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</pre><div class="example-wrap"><pre class="rust ">
<span class="kw">use</span> <span class="ident">abstutil</span>::<span class="ident">prettyprint_usize</span>;
<span class="kw">use</span> <span class="ident">map_gui</span>::<span class="ident">tools</span>::<span class="ident">ColorDiscrete</span>;
<span class="kw">use</span> <span class="ident">sim</span>::<span class="ident">Scenario</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">GfxCtx</span>, <span class="ident">HorizontalAlignment</span>, <span class="ident">Key</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">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">use</span> <span class="kw">crate</span>::<span class="ident">common</span>::<span class="ident">CommonState</span>;
<span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">devtools</span>::<span class="ident">destinations</span>::<span class="ident">PopularDestinations</span>;

<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">ScenarioManager</span> {
    <span class="ident">panel</span>: <span class="ident">Panel</span>,
    <span class="ident">scenario</span>: <span class="ident">Scenario</span>,
    <span class="ident">unzoomed</span>: <span class="ident">Drawable</span>,
    <span class="ident">zoomed</span>: <span class="ident">Drawable</span>,
}

<span class="kw">impl</span> <span class="ident">ScenarioManager</span> {
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">scenario</span>: <span class="ident">Scenario</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="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">colorer</span> <span class="op">=</span> <span class="ident">ColorDiscrete</span>::<span class="ident">new</span>(
            <span class="ident">app</span>,
            <span class="macro">vec</span><span class="macro">!</span>[
                (<span class="string">&quot;1-2&quot;</span>, <span class="ident">Color</span>::<span class="ident">BLUE</span>),
                (<span class="string">&quot;3-4&quot;</span>, <span class="ident">Color</span>::<span class="ident">RED</span>),
                (<span class="string">&quot;more&quot;</span>, <span class="ident">Color</span>::<span class="ident">BLACK</span>),
            ],
        );
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">total_cars_needed</span> <span class="op">=</span> <span class="number">0</span>;
        <span class="kw">for</span> (<span class="ident">b</span>, <span class="ident">count</span>) <span class="kw">in</span> <span class="ident">scenario</span>.<span class="ident">count_parked_cars_per_bldg</span>().<span class="ident">consume</span>() {
            <span class="ident">total_cars_needed</span> <span class="op">+</span><span class="op">=</span> <span class="ident">count</span>;
            <span class="kw">let</span> <span class="ident">color</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">count</span> <span class="op">=</span><span class="op">=</span> <span class="number">0</span> {
                <span class="kw">continue</span>;
            } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">count</span> <span class="op">=</span><span class="op">=</span> <span class="number">1</span> <span class="op">|</span><span class="op">|</span> <span class="ident">count</span> <span class="op">=</span><span class="op">=</span> <span class="number">2</span> {
                <span class="string">&quot;1-2&quot;</span>
            } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">count</span> <span class="op">=</span><span class="op">=</span> <span class="number">3</span> <span class="op">|</span><span class="op">|</span> <span class="ident">count</span> <span class="op">=</span><span class="op">=</span> <span class="number">4</span> {
                <span class="string">&quot;3-4&quot;</span>
            } <span class="kw">else</span> {
                <span class="string">&quot;more&quot;</span>
            };
            <span class="ident">colorer</span>.<span class="ident">add_b</span>(<span class="ident">b</span>, <span class="ident">color</span>);
        }

        <span class="kw">let</span> (<span class="ident">filled_spots</span>, <span class="ident">free_parking_spots</span>) <span class="op">=</span> <span class="ident">app</span>.<span class="ident">primary</span>.<span class="ident">sim</span>.<span class="ident">get_all_parking_spots</span>();
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">filled_spots</span>.<span class="ident">is_empty</span>());

