<!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 `widgetry/src/widgets/fan_chart.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>fan_chart.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='../../../widgetry/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">widgets</span>::<span class="ident">line_plot</span>::{<span class="ident">make_legend</span>, <span class="ident">thick_lineseries</span>, <span class="ident">Yvalue</span>};
<span class="kw">use</span> <span class="kw">crate</span>::{
    <span class="ident">Color</span>, <span class="ident">Drawable</span>, <span class="ident">EventCtx</span>, <span class="ident">GeomBatch</span>, <span class="ident">GfxCtx</span>, <span class="ident">JustDraw</span>, <span class="ident">Line</span>, <span class="ident">PlotOptions</span>, <span class="ident">ScreenDims</span>,
    <span class="ident">ScreenPt</span>, <span class="ident">Series</span>, <span class="ident">Text</span>, <span class="ident">TextExt</span>, <span class="ident">Widget</span>, <span class="ident">WidgetImpl</span>, <span class="ident">WidgetOutput</span>,
};
<span class="kw">use</span> <span class="ident">geom</span>::{
    <span class="ident">Angle</span>, <span class="ident">Distance</span>, <span class="ident">Duration</span>, <span class="ident">HgramValue</span>, <span class="ident">Histogram</span>, <span class="ident">PolyLine</span>, <span class="ident">Polygon</span>, <span class="ident">Pt2D</span>, <span class="ident">Statistic</span>, <span class="ident">Time</span>,
};
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::<span class="ident">VecDeque</span>;

<span class="comment">// The X is always time</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">FanChart</span> {
    <span class="ident">draw</span>: <span class="ident">Drawable</span>,

    <span class="ident">top_left</span>: <span class="ident">ScreenPt</span>,
    <span class="ident">dims</span>: <span class="ident">ScreenDims</span>,
}

<span class="kw">impl</span> <span class="ident">FanChart</span> {
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="ident">Yvalue</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> <span class="op">+</span> <span class="ident">HgramValue</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span><span class="op">&gt;</span>(
        <span class="ident">ctx</span>: <span class="kw-2">&amp;</span><span class="ident">EventCtx</span>,
        <span class="kw-2">mut</span> <span class="ident">series</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Series</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span><span class="op">&gt;</span>,
        <span class="ident">opts</span>: <span class="ident">PlotOptions</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>,
    ) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Widget</span> {
        <span class="kw">let</span> <span class="ident">legend</span> <span class="op">=</span> <span class="ident">make_legend</span>(<span class="ident">ctx</span>, <span class="kw-2">&amp;</span><span class="ident">series</span>, <span class="kw-2">&amp;</span><span class="ident">opts</span>);
        <span class="ident">series</span>.<span class="ident">retain</span>(<span class="op">|</span><span class="ident">s</span><span class="op">|</span> <span class="op">!</span><span class="ident">opts</span>.<span class="ident">disabled</span>.<span class="ident">contains</span>(<span class="kw-2">&amp;</span><span class="ident">s</span>.<span class="ident">label</span>));

