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                <a id="settings-menu" href="../../../settings.html"><img src="../../../wheel.svg" width="18" height="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><pre class="line-numbers"><span id="1">  1</span>
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</pre><div class="example-wrap"><pre class="rust ">
<span class="kw">use</span> <span class="ident">std::collections</span>::{<span class="ident">BTreeMap</span>, <span class="ident">BTreeSet</span>};
<span class="kw">use</span> <span class="ident">std::fmt</span>;

<span class="kw">use</span> <span class="ident">anyhow::Result</span>;
<span class="kw">use</span> <span class="ident">serde</span>::{<span class="ident">Deserialize</span>, <span class="ident">Serialize</span>};

<span class="kw">use</span> <span class="ident">abstutil::MultiMap</span>;
<span class="kw">use</span> <span class="ident">geom</span>::{<span class="ident">Angle</span>, <span class="ident">Distance</span>, <span class="ident">PolyLine</span>, <span class="ident">Pt2D</span>};

<span class="kw">use</span> <span class="kw">crate</span><span class="ident">::raw::RestrictionType</span>;
<span class="kw">use</span> <span class="kw">crate</span>::{
    <span class="ident">DirectedRoadID</span>, <span class="ident">Direction</span>, <span class="ident">Intersection</span>, <span class="ident">IntersectionID</span>, <span class="ident">LaneID</span>, <span class="ident">Map</span>, <span class="ident">PathConstraints</span>,
};

<span class="doccomment">/// Turns are uniquely identified by their (src, dst) lanes and their parent intersection.</span>
<span class="doccomment">/// Intersection is needed to distinguish crosswalks that exist at two ends of a sidewalk.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Copy</span>, <span class="ident">Debug</span>, <span class="ident">Eq</span>, <span class="ident">Hash</span>, <span class="ident">PartialEq</span>, <span class="ident">PartialOrd</span>, <span class="ident">Ord</span>, <span class="ident">Serialize</span>, <span class="ident">Deserialize</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">TurnID</span> {
    <span class="kw">pub</span> <span class="ident">parent</span>: <span class="ident">IntersectionID</span>,
    <span class="doccomment">/// src and dst must both belong to parent. No guarantees that src is incoming and dst is</span>
    <span class="doccomment">/// outgoing for turns between sidewalks.</span>
    <span class="kw">pub</span> <span class="ident">src</span>: <span class="ident">LaneID</span>,
    <span class="kw">pub</span> <span class="ident">dst</span>: <span class="ident">LaneID</span>,
}

<span class="kw">impl</span> <span class="ident">fmt::Display</span> <span class="kw">for</span> <span class="ident">TurnID</span> {
    <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">fmt::Formatter</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">fmt::Result</span> {
        <span class="macro">write!</span>(<span class="ident">f</span>, <span class="string">&quot;TurnID({}, {}, {})&quot;</span>, <span class="self">self</span>.<span class="ident">src</span>, <span class="self">self</span>.<span class="ident">dst</span>, <span class="self">self</span>.<span class="ident">parent</span>)
    }
}

<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Copy</span>, <span class="ident">Debug</span>, <span class="ident">Eq</span>, <span class="ident">PartialOrd</span>, <span class="ident">Ord</span>, <span class="ident">PartialEq</span>, <span class="ident">Serialize</span>, <span class="ident">Deserialize</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">TurnType</span> {
    <span class="ident">Crosswalk</span>,
    <span class="ident">SharedSidewalkCorner</span>,
    <span class="comment">// These are for vehicle turns</span>
    <span class="ident">Straight</span>,
    <span class="ident">Right</span>,
    <span class="ident">Left</span>,
    <span class="ident">UTurn</span>,
}

<span class="comment">// TODO This concept may be dated, now that Movements exist. Within a movement, the lane-changing</span>
<span class="comment">// turns should be treated as less important.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Serialize</span>, <span class="ident">Deserialize</span>, <span class="ident">Debug</span>, <span class="ident">PartialEq</span>, <span class="ident">Clone</span>, <span class="ident">Copy</span>, <span class="ident">PartialOrd</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">TurnPriority</span> {
    <span class="doccomment">/// For stop signs: Can&#39;t currently specify this!</span>
    <span class="doccomment">/// For traffic signals: Can&#39;t do this turn right now.</span>
    <span class="ident">Banned</span>,
    <span class="doccomment">/// For stop signs: cars have to stop before doing this turn, and are accepted with the lowest</span>
    <span class="doccomment">/// priority.</span>
    <span class="doccomment">/// For traffic signals: Cars can do this immediately if there are no previously accepted</span>
    <span class="doccomment">/// conflicting turns.</span>
    <span class="ident">Yield</span>,
    <span class="doccomment">/// For stop signs: cars can do this without stopping. These can conflict!</span>
    <span class="doccomment">/// For traffic signals: Must be non-conflicting.</span>
    <span class="ident">Protected</span>,
}

