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</pre><div class="example-wrap"><pre class="rust ">
<span class="doccomment">//! This is a much more primitive way to randomly generate trips. activity_model.rs has something</span>
<span class="doccomment">//! more realistic.</span>

<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::<span class="ident">BTreeSet</span>;

<span class="kw">use</span> <span class="ident">rand</span>::<span class="ident">seq</span>::<span class="ident">SliceRandom</span>;
<span class="kw">use</span> <span class="ident">rand</span>::<span class="ident">Rng</span>;
<span class="kw">use</span> <span class="ident">rand_xorshift</span>::<span class="ident">XorShiftRng</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</span>::<span class="ident">Timer</span>;
<span class="kw">use</span> <span class="ident">geom</span>::{<span class="ident">Duration</span>, <span class="ident">Time</span>};
<span class="kw">use</span> <span class="ident">map_model</span>::{<span class="ident">BuildingID</span>, <span class="ident">DirectedRoadID</span>, <span class="ident">Map</span>, <span class="ident">PathConstraints</span>};

<span class="kw">use</span> <span class="kw">crate</span>::{
    <span class="ident">DrivingGoal</span>, <span class="ident">IndividTrip</span>, <span class="ident">PersonID</span>, <span class="ident">PersonSpec</span>, <span class="ident">Scenario</span>, <span class="ident">SidewalkSpot</span>, <span class="ident">SpawnTrip</span>, <span class="ident">TripPurpose</span>,
};

<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Serialize</span>, <span class="ident">Deserialize</span>, <span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">ScenarioGenerator</span> {
    <span class="kw">pub</span> <span class="ident">scenario_name</span>: <span class="ident">String</span>,

    <span class="kw">pub</span> <span class="ident">only_seed_buses</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">BTreeSet</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;&gt;</span>,
    <span class="kw">pub</span> <span class="ident">spawn_over_time</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">SpawnOverTime</span><span class="op">&gt;</span>,
    <span class="kw">pub</span> <span class="ident">border_spawn_over_time</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">BorderSpawnOverTime</span><span class="op">&gt;</span>,
}

<span class="comment">// SpawnOverTime and BorderSpawnOverTime should be kept separate. Agents in SpawnOverTime pick</span>
<span class="comment">// their mode (use a car, walk, bus) based on the situation. When spawning directly a border,</span>
<span class="comment">// agents have to start as a car or pedestrian already.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Serialize</span>, <span class="ident">Deserialize</span>, <span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">SpawnOverTime</span> {
    <span class="kw">pub</span> <span class="ident">num_agents</span>: <span class="ident">usize</span>,
    <span class="comment">// TODO use https://docs.rs/rand/0.5.5/rand/distributions/struct.Normal.html</span>
    <span class="kw">pub</span> <span class="ident">start_time</span>: <span class="ident">Time</span>,
    <span class="kw">pub</span> <span class="ident">stop_time</span>: <span class="ident">Time</span>,
    <span class="kw">pub</span> <span class="ident">goal</span>: <span class="ident">OriginDestination</span>,
    <span class="kw">pub</span> <span class="ident">percent_driving</span>: <span class="ident">f64</span>,
    <span class="kw">pub</span> <span class="ident">percent_biking</span>: <span class="ident">f64</span>,
    <span class="kw">pub</span> <span class="ident">percent_use_transit</span>: <span class="ident">f64</span>,
}

<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Serialize</span>, <span class="ident">Deserialize</span>, <span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">BorderSpawnOverTime</span> {
    <span class="kw">pub</span> <span class="ident">num_peds</span>: <span class="ident">usize</span>,
    <span class="kw">pub</span> <span class="ident">num_cars</span>: <span class="ident">usize</span>,
    <span class="kw">pub</span> <span class="ident">num_bikes</span>: <span class="ident">usize</span>,
    <span class="kw">pub</span> <span class="ident">percent_use_transit</span>: <span class="ident">f64</span>,
    <span class="comment">// TODO use https://docs.rs/rand/0.5.5/rand/distributions/struct.Normal.html</span>
    <span class="kw">pub</span> <span class="ident">start_time</span>: <span class="ident">Time</span>,
    <span class="kw">pub</span> <span class="ident">stop_time</span>: <span class="ident">Time</span>,
    <span class="kw">pub</span> <span class="ident">start_from_border</span>: <span class="ident">DirectedRoadID</span>,
    <span class="kw">pub</span> <span class="ident">goal</span>: <span class="ident">OriginDestination</span>,
}