        <span class="comment">// TODO Refactor this part with LinePlot too</span>
        <span class="comment">// Assume min_x is Time::START_OF_DAY and min_y is T::zero()</span>
        <span class="kw">let</span> <span class="ident">max_x</span> <span class="op">=</span> <span class="ident">opts</span>.<span class="ident">max_x</span>.<span class="ident">unwrap_or_else</span>(<span class="op">|</span><span class="op">|</span> {
            <span class="ident">series</span>
                .<span class="ident">iter</span>()
                .<span class="ident">map</span>(<span class="op">|</span><span class="ident">s</span><span class="op">|</span> {
                    <span class="ident">s</span>.<span class="ident">pts</span>
                        .<span class="ident">iter</span>()
                        .<span class="ident">map</span>(<span class="op">|</span>(<span class="ident">t</span>, <span class="kw">_</span>)<span class="op">|</span> <span class="kw-2">*</span><span class="ident">t</span>)
                        .<span class="ident">max</span>()
                        .<span class="ident">unwrap_or</span>(<span class="ident">Time</span>::<span class="ident">START_OF_DAY</span>)
                })
                .<span class="ident">max</span>()
                .<span class="ident">unwrap_or</span>(<span class="ident">Time</span>::<span class="ident">START_OF_DAY</span>)
        });
        <span class="kw">let</span> <span class="ident">max_y</span> <span class="op">=</span> <span class="ident">opts</span>.<span class="ident">max_y</span>.<span class="ident">unwrap_or_else</span>(<span class="op">|</span><span class="op">|</span> {
            <span class="ident">series</span>
                .<span class="ident">iter</span>()
                .<span class="ident">map</span>(<span class="op">|</span><span class="ident">s</span><span class="op">|</span> {
                    <span class="ident">s</span>.<span class="ident">pts</span>
                        .<span class="ident">iter</span>()
                        .<span class="ident">map</span>(<span class="op">|</span>(<span class="kw">_</span>, <span class="ident">value</span>)<span class="op">|</span> <span class="kw-2">*</span><span class="ident">value</span>)
                        .<span class="ident">max</span>()
                        .<span class="ident">unwrap_or</span>(<span class="ident">T</span>::<span class="ident">zero</span>())
                })
                .<span class="ident">max</span>()
                .<span class="ident">unwrap_or</span>(<span class="ident">T</span>::<span class="ident">zero</span>())
        });

        <span class="comment">// TODO Tuned to fit the info panel. Instead these should somehow stretch to fill their</span>
        <span class="comment">// container.</span>
        <span class="kw">let</span> <span class="ident">width</span> <span class="op">=</span> <span class="number">0.22</span> <span class="op">*</span> <span class="ident">ctx</span>.<span class="ident">canvas</span>.<span class="ident">window_width</span>;
        <span class="kw">let</span> <span class="ident">height</span> <span class="op">=</span> <span class="number">0.2</span> <span class="op">*</span> <span class="ident">ctx</span>.<span class="ident">canvas</span>.<span class="ident">window_height</span>;

