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</pre><div class="example-wrap"><pre class="rust ">
<span class="kw">use</span> <span class="ident">abstio::MapName</span>;
<span class="kw">use</span> <span class="ident">abstutil</span>::{<span class="ident">CmdArgs</span>, <span class="ident">Timer</span>};
<span class="kw">use</span> <span class="ident">geom</span>::{<span class="ident">Circle</span>, <span class="ident">Distance</span>, <span class="ident">Duration</span>, <span class="ident">Pt2D</span>, <span class="ident">Time</span>};
<span class="kw">use</span> <span class="ident">map_model</span>::{<span class="ident">IntersectionID</span>, <span class="ident">Map</span>};
<span class="kw">use</span> <span class="ident">sim::Sim</span>;
<span class="kw">use</span> <span class="ident">widgetry</span>::{<span class="ident">Canvas</span>, <span class="ident">EventCtx</span>, <span class="ident">GfxCtx</span>, <span class="ident">SharedAppState</span>, <span class="ident">State</span>, <span class="ident">Transition</span>, <span class="ident">Warper</span>};

<span class="kw">use</span> <span class="kw">crate</span><span class="ident">::colors::ColorScheme</span>;
<span class="kw">use</span> <span class="kw">crate</span><span class="ident">::load::MapLoader</span>;
<span class="kw">use</span> <span class="kw">crate</span><span class="ident">::options::Options</span>;
<span class="kw">use</span> <span class="kw">crate</span><span class="ident">::render::DrawMap</span>;
<span class="kw">use</span> <span class="kw">crate</span><span class="ident">::render</span>::{<span class="ident">DrawOptions</span>, <span class="ident">Renderable</span>};
<span class="kw">use</span> <span class="kw">crate</span><span class="ident">::tools</span>::{<span class="ident">CameraState</span>, <span class="ident">URLManager</span>};
<span class="kw">use</span> <span class="kw">crate</span>::{<span class="ident">AppLike</span>, <span class="ident">ID</span>};