<span class="doccomment">/// A Turn leads from the end of one Lane to the start of another. (Except for pedestrians;</span>
<span class="doccomment">/// sidewalks are bidirectional.)</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Serialize</span>, <span class="ident">Deserialize</span>, <span class="ident">Debug</span>, <span class="ident">Clone</span>, <span class="ident">PartialEq</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Turn</span> {
    <span class="kw">pub</span> <span class="ident">id</span>: <span class="ident">TurnID</span>,
    <span class="kw">pub</span> <span class="ident">turn_type</span>: <span class="ident">TurnType</span>,
    <span class="comment">// TODO Some turns might not actually have geometry. Currently encoded by two equal points.</span>
    <span class="comment">// Represent more directly?</span>
    <span class="kw">pub</span> <span class="ident">geom</span>: <span class="ident">PolyLine</span>,
    <span class="doccomment">/// Empty except for TurnType::Crosswalk. Usually just one other ID, except for the case of 4</span>
    <span class="doccomment">/// duplicates at a degenerate intersection.</span>
    <span class="kw">pub</span> <span class="ident">other_crosswalk_ids</span>: <span class="ident">BTreeSet</span><span class="op">&lt;</span><span class="ident">TurnID</span><span class="op">&gt;</span>,
}

<span class="kw">impl</span> <span class="ident">Turn</span> {
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">conflicts_with</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&amp;</span><span class="ident">Turn</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">bool</span> {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">turn_type</span> <span class="op">=</span><span class="op">=</span> <span class="ident">TurnType::SharedSidewalkCorner</span>
            <span class="op">|</span><span class="op">|</span> <span class="ident">other</span>.<span class="ident">turn_type</span> <span class="op">=</span><span class="op">=</span> <span class="ident">TurnType::SharedSidewalkCorner</span>
        {
            <span class="kw">return</span> <span class="bool-val">false</span>;
        }
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">id</span> <span class="op">=</span><span class="op">=</span> <span class="ident">other</span>.<span class="ident">id</span> {
            <span class="kw">return</span> <span class="bool-val">false</span>;
        }
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">between_sidewalks</span>() <span class="op">&amp;&amp;</span> <span class="ident">other</span>.<span class="ident">between_sidewalks</span>() {
            <span class="kw">return</span> <span class="bool-val">false</span>;
        }

        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">geom</span>.<span class="ident">first_pt</span>() <span class="op">=</span><span class="op">=</span> <span class="ident">other</span>.<span class="ident">geom</span>.<span class="ident">first_pt</span>() {
            <span class="kw">return</span> <span class="bool-val">false</span>;
        }
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">geom</span>.<span class="ident">last_pt</span>() <span class="op">=</span><span class="op">=</span> <span class="ident">other</span>.<span class="ident">geom</span>.<span class="ident">last_pt</span>() {
            <span class="kw">return</span> <span class="bool-val">true</span>;
        }
        <span class="self">self</span>.<span class="ident">geom</span>.<span class="ident">intersection</span>(<span class="kw-2">&amp;</span><span class="ident">other</span>.<span class="ident">geom</span>).<span class="ident">is_some</span>()
    }

    <span class="comment">// TODO What should this be for zero-length turns? Probably src&#39;s pt1 to dst&#39;s pt2 or</span>
    <span class="comment">// something.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">angle</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Angle</span> {
        <span class="self">self</span>.<span class="ident">geom</span>.<span class="ident">first_pt</span>().<span class="ident">angle_to</span>(<span class="self">self</span>.<span class="ident">geom</span>.<span class="ident">last_pt</span>())
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">between_sidewalks</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">bool</span> {
        <span class="self">self</span>.<span class="ident">turn_type</span> <span class="op">=</span><span class="op">=</span> <span class="ident">TurnType::SharedSidewalkCorner</span> <span class="op">|</span><span class="op">|</span> <span class="self">self</span>.<span class="ident">turn_type</span> <span class="op">=</span><span class="op">=</span> <span class="ident">TurnType::Crosswalk</span>
    }

    <span class="comment">// TODO Maybe precompute this.</span>
    <span class="doccomment">/// Penalties for (lane types, lane-changing, slow lane). The penalty may depend on the vehicle</span>
    <span class="doccomment">/// performing the turn. Lower means preferable.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">penalty</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">constraints</span>: <span class="ident">PathConstraints</span>, <span class="ident">map</span>: <span class="kw-2">&amp;</span><span class="ident">Map</span>) <span class="op">-</span><span class="op">&gt;</span> (<span class="ident">usize</span>, <span class="ident">usize</span>, <span class="ident">usize</span>) {
        <span class="kw">let</span> <span class="ident">from</span> <span class="op">=</span> <span class="ident">map</span>.<span class="ident">get_l</span>(<span class="self">self</span>.<span class="ident">id</span>.<span class="ident">src</span>);
        <span class="kw">let</span> <span class="ident">to</span> <span class="op">=</span> <span class="ident">map</span>.<span class="ident">get_l</span>(<span class="self">self</span>.<span class="ident">id</span>.<span class="ident">dst</span>);