        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">batch</span> <span class="op">=</span> <span class="ident">GeomBatch</span>::<span class="ident">new</span>();
        <span class="comment">// Grid lines for the Y scale. Draw up to 10 lines max to cover the order of magnitude of</span>
        <span class="comment">// the range.</span>
        <span class="comment">// TODO This caps correctly, but if the max is 105, then suddenly we just have 2 grid</span>
        <span class="comment">// lines.</span>
        {
            <span class="kw">let</span> <span class="ident">order_of_mag</span> <span class="op">=</span> <span class="number">10.0_f64</span>.<span class="ident">powf</span>(<span class="ident">max_y</span>.<span class="ident">to_f64</span>().<span class="ident">log10</span>().<span class="ident">ceil</span>());
            <span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">10</span> {
                <span class="kw">let</span> <span class="ident">y</span> <span class="op">=</span> <span class="ident">max_y</span>.<span class="ident">from_f64</span>(<span class="ident">order_of_mag</span> <span class="op">/</span> <span class="number">10.0</span> <span class="op">*</span> (<span class="ident">i</span> <span class="kw">as</span> <span class="ident">f64</span>));
                <span class="kw">let</span> <span class="ident">pct</span> <span class="op">=</span> <span class="ident">y</span>.<span class="ident">to_percent</span>(<span class="ident">max_y</span>);
                <span class="kw">if</span> <span class="ident">pct</span> <span class="op">&gt;</span> <span class="number">1.0</span> {
                    <span class="kw">break</span>;
                }
                <span class="ident">batch</span>.<span class="ident">push</span>(
                    <span class="ident">Color</span>::<span class="ident">hex</span>(<span class="string">&quot;#7C7C7C&quot;</span>),
                    <span class="ident">PolyLine</span>::<span class="ident">must_new</span>(<span class="macro">vec</span><span class="macro">!</span>[
                        <span class="ident">Pt2D</span>::<span class="ident">new</span>(<span class="number">0.0</span>, (<span class="number">1.0</span> <span class="op">-</span> <span class="ident">pct</span>) <span class="op">*</span> <span class="ident">height</span>),
                        <span class="ident">Pt2D</span>::<span class="ident">new</span>(<span class="ident">width</span>, (<span class="number">1.0</span> <span class="op">-</span> <span class="ident">pct</span>) <span class="op">*</span> <span class="ident">height</span>),
                    ])
                    .<span class="ident">make_polygons</span>(<span class="ident">Distance</span>::<span class="ident">meters</span>(<span class="number">1.0</span>)),
                );
            }
        }
        <span class="comment">// X axis grid</span>
        <span class="kw">if</span> <span class="ident">max_x</span> <span class="op">!</span><span class="op">=</span> <span class="ident">Time</span>::<span class="ident">START_OF_DAY</span> {
            <span class="kw">let</span> <span class="ident">order_of_mag</span> <span class="op">=</span> <span class="number">10.0_f64</span>.<span class="ident">powf</span>(<span class="ident">max_x</span>.<span class="ident">inner_seconds</span>().<span class="ident">log10</span>().<span class="ident">ceil</span>());
            <span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">10</span> {
                <span class="kw">let</span> <span class="ident">x</span> <span class="op">=</span> <span class="ident">Time</span>::<span class="ident">START_OF_DAY</span> <span class="op">+</span> <span class="ident">Duration</span>::<span class="ident">seconds</span>(<span class="ident">order_of_mag</span> <span class="op">/</span> <span class="number">10.0</span> <span class="op">*</span> (<span class="ident">i</span> <span class="kw">as</span> <span class="ident">f64</span>));
                <span class="kw">let</span> <span class="ident">pct</span> <span class="op">=</span> <span class="ident">x</span>.<span class="ident">to_percent</span>(<span class="ident">max_x</span>);
                <span class="kw">if</span> <span class="ident">pct</span> <span class="op">&gt;</span> <span class="number">1.0</span> {
                    <span class="kw">break</span>;
                }
                <span class="ident">batch</span>.<span class="ident">push</span>(
                    <span class="ident">Color</span>::<span class="ident">hex</span>(<span class="string">&quot;#7C7C7C&quot;</span>),
                    <span class="ident">PolyLine</span>::<span class="ident">must_new</span>(<span class="macro">vec</span><span class="macro">!</span>[
                        <span class="ident">Pt2D</span>::<span class="ident">new</span>(<span class="ident">pct</span> <span class="op">*</span> <span class="ident">width</span>, <span class="number">0.0</span>),
                        <span class="ident">Pt2D</span>::<span class="ident">new</span>(<span class="ident">pct</span> <span class="op">*</span> <span class="ident">width</span>, <span class="ident">height</span>),
                    ])
                    .<span class="ident">make_polygons</span>(<span class="ident">Distance</span>::<span class="ident">meters</span>(<span class="number">1.0</span>)),
                );
            }
        }

        <span class="kw">let</span> <span class="ident">transform</span> <span class="op">=</span> <span class="op">|</span><span class="ident">input</span>: <span class="ident">Vec</span><span class="op">&lt;</span>(<span class="ident">Time</span>, <span class="ident">T</span>)<span class="op">&gt;</span><span class="op">|</span> {
            <span class="comment">// TODO Copied from LinePlot...</span>
            <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">pts</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
            <span class="kw">for</span> (<span class="ident">t</span>, <span class="ident">y</span>) <span class="kw">in</span> <span class="ident">input</span> {
                <span class="kw">let</span> <span class="ident">percent_x</span> <span class="op">=</span> <span class="ident">t</span>.<span class="ident">to_percent</span>(<span class="ident">max_x</span>);
                <span class="kw">let</span> <span class="ident">percent_y</span> <span class="op">=</span> <span class="ident">y</span>.<span class="ident">to_percent</span>(<span class="ident">max_y</span>);
                <span class="ident">pts</span>.<span class="ident">push</span>(<span class="ident">Pt2D</span>::<span class="ident">new</span>(
                    <span class="ident">percent_x</span> <span class="op">*</span> <span class="ident">width</span>,
                    <span class="comment">// Y inversion! :D</span>
                    (<span class="number">1.0</span> <span class="op">-</span> <span class="ident">percent_y</span>) <span class="op">*</span> <span class="ident">height</span>,
                ));
            }
            <span class="ident">pts</span>.<span class="ident">dedup</span>();
            <span class="ident">pts</span>
        };