<span class="doccomment">/// Simple app state that just renders a static map, without any dynamic agents on the map.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">SimpleApp</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
    <span class="kw">pub</span> <span class="ident">map</span>: <span class="ident">Map</span>,
    <span class="kw">pub</span> <span class="ident">draw_map</span>: <span class="ident">DrawMap</span>,
    <span class="kw">pub</span> <span class="ident">cs</span>: <span class="ident">ColorScheme</span>,
    <span class="kw">pub</span> <span class="ident">opts</span>: <span class="ident">Options</span>,
    <span class="kw">pub</span> <span class="ident">current_selection</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">ID</span><span class="op">&gt;</span>,
    <span class="doccomment">/// Custom per-app state can be stored here</span>
    <span class="kw">pub</span> <span class="ident">session</span>: <span class="ident">T</span>,
    <span class="doccomment">/// If desired, this can be advanced to render traffic signals changing.</span>
    <span class="kw">pub</span> <span class="ident">time</span>: <span class="ident">Time</span>,
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="lifetime">&#39;static</span><span class="op">&gt;</span> <span class="ident">SimpleApp</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span><span class="op">&lt;</span>
        <span class="ident">F</span>: <span class="lifetime">&#39;static</span> <span class="op">+</span> <span class="ident">Fn</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">EventCtx</span>, <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">SimpleApp</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">Vec</span><span class="op">&lt;</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">SimpleApp</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span><span class="op">&gt;</span><span class="op">&gt;</span><span class="op">&gt;</span>,
    <span class="op">&gt;</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="kw-2">mut</span> <span class="ident">opts</span>: <span class="ident">Options</span>,
        <span class="ident">session</span>: <span class="ident">T</span>,
        <span class="ident">init_states</span>: <span class="ident">F</span>,
    ) <span class="op">-</span><span class="op">&gt;</span> (<span class="ident">SimpleApp</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>, <span class="ident">Vec</span><span class="op">&lt;</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">SimpleApp</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span><span class="op">&gt;</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">args</span> <span class="op">=</span> <span class="ident">CmdArgs::new</span>();
        <span class="ident">opts</span>.<span class="ident">update_from_args</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">args</span>);
        <span class="kw">let</span> <span class="ident">map_name</span> <span class="op">=</span> <span class="ident">args</span>
            .<span class="ident">optional_free</span>()
            .<span class="ident">map</span>(<span class="op">|</span><span class="ident">path</span><span class="op">|</span> {
                <span class="ident">MapName::from_path</span>(<span class="kw-2">&amp;</span><span class="ident">path</span>).<span class="ident">unwrap_or_else</span>(<span class="op">|</span><span class="op">|</span> <span class="macro">panic!</span>(<span class="string">&quot;bad map path: {}&quot;</span>, <span class="ident">path</span>))
            })
            .<span class="ident">or_else</span>(<span class="op">|</span><span class="op">|</span> {
                <span class="ident">abstio::maybe_read_json</span>::<span class="op">&lt;</span><span class="kw">crate</span><span class="ident">::tools::DefaultMap</span><span class="op">&gt;</span>(
                    <span class="ident">abstio::path_player</span>(<span class="string">&quot;maps.json&quot;</span>),
                    <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Timer::throwaway</span>(),
                )
                .<span class="ident">ok</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">last_map</span>)
            })
            .<span class="ident">unwrap_or_else</span>(<span class="op">|</span><span class="op">|</span> <span class="ident">MapName::seattle</span>(<span class="string">&quot;montlake&quot;</span>));
        <span class="kw">let</span> <span class="ident">center_camera</span> <span class="op">=</span> <span class="ident">args</span>.<span class="ident">optional</span>(<span class="string">&quot;--cam&quot;</span>);
        <span class="ident">args</span>.<span class="ident">done</span>();

        <span class="kw">let</span> <span class="ident">cs</span> <span class="op">=</span> <span class="ident">ColorScheme::new</span>(<span class="ident">ctx</span>, <span class="ident">opts</span>.<span class="ident">color_scheme</span>);
        <span class="comment">// Start with a blank map</span>
        <span class="kw">let</span> <span class="ident">map</span> <span class="op">=</span> <span class="ident">Map::blank</span>();
        <span class="kw">let</span> <span class="ident">draw_map</span> <span class="op">=</span> <span class="ident">DrawMap::new</span>(<span class="ident">ctx</span>, <span class="kw-2">&amp;</span><span class="ident">map</span>, <span class="kw-2">&amp;</span><span class="ident">opts</span>, <span class="kw-2">&amp;</span><span class="ident">cs</span>, <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Timer::throwaway</span>());
        <span class="kw">let</span> <span class="ident">app</span> <span class="op">=</span> <span class="ident">SimpleApp</span> {
            <span class="ident">map</span>,
            <span class="ident">draw_map</span>,
            <span class="ident">cs</span>,
            <span class="ident">opts</span>,
            <span class="ident">current_selection</span>: <span class="prelude-val">None</span>,
            <span class="ident">session</span>,
            <span class="ident">time</span>: <span class="ident">Time::START_OF_DAY</span>,
        };