<span class="kw">impl</span> <span class="ident">ScenarioGenerator</span> {
    <span class="comment">// TODO may need to fork the RNG a bit more</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">generate</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="ident">rng</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">XorShiftRng</span>, <span class="ident">timer</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Timer</span>) <span class="op">-&gt;</span> <span class="ident">Scenario</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">scenario</span> <span class="op">=</span> <span class="ident">Scenario</span>::<span class="ident">empty</span>(<span class="ident">map</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">scenario_name</span>);
        <span class="ident">scenario</span>.<span class="ident">only_seed_buses</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">only_seed_buses</span>.<span class="ident">clone</span>();

        <span class="ident">timer</span>.<span class="ident">start</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;Generating scenario {}&quot;</span>, <span class="self">self</span>.<span class="ident">scenario_name</span>));

        <span class="kw">for</span> <span class="ident">s</span> <span class="kw">in</span> <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">spawn_over_time</span> {
            <span class="ident">timer</span>.<span class="ident">start_iter</span>(<span class="string">&quot;SpawnOverTime each agent&quot;</span>, <span class="ident">s</span>.<span class="ident">num_agents</span>);
            <span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">s</span>.<span class="ident">num_agents</span> {
                <span class="ident">timer</span>.<span class="ident">next</span>();
                <span class="ident">s</span>.<span class="ident">spawn_agent</span>(<span class="ident">rng</span>, <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">scenario</span>, <span class="ident">map</span>, <span class="ident">timer</span>);
            }
        }

        <span class="ident">timer</span>.<span class="ident">start_iter</span>(<span class="string">&quot;BorderSpawnOverTime&quot;</span>, <span class="self">self</span>.<span class="ident">border_spawn_over_time</span>.<span class="ident">len</span>());
        <span class="kw">for</span> <span class="ident">s</span> <span class="kw">in</span> <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">border_spawn_over_time</span> {
            <span class="ident">timer</span>.<span class="ident">next</span>();
            <span class="ident">s</span>.<span class="ident">spawn_peds</span>(<span class="ident">rng</span>, <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">scenario</span>, <span class="ident">map</span>, <span class="ident">timer</span>);
            <span class="ident">s</span>.<span class="ident">spawn_vehicles</span>(
                <span class="ident">s</span>.<span class="ident">num_cars</span>,
                <span class="ident">PathConstraints</span>::<span class="ident">Car</span>,
                <span class="ident">rng</span>,
                <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">scenario</span>,
                <span class="ident">map</span>,
                <span class="ident">timer</span>,
            );
            <span class="ident">s</span>.<span class="ident">spawn_vehicles</span>(
                <span class="ident">s</span>.<span class="ident">num_bikes</span>,
                <span class="ident">PathConstraints</span>::<span class="ident">Bike</span>,
                <span class="ident">rng</span>,
                <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">scenario</span>,
                <span class="ident">map</span>,
                <span class="ident">timer</span>,
            );
        }

