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</pre><div class="example-wrap"><pre class="rust ">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::<span class="ident">HashMap</span>;

<span class="kw">use</span> <span class="ident">abstutil</span>::{<span class="ident">prettyprint_usize</span>, <span class="ident">Counter</span>, <span class="ident">Parallelism</span>, <span class="ident">Timer</span>};
<span class="kw">use</span> <span class="ident">geom</span>::{<span class="ident">ArrowCap</span>, <span class="ident">Distance</span>, <span class="ident">Duration</span>, <span class="ident">Polygon</span>, <span class="ident">Time</span>};
<span class="kw">use</span> <span class="ident">map_gui</span>::<span class="ident">render</span>::<span class="ident">DrawOptions</span>;
<span class="kw">use</span> <span class="ident">map_gui</span>::<span class="ident">ID</span>;
<span class="kw">use</span> <span class="ident">map_model</span>::{<span class="ident">ControlTrafficSignal</span>, <span class="ident">IntersectionID</span>, <span class="ident">MovementID</span>, <span class="ident">PathStep</span>, <span class="ident">TurnType</span>};
<span class="kw">use</span> <span class="ident">sim</span>::<span class="ident">TripEndpoint</span>;
<span class="kw">use</span> <span class="ident">widgetry</span>::{
    <span class="ident">Color</span>, <span class="ident">DrawBaselayer</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">Key</span>, <span class="ident">Line</span>,
    <span class="ident">Outcome</span>, <span class="ident">Panel</span>, <span class="ident">Spinner</span>, <span class="ident">State</span>, <span class="ident">Text</span>, <span class="ident">TextExt</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">ShowEverything</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">pub</span> <span class="kw">struct</span> <span class="ident">TrafficSignalDemand</span> {
    <span class="ident">panel</span>: <span class="ident">Panel</span>,
    <span class="ident">all_demand</span>: <span class="ident">HashMap</span><span class="op">&lt;</span><span class="ident">IntersectionID</span>, <span class="ident">Demand</span><span class="op">&gt;</span>,
    <span class="ident">hour</span>: <span class="ident">Time</span>,
    <span class="ident">draw_all</span>: <span class="ident">Drawable</span>,
    <span class="ident">selected</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span>(<span class="ident">Drawable</span>, <span class="ident">Text</span>)<span class="op">&gt;</span>,
}

<span class="kw">impl</span> <span class="ident">TrafficSignalDemand</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="kw-2">mut</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="ident">all_demand</span> <span class="op">=</span> <span class="ident">ctx</span>.<span class="ident">loading_screen</span>(<span class="string">&quot;predict all demand&quot;</span>, <span class="op">|</span><span class="kw">_</span>, <span class="ident">timer</span><span class="op">|</span> {
            <span class="ident">Demand</span>::<span class="ident">all_demand</span>(<span class="ident">app</span>, <span class="ident">timer</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="macro">assert</span><span class="macro">!</span>(<span class="ident">app</span>.<span class="ident">primary</span>.<span class="ident">suspended_sim</span>.<span class="ident">is_none</span>());
        <span class="ident">app</span>.<span class="ident">primary</span>.<span class="ident">suspended_sim</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">app</span>.<span class="ident">primary</span>.<span class="ident">clear_sim</span>());