        <span class="kw">let</span> <span class="ident">states</span> <span class="op">=</span> <span class="macro">vec!</span>[<span class="ident">MapLoader::new_state</span>(
            <span class="ident">ctx</span>,
            <span class="kw-2">&amp;</span><span class="ident">app</span>,
            <span class="ident">map_name</span>,
            <span class="ident">Box::new</span>(<span class="kw">move</span> <span class="op">|</span><span class="ident">ctx</span>, <span class="ident">app</span><span class="op">|</span> {
                <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>((<span class="ident">pt</span>, <span class="ident">zoom</span>)) <span class="op">=</span>
                    <span class="ident">center_camera</span>.<span class="ident">and_then</span>(<span class="op">|</span><span class="ident">cam</span><span class="op">|</span> <span class="ident">URLManager::parse_center_camera</span>(<span class="ident">app</span>, <span class="ident">cam</span>))
                {
                    <span class="ident">ctx</span>.<span class="ident">canvas</span>.<span class="ident">cam_zoom</span> <span class="op">=</span> <span class="ident">zoom</span>;
                    <span class="ident">ctx</span>.<span class="ident">canvas</span>.<span class="ident">center_on_map_pt</span>(<span class="ident">pt</span>);
                }
                <span class="ident">Transition::Clear</span>(<span class="ident">init_states</span>(<span class="ident">ctx</span>, <span class="ident">app</span>))
            }),
        )];
        (<span class="ident">app</span>, <span class="ident">states</span>)
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">draw_unzoomed</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">clear</span>(<span class="self">self</span>.<span class="ident">cs</span>.<span class="ident">void_background</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_map</span>.<span class="ident">boundary_polygon</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_map</span>.<span class="ident">draw_all_areas</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_map</span>.<span class="ident">draw_all_unzoomed_parking_lots</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_map</span>.<span class="ident">draw_all_unzoomed_roads_and_intersections</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_map</span>.<span class="ident">draw_all_buildings</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_map</span>.<span class="ident">draw_all_building_outlines</span>);
        <span class="comment">// Not the building paths</span>

        <span class="comment">// Still show some shape selection when zoomed out.</span>
        <span class="comment">// TODO Refactor! Ideally use get_obj</span>
        <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">ID::Area</span>(<span class="ident">id</span>)) <span class="op">=</span> <span class="self">self</span>.<span class="ident">current_selection</span> {
            <span class="ident">g</span>.<span class="ident">draw_polygon</span>(
                <span class="self">self</span>.<span class="ident">cs</span>.<span class="ident">selected</span>,
                <span class="self">self</span>.<span class="ident">draw_map</span>.<span class="ident">get_a</span>(<span class="ident">id</span>).<span class="ident">get_outline</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">map</span>),
            );
        } <span class="kw">else</span> <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">ID::Road</span>(<span class="ident">id</span>)) <span class="op">=</span> <span class="self">self</span>.<span class="ident">current_selection</span> {
            <span class="ident">g</span>.<span class="ident">draw_polygon</span>(
                <span class="self">self</span>.<span class="ident">cs</span>.<span class="ident">selected</span>,
                <span class="self">self</span>.<span class="ident">draw_map</span>.<span class="ident">get_r</span>(<span class="ident">id</span>).<span class="ident">get_outline</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">map</span>),
            );
        } <span class="kw">else</span> <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">ID::Intersection</span>(<span class="ident">id</span>)) <span class="op">=</span> <span class="self">self</span>.<span class="ident">current_selection</span> {
            <span class="comment">// Actually, don&#39;t use get_outline here! Full polygon is easier to see.</span>
            <span class="ident">g</span>.<span class="ident">draw_polygon</span>(<span class="self">self</span>.<span class="ident">cs</span>.<span class="ident">selected</span>, <span class="self">self</span>.<span class="ident">map</span>.<span class="ident">get_i</span>(<span class="ident">id</span>).<span class="ident">polygon</span>.<span class="ident">clone</span>());
        } <span class="kw">else</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">id</span>)) <span class="op">=</span> <span class="self">self</span>.<span class="ident">current_selection</span> {
            <span class="ident">g</span>.<span class="ident">draw_polygon</span>(<span class="self">self</span>.<span class="ident">cs</span>.<span class="ident">selected</span>, <span class="self">self</span>.<span class="ident">map</span>.<span class="ident">get_b</span>(<span class="ident">id</span>).<span class="ident">polygon</span>.<span class="ident">clone</span>());
        }
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">draw_zoomed</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">opts</span>: <span class="ident">DrawOptions</span>) {
        <span class="ident">g</span>.<span class="ident">clear</span>(<span class="self">self</span>.<span class="ident">cs</span>.<span class="ident">void_background</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_map</span>.<span class="ident">boundary_polygon</span>);

