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</pre><div class="example-wrap"><pre class="rust ">
<span class="kw">use</span> <span class="ident">abstutil::Counter</span>;
<span class="kw">use</span> <span class="ident">map_gui::tools</span>::{<span class="ident">make_heatmap</span>, <span class="ident">HeatmapOptions</span>};
<span class="kw">use</span> <span class="ident">map_gui::ID</span>;
<span class="kw">use</span> <span class="ident">map_model</span>::{<span class="ident">AmenityType</span>, <span class="ident">BuildingID</span>};
<span class="kw">use</span> <span class="ident">sim</span>::{<span class="ident">Scenario</span>, <span class="ident">TripEndpoint</span>};
<span class="kw">use</span> <span class="ident">widgetry</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">HorizontalAlignment</span>, <span class="ident">Line</span>, <span class="ident">Outcome</span>, <span class="ident">Panel</span>, <span class="ident">State</span>,
    <span class="ident">Text</span>, <span class="ident">Toggle</span>, <span class="ident">VerticalAlignment</span>, <span class="ident">Widget</span>,
};

<span class="kw">use</span> <span class="kw">crate</span><span class="ident">::app</span>::{<span class="ident">App</span>, <span class="ident">Transition</span>};

<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">PopularDestinations</span> {
    <span class="ident">per_bldg</span>: <span class="ident">Counter</span><span class="op">&lt;</span><span class="ident">BuildingID</span><span class="op">&gt;</span>,
    <span class="ident">panel</span>: <span class="ident">Panel</span>,
    <span class="ident">draw</span>: <span class="ident">Drawable</span>,
}

<span class="kw">impl</span> <span class="ident">PopularDestinations</span> {
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new_state</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="ident">app</span>: <span class="kw-2">&amp;</span><span class="ident">App</span>, <span class="ident">scenario</span>: <span class="kw-2">&amp;</span><span class="ident">Scenario</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">State</span><span class="op">&lt;</span><span class="ident">App</span><span class="op">&gt;</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">per_bldg</span> <span class="op">=</span> <span class="ident">Counter::new</span>();
        <span class="kw">for</span> <span class="ident">p</span> <span class="kw">in</span> <span class="kw-2">&amp;</span><span class="ident">scenario</span>.<span class="ident">people</span> {
            <span class="kw">for</span> <span class="ident">trip</span> <span class="kw">in</span> <span class="kw-2">&amp;</span><span class="ident">p</span>.<span class="ident">trips</span> {
                <span class="kw">if</span> <span class="kw">let</span> <span class="ident">TripEndpoint::Bldg</span>(<span class="ident">b</span>) <span class="op">=</span> <span class="ident">trip</span>.<span class="ident">destination</span> {
                    <span class="ident">per_bldg</span>.<span class="ident">inc</span>(<span class="ident">b</span>);
                }
            }
        }
        <span class="ident">PopularDestinations::make</span>(<span class="ident">ctx</span>, <span class="ident">app</span>, <span class="ident">per_bldg</span>, <span class="prelude-val">None</span>)
    }

