<!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/src/canvas.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>canvas.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><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="../../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../../dark.css" disabled><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.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"></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="mobile-topbar"><button class="sidebar-menu-toggle">&#9776;</button><a class="sidebar-logo" href="../../widgetry/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><h2 class="location"></h2></nav><nav class="sidebar"><a class="sidebar-logo" href="../../widgetry/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../../widgetry/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><nav class="sub"><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><button type="button">?</button></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav></div><section id="main-content" 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">std::cell::RefCell</span>;
<span class="kw">use</span> <span class="ident">std::collections::HashSet</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">geom</span>::{<span class="ident">Bounds</span>, <span class="ident">Pt2D</span>};

<span class="kw">use</span> <span class="kw">crate</span>::{<span class="ident">Key</span>, <span class="ident">ScreenDims</span>, <span class="ident">ScreenPt</span>, <span class="ident">ScreenRectangle</span>, <span class="ident">UpdateType</span>, <span class="ident">UserInput</span>};

<span class="comment">// Click and release counts as a normal click, not a drag, if the distance between click and</span>
<span class="comment">// release is less than this.</span>
<span class="kw">const</span> <span class="ident">DRAG_THRESHOLD</span>: <span class="ident">f64</span> <span class="op">=</span> <span class="number">5.0</span>;

<span class="kw">const</span> <span class="ident">PAN_SPEED</span>: <span class="ident">f64</span> <span class="op">=</span> <span class="number">15.0</span>;

<span class="kw">const</span> <span class="ident">PANNING_THRESHOLD</span>: <span class="ident">f64</span> <span class="op">=</span> <span class="number">25.0</span>;

<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Canvas</span> {
    <span class="comment">// All of these f64&#39;s are in screen-space, so do NOT use Pt2D.</span>
    <span class="comment">// Public for saving/loading... should probably do better</span>
    <span class="kw">pub</span> <span class="ident">cam_x</span>: <span class="ident">f64</span>,
    <span class="kw">pub</span> <span class="ident">cam_y</span>: <span class="ident">f64</span>,
    <span class="kw">pub</span> <span class="ident">cam_zoom</span>: <span class="ident">f64</span>,

    <span class="comment">// TODO Should this become Option&lt;ScreenPt&gt;?</span>
    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="ident">cursor</span>: <span class="ident">ScreenPt</span>,
    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="ident">window_has_cursor</span>: <span class="ident">bool</span>,

    <span class="comment">// Only for drags starting on the map. Only used to pan the map. (Last event, original)</span>
    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="ident">drag_canvas_from</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span>(<span class="ident">ScreenPt</span>, <span class="ident">ScreenPt</span>)<span class="op">&gt;</span>,
    <span class="ident">drag_just_ended</span>: <span class="ident">bool</span>,

    <span class="kw">pub</span> <span class="ident">window_width</span>: <span class="ident">f64</span>,
    <span class="kw">pub</span> <span class="ident">window_height</span>: <span class="ident">f64</span>,

    <span class="comment">// TODO Proper API for setting these</span>
    <span class="kw">pub</span> <span class="ident">map_dims</span>: (<span class="ident">f64</span>, <span class="ident">f64</span>),
    <span class="kw">pub</span> <span class="ident">settings</span>: <span class="ident">CanvasSettings</span>,

    <span class="comment">// TODO Bit weird and hacky to mutate inside of draw() calls.</span>
    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="ident">covered_areas</span>: <span class="ident">RefCell</span><span class="op">&lt;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">ScreenRectangle</span><span class="op">&gt;</span><span class="op">&gt;</span>,

    <span class="comment">// Kind of just widgetry state awkwardly stuck here...</span>
    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="ident">keys_held</span>: <span class="ident">HashSet</span><span class="op">&lt;</span><span class="ident">Key</span><span class="op">&gt;</span>,
}

<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Serialize</span>, <span class="ident">Deserialize</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">CanvasSettings</span> {
    <span class="kw">pub</span> <span class="ident">invert_scroll</span>: <span class="ident">bool</span>,
    <span class="kw">pub</span> <span class="ident">touchpad_to_move</span>: <span class="ident">bool</span>,
    <span class="kw">pub</span> <span class="ident">edge_auto_panning</span>: <span class="ident">bool</span>,
    <span class="kw">pub</span> <span class="ident">keys_to_pan</span>: <span class="ident">bool</span>,
    <span class="kw">pub</span> <span class="ident">gui_scroll_speed</span>: <span class="ident">usize</span>,
    <span class="comment">// TODO Ideally this would be an f64, but elsewhere we use it in a Spinner. Until we override</span>
    <span class="comment">// the Display trait to do some rounding, floating point increments render pretty horribly.</span>
    <span class="kw">pub</span> <span class="ident">canvas_scroll_speed</span>: <span class="ident">usize</span>,
    <span class="doccomment">/// Some map-space elements are drawn differently when unzoomed and zoomed. This specifies the canvas</span>
    <span class="doccomment">/// zoom level where they switch. The concept of &quot;unzoomed&quot; and &quot;zoomed&quot; is used by</span>
    <span class="doccomment">/// `ToggleZoomed`.</span>
    <span class="kw">pub</span> <span class="ident">min_zoom_for_detail</span>: <span class="ident">f64</span>,
}