        <span class="kw">let</span> <span class="ident">hour</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">draw_all</span> <span class="op">=</span> <span class="ident">Demand</span>::<span class="ident">draw_demand</span>(<span class="ident">ctx</span>, <span class="ident">app</span>, <span class="kw-2">&amp;</span><span class="ident">all_demand</span>, <span class="ident">hour</span>);
        <span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">TrafficSignalDemand</span> {
            <span class="ident">all_demand</span>,
            <span class="ident">hour</span>,
            <span class="ident">draw_all</span>,
            <span class="ident">selected</span>: <span class="prelude-val">None</span>,
            <span class="ident">panel</span>: <span class="ident">Panel</span>::<span class="ident">new_builder</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="string">&quot;Traffic signal demand over time&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">Text</span>::<span class="ident">from_all</span>(<span class="macro">vec</span><span class="macro">!</span>[
                    <span class="ident">Line</span>(<span class="string">&quot;Press &quot;</span>),
                    <span class="ident">Key</span>::<span class="ident">LeftArrow</span>.<span class="ident">txt</span>(<span class="ident">ctx</span>),
                    <span class="ident">Line</span>(<span class="string">&quot; and &quot;</span>),
                    <span class="ident">Key</span>::<span class="ident">RightArrow</span>.<span class="ident">txt</span>(<span class="ident">ctx</span>),
                    <span class="ident">Line</span>(<span class="string">&quot; to adjust the hour&quot;</span>),
                ])
                .<span class="ident">into_widget</span>(<span class="ident">ctx</span>),
                <span class="ident">Widget</span>::<span class="ident">row</span>(<span class="macro">vec</span><span class="macro">!</span>[
                    <span class="string">&quot;Hour:&quot;</span>.<span class="ident">text_widget</span>(<span class="ident">ctx</span>).<span class="ident">centered_vert</span>(),
                    <span class="ident">Spinner</span>::<span class="ident">widget</span>(
                        <span class="ident">ctx</span>,
                        <span class="string">&quot;hour&quot;</span>,
                        (<span class="ident">Duration</span>::<span class="ident">ZERO</span>, <span class="ident">Duration</span>::<span class="ident">hours</span>(<span class="number">24</span>)),
                        <span class="ident">Duration</span>::<span class="ident">hours</span>(<span class="number">7</span>),
                        <span class="ident">Duration</span>::<span class="ident">hours</span>(<span class="number">1</span>),
                    ),
                ]),
            ]))
            .<span class="ident">aligned</span>(<span class="ident">HorizontalAlignment</span>::<span class="ident">Center</span>, <span class="ident">VerticalAlignment</span>::<span class="ident">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">TrafficSignalDemand</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="comment">// TODO Use MapspaceTooltips here?</span>
        <span class="kw">if</span> <span class="ident">ctx</span>.<span class="ident">redo_mouseover</span>() {
            <span class="self">self</span>.<span class="ident">selected</span> <span class="op">=</span> <span class="prelude-val">None</span>;
            <span class="ident">app</span>.<span class="ident">recalculate_current_selection</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</span>::<span class="ident">Intersection</span>(<span class="ident">i</span>)) <span class="op">=</span> <span class="ident">app</span>.<span class="ident">primary</span>.<span class="ident">current_selection</span>.<span class="ident">take</span>() {
                <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">ts</span>) <span class="op">=</span> <span class="ident">app</span>.<span class="ident">primary</span>.<span class="ident">map</span>.<span class="ident">maybe_get_traffic_signal</span>(<span class="ident">i</span>) {
                    <span class="comment">// If we&#39;re mousing over something, the cursor is on the map.</span>
                    <span class="kw">let</span> <span class="ident">pt</span> <span class="op">=</span> <span class="ident">ctx</span>.<span class="ident">canvas</span>.<span class="ident">get_cursor_in_map_space</span>().<span class="ident">unwrap</span>();
                    <span class="kw">for</span> (<span class="ident">arrow</span>, <span class="ident">count</span>) <span class="kw">in</span> <span class="self">self</span>.<span class="ident">all_demand</span>[<span class="kw-2">&amp;</span><span class="ident">i</span>].<span class="ident">make_arrows</span>(<span class="ident">ts</span>, <span class="self">self</span>.<span class="ident">hour</span>) {
                        <span class="kw">if</span> <span class="ident">arrow</span>.<span class="ident">contains_pt</span>(<span class="ident">pt</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="ident">batch</span>.<span class="ident">push</span>(<span class="ident">Color</span>::<span class="ident">hex</span>(<span class="string">&quot;#EE702E&quot;</span>), <span class="ident">arrow</span>.<span class="ident">clone</span>());
                            <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="ident">p</span>) <span class="op">=</span> <span class="ident">arrow</span>.<span class="ident">to_outline</span>(<span class="ident">Distance</span>::<span class="ident">meters</span>(<span class="number">0.1</span>)) {
                                <span class="ident">batch</span>.<span class="ident">push</span>(<span class="ident">Color</span>::<span class="ident">WHITE</span>, <span class="ident">p</span>);
                            }
                            <span class="kw">let</span> <span class="ident">txt</span> <span class="op">=</span> <span class="ident">Text</span>::<span class="ident">from</span>(<span class="macro">format</span><span class="macro">!</span>(
                                <span class="string">&quot;{} / {}&quot;</span>,
                                <span class="ident">prettyprint_usize</span>(<span class="ident">count</span>),
                                <span class="self">self</span>.<span class="ident">all_demand</span>[<span class="kw-2">&amp;</span><span class="ident">i</span>].<span class="ident">count</span>(<span class="self">self</span>.<span class="ident">hour</span>).<span class="ident">sum</span>()
                            ));
                            <span class="self">self</span>.<span class="ident">selected</span> <span class="op">=</span> <span class="prelude-val">Some</span>((<span class="ident">ctx</span>.<span class="ident">upload</span>(<span class="ident">batch</span>), <span class="ident">txt</span>));
                            <span class="kw">break</span>;
                        }
                    }
                }
            }
        }