    <span class="kw">fn</span> <span class="ident">make</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="ident">app</span>: <span class="kw-2">&amp;</span><span class="ident">App</span>,
        <span class="ident">per_bldg</span>: <span class="ident">Counter</span><span class="op">&lt;</span><span class="ident">BuildingID</span><span class="op">&gt;</span>,
        <span class="ident">opts</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">HeatmapOptions</span><span class="op">&gt;</span>,
    ) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">State</span><span class="op">&lt;</span><span class="ident">App</span><span class="op">&gt;</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="ident">map</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="ident">app</span>.<span class="ident">primary</span>.<span class="ident">map</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::new</span>();
        <span class="kw">let</span> <span class="ident">controls</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">o</span>) <span class="op">=</span> <span class="ident">opts</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::new</span>();
            <span class="kw">for</span> (<span class="ident">b</span>, <span class="ident">cnt</span>) <span class="kw">in</span> <span class="ident">per_bldg</span>.<span class="ident">borrow</span>() {
                <span class="kw">let</span> <span class="ident">pt</span> <span class="op">=</span> <span class="ident">map</span>.<span class="ident">get_b</span>(<span class="kw-2">*</span><span class="ident">b</span>).<span class="ident">label_center</span>;
                <span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="kw-2">*</span><span class="ident">cnt</span> {
                    <span class="ident">pts</span>.<span class="ident">push</span>(<span class="ident">pt</span>);
                }
            }
            <span class="comment">// TODO Er, the heatmap actually looks terrible.</span>
            <span class="kw">let</span> <span class="ident">legend</span> <span class="op">=</span> <span class="ident">make_heatmap</span>(<span class="ident">ctx</span>, <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">batch</span>, <span class="ident">map</span>.<span class="ident">get_bounds</span>(), <span class="ident">pts</span>, <span class="ident">o</span>);
            <span class="ident">Widget::col</span>(<span class="ident">o</span>.<span class="ident">to_controls</span>(<span class="ident">ctx</span>, <span class="ident">legend</span>))
        } <span class="kw">else</span> {
            <span class="kw">let</span> <span class="ident">max</span> <span class="op">=</span> <span class="ident">per_bldg</span>.<span class="ident">max</span>();
            <span class="kw">let</span> <span class="ident">gradient</span> <span class="op">=</span> <span class="ident">colorous::REDS</span>;
            <span class="kw">for</span> (<span class="ident">b</span>, <span class="ident">cnt</span>) <span class="kw">in</span> <span class="ident">per_bldg</span>.<span class="ident">borrow</span>() {
                <span class="kw">let</span> <span class="ident">c</span> <span class="op">=</span> <span class="ident">gradient</span>.<span class="ident">eval_rational</span>(<span class="kw-2">*</span><span class="ident">cnt</span>, <span class="ident">max</span>);
                <span class="ident">batch</span>.<span class="ident">push</span>(
                    <span class="ident">Color::rgb</span>(<span class="ident">c</span>.<span class="ident">r</span> <span class="kw">as</span> <span class="ident">usize</span>, <span class="ident">c</span>.<span class="ident">g</span> <span class="kw">as</span> <span class="ident">usize</span>, <span class="ident">c</span>.<span class="ident">b</span> <span class="kw">as</span> <span class="ident">usize</span>),
                    <span class="ident">map</span>.<span class="ident">get_b</span>(<span class="kw-2">*</span><span class="ident">b</span>).<span class="ident">polygon</span>.<span class="ident">clone</span>(),
                );
            }
            <span class="ident">Widget::nothing</span>()
        };