<span class="kw">impl</span> <span class="ident">CanvasSettings</span> {
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>() -&gt; <span class="ident">CanvasSettings</span> {
        <span class="ident">CanvasSettings</span> {
            <span class="ident">invert_scroll</span>: <span class="bool-val">false</span>,
            <span class="ident">touchpad_to_move</span>: <span class="bool-val">false</span>,
            <span class="ident">edge_auto_panning</span>: <span class="bool-val">false</span>,
            <span class="ident">keys_to_pan</span>: <span class="bool-val">false</span>,
            <span class="ident">gui_scroll_speed</span>: <span class="number">5</span>,
            <span class="ident">canvas_scroll_speed</span>: <span class="number">10</span>,
            <span class="ident">min_zoom_for_detail</span>: <span class="number">4.0</span>,
        }
    }
}

<span class="kw">impl</span> <span class="ident">Canvas</span> {
    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">initial_dims</span>: <span class="ident">ScreenDims</span>, <span class="ident">settings</span>: <span class="ident">CanvasSettings</span>) -&gt; <span class="ident">Canvas</span> {
        <span class="ident">Canvas</span> {
            <span class="ident">cam_x</span>: <span class="number">0.0</span>,
            <span class="ident">cam_y</span>: <span class="number">0.0</span>,
            <span class="ident">cam_zoom</span>: <span class="number">1.0</span>,

            <span class="ident">cursor</span>: <span class="ident">ScreenPt::new</span>(<span class="number">0.0</span>, <span class="number">0.0</span>),
            <span class="ident">window_has_cursor</span>: <span class="bool-val">true</span>,

            <span class="ident">drag_canvas_from</span>: <span class="prelude-val">None</span>,
            <span class="ident">drag_just_ended</span>: <span class="bool-val">false</span>,

            <span class="ident">window_width</span>: <span class="ident">initial_dims</span>.<span class="ident">width</span>,
            <span class="ident">window_height</span>: <span class="ident">initial_dims</span>.<span class="ident">height</span>,

            <span class="ident">map_dims</span>: (<span class="number">0.0</span>, <span class="number">0.0</span>),
            <span class="ident">settings</span>,

            <span class="ident">covered_areas</span>: <span class="ident">RefCell::new</span>(<span class="ident">Vec::new</span>()),

            <span class="ident">keys_held</span>: <span class="ident">HashSet::new</span>(),
        }
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">max_zoom</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="ident">f64</span> {
        <span class="number">50.0</span>
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">min_zoom</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="ident">f64</span> {
        <span class="kw">let</span> <span class="ident">percent_window</span> <span class="op">=</span> <span class="number">0.8</span>;
        (<span class="ident">percent_window</span> <span class="op">*</span> <span class="self">self</span>.<span class="ident">window_width</span> <span class="op">/</span> <span class="self">self</span>.<span class="ident">map_dims</span>.<span class="number">0</span>)
            .<span class="ident">min</span>(<span class="ident">percent_window</span> <span class="op">*</span> <span class="self">self</span>.<span class="ident">window_height</span> <span class="op">/</span> <span class="self">self</span>.<span class="ident">map_dims</span>.<span class="number">1</span>)
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_max_zoom</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="ident">bool</span> {
        <span class="self">self</span>.<span class="ident">cam_zoom</span> <span class="op">&gt;</span><span class="op">=</span> <span class="self">self</span>.<span class="ident">max_zoom</span>()
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_min_zoom</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="ident">bool</span> {
        <span class="self">self</span>.<span class="ident">cam_zoom</span> <span class="op">&lt;</span><span class="op">=</span> <span class="self">self</span>.<span class="ident">min_zoom</span>()
    }