        <span class="kw">for</span> <span class="ident">s</span> <span class="kw">in</span> <span class="ident">series</span> {
            <span class="kw">if</span> <span class="ident">s</span>.<span class="ident">pts</span>.<span class="ident">len</span>() <span class="op">&lt;</span> <span class="number">2</span> {
                <span class="kw">continue</span>;
            }
            <span class="kw">let</span> (<span class="ident">p50</span>, <span class="ident">p90</span>, <span class="kw-2">mut</span> <span class="ident">p99</span>) <span class="op">=</span> <span class="ident">slidey_window</span>(<span class="ident">s</span>.<span class="ident">pts</span>, <span class="ident">Duration</span>::<span class="ident">hours</span>(<span class="number">1</span>));

            <span class="comment">// Make a band between p50 and p99</span>
            <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">band</span> <span class="op">=</span> <span class="ident">transform</span>(<span class="ident">p50</span>);
            <span class="ident">p99</span>.<span class="ident">reverse</span>();
            <span class="ident">band</span>.<span class="ident">extend</span>(<span class="ident">transform</span>(<span class="ident">p99</span>));
            <span class="ident">band</span>.<span class="ident">push</span>(<span class="ident">band</span>[<span class="number">0</span>]);
            <span class="ident">batch</span>.<span class="ident">push</span>(<span class="ident">s</span>.<span class="ident">color</span>.<span class="ident">alpha</span>(<span class="number">0.5</span>), <span class="ident">Polygon</span>::<span class="ident">buggy_new</span>(<span class="ident">band</span>));

            <span class="ident">batch</span>.<span class="ident">push</span>(
                <span class="ident">s</span>.<span class="ident">color</span>,
                <span class="ident">thick_lineseries</span>(<span class="ident">transform</span>(<span class="ident">p90</span>), <span class="ident">Distance</span>::<span class="ident">meters</span>(<span class="number">5.0</span>)),
            );
        }

        <span class="kw">let</span> <span class="ident">plot</span> <span class="op">=</span> <span class="ident">FanChart</span> {
            <span class="ident">draw</span>: <span class="ident">ctx</span>.<span class="ident">upload</span>(<span class="ident">batch</span>),

            <span class="ident">top_left</span>: <span class="ident">ScreenPt</span>::<span class="ident">new</span>(<span class="number">0.0</span>, <span class="number">0.0</span>),
            <span class="ident">dims</span>: <span class="ident">ScreenDims</span>::<span class="ident">new</span>(<span class="ident">width</span>, <span class="ident">height</span>),
        };

        <span class="kw">let</span> <span class="ident">num_x_labels</span> <span class="op">=</span> <span class="number">3</span>;
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">row</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">num_x_labels</span> {
            <span class="kw">let</span> <span class="ident">percent_x</span> <span class="op">=</span> (<span class="ident">i</span> <span class="kw">as</span> <span class="ident">f64</span>) <span class="op">/</span> ((<span class="ident">num_x_labels</span> <span class="op">-</span> <span class="number">1</span>) <span class="kw">as</span> <span class="ident">f64</span>);
            <span class="kw">let</span> <span class="ident">t</span> <span class="op">=</span> <span class="ident">max_x</span>.<span class="ident">percent_of</span>(<span class="ident">percent_x</span>);
            <span class="comment">// TODO Need ticks now to actually see where this goes</span>
            <span class="kw">let</span> <span class="ident">batch</span> <span class="op">=</span> <span class="ident">Text</span>::<span class="ident">from</span>(<span class="ident">Line</span>(<span class="ident">t</span>.<span class="ident">to_string</span>()))
                .<span class="ident">render</span>(<span class="ident">ctx</span>)
                .<span class="ident">rotate</span>(<span class="ident">Angle</span>::<span class="ident">new_degs</span>(<span class="op">-</span><span class="number">15.0</span>))
                .<span class="ident">autocrop</span>();
            <span class="comment">// The text is already scaled; don&#39;t use Widget::draw_batch and scale it again.</span>
            <span class="ident">row</span>.<span class="ident">push</span>(<span class="ident">JustDraw</span>::<span class="ident">wrap</span>(<span class="ident">ctx</span>, <span class="ident">batch</span>));
        }
        <span class="kw">let</span> <span class="ident">x_axis</span> <span class="op">=</span> <span class="ident">Widget</span>::<span class="ident">custom_row</span>(<span class="ident">row</span>).<span class="ident">padding</span>(<span class="number">10</span>).<span class="ident">evenly_spaced</span>();