        <span class="ident">timer</span>.<span class="ident">stop</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;Generating scenario {}&quot;</span>, <span class="self">self</span>.<span class="ident">scenario_name</span>));
        <span class="ident">scenario</span>
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">small_run</span>(<span class="ident">map</span>: <span class="kw-2">&amp;</span><span class="ident">Map</span>) <span class="op">-&gt;</span> <span class="ident">ScenarioGenerator</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">ScenarioGenerator</span> {
            <span class="ident">scenario_name</span>: <span class="string">&quot;small_run&quot;</span>.<span class="ident">to_string</span>(),
            <span class="ident">only_seed_buses</span>: <span class="prelude-val">None</span>,
            <span class="ident">spawn_over_time</span>: <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">SpawnOverTime</span> {
                <span class="ident">num_agents</span>: <span class="number">100</span>,
                <span class="ident">start_time</span>: <span class="ident">Time</span>::<span class="ident">START_OF_DAY</span>,
                <span class="ident">stop_time</span>: <span class="ident">Time</span>::<span class="ident">START_OF_DAY</span> <span class="op">+</span> <span class="ident">Duration</span>::<span class="ident">seconds</span>(<span class="number">5.0</span>),
                <span class="ident">goal</span>: <span class="ident">OriginDestination</span>::<span class="ident">Anywhere</span>,
                <span class="ident">percent_driving</span>: <span class="number">0.5</span>,
                <span class="ident">percent_biking</span>: <span class="number">0.5</span>,
                <span class="ident">percent_use_transit</span>: <span class="number">0.5</span>,
            }],
            <span class="comment">// If there are no sidewalks/driving lanes at a border, scenario instantiation will</span>
            <span class="comment">// just warn and skip them.</span>
            <span class="ident">border_spawn_over_time</span>: <span class="ident">map</span>
                .<span class="ident">all_incoming_borders</span>()
                .<span class="ident">into_iter</span>()
                .<span class="ident">map</span>(<span class="op">|</span><span class="ident">i</span><span class="op">|</span> <span class="ident">BorderSpawnOverTime</span> {
                    <span class="ident">num_peds</span>: <span class="number">10</span>,
                    <span class="ident">num_cars</span>: <span class="number">10</span>,
                    <span class="ident">num_bikes</span>: <span class="number">10</span>,
                    <span class="ident">start_time</span>: <span class="ident">Time</span>::<span class="ident">START_OF_DAY</span>,
                    <span class="ident">stop_time</span>: <span class="ident">Time</span>::<span class="ident">START_OF_DAY</span> <span class="op">+</span> <span class="ident">Duration</span>::<span class="ident">seconds</span>(<span class="number">5.0</span>),
                    <span class="ident">start_from_border</span>: <span class="ident">i</span>.<span class="ident">some_outgoing_road</span>(<span class="ident">map</span>).<span class="ident">unwrap</span>(),
                    <span class="ident">goal</span>: <span class="ident">OriginDestination</span>::<span class="ident">Anywhere</span>,
                    <span class="ident">percent_use_transit</span>: <span class="number">0.5</span>,
                })
                .<span class="ident">collect</span>(),
        };
        <span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="ident">map</span>.<span class="ident">all_outgoing_borders</span>() {
            <span class="ident">s</span>.<span class="ident">spawn_over_time</span>.<span class="ident">push</span>(<span class="ident">SpawnOverTime</span> {
                <span class="ident">num_agents</span>: <span class="number">10</span>,
                <span class="ident">start_time</span>: <span class="ident">Time</span>::<span class="ident">START_OF_DAY</span>,
                <span class="ident">stop_time</span>: <span class="ident">Time</span>::<span class="ident">START_OF_DAY</span> <span class="op">+</span> <span class="ident">Duration</span>::<span class="ident">seconds</span>(<span class="number">5.0</span>),
                <span class="ident">goal</span>: <span class="ident">OriginDestination</span>::<span class="ident">EndOfRoad</span>(<span class="ident">i</span>.<span class="ident">some_incoming_road</span>(<span class="ident">map</span>).<span class="ident">unwrap</span>()),
                <span class="ident">percent_driving</span>: <span class="number">0.5</span>,
                <span class="ident">percent_biking</span>: <span class="number">0.5</span>,
                <span class="ident">percent_use_transit</span>: <span class="number">0.5</span>,
            });
        }
        <span class="ident">s</span>
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">empty</span>(<span class="ident">name</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-&gt;</span> <span class="ident">ScenarioGenerator</span> {
        <span class="ident">ScenarioGenerator</span> {
            <span class="ident">scenario_name</span>: <span class="ident">name</span>.<span class="ident">to_string</span>(),
            <span class="ident">only_seed_buses</span>: <span class="prelude-val">Some</span>(<span class="ident">BTreeSet</span>::<span class="ident">new</span>()),
            <span class="ident">spawn_over_time</span>: <span class="ident">Vec</span>::<span class="ident">new</span>(),
            <span class="ident">border_spawn_over_time</span>: <span class="ident">Vec</span>::<span class="ident">new</span>(),
        }
    }