    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">handle_event</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>, <span class="ident">input</span>: <span class="kw-2">&amp;mut</span> <span class="ident">UserInput</span>) -&gt; <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">UpdateType</span><span class="op">&gt;</span> {
        <span class="comment">// Can&#39;t start dragging or zooming on top of covered area</span>
        <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">map_pt</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">get_cursor_in_map_space</span>() {
            <span class="kw">if</span> <span class="self">self</span>.<span class="ident">settings</span>.<span class="ident">touchpad_to_move</span> {
                <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>((<span class="ident">scroll_x</span>, <span class="ident">scroll_y</span>)) <span class="op">=</span> <span class="ident">input</span>.<span class="ident">get_mouse_scroll</span>() {
                    <span class="kw">if</span> <span class="self">self</span>.<span class="ident">keys_held</span>.<span class="ident">contains</span>(<span class="kw-2">&amp;</span><span class="ident">Key::LeftControl</span>) {
                        <span class="self">self</span>.<span class="ident">zoom</span>(<span class="ident">scroll_y</span>, <span class="self">self</span>.<span class="ident">cursor</span>);
                    } <span class="kw">else</span> {
                        <span class="comment">// Woo, inversion is different for the two. :P</span>
                        <span class="self">self</span>.<span class="ident">cam_x</span> <span class="op">+</span><span class="op">=</span> <span class="ident">scroll_x</span> <span class="op">*</span> <span class="ident">PAN_SPEED</span>;
                        <span class="self">self</span>.<span class="ident">cam_y</span> <span class="op">-</span><span class="op">=</span> <span class="ident">scroll_y</span> <span class="op">*</span> <span class="ident">PAN_SPEED</span>;
                    }
                }
            } <span class="kw">else</span> {
                <span class="kw">if</span> <span class="ident">input</span>.<span class="ident">left_mouse_button_pressed</span>() {
                    <span class="self">self</span>.<span class="ident">drag_canvas_from</span> <span class="op">=</span> <span class="prelude-val">Some</span>((<span class="self">self</span>.<span class="ident">get_cursor</span>(), <span class="self">self</span>.<span class="ident">get_cursor</span>()));
                }

                <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>((<span class="kw">_</span>, <span class="ident">scroll</span>)) <span class="op">=</span> <span class="ident">input</span>.<span class="ident">get_mouse_scroll</span>() {
                    <span class="self">self</span>.<span class="ident">zoom</span>(<span class="ident">scroll</span>, <span class="self">self</span>.<span class="ident">cursor</span>);
                }
            }

            <span class="kw">if</span> <span class="self">self</span>.<span class="ident">settings</span>.<span class="ident">keys_to_pan</span> {
                <span class="kw">if</span> <span class="ident">input</span>.<span class="ident">pressed</span>(<span class="ident">Key::LeftArrow</span>) {
                    <span class="self">self</span>.<span class="ident">cam_x</span> <span class="op">-</span><span class="op">=</span> <span class="ident">PAN_SPEED</span>;
                }
                <span class="kw">if</span> <span class="ident">input</span>.<span class="ident">pressed</span>(<span class="ident">Key::RightArrow</span>) {
                    <span class="self">self</span>.<span class="ident">cam_x</span> <span class="op">+</span><span class="op">=</span> <span class="ident">PAN_SPEED</span>;
                }
                <span class="kw">if</span> <span class="ident">input</span>.<span class="ident">pressed</span>(<span class="ident">Key::UpArrow</span>) {
                    <span class="self">self</span>.<span class="ident">cam_y</span> <span class="op">-</span><span class="op">=</span> <span class="ident">PAN_SPEED</span>;
                }
                <span class="kw">if</span> <span class="ident">input</span>.<span class="ident">pressed</span>(<span class="ident">Key::DownArrow</span>) {
                    <span class="self">self</span>.<span class="ident">cam_y</span> <span class="op">+</span><span class="op">=</span> <span class="ident">PAN_SPEED</span>;
                }
                <span class="kw">if</span> <span class="ident">input</span>.<span class="ident">pressed</span>(<span class="ident">Key::Q</span>) {
                    <span class="self">self</span>.<span class="ident">zoom</span>(
                        <span class="number">1.0</span>,
                        <span class="ident">ScreenPt::new</span>(<span class="self">self</span>.<span class="ident">window_width</span> <span class="op">/</span> <span class="number">2.0</span>, <span class="self">self</span>.<span class="ident">window_height</span> <span class="op">/</span> <span class="number">2.0</span>),
                    );
                }
                <span class="kw">if</span> <span class="ident">input</span>.<span class="ident">pressed</span>(<span class="ident">Key::W</span>) {
                    <span class="self">self</span>.<span class="ident">zoom</span>(
                        <span class="op">-</span><span class="number">1.0</span>,
                        <span class="ident">ScreenPt::new</span>(<span class="self">self</span>.<span class="ident">window_width</span> <span class="op">/</span> <span class="number">2.0</span>, <span class="self">self</span>.<span class="ident">window_height</span> <span class="op">/</span> <span class="number">2.0</span>),
                    );
                }
            }

