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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">std</span>::<span class="ident">fmt</span>::<span class="ident">Debug</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">hash</span>::<span class="ident">Hash</span>;

<span class="kw">use</span> <span class="ident">aabb_quadtree</span>::{<span class="ident">ItemId</span>, <span class="ident">QuadTree</span>};

<span class="kw">use</span> <span class="ident">geom</span>::{<span class="ident">Bounds</span>, <span class="ident">Circle</span>, <span class="ident">Distance</span>, <span class="ident">Polygon</span>, <span class="ident">Pt2D</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="kw">pub</span> <span class="kw">trait</span> <span class="ident">ObjectID</span>: <span class="ident">Clone</span> <span class="op">+</span> <span class="ident">Copy</span> <span class="op">+</span> <span class="ident">Debug</span> <span class="op">+</span> <span class="ident">Eq</span> <span class="op">+</span> <span class="ident">Hash</span> {
    <span class="comment">// Higher shows up in the front.</span>
    <span class="kw">fn</span> <span class="ident">zorder</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">usize</span>;
}

<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Object</span><span class="op">&lt;</span><span class="ident">ID</span>: <span class="ident">ObjectID</span><span class="op">&gt;</span> {
    <span class="ident">id</span>: <span class="ident">ID</span>,
    <span class="ident">geometry</span>: <span class="ident">Vec</span><span class="op">&lt;</span>(<span class="ident">Color</span>, <span class="ident">Polygon</span>)<span class="op">&gt;</span>,
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">ID</span>: <span class="ident">ObjectID</span><span class="op">&gt;</span> <span class="ident">Object</span><span class="op">&lt;</span><span class="ident">ID</span><span class="op">&gt;</span> {
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">id</span>: <span class="ident">ID</span>, <span class="ident">color</span>: <span class="ident">Color</span>, <span class="ident">poly</span>: <span class="ident">Polygon</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Object</span><span class="op">&lt;</span><span class="ident">ID</span><span class="op">&gt;</span> {
        <span class="ident">Object</span> {
            <span class="ident">id</span>,
            <span class="ident">geometry</span>: <span class="macro">vec</span><span class="macro">!</span>[(<span class="ident">color</span>, <span class="ident">poly</span>)],
        }
    }
}

<span class="kw">struct</span> <span class="ident">WorldObject</span> {
    <span class="ident">unioned_polygon</span>: <span class="ident">Polygon</span>,
    <span class="ident">draw</span>: <span class="ident">Drawable</span>,
    <span class="ident">quadtree_id</span>: <span class="ident">ItemId</span>,
}