        <span class="kw">let</span> <span class="ident">objects</span> <span class="op">=</span> <span class="self">self</span>
            .<span class="ident">draw_map</span>
            .<span class="ident">get_renderables_back_to_front</span>(<span class="ident">g</span>.<span class="ident">get_screen_bounds</span>(), <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">map</span>);

        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">drawn_all_buildings</span> <span class="op">=</span> <span class="bool-val">false</span>;
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">drawn_all_areas</span> <span class="op">=</span> <span class="bool-val">false</span>;

        <span class="kw">for</span> <span class="ident">obj</span> <span class="kw">in</span> <span class="ident">objects</span> {
            <span class="ident">obj</span>.<span class="ident">draw</span>(<span class="ident">g</span>, <span class="self">self</span>, <span class="kw-2">&amp;</span><span class="ident">opts</span>);

            <span class="kw">match</span> <span class="ident">obj</span>.<span class="ident">get_id</span>() {
                <span class="ident">ID::Building</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">&gt;</span> {
                    <span class="kw">if</span> <span class="op">!</span><span class="ident">drawn_all_buildings</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_map</span>.<span class="ident">draw_all_buildings</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_map</span>.<span class="ident">draw_all_building_outlines</span>);
                        <span class="ident">drawn_all_buildings</span> <span class="op">=</span> <span class="bool-val">true</span>;
                    }
                }
                <span class="ident">ID::Area</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">&gt;</span> {
                    <span class="kw">if</span> <span class="op">!</span><span class="ident">drawn_all_areas</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_map</span>.<span class="ident">draw_all_areas</span>);
                        <span class="ident">drawn_all_areas</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="self">self</span>.<span class="ident">current_selection</span> <span class="op">=</span><span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">obj</span>.<span class="ident">get_id</span>()) {
                <span class="ident">g</span>.<span class="ident">draw_polygon</span>(<span class="self">self</span>.<span class="ident">cs</span>.<span class="ident">selected</span>, <span class="ident">obj</span>.<span class="ident">get_outline</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">map</span>));
            }
        }
    }

    <span class="doccomment">/// Assumes some defaults.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">recalculate_current_selection</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="ident">EventCtx</span>) {
        <span class="self">self</span>.<span class="ident">current_selection</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">calculate_current_selection</span>(<span class="ident">ctx</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>);
    }

    <span class="comment">// TODO Returns anything; I think it should just return roads</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">mouseover_unzoomed_roads_and_intersections</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">ctx</span>: <span class="kw-2">&amp;</span><span class="ident">EventCtx</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">ID</span><span class="op">&gt;</span> {
        <span class="self">self</span>.<span class="ident">calculate_current_selection</span>(<span class="ident">ctx</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>)
    }
    <span class="doccomment">/// Only select buildings, and work whether zoomed in or not.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">mouseover_unzoomed_buildings</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">ctx</span>: <span class="kw-2">&amp;</span><span class="ident">EventCtx</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">ID</span><span class="op">&gt;</span> {
        <span class="self">self</span>.<span class="ident">calculate_current_selection</span>(<span class="ident">ctx</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>)
            .<span class="ident">filter</span>(<span class="op">|</span><span class="ident">id</span><span class="op">|</span> <span class="macro">matches!</span>(<span class="ident">id</span>, <span class="ident">ID::Building</span>(<span class="kw">_</span>)))
    }