            <span class="kw">if</span> <span class="ident">input</span>.<span class="ident">left_mouse_double_clicked</span>() {
                <span class="self">self</span>.<span class="ident">zoom</span>(<span class="number">8.0</span>, <span class="self">self</span>.<span class="ident">map_to_screen</span>(<span class="ident">map_pt</span>));
            }
        }

        <span class="comment">// If we start the drag on the map and move the mouse off the map, keep dragging.</span>
        <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>((<span class="ident">click</span>, <span class="ident">orig</span>)) <span class="op">=</span> <span class="self">self</span>.<span class="ident">drag_canvas_from</span> {
            <span class="kw">let</span> <span class="ident">pt</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">get_cursor</span>();
            <span class="self">self</span>.<span class="ident">cam_x</span> <span class="op">+</span><span class="op">=</span> <span class="ident">click</span>.<span class="ident">x</span> <span class="op">-</span> <span class="ident">pt</span>.<span class="ident">x</span>;
            <span class="self">self</span>.<span class="ident">cam_y</span> <span class="op">+</span><span class="op">=</span> <span class="ident">click</span>.<span class="ident">y</span> <span class="op">-</span> <span class="ident">pt</span>.<span class="ident">y</span>;
            <span class="self">self</span>.<span class="ident">drag_canvas_from</span> <span class="op">=</span> <span class="prelude-val">Some</span>((<span class="ident">pt</span>, <span class="ident">orig</span>));

            <span class="kw">if</span> <span class="ident">input</span>.<span class="ident">left_mouse_button_released</span>() {
                <span class="kw">let</span> (<span class="kw">_</span>, <span class="ident">orig</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">drag_canvas_from</span>.<span class="ident">take</span>().<span class="ident">unwrap</span>();
                <span class="kw">let</span> <span class="ident">dist</span> <span class="op">=</span> ((<span class="ident">pt</span>.<span class="ident">x</span> <span class="op">-</span> <span class="ident">orig</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="ident">orig</span>.<span class="ident">y</span>).<span class="ident">powi</span>(<span class="number">2</span>)).<span class="ident">sqrt</span>();
                <span class="kw">if</span> <span class="ident">dist</span> <span class="op">&gt;</span> <span class="ident">DRAG_THRESHOLD</span> {
                    <span class="self">self</span>.<span class="ident">drag_just_ended</span> <span class="op">=</span> <span class="bool-val">true</span>;
                }
            }
        } <span class="kw">else</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">drag_just_ended</span> {
            <span class="self">self</span>.<span class="ident">drag_just_ended</span> <span class="op">=</span> <span class="bool-val">false</span>;
        } <span class="kw">else</span> {
            <span class="kw">let</span> <span class="ident">cursor_screen_pt</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">get_cursor</span>().<span class="ident">to_pt</span>();
            <span class="kw">let</span> <span class="ident">cursor_map_pt</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">screen_to_map</span>(<span class="self">self</span>.<span class="ident">get_cursor</span>());
            <span class="kw">let</span> <span class="ident">inner_bounds</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">get_inner_bounds</span>();
            <span class="kw">let</span> <span class="ident">map_bounds</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">get_map_bounds</span>();
            <span class="kw">if</span> <span class="self">self</span>.<span class="ident">settings</span>.<span class="ident">edge_auto_panning</span>
                <span class="op">&amp;&amp;</span> <span class="op">!</span><span class="ident">inner_bounds</span>.<span class="ident">contains</span>(<span class="ident">cursor_screen_pt</span>)
                <span class="op">&amp;&amp;</span> <span class="ident">map_bounds</span>.<span class="ident">contains</span>(<span class="ident">cursor_map_pt</span>)
                <span class="op">&amp;&amp;</span> <span class="ident">input</span>.<span class="ident">nonblocking_is_update_event</span>().<span class="ident">is_some</span>()
            {
                <span class="kw">let</span> <span class="ident">center_pt</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">center_to_screen_pt</span>().<span class="ident">to_pt</span>();
                <span class="kw">let</span> <span class="ident">displacement_x</span> <span class="op">=</span> <span class="ident">cursor_screen_pt</span>.<span class="ident">x</span>() <span class="op">-</span> <span class="ident">center_pt</span>.<span class="ident">x</span>();
                <span class="kw">let</span> <span class="ident">displacement_y</span> <span class="op">=</span> <span class="ident">cursor_screen_pt</span>.<span class="ident">y</span>() <span class="op">-</span> <span class="ident">center_pt</span>.<span class="ident">y</span>();
                <span class="kw">let</span> <span class="ident">displacement_magnitude</span> <span class="op">=</span>
                    <span class="ident">f64::sqrt</span>(<span class="ident">displacement_x</span>.<span class="ident">powf</span>(<span class="number">2.0</span>) <span class="op">+</span> <span class="ident">displacement_y</span>.<span class="ident">powf</span>(<span class="number">2.0</span>));
                <span class="kw">let</span> <span class="ident">displacement_unit_x</span> <span class="op">=</span> <span class="ident">displacement_x</span> <span class="op">/</span> <span class="ident">displacement_magnitude</span>;
                <span class="kw">let</span> <span class="ident">displacement_unit_y</span> <span class="op">=</span> <span class="ident">displacement_y</span> <span class="op">/</span> <span class="ident">displacement_magnitude</span>;
                <span class="comment">// Add displacement along each axis</span>
                <span class="self">self</span>.<span class="ident">cam_x</span> <span class="op">+</span><span class="op">=</span> <span class="ident">displacement_unit_x</span> <span class="op">*</span> <span class="ident">PAN_SPEED</span>;
                <span class="self">self</span>.<span class="ident">cam_y</span> <span class="op">+</span><span class="op">=</span> <span class="ident">displacement_unit_y</span> <span class="op">*</span> <span class="ident">PAN_SPEED</span>;
                <span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="ident">UpdateType::Pan</span>);
            }
        }
        <span class="prelude-val">None</span>
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">center_zoom</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>, <span class="ident">delta</span>: <span class="ident">f64</span>) {
        <span class="self">self</span>.<span class="ident">zoom</span>(<span class="ident">delta</span>, <span class="self">self</span>.<span class="ident">center_to_screen_pt</span>())
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">zoom</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>, <span class="ident">delta</span>: <span class="ident">f64</span>, <span class="ident">focus</span>: <span class="ident">ScreenPt</span>) {
        <span class="kw">let</span> <span class="ident">old_zoom</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">cam_zoom</span>;
        <span class="comment">// By popular request, some limits ;)</span>
        <span class="self">self</span>.<span class="ident">cam_zoom</span> <span class="op">=</span> <span class="number">1.1_f64</span>
            .<span class="ident">powf</span>(<span class="ident">old_zoom</span>.<span class="ident">log</span>(<span class="number">1.1</span>) <span class="op">+</span> <span class="ident">delta</span> <span class="op">*</span> (<span class="self">self</span>.<span class="ident">settings</span>.<span class="ident">canvas_scroll_speed</span> <span class="kw">as</span> <span class="ident">f64</span> <span class="op">/</span> <span class="number">10.0</span>))
            .<span class="ident">max</span>(<span class="self">self</span>.<span class="ident">min_zoom</span>())
            .<span class="ident">min</span>(<span class="self">self</span>.<span class="ident">max_zoom</span>());