    <span class="comment">// No border agents here, because making the count work is hard.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">scaled_run</span>(<span class="ident">num_agents</span>: <span class="ident">usize</span>) <span class="op">-&gt;</span> <span class="ident">ScenarioGenerator</span> {
        <span class="ident">ScenarioGenerator</span> {
            <span class="ident">scenario_name</span>: <span class="string">&quot;scaled_run&quot;</span>.<span class="ident">to_string</span>(),
            <span class="ident">only_seed_buses</span>: <span class="prelude-val">Some</span>(<span class="ident">BTreeSet</span>::<span class="ident">new</span>()),
            <span class="ident">spawn_over_time</span>: <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">SpawnOverTime</span> {
                <span class="ident">num_agents</span>: <span class="ident">num_agents</span>,
                <span class="ident">start_time</span>: <span class="ident">Time</span>::<span class="ident">START_OF_DAY</span>,
                <span class="ident">stop_time</span>: <span class="ident">Time</span>::<span class="ident">START_OF_DAY</span> <span class="op">+</span> <span class="ident">Duration</span>::<span class="ident">seconds</span>(<span class="number">5.0</span>),
                <span class="ident">goal</span>: <span class="ident">OriginDestination</span>::<span class="ident">Anywhere</span>,
                <span class="ident">percent_driving</span>: <span class="number">0.5</span>,
                <span class="ident">percent_biking</span>: <span class="number">0.5</span>,
                <span class="ident">percent_use_transit</span>: <span class="number">0.5</span>,
            }],
            <span class="ident">border_spawn_over_time</span>: <span class="ident">Vec</span>::<span class="ident">new</span>(),
        }
    }
}

<span class="kw">impl</span> <span class="ident">SpawnOverTime</span> {
    <span class="kw">fn</span> <span class="ident">spawn_agent</span>(
        <span class="kw-2">&amp;</span><span class="self">self</span>,
        <span class="ident">rng</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">XorShiftRng</span>,
        <span class="ident">scenario</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Scenario</span>,
        <span class="ident">map</span>: <span class="kw-2">&amp;</span><span class="ident">Map</span>,
        <span class="ident">timer</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Timer</span>,
    ) {
        <span class="kw">let</span> <span class="ident">depart</span> <span class="op">=</span> <span class="ident">rand_time</span>(<span class="ident">rng</span>, <span class="self">self</span>.<span class="ident">start_time</span>, <span class="self">self</span>.<span class="ident">stop_time</span>);
        <span class="comment">// Note that it&#39;s fine for agents to start/end at the same building. Later we might</span>
        <span class="comment">// want a better assignment of people per household, or workers per office building.</span>
        <span class="kw">let</span> <span class="ident">from_bldg</span> <span class="op">=</span> <span class="ident">map</span>.<span class="ident">all_buildings</span>().<span class="ident">choose</span>(<span class="ident">rng</span>).<span class="ident">unwrap</span>().<span class="ident">id</span>;
        <span class="kw">let</span> <span class="ident">id</span> <span class="op">=</span> <span class="ident">PersonID</span>(<span class="ident">scenario</span>.<span class="ident">people</span>.<span class="ident">len</span>());

        <span class="kw">if</span> <span class="ident">rng</span>.<span class="ident">gen_bool</span>(<span class="self">self</span>.<span class="ident">percent_driving</span>) {
            <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">goal</span>) <span class="op">=</span> <span class="self">self</span>
                .<span class="ident">goal</span>
                .<span class="ident">pick_driving_goal</span>(<span class="ident">PathConstraints</span>::<span class="ident">Car</span>, <span class="ident">map</span>, <span class="ident">rng</span>, <span class="ident">timer</span>)
            {
                <span class="ident">scenario</span>.<span class="ident">people</span>.<span class="ident">push</span>(<span class="ident">PersonSpec</span> {
                    <span class="ident">id</span>,
                    <span class="ident">orig_id</span>: <span class="prelude-val">None</span>,
                    <span class="ident">trips</span>: <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">IndividTrip</span>::<span class="ident">new</span>(
                        <span class="ident">depart</span>,
                        <span class="ident">TripPurpose</span>::<span class="ident">Shopping</span>,
                        <span class="ident">SpawnTrip</span>::<span class="ident">UsingParkedCar</span>(<span class="ident">from_bldg</span>, <span class="ident">goal</span>),
                    )],
                });
                <span class="kw">return</span>;
            }
        }