        <span class="kw">let</span> <span class="ident">num_y_labels</span> <span class="op">=</span> <span class="number">4</span>;
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">col</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">num_y_labels</span> {
            <span class="kw">let</span> <span class="ident">percent_y</span> <span class="op">=</span> (<span class="ident">i</span> <span class="kw">as</span> <span class="ident">f64</span>) <span class="op">/</span> ((<span class="ident">num_y_labels</span> <span class="op">-</span> <span class="number">1</span>) <span class="kw">as</span> <span class="ident">f64</span>);
            <span class="ident">col</span>.<span class="ident">push</span>(<span class="ident">max_y</span>.<span class="ident">from_percent</span>(<span class="ident">percent_y</span>).<span class="ident">prettyprint</span>().<span class="ident">draw_text</span>(<span class="ident">ctx</span>));
        }
        <span class="ident">col</span>.<span class="ident">reverse</span>();
        <span class="kw">let</span> <span class="ident">y_axis</span> <span class="op">=</span> <span class="ident">Widget</span>::<span class="ident">custom_col</span>(<span class="ident">col</span>).<span class="ident">padding</span>(<span class="number">10</span>).<span class="ident">evenly_spaced</span>();

        <span class="comment">// Don&#39;t let the x-axis fill the parent container</span>
        <span class="ident">Widget</span>::<span class="ident">custom_col</span>(<span class="macro">vec</span><span class="macro">!</span>[
            <span class="ident">legend</span>.<span class="ident">margin_below</span>(<span class="number">10</span>),
            <span class="ident">Widget</span>::<span class="ident">custom_row</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="ident">y_axis</span>, <span class="ident">Widget</span>::<span class="ident">new</span>(<span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">plot</span>))]),
            <span class="ident">x_axis</span>,
        ])
        .<span class="ident">container</span>()
    }
}

<span class="kw">impl</span> <span class="ident">WidgetImpl</span> <span class="kw">for</span> <span class="ident">FanChart</span> {
    <span class="kw">fn</span> <span class="ident">get_dims</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">ScreenDims</span> {
        <span class="self">self</span>.<span class="ident">dims</span>
    }

    <span class="kw">fn</span> <span class="ident">set_pos</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">top_left</span>: <span class="ident">ScreenPt</span>) {
        <span class="self">self</span>.<span class="ident">top_left</span> <span class="op">=</span> <span class="ident">top_left</span>;
    }

    <span class="kw">fn</span> <span class="ident">event</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="kw">_</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">EventCtx</span>, <span class="kw">_</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">WidgetOutput</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">g</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">GfxCtx</span>) {
        <span class="ident">g</span>.<span class="ident">redraw_at</span>(<span class="self">self</span>.<span class="ident">top_left</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">draw</span>);
    }
}