        <span class="comment">// Starting from the farthest from the center line (right in the US), where is this travel</span>
        <span class="comment">// lane? Filters by the lane type and ignores lanes that don&#39;t go to the target road.</span>
        <span class="kw">let</span> <span class="ident">from_idx</span> <span class="op">=</span> {
            <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">cnt</span> <span class="op">=</span> <span class="number">0</span>;
            <span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">map</span>.<span class="ident">get_r</span>(<span class="ident">from</span>.<span class="ident">parent</span>);
            <span class="kw">for</span> (<span class="ident">l</span>, <span class="ident">lt</span>) <span class="kw">in</span> <span class="ident">r</span>.<span class="ident">children</span>(<span class="ident">from</span>.<span class="ident">dir</span>).<span class="ident">iter</span>().<span class="ident">rev</span>() {
                <span class="kw">if</span> <span class="ident">from</span>.<span class="ident">lane_type</span> <span class="op">!</span><span class="op">=</span> <span class="kw-2">*</span><span class="ident">lt</span> {
                    <span class="kw">continue</span>;
                }
                <span class="kw">if</span> <span class="ident">map</span>
                    .<span class="ident">get_turns_from_lane</span>(<span class="kw-2">*</span><span class="ident">l</span>)
                    .<span class="ident">into_iter</span>()
                    .<span class="ident">any</span>(<span class="op">|</span><span class="ident">t</span><span class="op">|</span> <span class="ident">map</span>.<span class="ident">get_l</span>(<span class="ident">t</span>.<span class="ident">id</span>.<span class="ident">dst</span>).<span class="ident">parent</span> <span class="op">=</span><span class="op">=</span> <span class="ident">to</span>.<span class="ident">parent</span>)
                {
                    <span class="ident">cnt</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
                    <span class="kw">if</span> <span class="ident">from</span>.<span class="ident">id</span> <span class="op">=</span><span class="op">=</span> <span class="kw-2">*</span><span class="ident">l</span> {
                        <span class="kw">break</span>;
                    }
                }
            }
            <span class="ident">cnt</span>
        };

        <span class="comment">// Starting from the farthest from the center line (right in the US), where is this travel</span>
        <span class="comment">// lane? Filters by the lane type.</span>
        <span class="kw">let</span> <span class="ident">to_idx</span> <span class="op">=</span> {
            <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">cnt</span> <span class="op">=</span> <span class="number">0</span>;
            <span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">map</span>.<span class="ident">get_r</span>(<span class="ident">to</span>.<span class="ident">parent</span>);
            <span class="kw">for</span> (<span class="ident">l</span>, <span class="ident">lt</span>) <span class="kw">in</span> <span class="ident">r</span>.<span class="ident">children</span>(<span class="ident">to</span>.<span class="ident">dir</span>).<span class="ident">iter</span>().<span class="ident">rev</span>() {
                <span class="kw">if</span> <span class="ident">to</span>.<span class="ident">lane_type</span> <span class="op">!</span><span class="op">=</span> <span class="kw-2">*</span><span class="ident">lt</span> {
                    <span class="kw">continue</span>;
                }
                <span class="ident">cnt</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
                <span class="kw">if</span> <span class="ident">to</span>.<span class="ident">id</span> <span class="op">=</span><span class="op">=</span> <span class="kw-2">*</span><span class="ident">l</span> {
                    <span class="kw">break</span>;
                }
            }
            <span class="ident">cnt</span>
        };

        <span class="comment">// TODO I thought about different cases where there are the same/more/less lanes going in</span>
        <span class="comment">// and out, but then actually, I think the reasonable thing in all cases is just to do</span>
        <span class="comment">// this.</span>
        <span class="kw">let</span> <span class="ident">lc_cost</span> <span class="op">=</span> ((<span class="ident">from_idx</span> <span class="kw">as</span> <span class="ident">isize</span>) <span class="op">-</span> (<span class="ident">to_idx</span> <span class="kw">as</span> <span class="ident">isize</span>)).<span class="ident">abs</span>() <span class="kw">as</span> <span class="ident">usize</span>;

        <span class="comment">// If we&#39;re a bike, prefer bike lanes, then bus lanes. If we&#39;re a bus, prefer bus lanes.</span>
        <span class="comment">// Otherwise, avoid special lanes, even if we&#39;re allowed to use them sometimes because they</span>
        <span class="comment">// happen to double as turn lanes.</span>
        <span class="kw">let</span> <span class="ident">lt_cost</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">constraints</span> <span class="op">=</span><span class="op">=</span> <span class="ident">PathConstraints::Bike</span> {
            <span class="kw">if</span> <span class="ident">to</span>.<span class="ident">is_biking</span>() {
                <span class="number">0</span>
            } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">to</span>.<span class="ident">is_bus</span>() {
                <span class="number">1</span>
            } <span class="kw">else</span> {
                <span class="number">2</span>
            }
        } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">constraints</span> <span class="op">=</span><span class="op">=</span> <span class="ident">PathConstraints::Bus</span> {
            <span class="kw">if</span> <span class="ident">to</span>.<span class="ident">is_bus</span>() {
                <span class="number">0</span>
            } <span class="kw">else</span> {
                <span class="number">1</span>
            }
        } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">to</span>.<span class="ident">is_bus</span>() {
            <span class="comment">// Cars should stay out of bus lanes unless it&#39;s required to make a turn</span>
            <span class="number">3</span>
        } <span class="kw">else</span> {
            <span class="number">0</span>
        };