        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">by_type</span> <span class="op">=</span> <span class="ident">Counter::new</span>();
        <span class="kw">for</span> (<span class="ident">b</span>, <span class="ident">cnt</span>) <span class="kw">in</span> <span class="ident">per_bldg</span>.<span class="ident">borrow</span>() {
            <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">other</span> <span class="op">=</span> <span class="bool-val">true</span>;
            <span class="kw">for</span> <span class="ident">a</span> <span class="kw">in</span> <span class="kw-2">&amp;</span><span class="ident">map</span>.<span class="ident">get_b</span>(<span class="kw-2">*</span><span class="ident">b</span>).<span class="ident">amenities</span> {
                <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">t</span>) <span class="op">=</span> <span class="ident">AmenityType::categorize</span>(<span class="kw-2">&amp;</span><span class="ident">a</span>.<span class="ident">amenity_type</span>) {
                    <span class="ident">by_type</span>.<span class="ident">add</span>(<span class="prelude-val">Some</span>(<span class="ident">t</span>), <span class="kw-2">*</span><span class="ident">cnt</span>);
                    <span class="ident">other</span> <span class="op">=</span> <span class="bool-val">false</span>;
                }
            }
            <span class="kw">if</span> <span class="ident">other</span> {
                <span class="ident">by_type</span>.<span class="ident">add</span>(<span class="prelude-val">None</span>, <span class="kw-2">*</span><span class="ident">cnt</span>);
            }
        }
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">breakdown</span> <span class="op">=</span> <span class="ident">Text::from</span>(<span class="string">&quot;Breakdown by type&quot;</span>);
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">list</span> <span class="op">=</span> <span class="ident">by_type</span>.<span class="ident">consume</span>().<span class="ident">into_iter</span>().<span class="ident">collect</span>::<span class="op">&lt;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="kw">_</span><span class="op">&gt;</span><span class="op">&gt;</span>();
        <span class="ident">list</span>.<span class="ident">sort_by_key</span>(<span class="op">|</span>(<span class="kw">_</span>, <span class="ident">cnt</span>)<span class="op">|</span> <span class="kw-2">*</span><span class="ident">cnt</span>);
        <span class="ident">list</span>.<span class="ident">reverse</span>();
        <span class="kw">let</span> <span class="ident">sum</span> <span class="op">=</span> <span class="ident">per_bldg</span>.<span class="ident">sum</span>() <span class="kw">as</span> <span class="ident">f64</span>;
        <span class="kw">for</span> (<span class="ident">category</span>, <span class="ident">cnt</span>) <span class="kw">in</span> <span class="ident">list</span> {
            <span class="ident">breakdown</span>.<span class="ident">add_line</span>(<span class="macro">format!</span>(
                <span class="string">&quot;{}: {}%&quot;</span>,
                <span class="ident">category</span>
                    .<span class="ident">map</span>(<span class="op">|</span><span class="ident">x</span><span class="op">|</span> <span class="ident">x</span>.<span class="ident">to_string</span>())
                    .<span class="ident">unwrap_or_else</span>(<span class="op">|</span><span class="op">|</span> <span class="string">&quot;other&quot;</span>.<span class="ident">to_string</span>()),
                ((<span class="ident">cnt</span> <span class="kw">as</span> <span class="ident">f64</span>) <span class="op">/</span> <span class="ident">sum</span> <span class="op">*</span> <span class="number">100.0</span>) <span class="kw">as</span> <span class="ident">usize</span>
            ));
        }

        <span class="ident">Box::new</span>(<span class="ident">PopularDestinations</span> {
            <span class="ident">per_bldg</span>,
            <span class="ident">draw</span>: <span class="ident">ctx</span>.<span class="ident">upload</span>(<span class="ident">batch</span>),
            <span class="ident">panel</span>: <span class="ident">Panel::new_builder</span>(<span class="ident">Widget::col</span>(<span class="macro">vec!</span>[
                <span class="ident">Widget::row</span>(<span class="macro">vec!</span>[
                    <span class="ident">Line</span>(<span class="string">&quot;Most popular destinations&quot;</span>)
                        .<span class="ident">small_heading</span>()
                        .<span class="ident">into_widget</span>(<span class="ident">ctx</span>),
                    <span class="ident">ctx</span>.<span class="ident">style</span>().<span class="ident">btn_close_widget</span>(<span class="ident">ctx</span>),
                ]),
                <span class="ident">Toggle::switch</span>(<span class="ident">ctx</span>, <span class="string">&quot;Show heatmap&quot;</span>, <span class="prelude-val">None</span>, <span class="ident">opts</span>.<span class="ident">is_some</span>()),
                <span class="ident">controls</span>,
                <span class="ident">breakdown</span>.<span class="ident">into_widget</span>(<span class="ident">ctx</span>),
            ]))
            .<span class="ident">aligned</span>(<span class="ident">HorizontalAlignment::Right</span>, <span class="ident">VerticalAlignment::Top</span>)
            .<span class="ident">build</span>(<span class="ident">ctx</span>),
        })
    }
}

<span class="kw">impl</span> <span class="ident">State</span><span class="op">&lt;</span><span class="ident">App</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">PopularDestinations</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="ident">ctx</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">EventCtx</span>, <span class="ident">app</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">App</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Transition</span> {
        <span class="ident">ctx</span>.<span class="ident">canvas_movement</span>();
        <span class="kw">if</span> <span class="ident">ctx</span>.<span class="ident">redo_mouseover</span>() {
            <span class="ident">app</span>.<span class="ident">primary</span>.<span class="ident">current_selection</span> <span class="op">=</span> <span class="ident">app</span>.<span class="ident">mouseover_unzoomed_buildings</span>(<span class="ident">ctx</span>);
            <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">ID::Building</span>(<span class="kw">_</span>)) <span class="op">=</span> <span class="ident">app</span>.<span class="ident">primary</span>.<span class="ident">current_selection</span> {
            } <span class="kw">else</span> {
                <span class="ident">app</span>.<span class="ident">primary</span>.<span class="ident">current_selection</span> <span class="op">=</span> <span class="prelude-val">None</span>;
            }
        }