<span class="comment">// Returns (P50, P90, P99)</span>
<span class="kw">fn</span> <span class="ident">slidey_window</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="ident">HgramValue</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span><span class="op">&gt;</span>(
    <span class="ident">input</span>: <span class="ident">Vec</span><span class="op">&lt;</span>(<span class="ident">Time</span>, <span class="ident">T</span>)<span class="op">&gt;</span>,
    <span class="ident">window_size</span>: <span class="ident">Duration</span>,
) <span class="op">-</span><span class="op">&gt;</span> (<span class="ident">Vec</span><span class="op">&lt;</span>(<span class="ident">Time</span>, <span class="ident">T</span>)<span class="op">&gt;</span>, <span class="ident">Vec</span><span class="op">&lt;</span>(<span class="ident">Time</span>, <span class="ident">T</span>)<span class="op">&gt;</span>, <span class="ident">Vec</span><span class="op">&lt;</span>(<span class="ident">Time</span>, <span class="ident">T</span>)<span class="op">&gt;</span>) {
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">p50</span>: <span class="ident">Vec</span><span class="op">&lt;</span>(<span class="ident">Time</span>, <span class="ident">T</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">p90</span>: <span class="ident">Vec</span><span class="op">&lt;</span>(<span class="ident">Time</span>, <span class="ident">T</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">p99</span>: <span class="ident">Vec</span><span class="op">&lt;</span>(<span class="ident">Time</span>, <span class="ident">T</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">window</span>: <span class="ident">VecDeque</span><span class="op">&lt;</span>(<span class="ident">Time</span>, <span class="ident">T</span>)<span class="op">&gt;</span> <span class="op">=</span> <span class="ident">VecDeque</span>::<span class="ident">new</span>();
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">hgram</span> <span class="op">=</span> <span class="ident">Histogram</span>::<span class="ident">new</span>();

    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">last_sample</span> <span class="op">=</span> <span class="ident">Time</span>::<span class="ident">START_OF_DAY</span>;

    <span class="kw">for</span> (<span class="ident">t</span>, <span class="ident">value</span>) <span class="kw">in</span> <span class="ident">input</span> {
        <span class="ident">window</span>.<span class="ident">push_back</span>((<span class="ident">t</span>, <span class="ident">value</span>));
        <span class="ident">hgram</span>.<span class="ident">add</span>(<span class="ident">value</span>);

        <span class="kw">if</span> <span class="ident">t</span> <span class="op">-</span> <span class="ident">last_sample</span> <span class="op">&gt;</span> <span class="ident">Duration</span>::<span class="ident">minutes</span>(<span class="number">1</span>) {
            <span class="ident">p50</span>.<span class="ident">push</span>((<span class="ident">t</span>, <span class="ident">hgram</span>.<span class="ident">select</span>(<span class="ident">Statistic</span>::<span class="ident">P50</span>).<span class="ident">unwrap</span>()));
            <span class="ident">p90</span>.<span class="ident">push</span>((<span class="ident">t</span>, <span class="ident">hgram</span>.<span class="ident">select</span>(<span class="ident">Statistic</span>::<span class="ident">P90</span>).<span class="ident">unwrap</span>()));
            <span class="ident">p99</span>.<span class="ident">push</span>((<span class="ident">t</span>, <span class="ident">hgram</span>.<span class="ident">select</span>(<span class="ident">Statistic</span>::<span class="ident">P99</span>).<span class="ident">unwrap</span>()));
            <span class="ident">last_sample</span> <span class="op">=</span> <span class="ident">t</span>;
        }

        <span class="kw">while</span> <span class="op">!</span><span class="ident">window</span>.<span class="ident">is_empty</span>() <span class="kw-2">&amp;</span><span class="op">&amp;</span> <span class="ident">t</span> <span class="op">-</span> <span class="ident">window</span>.<span class="ident">front</span>().<span class="ident">unwrap</span>().<span class="number">0</span> <span class="op">&gt;</span> <span class="ident">window_size</span> {
            <span class="kw">let</span> (<span class="kw">_</span>, <span class="ident">old_value</span>) <span class="op">=</span> <span class="ident">window</span>.<span class="ident">pop_front</span>().<span class="ident">unwrap</span>();
            <span class="ident">hgram</span>.<span class="ident">remove</span>(<span class="ident">old_value</span>);
        }
    }

    (<span class="ident">p50</span>, <span class="ident">p90</span>, <span class="ident">p99</span>)
}
</pre></div>
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