        <span class="comment">// Keep right (in the US)</span>
        <span class="kw">let</span> <span class="ident">slow_lane</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">to_idx</span> <span class="op">&gt;</span> <span class="number">1</span> { <span class="number">1</span> } <span class="kw">else</span> { <span class="number">0</span> };

        (<span class="ident">lt_cost</span>, <span class="ident">lc_cost</span>, <span class="ident">slow_lane</span>)
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_crossing_arterial_intersection</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="ident">Map</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">bool</span> {
        <span class="kw">use</span> <span class="kw">crate</span><span class="ident">::osm::RoadRank</span>;
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">turn_type</span> <span class="op">!</span><span class="op">=</span> <span class="ident">TurnType::Crosswalk</span> {
            <span class="kw">return</span> <span class="bool-val">false</span>;
        }
        <span class="comment">// Distance-only metric has many false positives and negatives</span>
        <span class="comment">// return turn.geom.length() &gt; Distance::feet(41.0);</span>

        <span class="kw">let</span> <span class="ident">intersection</span> <span class="op">=</span> <span class="ident">map</span>.<span class="ident">get_i</span>(<span class="self">self</span>.<span class="ident">id</span>.<span class="ident">parent</span>);
        <span class="ident">intersection</span>.<span class="ident">roads</span>.<span class="ident">iter</span>().<span class="ident">any</span>(<span class="op">|</span><span class="ident">r</span><span class="op">|</span> {
            <span class="kw">let</span> <span class="ident">rank</span> <span class="op">=</span> <span class="ident">map</span>.<span class="ident">get_r</span>(<span class="kw-2">*</span><span class="ident">r</span>).<span class="ident">get_rank</span>();
            <span class="ident">rank</span> <span class="op">=</span><span class="op">=</span> <span class="ident">RoadRank::Arterial</span> <span class="op">|</span><span class="op">|</span> <span class="ident">rank</span> <span class="op">=</span><span class="op">=</span> <span class="ident">RoadRank::Highway</span>
        })
    }

    <span class="doccomment">/// Is this turn legal, according to turn lane tagging?</span>
    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">permitted_by_lane</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="ident">Map</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">bool</span> {
        <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">types</span>) <span class="op">=</span> <span class="ident">map</span>
            .<span class="ident">get_l</span>(<span class="self">self</span>.<span class="ident">id</span>.<span class="ident">src</span>)
            .<span class="ident">get_lane_level_turn_restrictions</span>(<span class="ident">map</span>.<span class="ident">get_parent</span>(<span class="self">self</span>.<span class="ident">id</span>.<span class="ident">src</span>), <span class="bool-val">false</span>)
        {
            <span class="ident">types</span>.<span class="ident">contains</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">turn_type</span>)
        } <span class="kw">else</span> {
            <span class="bool-val">true</span>
        }
    }

    <span class="doccomment">/// Is this turn legal, according to turn restrictions defined between road segments?</span>
    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">permitted_by_road</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">i</span>: <span class="kw-2">&amp;</span><span class="ident">Intersection</span>, <span class="ident">map</span>: <span class="kw-2">&amp;</span><span class="ident">Map</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">bool</span> {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">between_sidewalks</span>() {
            <span class="kw">return</span> <span class="bool-val">true</span>;
        }

        <span class="kw">let</span> <span class="ident">src</span> <span class="op">=</span> <span class="ident">map</span>.<span class="ident">get_parent</span>(<span class="self">self</span>.<span class="ident">id</span>.<span class="ident">src</span>);
        <span class="kw">let</span> <span class="ident">dst</span> <span class="op">=</span> <span class="ident">map</span>.<span class="ident">get_l</span>(<span class="self">self</span>.<span class="ident">id</span>.<span class="ident">dst</span>).<span class="ident">parent</span>;

        <span class="kw">for</span> (<span class="ident">restriction</span>, <span class="ident">to</span>) <span class="kw">in</span> <span class="kw-2">&amp;</span><span class="ident">src</span>.<span class="ident">turn_restrictions</span> {
            <span class="comment">// The restriction only applies to one direction of the road.</span>
            <span class="kw">if</span> <span class="op">!</span><span class="ident">i</span>.<span class="ident">roads</span>.<span class="ident">contains</span>(<span class="ident">to</span>) {
                <span class="kw">continue</span>;
            }
            <span class="kw">match</span> <span class="ident">restriction</span> {
                <span class="ident">RestrictionType::BanTurns</span> <span class="op">=</span><span class="op">&gt;</span> {
                    <span class="kw">if</span> <span class="ident">dst</span> <span class="op">=</span><span class="op">=</span> <span class="kw-2">*</span><span class="ident">to</span> {
                        <span class="kw">return</span> <span class="bool-val">false</span>;
                    }
                }
                <span class="ident">RestrictionType::OnlyAllowTurns</span> <span class="op">=</span><span class="op">&gt;</span> {
                    <span class="kw">if</span> <span class="ident">dst</span> <span class="op">!</span><span class="op">=</span> <span class="kw-2">*</span><span class="ident">to</span> {
                        <span class="kw">return</span> <span class="bool-val">false</span>;
                    }
                }
            }
        }