    <span class="kw">fn</span> <span class="ident">calculate_current_selection</span>(
        <span class="kw-2">&amp;</span><span class="self">self</span>,
        <span class="ident">ctx</span>: <span class="kw-2">&amp;</span><span class="ident">EventCtx</span>,
        <span class="ident">unzoomed_roads_and_intersections</span>: <span class="ident">bool</span>,
        <span class="ident">unzoomed_buildings</span>: <span class="ident">bool</span>,
    ) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">ID</span><span class="op">&gt;</span> {
        <span class="comment">// Unzoomed mode. Ignore when debugging areas.</span>
        <span class="kw">if</span> <span class="ident">ctx</span>.<span class="ident">canvas</span>.<span class="ident">cam_zoom</span> <span class="op">&lt;</span> <span class="self">self</span>.<span class="ident">opts</span>.<span class="ident">min_zoom_for_detail</span>
            <span class="op">&amp;&amp;</span> <span class="op">!</span>(<span class="ident">unzoomed_roads_and_intersections</span> <span class="op">|</span><span class="op">|</span> <span class="ident">unzoomed_buildings</span>)
        {
            <span class="kw">return</span> <span class="prelude-val">None</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="question-mark">?</span>;

        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">objects</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">draw_map</span>.<span class="ident">get_renderables_back_to_front</span>(
            <span class="ident">Circle::new</span>(<span class="ident">pt</span>, <span class="ident">Distance::meters</span>(<span class="number">3.0</span>)).<span class="ident">get_bounds</span>(),
            <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">map</span>,
        );
        <span class="ident">objects</span>.<span class="ident">reverse</span>();

        <span class="kw">for</span> <span class="ident">obj</span> <span class="kw">in</span> <span class="ident">objects</span> {
            <span class="kw">match</span> <span class="ident">obj</span>.<span class="ident">get_id</span>() {
                <span class="ident">ID::Road</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">&gt;</span> {
                    <span class="kw">if</span> <span class="op">!</span><span class="ident">unzoomed_roads_and_intersections</span>
                        <span class="op">|</span><span class="op">|</span> <span class="ident">ctx</span>.<span class="ident">canvas</span>.<span class="ident">cam_zoom</span> <span class="op">&gt;</span><span class="op">=</span> <span class="self">self</span>.<span class="ident">opts</span>.<span class="ident">min_zoom_for_detail</span>
                    {
                        <span class="kw">continue</span>;
                    }
                }
                <span class="ident">ID::Intersection</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">canvas</span>.<span class="ident">cam_zoom</span> <span class="op">&lt;</span> <span class="self">self</span>.<span class="ident">opts</span>.<span class="ident">min_zoom_for_detail</span>
                        <span class="op">&amp;&amp;</span> <span class="op">!</span><span class="ident">unzoomed_roads_and_intersections</span>
                    {
                        <span class="kw">continue</span>;
                    }
                }
                <span class="ident">ID::Building</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">canvas</span>.<span class="ident">cam_zoom</span> <span class="op">&lt;</span> <span class="self">self</span>.<span class="ident">opts</span>.<span class="ident">min_zoom_for_detail</span> <span class="op">&amp;&amp;</span> <span class="op">!</span><span class="ident">unzoomed_buildings</span> {
                        <span class="kw">continue</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">canvas</span>.<span class="ident">cam_zoom</span> <span class="op">&lt;</span> <span class="self">self</span>.<span class="ident">opts</span>.<span class="ident">min_zoom_for_detail</span> {
                        <span class="kw">continue</span>;
                    }
                }
            }
            <span class="kw">if</span> <span class="ident">obj</span>.<span class="ident">contains_pt</span>(<span class="ident">pt</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">map</span>) {
                <span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="ident">obj</span>.<span class="ident">get_id</span>());
            }
        }
        <span class="prelude-val">None</span>
    }
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="lifetime">&#39;static</span><span class="op">&gt;</span> <span class="ident">AppLike</span> <span class="kw">for</span> <span class="ident">SimpleApp</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
    <span class="attribute">#[<span class="ident">inline</span>]</span>
    <span class="kw">fn</span> <span class="ident">map</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="kw-2">&amp;</span><span class="ident">Map</span> {
        <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">map</span>
    }
    <span class="attribute">#[<span class="ident">inline</span>]</span>
    <span class="kw">fn</span> <span class="ident">sim</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="kw-2">&amp;</span><span class="ident">Sim</span> {
        <span class="macro">unreachable!</span>()
    }
    <span class="attribute">#[<span class="ident">inline</span>]</span>
    <span class="kw">fn</span> <span class="ident">cs</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="kw-2">&amp;</span><span class="ident">ColorScheme</span> {
        <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">cs</span>
    }
    <span class="attribute">#[<span class="ident">inline</span>]</span>
    <span class="kw">fn</span> <span class="ident">mut_cs</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">ColorScheme</span> {
        <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">cs</span>
    }
    <span class="attribute">#[<span class="ident">inline</span>]</span>
    <span class="kw">fn</span> <span class="ident">draw_map</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="kw-2">&amp;</span><span class="ident">DrawMap</span> {
        <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">draw_map</span>
    }
    <span class="attribute">#[<span class="ident">inline</span>]</span>
    <span class="kw">fn</span> <span class="ident">mut_draw_map</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">DrawMap</span> {
        <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">draw_map</span>
    }
    <span class="attribute">#[<span class="ident">inline</span>]</span>
    <span class="kw">fn</span> <span class="ident">opts</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="kw-2">&amp;</span><span class="ident">Options</span> {
        <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">opts</span>
    }
    <span class="attribute">#[<span class="ident">inline</span>]</span>
    <span class="kw">fn</span> <span class="ident">mut_opts</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Options</span> {
        <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">opts</span>
    }