        <span class="comment">// Make screen_to_map of the focus point still point to the same thing after</span>
        <span class="comment">// zooming.</span>
        <span class="self">self</span>.<span class="ident">cam_x</span> <span class="op">=</span> ((<span class="self">self</span>.<span class="ident">cam_zoom</span> <span class="op">/</span> <span class="ident">old_zoom</span>) <span class="op">*</span> (<span class="ident">focus</span>.<span class="ident">x</span> <span class="op">+</span> <span class="self">self</span>.<span class="ident">cam_x</span>)) <span class="op">-</span> <span class="ident">focus</span>.<span class="ident">x</span>;
        <span class="self">self</span>.<span class="ident">cam_y</span> <span class="op">=</span> ((<span class="self">self</span>.<span class="ident">cam_zoom</span> <span class="op">/</span> <span class="ident">old_zoom</span>) <span class="op">*</span> (<span class="ident">focus</span>.<span class="ident">y</span> <span class="op">+</span> <span class="self">self</span>.<span class="ident">cam_y</span>)) <span class="op">-</span> <span class="ident">focus</span>.<span class="ident">y</span>;
    }

    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">start_drawing</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) {
        <span class="self">self</span>.<span class="ident">covered_areas</span>.<span class="ident">borrow_mut</span>().<span class="ident">clear</span>();
    }

    <span class="comment">// TODO Only public for the OSD. :(</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">mark_covered_area</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">rect</span>: <span class="ident">ScreenRectangle</span>) {
        <span class="self">self</span>.<span class="ident">covered_areas</span>.<span class="ident">borrow_mut</span>().<span class="ident">push</span>(<span class="ident">rect</span>);
    }