        <span class="kw">if</span> <span class="ident">rng</span>.<span class="ident">gen_bool</span>(<span class="self">self</span>.<span class="ident">percent_biking</span>) {
            <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">goal</span>) <span class="op">=</span> <span class="self">self</span>
                .<span class="ident">goal</span>
                .<span class="ident">pick_driving_goal</span>(<span class="ident">PathConstraints</span>::<span class="ident">Bike</span>, <span class="ident">map</span>, <span class="ident">rng</span>, <span class="ident">timer</span>)
            {
                <span class="ident">scenario</span>.<span class="ident">people</span>.<span class="ident">push</span>(<span class="ident">PersonSpec</span> {
                    <span class="ident">id</span>,
                    <span class="ident">orig_id</span>: <span class="prelude-val">None</span>,
                    <span class="ident">trips</span>: <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">IndividTrip</span>::<span class="ident">new</span>(
                        <span class="ident">depart</span>,
                        <span class="ident">TripPurpose</span>::<span class="ident">Shopping</span>,
                        <span class="ident">SpawnTrip</span>::<span class="ident">UsingBike</span>(<span class="ident">from_bldg</span>, <span class="ident">goal</span>),
                    )],
                });
                <span class="kw">return</span>;
            }
        }

        <span class="kw">let</span> <span class="ident">start_spot</span> <span class="op">=</span> <span class="ident">SidewalkSpot</span>::<span class="ident">building</span>(<span class="ident">from_bldg</span>, <span class="ident">map</span>);
        <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">goal</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">goal</span>.<span class="ident">pick_walking_goal</span>(<span class="ident">map</span>, <span class="ident">rng</span>, <span class="ident">timer</span>) {
            <span class="kw">if</span> <span class="ident">start_spot</span> <span class="op">==</span> <span class="ident">goal</span> {
                <span class="ident">timer</span>.<span class="ident">warn</span>(<span class="string">&quot;Skipping walking trip between same two buildings&quot;</span>.<span class="ident">to_string</span>());
                <span class="kw">return</span>;
            }

            <span class="kw">if</span> <span class="ident">rng</span>.<span class="ident">gen_bool</span>(<span class="self">self</span>.<span class="ident">percent_use_transit</span>) {
                <span class="comment">// TODO This throws away some work. It also sequentially does expensive</span>
                <span class="comment">// work right here.</span>
                <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>((<span class="ident">stop1</span>, <span class="ident">maybe_stop2</span>, <span class="ident">route</span>)) <span class="op">=</span>
                    <span class="ident">map</span>.<span class="ident">should_use_transit</span>(<span class="ident">start_spot</span>.<span class="ident">sidewalk_pos</span>, <span class="ident">goal</span>.<span class="ident">sidewalk_pos</span>)
                {
                    <span class="ident">scenario</span>.<span class="ident">people</span>.<span class="ident">push</span>(<span class="ident">PersonSpec</span> {
                        <span class="ident">id</span>,
                        <span class="ident">orig_id</span>: <span class="prelude-val">None</span>,
                        <span class="ident">trips</span>: <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">IndividTrip</span>::<span class="ident">new</span>(
                            <span class="ident">depart</span>,
                            <span class="ident">TripPurpose</span>::<span class="ident">Shopping</span>,
                            <span class="ident">SpawnTrip</span>::<span class="ident">UsingTransit</span>(<span class="ident">start_spot</span>, <span class="ident">goal</span>, <span class="ident">route</span>, <span class="ident">stop1</span>, <span class="ident">maybe_stop2</span>),
                        )],
                    });
                    <span class="kw">return</span>;
                }
            }

            <span class="ident">scenario</span>.<span class="ident">people</span>.<span class="ident">push</span>(<span class="ident">PersonSpec</span> {
                <span class="ident">id</span>,
                <span class="ident">orig_id</span>: <span class="prelude-val">None</span>,
                <span class="ident">trips</span>: <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">IndividTrip</span>::<span class="ident">new</span>(
                    <span class="ident">depart</span>,
                    <span class="ident">TripPurpose</span>::<span class="ident">Shopping</span>,
                    <span class="ident">SpawnTrip</span>::<span class="ident">JustWalking</span>(<span class="ident">start_spot</span>, <span class="ident">goal</span>),
                )],
            });
            <span class="kw">return</span>;
        }