        <span class="kw">match</span> <span class="self">self</span>.<span class="ident">panel</span>.<span class="ident">event</span>(<span class="ident">ctx</span>) {
            <span class="ident">Outcome::Clicked</span>(<span class="ident">x</span>) <span class="op">=</span><span class="op">&gt;</span> <span class="kw">match</span> <span class="ident">x</span>.<span class="ident">as_ref</span>() {
                <span class="string">&quot;close&quot;</span> <span class="op">=</span><span class="op">&gt;</span> {
                    <span class="kw">return</span> <span class="ident">Transition::Pop</span>;
                }
                <span class="kw">_</span> <span class="op">=</span><span class="op">&gt;</span> <span class="macro">unreachable!</span>(),
            },
            <span class="ident">Outcome::Changed</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">&gt;</span> {
                <span class="kw">return</span> <span class="ident">Transition::Replace</span>(<span class="ident">PopularDestinations::make</span>(
                    <span class="ident">ctx</span>,
                    <span class="ident">app</span>,
                    <span class="self">self</span>.<span class="ident">per_bldg</span>.<span class="ident">clone</span>(),
                    <span class="kw">if</span> <span class="self">self</span>.<span class="ident">panel</span>.<span class="ident">is_checked</span>(<span class="string">&quot;Show heatmap&quot;</span>) {
                        <span class="prelude-val">Some</span>(<span class="ident">HeatmapOptions::from_controls</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">panel</span>))
                    } <span class="kw">else</span> {
                        <span class="prelude-val">None</span>
                    },
                ));
            }
            <span class="kw">_</span> <span class="op">=</span><span class="op">&gt;</span> {}
        }

        <span class="ident">Transition::Keep</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">app</span>: <span class="kw-2">&amp;</span><span class="ident">App</span>) {
        <span class="ident">g</span>.<span class="ident">redraw</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">draw</span>);
        <span class="self">self</span>.<span class="ident">panel</span>.<span class="ident">draw</span>(<span class="ident">g</span>);

        <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">ID::Building</span>(<span class="ident">b</span>)) <span class="op">=</span> <span class="ident">app</span>.<span class="ident">primary</span>.<span class="ident">current_selection</span> {
            <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">txt</span> <span class="op">=</span> <span class="ident">Text::new</span>();
            <span class="ident">txt</span>.<span class="ident">add_line</span>(<span class="macro">format!</span>(
                <span class="string">&quot;{} trips to here&quot;</span>,
                <span class="ident">abstutil::prettyprint_usize</span>(<span class="self">self</span>.<span class="ident">per_bldg</span>.<span class="ident">get</span>(<span class="ident">b</span>))
            ));
            <span class="kw">for</span> <span class="ident">a</span> <span class="kw">in</span> <span class="kw-2">&amp;</span><span class="ident">app</span>.<span class="ident">primary</span>.<span class="ident">map</span>.<span class="ident">get_b</span>(<span class="ident">b</span>).<span class="ident">amenities</span> {
                <span class="ident">txt</span>.<span class="ident">add_line</span>(<span class="macro">format!</span>(
                    <span class="string">&quot;  {} ({})&quot;</span>,
                    <span class="ident">a</span>.<span class="ident">names</span>.<span class="ident">get</span>(<span class="ident">app</span>.<span class="ident">opts</span>.<span class="ident">language</span>.<span class="ident">as_ref</span>()),
                    <span class="ident">a</span>.<span class="ident">amenity_type</span>
                ));
            }
            <span class="ident">g</span>.<span class="ident">draw_mouse_tooltip</span>(<span class="ident">txt</span>);
        }
    }
}
</pre></div>
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