    <span class="comment">// Might be hovering anywhere.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_cursor</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="ident">ScreenPt</span> {
        <span class="self">self</span>.<span class="ident">cursor</span>
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_cursor_in_screen_space</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">ScreenPt</span><span class="op">&gt;</span> {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">window_has_cursor</span> <span class="op">&amp;&amp;</span> <span class="self">self</span>.<span class="ident">get_cursor_in_map_space</span>().<span class="ident">is_none</span>() {
            <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">get_cursor</span>())
        } <span class="kw">else</span> {
            <span class="prelude-val">None</span>
        }
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_cursor_in_map_space</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Pt2D</span><span class="op">&gt;</span> {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">window_has_cursor</span> {
            <span class="kw">let</span> <span class="ident">pt</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">get_cursor</span>();

            <span class="kw">for</span> <span class="ident">rect</span> <span class="kw">in</span> <span class="self">self</span>.<span class="ident">covered_areas</span>.<span class="ident">borrow</span>().<span class="ident">iter</span>() {
                <span class="kw">if</span> <span class="ident">rect</span>.<span class="ident">contains</span>(<span class="ident">pt</span>) {
                    <span class="kw">return</span> <span class="prelude-val">None</span>;
                }
            }

            <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">screen_to_map</span>(<span class="ident">pt</span>))
        } <span class="kw">else</span> {
            <span class="prelude-val">None</span>
        }
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">screen_to_map</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">pt</span>: <span class="ident">ScreenPt</span>) -&gt; <span class="ident">Pt2D</span> {
        <span class="ident">Pt2D::new</span>(
            (<span class="ident">pt</span>.<span class="ident">x</span> <span class="op">+</span> <span class="self">self</span>.<span class="ident">cam_x</span>) <span class="op">/</span> <span class="self">self</span>.<span class="ident">cam_zoom</span>,
            (<span class="ident">pt</span>.<span class="ident">y</span> <span class="op">+</span> <span class="self">self</span>.<span class="ident">cam_y</span>) <span class="op">/</span> <span class="self">self</span>.<span class="ident">cam_zoom</span>,
        )
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">center_to_screen_pt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="ident">ScreenPt</span> {
        <span class="ident">ScreenPt::new</span>(<span class="self">self</span>.<span class="ident">window_width</span> <span class="op">/</span> <span class="number">2.0</span>, <span class="self">self</span>.<span class="ident">window_height</span> <span class="op">/</span> <span class="number">2.0</span>)
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">center_to_map_pt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="ident">Pt2D</span> {
        <span class="self">self</span>.<span class="ident">screen_to_map</span>(<span class="self">self</span>.<span class="ident">center_to_screen_pt</span>())
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">center_on_map_pt</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>, <span class="ident">pt</span>: <span class="ident">Pt2D</span>) {
        <span class="self">self</span>.<span class="ident">cam_x</span> <span class="op">=</span> (<span class="ident">pt</span>.<span class="ident">x</span>() <span class="op">*</span> <span class="self">self</span>.<span class="ident">cam_zoom</span>) <span class="op">-</span> (<span class="self">self</span>.<span class="ident">window_width</span> <span class="op">/</span> <span class="number">2.0</span>);
        <span class="self">self</span>.<span class="ident">cam_y</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">cam_zoom</span>) <span class="op">-</span> (<span class="self">self</span>.<span class="ident">window_height</span> <span class="op">/</span> <span class="number">2.0</span>);
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">map_to_screen</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">pt</span>: <span class="ident">Pt2D</span>) -&gt; <span class="ident">ScreenPt</span> {
        <span class="ident">ScreenPt::new</span>(
            (<span class="ident">pt</span>.<span class="ident">x</span>() <span class="op">*</span> <span class="self">self</span>.<span class="ident">cam_zoom</span>) <span class="op">-</span> <span class="self">self</span>.<span class="ident">cam_x</span>,
            (<span class="ident">pt</span>.<span class="ident">y</span>() <span class="op">*</span> <span class="self">self</span>.<span class="ident">cam_zoom</span>) <span class="op">-</span> <span class="self">self</span>.<span class="ident">cam_y</span>,
        )
    }

    <span class="comment">// the inner bound tells us whether auto-panning should or should not take place</span>
    <span class="kw">fn</span> <span class="ident">get_inner_bounds</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="ident">Bounds</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">b</span> <span class="op">=</span> <span class="ident">Bounds::new</span>();
        <span class="ident">b</span>.<span class="ident">update</span>(<span class="ident">ScreenPt::new</span>(<span class="ident">PANNING_THRESHOLD</span>, <span class="ident">PANNING_THRESHOLD</span>).<span class="ident">to_pt</span>());
        <span class="ident">b</span>.<span class="ident">update</span>(
            <span class="ident">ScreenPt::new</span>(
                <span class="self">self</span>.<span class="ident">window_width</span> <span class="op">-</span> <span class="ident">PANNING_THRESHOLD</span>,
                <span class="self">self</span>.<span class="ident">window_height</span> <span class="op">-</span> <span class="ident">PANNING_THRESHOLD</span>,
            )
            .<span class="ident">to_pt</span>(),
        );
        <span class="ident">b</span>
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_window_dims</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="ident">ScreenDims</span> {
        <span class="ident">ScreenDims::new</span>(<span class="self">self</span>.<span class="ident">window_width</span>, <span class="self">self</span>.<span class="ident">window_height</span>)
    }