        <span class="ident">timer</span>.<span class="ident">warn</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;Couldn&#39;t fulfill {:?} at all&quot;</span>, <span class="self">self</span>));
    }
}

<span class="kw">impl</span> <span class="ident">BorderSpawnOverTime</span> {
    <span class="kw">fn</span> <span class="ident">spawn_peds</span>(
        <span class="kw-2">&amp;</span><span class="self">self</span>,
        <span class="ident">rng</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">XorShiftRng</span>,
        <span class="ident">scenario</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Scenario</span>,
        <span class="ident">map</span>: <span class="kw-2">&amp;</span><span class="ident">Map</span>,
        <span class="ident">timer</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Timer</span>,
    ) {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">num_peds</span> <span class="op">==</span> <span class="number">0</span> {
            <span class="kw">return</span>;
        }

        <span class="kw">let</span> <span class="ident">start</span> <span class="op">=</span> <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">s</span>) <span class="op">=</span>
            <span class="ident">SidewalkSpot</span>::<span class="ident">start_at_border</span>(<span class="self">self</span>.<span class="ident">start_from_border</span>.<span class="ident">src_i</span>(<span class="ident">map</span>), <span class="ident">map</span>)
        {
            <span class="ident">s</span>
        } <span class="kw">else</span> {
            <span class="ident">timer</span>.<span class="ident">warn</span>(<span class="macro">format</span><span class="macro">!</span>(
                <span class="string">&quot;Can&#39;t start_at_border for {} without sidewalk&quot;</span>,
                <span class="self">self</span>.<span class="ident">start_from_border</span>
            ));
            <span class="kw">return</span>;
        };

        <span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="self">self</span>.<span class="ident">num_peds</span> {
            <span class="kw">let</span> <span class="ident">depart</span> <span class="op">=</span> <span class="ident">rand_time</span>(<span class="ident">rng</span>, <span class="self">self</span>.<span class="ident">start_time</span>, <span class="self">self</span>.<span class="ident">stop_time</span>);
            <span class="kw">let</span> <span class="ident">id</span> <span class="op">=</span> <span class="ident">PersonID</span>(<span class="ident">scenario</span>.<span class="ident">people</span>.<span class="ident">len</span>());
            <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">goal</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">goal</span>.<span class="ident">pick_walking_goal</span>(<span class="ident">map</span>, <span class="ident">rng</span>, <span class="ident">timer</span>) {
                <span class="kw">if</span> <span class="ident">rng</span>.<span class="ident">gen_bool</span>(<span class="self">self</span>.<span class="ident">percent_use_transit</span>) {
                    <span class="comment">// TODO This throws away some work. It also sequentially does expensive</span>
                    <span class="comment">// work right here.</span>
                    <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>((<span class="ident">stop1</span>, <span class="ident">maybe_stop2</span>, <span class="ident">route</span>)) <span class="op">=</span>
                        <span class="ident">map</span>.<span class="ident">should_use_transit</span>(<span class="ident">start</span>.<span class="ident">sidewalk_pos</span>, <span class="ident">goal</span>.<span class="ident">sidewalk_pos</span>)
                    {
                        <span class="ident">scenario</span>.<span class="ident">people</span>.<span class="ident">push</span>(<span class="ident">PersonSpec</span> {
                            <span class="ident">id</span>,
                            <span class="ident">orig_id</span>: <span class="prelude-val">None</span>,
                            <span class="ident">trips</span>: <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">IndividTrip</span>::<span class="ident">new</span>(
                                <span class="ident">depart</span>,
                                <span class="ident">TripPurpose</span>::<span class="ident">Shopping</span>,
                                <span class="ident">SpawnTrip</span>::<span class="ident">UsingTransit</span>(
                                    <span class="ident">start</span>.<span class="ident">clone</span>(),
                                    <span class="ident">goal</span>,
                                    <span class="ident">route</span>,
                                    <span class="ident">stop1</span>,
                                    <span class="ident">maybe_stop2</span>,
                                ),
                            )],
                        });
                        <span class="kw">continue</span>;
                    }
                }