        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">changed</span> <span class="op">=</span> <span class="bool-val">false</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="ident">app</span>.<span class="ident">primary</span>.<span class="ident">sim</span> <span class="op">=</span> <span class="ident">app</span>.<span class="ident">primary</span>.<span class="ident">suspended_sim</span>.<span class="ident">take</span>().<span class="ident">unwrap</span>();
                    <span class="kw">return</span> <span class="ident">Transition</span>::<span class="ident">Pop</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="ident">Outcome</span>::<span class="ident">Changed</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">&gt;</span> {
                <span class="ident">changed</span> <span class="op">=</span> <span class="bool-val">true</span>;
            }
            <span class="kw">_</span> <span class="op">=</span><span class="op">&gt;</span> {}
        }
        <span class="kw">if</span> <span class="ident">ctx</span>.<span class="ident">input</span>.<span class="ident">pressed</span>(<span class="ident">Key</span>::<span class="ident">LeftArrow</span>) {
            <span class="self">self</span>.<span class="ident">panel</span>
                .<span class="ident">modify_spinner</span>(<span class="ident">ctx</span>, <span class="string">&quot;hour&quot;</span>, <span class="op">-</span><span class="number">1.0</span> <span class="op">*</span> <span class="ident">Duration</span>::<span class="ident">hours</span>(<span class="number">1</span>));
            <span class="ident">changed</span> <span class="op">=</span> <span class="bool-val">true</span>;
        }
        <span class="kw">if</span> <span class="ident">ctx</span>.<span class="ident">input</span>.<span class="ident">pressed</span>(<span class="ident">Key</span>::<span class="ident">RightArrow</span>) {
            <span class="self">self</span>.<span class="ident">panel</span>.<span class="ident">modify_spinner</span>(<span class="ident">ctx</span>, <span class="string">&quot;hour&quot;</span>, <span class="ident">Duration</span>::<span class="ident">hours</span>(<span class="number">1</span>));
            <span class="ident">changed</span> <span class="op">=</span> <span class="bool-val">true</span>;
        }
        <span class="kw">if</span> <span class="ident">changed</span> {
            <span class="self">self</span>.<span class="ident">hour</span> <span class="op">=</span> <span class="ident">Time</span>::<span class="ident">START_OF_DAY</span> <span class="op">+</span> <span class="self">self</span>.<span class="ident">panel</span>.<span class="ident">spinner</span>(<span class="string">&quot;hour&quot;</span>);
            <span class="self">self</span>.<span class="ident">draw_all</span> <span class="op">=</span> <span class="ident">Demand</span>::<span class="ident">draw_demand</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">all_demand</span>, <span class="self">self</span>.<span class="ident">hour</span>);
        }