<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">World</span><span class="op">&lt;</span><span class="ident">ID</span>: <span class="ident">ObjectID</span><span class="op">&gt;</span> {
    <span class="ident">objects</span>: <span class="ident">HashMap</span><span class="op">&lt;</span><span class="ident">ID</span>, <span class="ident">WorldObject</span><span class="op">&gt;</span>,
    <span class="ident">quadtree</span>: <span class="ident">QuadTree</span><span class="op">&lt;</span><span class="ident">ID</span><span class="op">&gt;</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="kw">impl</span><span class="op">&lt;</span><span class="ident">ID</span>: <span class="ident">ObjectID</span><span class="op">&gt;</span> <span class="ident">World</span><span class="op">&lt;</span><span class="ident">ID</span><span class="op">&gt;</span> {
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>() <span class="op">-</span><span class="op">&gt;</span> <span class="ident">World</span><span class="op">&lt;</span><span class="ident">ID</span><span class="op">&gt;</span> {
        <span class="ident">World</span> {
            <span class="ident">objects</span>: <span class="ident">HashMap</span>::<span class="ident">new</span>(),
            <span class="comment">// Force the quadtree to support any possible positions. Especially when creating</span>
            <span class="comment">// synthetic maps, the bounds change, but updating the quadtree is nontrivial. But they</span>
            <span class="comment">// have to be non-negative.</span>
            <span class="ident">quadtree</span>: <span class="ident">QuadTree</span>::<span class="ident">default</span>(
                <span class="ident">Bounds</span>::<span class="ident">from</span>(<span class="kw-2">&amp;</span><span class="macro">vec</span><span class="macro">!</span>[
                    <span class="ident">Pt2D</span>::<span class="ident">new</span>(<span class="number">0.0</span>, <span class="number">0.0</span>),
                    <span class="ident">Pt2D</span>::<span class="ident">new</span>(<span class="ident">std</span>::<span class="ident">f64</span>::<span class="ident">MAX</span>, <span class="ident">std</span>::<span class="ident">f64</span>::<span class="ident">MAX</span>),
                ])
                .<span class="ident">as_bbox</span>(),
            ),
            <span class="ident">current_selection</span>: <span class="prelude-val">None</span>,
        }
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">draw</span><span class="op">&lt;</span><span class="ident">F</span>: <span class="ident">Fn</span>(<span class="ident">ID</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">bool</span><span class="op">&gt;</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">show</span>: <span class="ident">F</span>) {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">objects</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">ID</span><span class="op">&gt;</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
        <span class="kw">for</span> <span class="kw-2">&amp;</span>(<span class="ident">id</span>, <span class="kw">_</span>, <span class="kw">_</span>) <span class="kw">in</span> <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">quadtree</span>.<span class="ident">query</span>(<span class="ident">g</span>.<span class="ident">get_screen_bounds</span>().<span class="ident">as_bbox</span>()) {
            <span class="kw">if</span> <span class="ident">show</span>(<span class="kw-2">*</span><span class="ident">id</span>) {
                <span class="ident">objects</span>.<span class="ident">push</span>(<span class="kw-2">*</span><span class="ident">id</span>);
            }
        }
        <span class="ident">objects</span>.<span class="ident">sort_by_key</span>(<span class="op">|</span><span class="ident">id</span><span class="op">|</span> <span class="ident">id</span>.<span class="ident">zorder</span>());

        <span class="kw">for</span> <span class="ident">id</span> <span class="kw">in</span> <span class="ident">objects</span> {
            <span class="kw">let</span> <span class="ident">obj</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">objects</span>[<span class="kw-2">&amp;</span><span class="ident">id</span>];
            <span class="ident">g</span>.<span class="ident">redraw</span>(<span class="kw-2">&amp;</span><span class="ident">obj</span>.<span class="ident">draw</span>);
        }

        <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">id</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">current_selection</span> {
            <span class="kw">let</span> <span class="ident">obj</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">objects</span>[<span class="kw-2">&amp;</span><span class="ident">id</span>];
            <span class="ident">g</span>.<span class="ident">draw_polygon</span>(<span class="ident">Color</span>::<span class="ident">CYAN</span>.<span class="ident">alpha</span>(<span class="number">0.5</span>), <span class="ident">obj</span>.<span class="ident">unioned_polygon</span>.<span class="ident">clone</span>());
        }
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">handle_mouseover</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="prelude-val">None</span>;

        <span class="kw">let</span> <span class="ident">cursor</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="op">=</span> <span class="ident">ctx</span>.<span class="ident">canvas</span>.<span class="ident">get_cursor_in_map_space</span>() {
            <span class="ident">pt</span>
        } <span class="kw">else</span> {
            <span class="kw">return</span>;
        };

        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">objects</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">ID</span><span class="op">&gt;</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
        <span class="kw">for</span> <span class="kw-2">&amp;</span>(<span class="ident">id</span>, <span class="kw">_</span>, <span class="kw">_</span>) <span class="kw">in</span> <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">quadtree</span>.<span class="ident">query</span>(
            <span class="ident">Circle</span>::<span class="ident">new</span>(<span class="ident">cursor</span>, <span class="ident">Distance</span>::<span class="ident">meters</span>(<span class="number">3.0</span>))
                .<span class="ident">get_bounds</span>()
                .<span class="ident">as_bbox</span>(),
        ) {
            <span class="ident">objects</span>.<span class="ident">push</span>(<span class="kw-2">*</span><span class="ident">id</span>);
        }
        <span class="ident">objects</span>.<span class="ident">sort_by_key</span>(<span class="op">|</span><span class="ident">id</span><span class="op">|</span> <span class="ident">id</span>.<span class="ident">zorder</span>());
        <span class="ident">objects</span>.<span class="ident">reverse</span>();