        <span class="kw">let</span> (<span class="ident">unzoomed</span>, <span class="ident">zoomed</span>, <span class="ident">legend</span>) <span class="op">=</span> <span class="ident">colorer</span>.<span class="ident">build</span>(<span class="ident">ctx</span>);
        <span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">ScenarioManager</span> {
            <span class="ident">panel</span>: <span class="ident">Panel</span>::<span class="ident">new</span>(<span class="ident">Widget</span>::<span class="ident">col</span>(<span class="macro">vec</span><span class="macro">!</span>[
                <span class="ident">Widget</span>::<span class="ident">row</span>(<span class="macro">vec</span><span class="macro">!</span>[
                    <span class="ident">Line</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;Scenario {}&quot;</span>, <span class="ident">scenario</span>.<span class="ident">scenario_name</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">ctx</span>.<span class="ident">style</span>()
                    .<span class="ident">btn_outline</span>
                    .<span class="ident">text</span>(<span class="string">&quot;popular destinations&quot;</span>)
                    .<span class="ident">hotkey</span>(<span class="ident">Key</span>::<span class="ident">D</span>)
                    .<span class="ident">build_def</span>(<span class="ident">ctx</span>),
                <span class="ident">Text</span>::<span class="ident">from_multiline</span>(<span class="macro">vec</span><span class="macro">!</span>[
                    <span class="ident">Line</span>(<span class="macro">format</span><span class="macro">!</span>(
                        <span class="string">&quot;{} people&quot;</span>,
                        <span class="ident">prettyprint_usize</span>(<span class="ident">scenario</span>.<span class="ident">people</span>.<span class="ident">len</span>())
                    )),
                    <span class="ident">Line</span>(<span class="macro">format</span><span class="macro">!</span>(
                        <span class="string">&quot;seed {} parked cars&quot;</span>,
                        <span class="ident">prettyprint_usize</span>(<span class="ident">total_cars_needed</span>)
                    )),
                    <span class="ident">Line</span>(<span class="macro">format</span><span class="macro">!</span>(
                        <span class="string">&quot;{} parking spots&quot;</span>,
                        <span class="ident">prettyprint_usize</span>(<span class="ident">free_parking_spots</span>.<span class="ident">len</span>()),
                    )),
                    <span class="ident">Line</span>(<span class="string">&quot;&quot;</span>),
                    <span class="ident">Line</span>(<span class="string">&quot;Parked cars per building&quot;</span>),
                ])
                .<span class="ident">into_widget</span>(<span class="ident">ctx</span>),
                <span class="ident">legend</span>,
            ]))
            .<span class="ident">aligned</span>(<span class="ident">HorizontalAlignment</span>::<span class="ident">Right</span>, <span class="ident">VerticalAlignment</span>::<span class="ident">Top</span>)
            .<span class="ident">build</span>(<span class="ident">ctx</span>),
            <span class="ident">unzoomed</span>,
            <span class="ident">zoomed</span>,
            <span class="ident">scenario</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">ScenarioManager</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="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</span>::<span class="ident">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</span>::<span class="ident">Pop</span>;
                }
                <span class="string">&quot;popular destinations&quot;</span> <span class="op">=</span><span class="op">&gt;</span> {
                    <span class="kw">return</span> <span class="ident">Transition</span>::<span class="ident">Push</span>(<span class="ident">PopularDestinations</span>::<span class="ident">new</span>(<span class="ident">ctx</span>, <span class="ident">app</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">scenario</span>));
                }
                <span class="kw">_</span> <span class="op">=</span><span class="op">&gt;</span> <span class="macro">unreachable</span><span class="macro">!</span>(),
            },
            <span class="kw">_</span> <span class="op">=</span><span class="op">&gt;</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">recalculate_current_selection</span>(<span class="ident">ctx</span>);
        }

        <span class="ident">Transition</span>::<span class="ident">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="kw">if</span> <span class="ident">g</span>.<span class="ident">canvas</span>.<span class="ident">cam_zoom</span> <span class="op">&lt;</span> <span class="ident">app</span>.<span class="ident">opts</span>.<span class="ident">min_zoom_for_detail</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">unzoomed</span>);
        } <span class="kw">else</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">zoomed</span>);
        }
        <span class="self">self</span>.<span class="ident">panel</span>.<span class="ident">draw</span>(<span class="ident">g</span>);
        <span class="ident">CommonState</span>::<span class="ident">draw_osd</span>(<span class="ident">g</span>, <span class="ident">app</span>);
    }
}
</pre></div>
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