        <span class="ident">Transition</span>::<span class="ident">Keep</span>
    }

    <span class="kw">fn</span> <span class="ident">draw_baselayer</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">DrawBaselayer</span> {
        <span class="ident">DrawBaselayer</span>::<span class="ident">Custom</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">let</span> <span class="kw-2">mut</span> <span class="ident">opts</span> <span class="op">=</span> <span class="ident">DrawOptions</span>::<span class="ident">new</span>();
        <span class="ident">opts</span>.<span class="ident">suppress_traffic_signal_details</span>
            .<span class="ident">extend</span>(<span class="self">self</span>.<span class="ident">all_demand</span>.<span class="ident">keys</span>().<span class="ident">cloned</span>());
        <span class="ident">app</span>.<span class="ident">draw</span>(<span class="ident">g</span>, <span class="ident">opts</span>, <span class="kw-2">&amp;</span><span class="ident">ShowEverything</span>::<span class="ident">new</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_all</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">draw</span>, <span class="kw-2">ref</span> <span class="ident">count</span>)) <span class="op">=</span> <span class="self">self</span>.<span class="ident">selected</span> {
            <span class="ident">g</span>.<span class="ident">redraw</span>(<span class="ident">draw</span>);
            <span class="ident">g</span>.<span class="ident">draw_mouse_tooltip</span>(<span class="ident">count</span>.<span class="ident">clone</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>);
    }
}

<span class="kw">struct</span> <span class="ident">Demand</span> {
    <span class="comment">// Unsorted</span>
    <span class="ident">raw</span>: <span class="ident">Vec</span><span class="op">&lt;</span>(<span class="ident">Time</span>, <span class="ident">MovementID</span>)<span class="op">&gt;</span>,
}

<span class="kw">impl</span> <span class="ident">Demand</span> {
    <span class="kw">fn</span> <span class="ident">all_demand</span>(<span class="ident">app</span>: <span class="kw-2">&amp;</span><span class="ident">App</span>, <span class="ident">timer</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Timer</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">HashMap</span><span class="op">&lt;</span><span class="ident">IntersectionID</span>, <span class="ident">Demand</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">all_demand</span> <span class="op">=</span> <span class="ident">HashMap</span>::<span class="ident">new</span>();
        <span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="ident">map</span>.<span class="ident">all_intersections</span>() {
            <span class="kw">if</span> <span class="ident">i</span>.<span class="ident">is_traffic_signal</span>() {
                <span class="ident">all_demand</span>.<span class="ident">insert</span>(<span class="ident">i</span>.<span class="ident">id</span>, <span class="ident">Demand</span> { <span class="ident">raw</span>: <span class="ident">Vec</span>::<span class="ident">new</span>() });
            }
        }