        <span class="kw">for</span> <span class="ident">id</span> <span class="kw">in</span> <span class="ident">objects</span> {
            <span class="kw">if</span> <span class="self">self</span>.<span class="ident">objects</span>[<span class="kw-2">&amp;</span><span class="ident">id</span>].<span class="ident">unioned_polygon</span>.<span class="ident">contains_pt</span>(<span class="ident">cursor</span>) {
                <span class="self">self</span>.<span class="ident">current_selection</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">id</span>);
                <span class="kw">return</span>;
            }
        }
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">force_set_selection</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">id</span>: <span class="ident">ID</span>) {
        <span class="self">self</span>.<span class="ident">current_selection</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">id</span>);
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_selection</span>(<span class="kw-2">&amp;</span><span class="self">self</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">current_selection</span>
    }

    <span class="comment">// TODO This and delete assume the original bounds passed to the quadtree are still valid.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">add</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">obj</span>: <span class="ident">Object</span><span class="op">&lt;</span><span class="ident">ID</span><span class="op">&gt;</span>) {
        <span class="kw">let</span> <span class="ident">unioned_polygon</span> <span class="op">=</span>
            <span class="ident">Polygon</span>::<span class="ident">union_all</span>(<span class="ident">obj</span>.<span class="ident">geometry</span>.<span class="ident">iter</span>().<span class="ident">map</span>(<span class="op">|</span>(<span class="kw">_</span>, <span class="ident">p</span>)<span class="op">|</span> <span class="ident">p</span>.<span class="ident">clone</span>()).<span class="ident">collect</span>());

        <span class="kw">let</span> <span class="ident">bounds</span> <span class="op">=</span> <span class="ident">unioned_polygon</span>.<span class="ident">get_bounds</span>();
        <span class="comment">// This might break, it might not; the quadtree impl is a little unclear.</span>
        <span class="kw">if</span> <span class="ident">bounds</span>.<span class="ident">min_x</span> <span class="op">&lt;</span> <span class="number">0.0</span> <span class="op">|</span><span class="op">|</span> <span class="ident">bounds</span>.<span class="ident">min_y</span> <span class="op">&lt;</span> <span class="number">0.0</span> {
            <span class="macro">warn</span><span class="macro">!</span>(<span class="string">&quot;{:?} has negative coordinates {:?}&quot;</span>, <span class="ident">obj</span>.<span class="ident">id</span>, <span class="ident">bounds</span>);
        }
        <span class="kw">let</span> <span class="ident">quadtree_id</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">quadtree</span>.<span class="ident">insert_with_box</span>(<span class="ident">obj</span>.<span class="ident">id</span>, <span class="ident">bounds</span>.<span class="ident">as_bbox</span>());
        <span class="kw">let</span> <span class="ident">draw</span> <span class="op">=</span> <span class="ident">ctx</span>.<span class="ident">upload</span>(<span class="ident">GeomBatch</span>::<span class="ident">from</span>(<span class="ident">obj</span>.<span class="ident">geometry</span>));
        <span class="self">self</span>.<span class="ident">objects</span>.<span class="ident">insert</span>(
            <span class="ident">obj</span>.<span class="ident">id</span>,
            <span class="ident">WorldObject</span> {
                <span class="ident">unioned_polygon</span>,
                <span class="ident">draw</span>,
                <span class="ident">quadtree_id</span>,
            },
        );
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">delete</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">id</span>: <span class="ident">ID</span>) {
        <span class="kw">let</span> <span class="ident">obj</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">objects</span>.<span class="ident">remove</span>(<span class="kw-2">&amp;</span><span class="ident">id</span>).<span class="ident">unwrap</span>();
        <span class="self">self</span>.<span class="ident">quadtree</span>.<span class="ident">remove</span>(<span class="ident">obj</span>.<span class="ident">quadtree_id</span>).<span class="ident">unwrap</span>();
    }
}
</pre></div>
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