any_pressed</span>().<span class="ident">is_some</span>() {
            <span class="ident">ctx</span>.<span class="ident">canvas</span>.<span class="ident">cam_zoom</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">cam_zoom</span>.<span class="number">1</span>;
            <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="kw-2">ref</span> <span class="ident">line</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">line</span> {
                <span class="ident">ctx</span>.<span class="ident">canvas</span>.<span class="ident">center_on_map_pt</span>(<span class="ident">line</span>.<span class="ident">pt2</span>());
            } <span class="kw">else</span> {
                <span class="ident">ctx</span>.<span class="ident">canvas</span>.<span class="ident">center_on_map_pt</span>(<span class="ident">orig_center</span>);
            }
            <span class="bool-val">false</span>
        } <span class="kw">else</span> {
            <span class="ident">ctx</span>.<span class="ident">canvas</span>.<span class="ident">cam_zoom</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">cam_zoom</span>.<span class="number">0</span> <span class="op">+</span> <span class="ident">percent</span> <span class="op">*</span> (<span class="self">self</span>.<span class="ident">cam_zoom</span>.<span class="number">1</span> <span class="op">-</span> <span class="self">self</span>.<span class="ident">cam_zoom</span>.<span class="number">0</span>);
            <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="kw-2">ref</span> <span class="ident">line</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">line</span> {
                <span class="ident">ctx</span>.<span class="ident">canvas</span>
                    .<span class="ident">center_on_map_pt</span>(<span class="ident">line</span>.<span class="ident">percent_along</span>(<span class="ident">percent</span>).<span class="ident">unwrap</span>());
            } <span class="kw">else</span> {
                <span class="ident">ctx</span>.<span class="ident">canvas</span>.<span class="ident">center_on_map_pt</span>(<span class="ident">orig_center</span>);
            }
            <span class="ident">ctx</span>.<span class="ident">request_update</span>(<span class="ident">UpdateType::Game</span>);
            <span class="bool-val">true</span>
        }
    }
}
</code></pre></div>
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