        <span class="kw">let</span> <span class="ident">paths</span> <span class="op">=</span> <span class="ident">timer</span>
            .<span class="ident">parallelize</span>(
                <span class="string">&quot;predict routes&quot;</span>,
                <span class="ident">Parallelism</span>::<span class="ident">Fastest</span>,
                <span class="ident">app</span>.<span class="ident">primary</span>.<span class="ident">sim</span>.<span class="ident">all_trip_info</span>(),
                <span class="op">|</span>(<span class="kw">_</span>, <span class="ident">trip</span>)<span class="op">|</span> {
                    <span class="kw">let</span> <span class="ident">departure</span> <span class="op">=</span> <span class="ident">trip</span>.<span class="ident">departure</span>;
                    <span class="ident">TripEndpoint</span>::<span class="ident">path_req</span>(<span class="ident">trip</span>.<span class="ident">start</span>, <span class="ident">trip</span>.<span class="ident">end</span>, <span class="ident">trip</span>.<span class="ident">mode</span>, <span class="ident">map</span>)
                        .<span class="ident">and_then</span>(<span class="op">|</span><span class="ident">req</span><span class="op">|</span> <span class="ident">map</span>.<span class="ident">pathfind</span>(<span class="ident">req</span>).<span class="ident">ok</span>())
                        .<span class="ident">map</span>(<span class="op">|</span><span class="ident">path</span><span class="op">|</span> (<span class="ident">departure</span>, <span class="ident">path</span>))
                },
            )
            .<span class="ident">into_iter</span>()
            .<span class="ident">flatten</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">timer</span>.<span class="ident">start_iter</span>(<span class="string">&quot;compute demand&quot;</span>, <span class="ident">paths</span>.<span class="ident">len</span>());
        <span class="kw">for</span> (<span class="ident">now</span>, <span class="ident">path</span>) <span class="kw">in</span> <span class="ident">paths</span> {
            <span class="ident">timer</span>.<span class="ident">next</span>();
            <span class="comment">// TODO For every step, increase &#39;now&#39; by the best-case time to cross that step.</span>
            <span class="kw">for</span> <span class="ident">step</span> <span class="kw">in</span> <span class="ident">path</span>.<span class="ident">get_steps</span>() {
                <span class="kw">match</span> <span class="ident">step</span> {
                    <span class="ident">PathStep</span>::<span class="ident">Lane</span>(<span class="kw">_</span>) <span class="op">|</span> <span class="ident">PathStep</span>::<span class="ident">ContraflowLane</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">&gt;</span> {}
                    <span class="ident">PathStep</span>::<span class="ident">Turn</span>(<span class="ident">t</span>) <span class="op">=</span><span class="op">&gt;</span> {
                        <span class="kw">if</span> <span class="ident">map</span>.<span class="ident">get_t</span>(<span class="kw-2">*</span><span class="ident">t</span>).<span class="ident">turn_type</span> <span class="op">=</span><span class="op">=</span> <span class="ident">TurnType</span>::<span class="ident">SharedSidewalkCorner</span> {
                            <span class="kw">continue</span>;
                        }
                        <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">demand</span>) <span class="op">=</span> <span class="ident">all_demand</span>.<span class="ident">get_mut</span>(<span class="kw-2">&amp;</span><span class="ident">t</span>.<span class="ident">parent</span>) {
                            <span class="ident">demand</span>
                                .<span class="ident">raw</span>
                                .<span class="ident">push</span>((<span class="ident">now</span>, <span class="ident">map</span>.<span class="ident">get_traffic_signal</span>(<span class="ident">t</span>.<span class="ident">parent</span>).<span class="ident">turn_to_movement</span>(<span class="kw-2">*</span><span class="ident">t</span>)));
                        }
                    }
                }
            }
        }

        <span class="ident">all_demand</span>
    }

    <span class="kw">fn</span> <span class="ident">count</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">start</span>: <span class="ident">Time</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Counter</span><span class="op">&lt;</span><span class="ident">MovementID</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="ident">end</span> <span class="op">=</span> <span class="ident">start</span> <span class="op">+</span> <span class="ident">Duration</span>::<span class="ident">hours</span>(<span class="number">1</span>);
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">cnt</span> <span class="op">=</span> <span class="ident">Counter</span>::<span class="ident">new</span>();
        <span class="kw">for</span> (<span class="ident">t</span>, <span class="ident">m</span>) <span class="kw">in</span> <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">raw</span> {
            <span class="kw">if</span> <span class="kw-2">*</span><span class="ident">t</span> <span class="op">&gt;</span><span class="op">=</span> <span class="ident">start</span> <span class="op">&amp;&amp;</span> <span class="kw-2">*</span><span class="ident">t</span> <span class="op">&lt;</span><span class="op">=</span> <span class="ident">end</span> {
                <span class="ident">cnt</span>.<span class="ident">inc</span>(<span class="kw-2">*</span><span class="ident">m</span>);
            }
        }
        <span class="ident">cnt</span>
    }