    <span class="kw">fn</span> <span class="ident">map_switched</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">map</span>: <span class="ident">Map</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="ident">CameraState::save</span>(<span class="ident">ctx</span>.<span class="ident">canvas</span>, <span class="self">self</span>.<span class="ident">map</span>.<span class="ident">get_name</span>());
        <span class="self">self</span>.<span class="ident">map</span> <span class="op">=</span> <span class="ident">map</span>;
        <span class="self">self</span>.<span class="ident">draw_map</span> <span class="op">=</span> <span class="ident">DrawMap::new</span>(<span class="ident">ctx</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">map</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">opts</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">cs</span>, <span class="ident">timer</span>);
        <span class="ident">CameraState::load</span>(<span class="ident">ctx</span>, <span class="self">self</span>.<span class="ident">map</span>.<span class="ident">get_name</span>());
    }

    <span class="kw">fn</span> <span class="ident">draw_with_opts</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">opts</span>: <span class="ident">DrawOptions</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="self">self</span>.<span class="ident">opts</span>.<span class="ident">min_zoom_for_detail</span> {
            <span class="self">self</span>.<span class="ident">draw_unzoomed</span>(<span class="ident">g</span>);
        } <span class="kw">else</span> {
            <span class="self">self</span>.<span class="ident">draw_zoomed</span>(<span class="ident">g</span>, <span class="ident">opts</span>);
        }
    }

    <span class="kw">fn</span> <span class="ident">make_warper</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="ident">EventCtx</span>,
        <span class="ident">pt</span>: <span class="ident">Pt2D</span>,
        <span class="ident">target_cam_zoom</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">f64</span><span class="op">&gt;</span>,
        <span class="kw">_</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">ID</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">SimpleApp</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span><span class="op">&gt;</span><span class="op">&gt;</span> {
        <span class="ident">Box::new</span>(<span class="ident">SimpleWarper</span> {
            <span class="ident">warper</span>: <span class="ident">Warper::new</span>(<span class="ident">ctx</span>, <span class="ident">pt</span>, <span class="ident">target_cam_zoom</span>),
        })
    }

    <span class="kw">fn</span> <span class="ident">sim_time</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Time</span> {
        <span class="self">self</span>.<span class="ident">time</span>
    }