    <span class="kw">fn</span> <span class="ident">get_map_bounds</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="ident">Bounds</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">b</span> <span class="op">=</span> <span class="ident">Bounds::new</span>();
        <span class="ident">b</span>.<span class="ident">update</span>(<span class="ident">Pt2D::new</span>(<span class="number">0.0</span>, <span class="number">0.0</span>));
        <span class="ident">b</span>.<span class="ident">update</span>(<span class="ident">Pt2D::new</span>(<span class="self">self</span>.<span class="ident">map_dims</span>.<span class="number">0</span>, <span class="self">self</span>.<span class="ident">map_dims</span>.<span class="number">1</span>));
        <span class="ident">b</span>
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_screen_bounds</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="ident">Bounds</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">b</span> <span class="op">=</span> <span class="ident">Bounds::new</span>();
        <span class="ident">b</span>.<span class="ident">update</span>(<span class="self">self</span>.<span class="ident">screen_to_map</span>(<span class="ident">ScreenPt::new</span>(<span class="number">0.0</span>, <span class="number">0.0</span>)));
        <span class="ident">b</span>.<span class="ident">update</span>(<span class="self">self</span>.<span class="ident">screen_to_map</span>(<span class="ident">ScreenPt::new</span>(<span class="self">self</span>.<span class="ident">window_width</span>, <span class="self">self</span>.<span class="ident">window_height</span>)));
        <span class="ident">b</span>
    }

    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">align_window</span>(
        <span class="kw-2">&amp;</span><span class="self">self</span>,
        <span class="ident">dims</span>: <span class="ident">ScreenDims</span>,
        <span class="ident">horiz</span>: <span class="ident">HorizontalAlignment</span>,
        <span class="ident">vert</span>: <span class="ident">VerticalAlignment</span>,
    ) -&gt; <span class="ident">ScreenPt</span> {
        <span class="kw">let</span> <span class="ident">x1</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">horiz</span> {
            <span class="ident">HorizontalAlignment::Left</span> =&gt; <span class="number">0.0</span>,
            <span class="ident">HorizontalAlignment::LeftInset</span> =&gt; <span class="ident">INSET</span>,
            <span class="ident">HorizontalAlignment::Center</span> =&gt; (<span class="self">self</span>.<span class="ident">window_width</span> <span class="op">-</span> <span class="ident">dims</span>.<span class="ident">width</span>) <span class="op">/</span> <span class="number">2.0</span>,
            <span class="ident">HorizontalAlignment::Right</span> =&gt; <span class="self">self</span>.<span class="ident">window_width</span> <span class="op">-</span> <span class="ident">dims</span>.<span class="ident">width</span>,
            <span class="ident">HorizontalAlignment::RightInset</span> =&gt; <span class="self">self</span>.<span class="ident">window_width</span> <span class="op">-</span> <span class="ident">dims</span>.<span class="ident">width</span> <span class="op">-</span> <span class="ident">INSET</span>,
            <span class="ident">HorizontalAlignment::Percent</span>(<span class="ident">pct</span>) =&gt; <span class="ident">pct</span> <span class="op">*</span> <span class="self">self</span>.<span class="ident">window_width</span>,
            <span class="ident">HorizontalAlignment::Centered</span>(<span class="ident">x</span>) =&gt; <span class="ident">x</span> <span class="op">-</span> (<span class="ident">dims</span>.<span class="ident">width</span> <span class="op">/</span> <span class="number">2.0</span>),
        };
        <span class="kw">let</span> <span class="ident">y1</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">vert</span> {
            <span class="ident">VerticalAlignment::Top</span> =&gt; <span class="number">0.0</span>,
            <span class="ident">VerticalAlignment::TopInset</span> =&gt; <span class="ident">INSET</span>,
            <span class="ident">VerticalAlignment::Center</span> =&gt; (<span class="self">self</span>.<span class="ident">window_height</span> <span class="op">-</span> <span class="ident">dims</span>.<span class="ident">height</span>) <span class="op">/</span> <span class="number">2.0</span>,
            <span class="ident">VerticalAlignment::Bottom</span> =&gt; <span class="self">self</span>.<span class="ident">window_height</span> <span class="op">-</span> <span class="ident">dims</span>.<span class="ident">height</span>,
            <span class="ident">VerticalAlignment::BottomInset</span> =&gt; <span class="self">self</span>.<span class="ident">window_height</span> <span class="op">-</span> <span class="ident">dims</span>.<span class="ident">height</span> <span class="op">-</span> <span class="ident">INSET</span>,
            <span class="comment">// TODO Hack</span>
            <span class="ident">VerticalAlignment::BottomAboveOSD</span> =&gt; <span class="self">self</span>.<span class="ident">window_height</span> <span class="op">-</span> <span class="ident">dims</span>.<span class="ident">height</span> <span class="op">-</span> <span class="number">60.0</span>,
            <span class="ident">VerticalAlignment::Percent</span>(<span class="ident">pct</span>) =&gt; <span class="ident">pct</span> <span class="op">*</span> <span class="self">self</span>.<span class="ident">window_height</span>,
            <span class="ident">VerticalAlignment::Above</span>(<span class="ident">y</span>) =&gt; <span class="ident">y</span> <span class="op">-</span> <span class="ident">dims</span>.<span class="ident">height</span>,
            <span class="ident">VerticalAlignment::Below</span>(<span class="ident">y</span>) =&gt; <span class="ident">y</span>,
        };
        <span class="ident">ScreenPt::new</span>(<span class="ident">x1</span>, <span class="ident">y1</span>)
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_unzoomed</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="ident">bool</span> {
        <span class="self">self</span>.<span class="ident">cam_zoom</span> <span class="op">&lt;</span> <span class="self">self</span>.<span class="ident">settings</span>.<span class="ident">min_zoom_for_detail</span>
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_zoomed</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="ident">bool</span> {
        <span class="self">self</span>.<span class="ident">cam_zoom</span> <span class="op">&gt;</span><span class="op">=</span> <span class="self">self</span>.<span class="ident">settings</span>.<span class="ident">min_zoom_for_detail</span>
    }