        <span class="bool-val">true</span>
    }
}

<span class="doccomment">/// A movement is like a turn, but with less detail -- it identifies a movement from one directed</span>
<span class="doccomment">/// road to another.</span>
<span class="doccomment">/// One road usually has 4 crosswalks, each a singleton Movement. We need all of the information</span>
<span class="doccomment">/// here to keep each crosswalk separate.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Copy</span>, <span class="ident">Debug</span>, <span class="ident">Eq</span>, <span class="ident">Hash</span>, <span class="ident">PartialEq</span>, <span class="ident">PartialOrd</span>, <span class="ident">Ord</span>, <span class="ident">Serialize</span>, <span class="ident">Deserialize</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">MovementID</span> {
    <span class="kw">pub</span> <span class="ident">from</span>: <span class="ident">DirectedRoadID</span>,
    <span class="kw">pub</span> <span class="ident">to</span>: <span class="ident">DirectedRoadID</span>,
    <span class="kw">pub</span> <span class="ident">parent</span>: <span class="ident">IntersectionID</span>,
    <span class="kw">pub</span> <span class="ident">crosswalk</span>: <span class="ident">bool</span>,
}

<span class="kw">impl</span> <span class="ident">MovementID</span> {
    <span class="comment">// TODO Expensive! Should we natively store movements everywhere?</span>
    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">get</span>(<span class="self">self</span>, <span class="ident">map</span>: <span class="kw-2">&amp;</span><span class="ident">Map</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Movement</span><span class="op">&gt;</span> {
        <span class="prelude-val">Ok</span>(<span class="ident">Movement::for_i</span>(<span class="self">self</span>.<span class="ident">parent</span>, <span class="ident">map</span>)<span class="question-mark">?</span>.<span class="ident">remove</span>(<span class="kw-2">&amp;</span><span class="self">self</span>).<span class="ident">unwrap</span>())
    }
}

<span class="doccomment">/// This is cheaper to store than a MovementID. It simply indexes into the list of movements.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Copy</span>, <span class="ident">Debug</span>, <span class="ident">Eq</span>, <span class="ident">Hash</span>, <span class="ident">PartialEq</span>, <span class="ident">PartialOrd</span>, <span class="ident">Ord</span>, <span class="ident">Serialize</span>, <span class="ident">Deserialize</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">CompressedMovementID</span> {
    <span class="kw">pub</span> <span class="ident">i</span>: <span class="ident">IntersectionID</span>,
    <span class="comment">// There better not be any intersection with more than 256 movements...</span>
    <span class="kw">pub</span> <span class="ident">idx</span>: <span class="ident">u8</span>,
}

<span class="doccomment">/// A Movement groups all turns from one road to another, letting traffic signals operate at a</span>
<span class="doccomment">/// higher level of abstraction.</span>
<span class="doccomment">/// This is used for pathfinding and traffic signals currently; other places focus instead on turns.</span>
<span class="comment">// TODO Unclear how this plays with different lane types</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Serialize</span>, <span class="ident">Deserialize</span>, <span class="ident">Clone</span>, <span class="ident">PartialEq</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Movement</span> {
    <span class="kw">pub</span> <span class="ident">id</span>: <span class="ident">MovementID</span>,
    <span class="kw">pub</span> <span class="ident">turn_type</span>: <span class="ident">TurnType</span>,
    <span class="kw">pub</span> <span class="ident">members</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">TurnID</span><span class="op">&gt;</span>,
    <span class="doccomment">/// The &quot;overall&quot; path of movement, aka, an &quot;average&quot; of the turn geometry</span>
    <span class="kw">pub</span> <span class="ident">geom</span>: <span class="ident">PolyLine</span>,
    <span class="kw">pub</span> <span class="ident">angle</span>: <span class="ident">Angle</span>,
}