                <span class="ident">scenario</span>.<span class="ident">people</span>.<span class="ident">push</span>(<span class="ident">PersonSpec</span> {
                    <span class="ident">id</span>,
                    <span class="ident">orig_id</span>: <span class="prelude-val">None</span>,
                    <span class="ident">trips</span>: <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">IndividTrip</span>::<span class="ident">new</span>(
                        <span class="ident">depart</span>,
                        <span class="ident">TripPurpose</span>::<span class="ident">Shopping</span>,
                        <span class="ident">SpawnTrip</span>::<span class="ident">JustWalking</span>(<span class="ident">start</span>.<span class="ident">clone</span>(), <span class="ident">goal</span>),
                    )],
                });
            }
        }
    }

    <span class="kw">fn</span> <span class="ident">spawn_vehicles</span>(
        <span class="kw-2">&amp;</span><span class="self">self</span>,
        <span class="ident">num</span>: <span class="ident">usize</span>,
        <span class="ident">constraints</span>: <span class="ident">PathConstraints</span>,
        <span class="ident">rng</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">XorShiftRng</span>,
        <span class="ident">scenario</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Scenario</span>,
        <span class="ident">map</span>: <span class="kw-2">&amp;</span><span class="ident">Map</span>,
        <span class="ident">timer</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Timer</span>,
    ) {
        <span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">num</span> {
            <span class="kw">let</span> <span class="ident">depart</span> <span class="op">=</span> <span class="ident">rand_time</span>(<span class="ident">rng</span>, <span class="self">self</span>.<span class="ident">start_time</span>, <span class="self">self</span>.<span class="ident">stop_time</span>);
            <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">goal</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">goal</span>.<span class="ident">pick_driving_goal</span>(<span class="ident">constraints</span>, <span class="ident">map</span>, <span class="ident">rng</span>, <span class="ident">timer</span>) {
                <span class="kw">let</span> <span class="ident">id</span> <span class="op">=</span> <span class="ident">PersonID</span>(<span class="ident">scenario</span>.<span class="ident">people</span>.<span class="ident">len</span>());
                <span class="ident">scenario</span>.<span class="ident">people</span>.<span class="ident">push</span>(<span class="ident">PersonSpec</span> {
                    <span class="ident">id</span>,
                    <span class="ident">orig_id</span>: <span class="prelude-val">None</span>,
                    <span class="ident">trips</span>: <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">IndividTrip</span>::<span class="ident">new</span>(
                        <span class="ident">depart</span>,
                        <span class="ident">TripPurpose</span>::<span class="ident">Shopping</span>,
                        <span class="ident">SpawnTrip</span>::<span class="ident">FromBorder</span> {
                            <span class="ident">dr</span>: <span class="self">self</span>.<span class="ident">start_from_border</span>,
                            <span class="ident">goal</span>,
                            <span class="ident">is_bike</span>: <span class="ident">constraints</span> <span class="op">==</span> <span class="ident">PathConstraints</span>::<span class="ident">Bike</span>,
                        },
                    )],
                });
            }
        }
    }
}

<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Serialize</span>, <span class="ident">Deserialize</span>, <span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">OriginDestination</span> {
    <span class="ident">Anywhere</span>,
    <span class="ident">EndOfRoad</span>(<span class="ident">DirectedRoadID</span>),
    <span class="ident">GotoBldg</span>(<span class="ident">BuildingID</span>),
}