    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">is_dragging</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="ident">bool</span> {
        <span class="comment">// This could be called before or after handle_event. So we need to repeat the threshold</span>
        <span class="comment">// check here! Alternatively, we could this upfront in runner.</span>
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">drag_just_ended</span> {
            <span class="kw">return</span> <span class="bool-val">true</span>;
        }
        <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>((<span class="kw">_</span>, <span class="ident">orig</span>)) <span class="op">=</span> <span class="self">self</span>.<span class="ident">drag_canvas_from</span> {
            <span class="kw">let</span> <span class="ident">pt</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">get_cursor</span>();
            <span class="kw">let</span> <span class="ident">dist</span> <span class="op">=</span> ((<span class="ident">pt</span>.<span class="ident">x</span> <span class="op">-</span> <span class="ident">orig</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="ident">orig</span>.<span class="ident">y</span>).<span class="ident">powi</span>(<span class="number">2</span>)).<span class="ident">sqrt</span>();
            <span class="kw">if</span> <span class="ident">dist</span> <span class="op">&gt;</span> <span class="ident">DRAG_THRESHOLD</span> {
                <span class="kw">return</span> <span class="bool-val">true</span>;
            }
        }
        <span class="bool-val">false</span>
    }
}

<span class="kw">const</span> <span class="ident">INSET</span>: <span class="ident">f64</span> <span class="op">=</span> <span class="number">16.0</span>;

<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Copy</span>, <span class="ident">Debug</span>, <span class="ident">PartialEq</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">HorizontalAlignment</span> {
    <span class="ident">Left</span>,
    <span class="ident">LeftInset</span>,
    <span class="ident">Center</span>,
    <span class="ident">Right</span>,
    <span class="ident">RightInset</span>,
    <span class="ident">Percent</span>(<span class="ident">f64</span>),
    <span class="ident">Centered</span>(<span class="ident">f64</span>),
}

<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Copy</span>, <span class="ident">Debug</span>, <span class="ident">PartialEq</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">VerticalAlignment</span> {
    <span class="ident">Top</span>,
    <span class="ident">TopInset</span>,
    <span class="ident">Center</span>,
    <span class="ident">Bottom</span>,
    <span class="ident">BottomInset</span>,
    <span class="ident">BottomAboveOSD</span>,
    <span class="ident">Percent</span>(<span class="ident">f64</span>),
    <span class="ident">Above</span>(<span class="ident">f64</span>),
    <span class="ident">Below</span>(<span class="ident">f64</span>),
}
</code></pre></div>
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