<span class="kw">impl</span> <span class="ident">Movement</span> {
    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">for_i</span>(<span class="ident">i</span>: <span class="ident">IntersectionID</span>, <span class="ident">map</span>: <span class="kw-2">&amp;</span><span class="ident">Map</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">BTreeMap</span><span class="op">&lt;</span><span class="ident">MovementID</span>, <span class="ident">Movement</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">results</span> <span class="op">=</span> <span class="ident">BTreeMap::new</span>();
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">movements</span>: <span class="ident">MultiMap</span><span class="op">&lt;</span>(<span class="ident">DirectedRoadID</span>, <span class="ident">DirectedRoadID</span>), <span class="ident">TurnID</span><span class="op">&gt;</span> <span class="op">=</span> <span class="ident">MultiMap::new</span>();
        <span class="kw">for</span> <span class="ident">turn</span> <span class="kw">in</span> <span class="ident">map</span>.<span class="ident">get_turns_in_intersection</span>(<span class="ident">i</span>) {
            <span class="kw">let</span> <span class="ident">from</span> <span class="op">=</span> <span class="ident">map</span>.<span class="ident">get_l</span>(<span class="ident">turn</span>.<span class="ident">id</span>.<span class="ident">src</span>).<span class="ident">get_directed_parent</span>();
            <span class="kw">let</span> <span class="ident">to</span> <span class="op">=</span> <span class="ident">map</span>.<span class="ident">get_l</span>(<span class="ident">turn</span>.<span class="ident">id</span>.<span class="ident">dst</span>).<span class="ident">get_directed_parent</span>();
            <span class="kw">match</span> <span class="ident">turn</span>.<span class="ident">turn_type</span> {
                <span class="ident">TurnType::SharedSidewalkCorner</span> <span class="op">=</span><span class="op">&gt;</span> {}
                <span class="ident">TurnType::Crosswalk</span> <span class="op">=</span><span class="op">&gt;</span> {
                    <span class="kw">let</span> <span class="ident">id</span> <span class="op">=</span> <span class="ident">MovementID</span> {
                        <span class="ident">from</span>,
                        <span class="ident">to</span>,
                        <span class="ident">parent</span>: <span class="ident">i</span>,
                        <span class="ident">crosswalk</span>: <span class="bool-val">true</span>,
                    };
                    <span class="ident">results</span>.<span class="ident">insert</span>(
                        <span class="ident">id</span>,
                        <span class="ident">Movement</span> {
                            <span class="ident">id</span>,
                            <span class="ident">turn_type</span>: <span class="ident">TurnType::Crosswalk</span>,
                            <span class="ident">members</span>: <span class="macro">vec!</span>[<span class="ident">turn</span>.<span class="ident">id</span>],
                            <span class="ident">geom</span>: <span class="ident">turn</span>.<span class="ident">geom</span>.<span class="ident">clone</span>(),
                            <span class="ident">angle</span>: <span class="ident">turn</span>.<span class="ident">angle</span>(),
                        },
                    );
                }
                <span class="kw">_</span> <span class="op">=</span><span class="op">&gt;</span> {
                    <span class="ident">movements</span>.<span class="ident">insert</span>((<span class="ident">from</span>, <span class="ident">to</span>), <span class="ident">turn</span>.<span class="ident">id</span>);
                }
            }
        }
        <span class="kw">for</span> ((<span class="ident">from</span>, <span class="ident">to</span>), <span class="ident">members</span>) <span class="kw">in</span> <span class="ident">movements</span>.<span class="ident">consume</span>() {
            <span class="kw">let</span> <span class="ident">geom</span> <span class="op">=</span> <span class="ident">movement_geom</span>(
                <span class="ident">members</span>.<span class="ident">iter</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">t</span><span class="op">|</span> <span class="kw-2">&amp;</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">geom</span>).<span class="ident">collect</span>(),
                <span class="ident">from</span>,
                <span class="ident">to</span>,
            )<span class="question-mark">?</span>;
            <span class="kw">let</span> <span class="ident">turn_types</span>: <span class="ident">BTreeSet</span><span class="op">&lt;</span><span class="ident">TurnType</span><span class="op">&gt;</span> <span class="op">=</span>
                <span class="ident">members</span>.<span class="ident">iter</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">t</span><span class="op">|</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="ident">collect</span>();
            <span class="kw">if</span> <span class="ident">turn_types</span>.<span class="ident">len</span>() <span class="op">&gt;</span> <span class="number">1</span> {
                <span class="macro">warn!</span>(
                    <span class="string">&quot;Movement between {} and {} has weird turn types! {:?}&quot;</span>,
                    <span class="ident">from</span>, <span class="ident">to</span>, <span class="ident">turn_types</span>
                );
            }
            <span class="kw">let</span> <span class="ident">members</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">TurnID</span><span class="op">&gt;</span> <span class="op">=</span> <span class="ident">members</span>.<span class="ident">into_iter</span>().<span class="ident">collect</span>();
            <span class="kw">let</span> <span class="ident">id</span> <span class="op">=</span> <span class="ident">MovementID</span> {
                <span class="ident">from</span>,
                <span class="ident">to</span>,
                <span class="ident">parent</span>: <span class="ident">i</span>,
                <span class="ident">crosswalk</span>: <span class="bool-val">false</span>,
            };
            <span class="ident">results</span>.<span class="ident">insert</span>(
                <span class="ident">id</span>,
                <span class="ident">Movement</span> {
                    <span class="ident">id</span>,
                    <span class="ident">turn_type</span>: <span class="kw-2">*</span><span class="ident">turn_types</span>.<span class="ident">iter</span>().<span class="ident">next</span>().<span class="ident">unwrap</span>(),
                    <span class="ident">angle</span>: <span class="ident">map</span>.<span class="ident">get_t</span>(<span class="ident">members</span>[<span class="number">0</span>]).<span class="ident">angle</span>(),
                    <span class="ident">members</span>,
                    <span class="ident">geom</span>,
                },
            );
        }
        <span class="kw">if</span> <span class="ident">results</span>.<span class="ident">is_empty</span>() {
            <span class="macro">bail!</span>(<span class="string">&quot;No Movements! Does the intersection have at least 2 roads?&quot;</span>);
        }
        <span class="prelude-val">Ok</span>(<span class="ident">results</span>)
    }