<span class="kw">impl</span> <span class="ident">OriginDestination</span> {
    <span class="kw">fn</span> <span class="ident">pick_driving_goal</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="ident">rng</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">XorShiftRng</span>,
        <span class="ident">timer</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Timer</span>,
    ) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">DrivingGoal</span><span class="op">&gt;</span> {
        <span class="kw">match</span> <span class="self">self</span> {
            <span class="ident">OriginDestination</span>::<span class="ident">Anywhere</span> <span class="op">=&gt;</span> <span class="prelude-val">Some</span>(<span class="ident">DrivingGoal</span>::<span class="ident">ParkNear</span>(
                <span class="ident">map</span>.<span class="ident">all_buildings</span>().<span class="ident">choose</span>(<span class="ident">rng</span>).<span class="ident">unwrap</span>().<span class="ident">id</span>,
            )),
            <span class="ident">OriginDestination</span>::<span class="ident">GotoBldg</span>(<span class="ident">b</span>) <span class="op">=&gt;</span> <span class="prelude-val">Some</span>(<span class="ident">DrivingGoal</span>::<span class="ident">ParkNear</span>(<span class="kw-2">*</span><span class="ident">b</span>)),
            <span class="ident">OriginDestination</span>::<span class="ident">EndOfRoad</span>(<span class="ident">dr</span>) <span class="op">=&gt;</span> {
                <span class="kw">let</span> <span class="ident">goal</span> <span class="op">=</span> <span class="ident">DrivingGoal</span>::<span class="ident">end_at_border</span>(<span class="kw-2">*</span><span class="ident">dr</span>, <span class="ident">constraints</span>, <span class="ident">map</span>);
                <span class="kw">if</span> <span class="ident">goal</span>.<span class="ident">is_none</span>() {
                    <span class="ident">timer</span>.<span class="ident">warn</span>(<span class="macro">format</span><span class="macro">!</span>(
                        <span class="string">&quot;Can&#39;t spawn a {:?} ending at border {}; no appropriate lanes there&quot;</span>,
                        <span class="ident">constraints</span>, <span class="ident">dr</span>
                    ));
                }
                <span class="ident">goal</span>
            }
        }
    }

    <span class="kw">fn</span> <span class="ident">pick_walking_goal</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="ident">rng</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">XorShiftRng</span>,
        <span class="ident">timer</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Timer</span>,
    ) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">SidewalkSpot</span><span class="op">&gt;</span> {
        <span class="kw">match</span> <span class="self">self</span> {
            <span class="ident">OriginDestination</span>::<span class="ident">Anywhere</span> <span class="op">=&gt;</span> <span class="prelude-val">Some</span>(<span class="ident">SidewalkSpot</span>::<span class="ident">building</span>(
                <span class="ident">map</span>.<span class="ident">all_buildings</span>().<span class="ident">choose</span>(<span class="ident">rng</span>).<span class="ident">unwrap</span>().<span class="ident">id</span>,
                <span class="ident">map</span>,
            )),
            <span class="ident">OriginDestination</span>::<span class="ident">EndOfRoad</span>(<span class="ident">dr</span>) <span class="op">=&gt;</span> {
                <span class="kw">let</span> <span class="ident">goal</span> <span class="op">=</span> <span class="ident">SidewalkSpot</span>::<span class="ident">end_at_border</span>(<span class="ident">dr</span>.<span class="ident">dst_i</span>(<span class="ident">map</span>), <span class="ident">map</span>);
                <span class="kw">if</span> <span class="ident">goal</span>.<span class="ident">is_none</span>() {
                    <span class="ident">timer</span>.<span class="ident">warn</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;Can&#39;t end_at_border for {} without a sidewalk&quot;</span>, <span class="ident">dr</span>));
                }
                <span class="ident">goal</span>
            }
            <span class="ident">OriginDestination</span>::<span class="ident">GotoBldg</span>(<span class="ident">b</span>) <span class="op">=&gt;</span> <span class="prelude-val">Some</span>(<span class="ident">SidewalkSpot</span>::<span class="ident">building</span>(<span class="kw-2">*</span><span class="ident">b</span>, <span class="ident">map</span>)),
        }
    }
}

<span class="kw">fn</span> <span class="ident">rand_time</span>(<span class="ident">rng</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">XorShiftRng</span>, <span class="ident">low</span>: <span class="ident">Time</span>, <span class="ident">high</span>: <span class="ident">Time</span>) <span class="op">-&gt;</span> <span class="ident">Time</span> {
    <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">high</span> <span class="op">&gt;</span> <span class="ident">low</span>);
    <span class="ident">Time</span>::<span class="ident">START_OF_DAY</span> <span class="op">+</span> <span class="ident">Duration</span>::<span class="ident">seconds</span>(<span class="ident">rng</span>.<span class="ident">gen_range</span>(<span class="ident">low</span>.<span class="ident">inner_seconds</span>(), <span class="ident">high</span>.<span class="ident">inner_seconds</span>()))
}
</pre></div>
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