    <span class="kw">fn</span> <span class="ident">current_stage_and_remaining_time</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">id</span>: <span class="ident">IntersectionID</span>) <span class="op">-</span><span class="op">&gt;</span> (<span class="ident">usize</span>, <span class="ident">Duration</span>) {
        <span class="kw">let</span> <span class="ident">signal</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">map</span>.<span class="ident">get_traffic_signal</span>(<span class="ident">id</span>);
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">time_left</span> <span class="op">=</span> (<span class="self">self</span>.<span class="ident">time</span> <span class="op">-</span> <span class="ident">Time::START_OF_DAY</span>) <span class="op">%</span> <span class="ident">signal</span>.<span class="ident">simple_cycle_duration</span>();
        <span class="kw">for</span> (<span class="ident">idx</span>, <span class="ident">stage</span>) <span class="kw">in</span> <span class="ident">signal</span>.<span class="ident">stages</span>.<span class="ident">iter</span>().<span class="ident">enumerate</span>() {
            <span class="kw">if</span> <span class="ident">time_left</span> <span class="op">&lt;</span> <span class="ident">stage</span>.<span class="ident">stage_type</span>.<span class="ident">simple_duration</span>() {
                <span class="kw">return</span> (<span class="ident">idx</span>, <span class="ident">time_left</span>);
            }
            <span class="ident">time_left</span> <span class="op">-</span><span class="op">=</span> <span class="ident">stage</span>.<span class="ident">stage_type</span>.<span class="ident">simple_duration</span>();
        }
        <span class="macro">unreachable!</span>()
    }
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="lifetime">&#39;static</span><span class="op">&gt;</span> <span class="ident">SharedAppState</span> <span class="kw">for</span> <span class="ident">SimpleApp</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
    <span class="kw">fn</span> <span class="ident">draw_default</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="self">self</span>.<span class="ident">draw_with_opts</span>(<span class="ident">g</span>, <span class="ident">DrawOptions::new</span>());
    }

    <span class="kw">fn</span> <span class="ident">dump_before_abort</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">canvas</span>: <span class="kw-2">&amp;</span><span class="ident">Canvas</span>) {
        <span class="ident">CameraState::save</span>(<span class="ident">canvas</span>, <span class="self">self</span>.<span class="ident">map</span>.<span class="ident">get_name</span>());
    }

    <span class="kw">fn</span> <span class="ident">before_quit</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">canvas</span>: <span class="kw-2">&amp;</span><span class="ident">Canvas</span>) {
        <span class="ident">CameraState::save</span>(<span class="ident">canvas</span>, <span class="self">self</span>.<span class="ident">map</span>.<span class="ident">get_name</span>());
    }

    <span class="kw">fn</span> <span class="ident">free_memory</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) {
        <span class="self">self</span>.<span class="ident">draw_map</span>.<span class="ident">free_memory</span>();
    }
}

<span class="kw">struct</span> <span class="ident">SimpleWarper</span> {
    <span class="ident">warper</span>: <span class="ident">Warper</span>,
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> <span class="ident">State</span><span class="op">&lt;</span><span class="ident">SimpleApp</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">SimpleWarper</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="kw">_</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">SimpleApp</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">Transition</span><span class="op">&lt;</span><span class="ident">SimpleApp</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span><span class="op">&gt;</span> {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">warper</span>.<span class="ident">event</span>(<span class="ident">ctx</span>) {
            <span class="ident">Transition::Keep</span>
        } <span class="kw">else</span> {
            <span class="ident">Transition::Pop</span>
        }
    }

    <span class="kw">fn</span> <span class="ident">draw</span>(<span class="kw-2">&amp;</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">GfxCtx</span>, <span class="kw">_</span>: <span class="kw-2">&amp;</span><span class="ident">SimpleApp</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>) {}
}
</pre></div>
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