    <span class="doccomment">/// Polyline points FROM intersection</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">src_center_and_width</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="ident">Map</span>) <span class="op">-</span><span class="op">&gt;</span> (<span class="ident">PolyLine</span>, <span class="ident">Distance</span>) {
        <span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">map</span>.<span class="ident">get_r</span>(<span class="self">self</span>.<span class="ident">id</span>.<span class="ident">from</span>.<span class="ident">id</span>);

        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">leftmost</span> <span class="op">=</span> <span class="ident">Distance::meters</span>(<span class="number">99999.0</span>);
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rightmost</span> <span class="op">=</span> <span class="ident">Distance::ZERO</span>;
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">left</span> <span class="op">=</span> <span class="ident">Distance::ZERO</span>;

        <span class="kw">for</span> (<span class="ident">l</span>, <span class="kw">_</span>, <span class="kw">_</span>) <span class="kw">in</span> <span class="ident">r</span>.<span class="ident">lanes_ltr</span>() {
            <span class="kw">let</span> <span class="ident">right</span> <span class="op">=</span> <span class="ident">left</span> <span class="op">+</span> <span class="ident">map</span>.<span class="ident">get_l</span>(<span class="ident">l</span>).<span class="ident">width</span>;

            <span class="kw">if</span> <span class="self">self</span>.<span class="ident">members</span>.<span class="ident">iter</span>().<span class="ident">any</span>(<span class="op">|</span><span class="ident">t</span><span class="op">|</span> <span class="ident">t</span>.<span class="ident">src</span> <span class="op">=</span><span class="op">=</span> <span class="ident">l</span>) {
                <span class="ident">leftmost</span> <span class="op">=</span> <span class="ident">leftmost</span>.<span class="ident">min</span>(<span class="ident">left</span>);
                <span class="ident">rightmost</span> <span class="op">=</span> <span class="ident">rightmost</span>.<span class="ident">max</span>(<span class="ident">right</span>);
            }

            <span class="ident">left</span> <span class="op">=</span> <span class="ident">right</span>;
        }

        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">pl</span> <span class="op">=</span> <span class="ident">r</span>
            .<span class="ident">get_left_side</span>(<span class="ident">map</span>)
            .<span class="ident">must_shift_right</span>((<span class="ident">leftmost</span> <span class="op">+</span> <span class="ident">rightmost</span>) <span class="op">/</span> <span class="number">2.0</span>);
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">id</span>.<span class="ident">from</span>.<span class="ident">dir</span> <span class="op">=</span><span class="op">=</span> <span class="ident">Direction::Back</span> {
            <span class="ident">pl</span> <span class="op">=</span> <span class="ident">pl</span>.<span class="ident">reversed</span>();
        }
        <span class="comment">// Flip direction, so we point away from the intersection</span>
        <span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">id</span>.<span class="ident">crosswalk</span> <span class="op">|</span><span class="op">|</span> <span class="ident">map</span>.<span class="ident">get_l</span>(<span class="self">self</span>.<span class="ident">members</span>[<span class="number">0</span>].<span class="ident">src</span>).<span class="ident">src_i</span> <span class="op">!</span><span class="op">=</span> <span class="self">self</span>.<span class="ident">members</span>[<span class="number">0</span>].<span class="ident">parent</span> {
            <span class="ident">pl</span> <span class="op">=</span> <span class="ident">pl</span>.<span class="ident">reversed</span>()
        };
        (<span class="ident">pl</span>, <span class="ident">rightmost</span> <span class="op">-</span> <span class="ident">leftmost</span>)
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">conflicts_with</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&amp;</span><span class="ident">Movement</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">bool</span> {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">id</span> <span class="op">=</span><span class="op">=</span> <span class="ident">other</span>.<span class="ident">id</span> {
            <span class="kw">return</span> <span class="bool-val">false</span>;
        }
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">turn_type</span> <span class="op">=</span><span class="op">=</span> <span class="ident">TurnType::Crosswalk</span> <span class="op">&amp;&amp;</span> <span class="ident">other</span>.<span class="ident">turn_type</span> <span class="op">=</span><span class="op">=</span> <span class="ident">TurnType::Crosswalk</span> {
            <span class="kw">return</span> <span class="bool-val">false</span>;
        }

