<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `map_model&#x2F;src&#x2F;objects&#x2F;turn.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>turn.rs - source</title><link rel="stylesheet" type="text/css" href="../../../normalize.css"><link rel="stylesheet" type="text/css" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../../light.css"  id="themeStyle"><link rel="stylesheet" type="text/css" href="../../../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../../../ayu.css" disabled ><script id="default-settings" ></script><script src="../../../storage.js"></script><script src="../../../crates.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../../favicon.svg"><style type="text/css">#crate-search{background-image:url("../../../down-arrow.svg");}</style></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu" role="button">&#9776;</div><a href='../../../map_model/index.html'><div class='logo-container rust-logo'><img src='../../../rust-logo.png' alt='logo'></div></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu" title="themes"><img width="18" height="18" alt="Pick another theme!" src="../../../brush.svg"></button><div id="theme-choices" role="menu"></div></div><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" disabled autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" id="help-button" title="help">?</button><a id="settings-menu" href="../../../settings.html" title="settings"><img width="18" height="18" alt="Change settings" src="../../../wheel.svg"></a></div></form></nav><section id="main" class="content"><div class="example-wrap"><pre class="line-numbers"><span id="1">  1</span>
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</pre><pre class="rust"><code><span class="kw">use</span> <span class="ident">std::fmt</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">geom</span>::{<span class="ident">Angle</span>, <span class="ident">PolyLine</span>};

<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::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">MovementID</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>) -&gt; <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="doccomment">/// A marked zebra crossing, where pedestrians usually have priority</span>
    <span class="ident">Crosswalk</span>,
    <span class="doccomment">/// The corner where two sidewalks meet. Pedestrians can cross this without conflicting with</span>
    <span class="doccomment">/// any vehicle traffic</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="doccomment">/// An unmarked crossing, where pedestrians may cross without priority over vehicles</span>
    <span class="comment">// TODO During the next map regeneration, sort this list to be next to crosswalk. I want to</span>
    <span class="comment">// avoid binary incompatibility in the meantime.</span>
    <span class="ident">UnmarkedCrossing</span>,
}

<span class="kw">impl</span> <span class="ident">TurnType</span> {
    <span class="doccomment">/// Is the turn a crosswalk or unmarked crossing?</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">pedestrian_crossing</span>(<span class="self">self</span>) -&gt; <span class="ident">bool</span> {
        <span class="self">self</span> <span class="op">==</span> <span class="ident">TurnType::Crosswalk</span> <span class="op">|</span><span class="op">|</span> <span class="self">self</span> <span class="op">==</span> <span class="ident">TurnType::UnmarkedCrossing</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="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>) -&gt; <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="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="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="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="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="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">// The relative angle of the turn, should be the angle from the src lane to the dst lane, but</span>
    <span class="comment">// instead uses the first and last lines of the turn geometry, which is currently not quite the</span>
    <span class="comment">// same angle as between the source and destination lanes</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>) -&gt; <span class="ident">Angle</span> {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">geom</span>.<span class="ident">points</span>().<span class="ident">len</span>() <span class="op">&lt;</span> <span class="number">3</span> {
            <span class="kw">return</span> <span class="ident">Angle::ZERO</span>;
        }

        <span class="self">self</span>.<span class="ident">geom</span>
            .<span class="ident">last_line</span>()
            .<span class="ident">angle</span>()
            .<span class="ident">shortest_rotation_towards</span>(<span class="self">self</span>.<span class="ident">geom</span>.<span class="ident">first_line</span>().<span class="ident">angle</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>) -&gt; <span class="ident">bool</span> {
        <span class="self">self</span>.<span class="ident">turn_type</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="ident">TurnType::Crosswalk</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="ident">TurnType::UnmarkedCrossing</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>) -&gt; (<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">id</span>.<span class="ident">road</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">t</span>.<span class="ident">id</span>.<span class="ident">dst</span>.<span class="ident">road</span> <span class="op">==</span> <span class="ident">to</span>.<span class="ident">id</span>.<span class="ident">road</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="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">id</span>.<span class="ident">road</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="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="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="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>) -&gt; <span class="ident">bool</span> {
        <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::osm::RoadRank</span>;
        <span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">turn_type</span>.<span class="ident">pedestrian_crossing</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="ident">RoadRank::Arterial</span> <span class="op">|</span><span class="op">|</span> <span class="ident">rank</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>) -&gt; <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>) -&gt; <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="self">self</span>.<span class="ident">id</span>.<span class="ident">dst</span>.<span class="ident">road</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> =&gt; {
                    <span class="kw">if</span> <span class="ident">dst</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> =&gt; {
                    <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">/// If this turn is a crosswalk over a single road, return that road and which end of the road</span>
    <span class="doccomment">/// is crossed.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">crosswalk_over_road</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>) -&gt; <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">DirectedRoadID</span><span class="op">&gt;</span> {
        <span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">turn_type</span>.<span class="ident">pedestrian_crossing</span>() {
            <span class="kw">return</span> <span class="prelude-val">None</span>;
        }
        <span class="comment">// We cross multiple roads</span>
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">id</span>.<span class="ident">src</span>.<span class="ident">road</span> <span class="op">!</span><span class="op">=</span> <span class="self">self</span>.<span class="ident">id</span>.<span class="ident">dst</span>.<span class="ident">road</span> {
            <span class="kw">return</span> <span class="prelude-val">None</span>;
        }
        <span class="prelude-val">Some</span>(<span class="ident">DirectedRoadID</span> {
            <span class="ident">road</span>: <span class="self">self</span>.<span class="ident">id</span>.<span class="ident">src</span>.<span class="ident">road</span>,
            <span class="ident">dir</span>: <span class="kw">if</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">src</span>.<span class="ident">road</span>).<span class="ident">dst_i</span> <span class="op">==</span> <span class="self">self</span>.<span class="ident">id</span>.<span class="ident">parent</span> {
                <span class="ident">Direction::Fwd</span>
            } <span class="kw">else</span> {
                <span class="ident">Direction::Back</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>) -&gt; <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>(),
        }
    }
}
</code></pre></div>
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