    <span class="kw">fn</span> <span class="ident">make_arrows</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">ts</span>: <span class="kw-2">&amp;</span><span class="ident">ControlTrafficSignal</span>, <span class="ident">hour</span>: <span class="ident">Time</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Vec</span><span class="op">&lt;</span>(<span class="ident">Polygon</span>, <span class="ident">usize</span>)<span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="ident">cnt</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">count</span>(<span class="ident">hour</span>);
        <span class="kw">let</span> <span class="ident">total_demand</span> <span class="op">=</span> <span class="ident">cnt</span>.<span class="ident">sum</span>() <span class="kw">as</span> <span class="ident">f64</span>;

        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">arrows</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
        <span class="kw">for</span> (<span class="ident">m</span>, <span class="ident">demand</span>) <span class="kw">in</span> <span class="ident">cnt</span>.<span class="ident">consume</span>() {
            <span class="kw">let</span> <span class="ident">percent</span> <span class="op">=</span> (<span class="ident">demand</span> <span class="kw">as</span> <span class="ident">f64</span>) <span class="op">/</span> <span class="ident">total_demand</span>;
            <span class="kw">let</span> <span class="ident">arrow</span> <span class="op">=</span> <span class="ident">ts</span>.<span class="ident">movements</span>[<span class="kw-2">&amp;</span><span class="ident">m</span>]
                .<span class="ident">geom</span>
                .<span class="ident">make_arrow</span>(<span class="ident">percent</span> <span class="op">*</span> <span class="ident">Distance</span>::<span class="ident">meters</span>(<span class="number">3.0</span>), <span class="ident">ArrowCap</span>::<span class="ident">Triangle</span>);
            <span class="ident">arrows</span>.<span class="ident">push</span>((<span class="ident">arrow</span>, <span class="ident">demand</span>));
        }
        <span class="ident">arrows</span>
    }

    <span class="kw">fn</span> <span class="ident">draw_demand</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">all_demand</span>: <span class="kw-2">&amp;</span><span class="ident">HashMap</span><span class="op">&lt;</span><span class="ident">IntersectionID</span>, <span class="ident">Demand</span><span class="op">&gt;</span>,
        <span class="ident">hour</span>: <span class="ident">Time</span>,
    ) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Drawable</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="kw">for</span> (<span class="ident">i</span>, <span class="ident">demand</span>) <span class="kw">in</span> <span class="ident">all_demand</span> {
            <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">outlines</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
            <span class="kw">for</span> (<span class="ident">arrow</span>, <span class="kw">_</span>) <span class="kw">in</span> <span class="ident">demand</span>.<span class="ident">make_arrows</span>(<span class="ident">app</span>.<span class="ident">primary</span>.<span class="ident">map</span>.<span class="ident">get_traffic_signal</span>(<span class="kw-2">*</span><span class="ident">i</span>), <span class="ident">hour</span>) {
                <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="ident">p</span>) <span class="op">=</span> <span class="ident">arrow</span>.<span class="ident">to_outline</span>(<span class="ident">Distance</span>::<span class="ident">meters</span>(<span class="number">0.1</span>)) {
                    <span class="ident">outlines</span>.<span class="ident">push</span>(<span class="ident">p</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;#A3A3A3&quot;</span>), <span class="ident">arrow</span>);
            }
            <span class="ident">batch</span>.<span class="ident">extend</span>(<span class="ident">Color</span>::<span class="ident">WHITE</span>, <span class="ident">outlines</span>);
        }
        <span class="ident">ctx</span>.<span class="ident">upload</span>(<span class="ident">batch</span>)
    }
}
</pre></div>
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