        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">id</span>.<span class="ident">from</span> <span class="op">=</span><span class="op">=</span> <span class="ident">other</span>.<span class="ident">id</span>.<span class="ident">from</span>
            <span class="op">&amp;&amp;</span> <span class="self">self</span>.<span class="ident">turn_type</span> <span class="op">!</span><span class="op">=</span> <span class="ident">TurnType::Crosswalk</span>
            <span class="op">&amp;&amp;</span> <span class="ident">other</span>.<span class="ident">turn_type</span> <span class="op">!</span><span class="op">=</span> <span class="ident">TurnType::Crosswalk</span>
        {
            <span class="kw">return</span> <span class="bool-val">false</span>;
        }
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">id</span>.<span class="ident">to</span> <span class="op">=</span><span class="op">=</span> <span class="ident">other</span>.<span class="ident">id</span>.<span class="ident">to</span>
            <span class="op">&amp;&amp;</span> <span class="self">self</span>.<span class="ident">turn_type</span> <span class="op">!</span><span class="op">=</span> <span class="ident">TurnType::Crosswalk</span>
            <span class="op">&amp;&amp;</span> <span class="ident">other</span>.<span class="ident">turn_type</span> <span class="op">!</span><span class="op">=</span> <span class="ident">TurnType::Crosswalk</span>
        {
            <span class="kw">return</span> <span class="bool-val">true</span>;
        }
        <span class="comment">// TODO If you hit a panic below, you&#39;ve probably got two separate roads overlapping.</span>
        <span class="comment">// Fix it in OSM. Examples: https://www.openstreetmap.org/changeset/87465499,</span>
        <span class="comment">// https://www.openstreetmap.org/changeset/85952811</span>
        <span class="comment">/*if self.geom == other.geom {
            println!(&quot;*********** {:?} and {:?} have the same geom&quot;, self.id, other.id);
            return true;
        }*/</span>
        <span class="self">self</span>.<span class="ident">geom</span>.<span class="ident">intersection</span>(<span class="kw-2">&amp;</span><span class="ident">other</span>.<span class="ident">geom</span>).<span class="ident">is_some</span>()
    }
}

<span class="kw">fn</span> <span class="ident">movement_geom</span>(
    <span class="ident">polylines</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">PolyLine</span><span class="op">&gt;</span>,
    <span class="ident">from</span>: <span class="ident">DirectedRoadID</span>,
    <span class="ident">to</span>: <span class="ident">DirectedRoadID</span>,
) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">PolyLine</span><span class="op">&gt;</span> {
    <span class="kw">let</span> <span class="ident">num_pts</span> <span class="op">=</span> <span class="ident">polylines</span>[<span class="number">0</span>].<span class="ident">points</span>().<span class="ident">len</span>();
    <span class="kw">for</span> <span class="ident">pl</span> <span class="kw">in</span> <span class="kw-2">&amp;</span><span class="ident">polylines</span> {
        <span class="kw">if</span> <span class="ident">num_pts</span> <span class="op">!</span><span class="op">=</span> <span class="ident">pl</span>.<span class="ident">points</span>().<span class="ident">len</span>() {
            <span class="comment">// Kiiiiinda spammy</span>
            <span class="kw">if</span> <span class="bool-val">false</span> {
                <span class="macro">warn!</span>(
                    <span class="string">&quot;Movement between {} and {} can&#39;t make nice geometry&quot;</span>,
                    <span class="ident">from</span>, <span class="ident">to</span>
                );
            }
            <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">polylines</span>[<span class="number">0</span>].<span class="ident">clone</span>());
        }
    }

    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">pts</span> <span class="op">=</span> <span class="ident">Vec::new</span>();
    <span class="kw">for</span> <span class="ident">idx</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">num_pts</span> {
        <span class="ident">pts</span>.<span class="ident">push</span>(<span class="ident">Pt2D::center</span>(
            <span class="kw-2">&amp;</span><span class="ident">polylines</span>
                .<span class="ident">iter</span>()
                .<span class="ident">map</span>(<span class="op">|</span><span class="ident">pl</span><span class="op">|</span> <span class="ident">pl</span>.<span class="ident">points</span>()[<span class="ident">idx</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">PolyLine::deduping_new</span>(<span class="ident">pts</span>)
}

<span class="kw">impl</span> <span class="ident">TurnID</span> {
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_movement</span>(<span class="self">self</span>, <span class="ident">map</span>: <span class="kw-2">&amp;</span><span class="ident">Map</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">MovementID</span> {
        <span class="ident">MovementID</span> {
            <span class="ident">from</span>: <span class="ident">map</span>.<span class="ident">get_l</span>(<span class="self">self</span>.<span class="ident">src</span>).<span class="ident">get_directed_parent</span>(),
            <span class="ident">to</span>: <span class="ident">map</span>.<span class="ident">get_l</span>(<span class="self">self</span>.<span class="ident">dst</span>).<span class="ident">get_directed_parent</span>(),
            <span class="ident">parent</span>: <span class="self">self</span>.<span class="ident">parent</span>,
            <span class="ident">crosswalk</span>: <span class="ident">map</span>.<span class="ident">get_l</span>(<span class="self">self</span>.<span class="ident">src</span>).<span class="ident">is_walkable</span>(),
        }
    }
}
</pre></div>
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