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id="404">404</span> <span id="405">405</span> <span id="406">406</span> <span id="407">407</span> <span id="408">408</span> <span id="409">409</span> <span id="410">410</span> <span id="411">411</span> </pre><pre class="rust"><code><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">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">abstio::MapName</span>; <span class="kw">use</span> <span class="ident">abstutil::Timer</span>; <span class="kw">use</span> <span class="ident">map_model::osm::RoadRank</span>; <span class="kw">use</span> <span class="ident">map_model</span>::{<span class="ident">Block</span>, <span class="ident">Map</span>, <span class="ident">Perimeter</span>, <span class="ident">RoadID</span>, <span class="ident">RoadSideID</span>}; <span class="kw">use</span> <span class="ident">widgetry::Color</span>; <span class="kw">use</span> <span class="kw">crate</span>::{<span class="ident">colors</span>, <span class="ident">App</span>}; <span class="doccomment">/// An opaque ID, won't be contiguous as we adjust boundaries</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">PartialEq</span>, <span class="ident">Eq</span>, <span class="ident">PartialOrd</span>, <span class="ident">Ord</span>, <span class="ident">Hash</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">NeighborhoodID</span>(<span class="ident">usize</span>); <span class="doccomment">/// Identifies a single / unmerged block, which never changes</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">PartialEq</span>, <span class="ident">Eq</span>, <span class="ident">PartialOrd</span>, <span class="ident">Ord</span>, <span class="ident">Hash</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">BlockID</span>(<span class="ident">usize</span>); <span class="comment">// Some states want this</span> <span class="kw">impl</span> <span class="ident">widgetry::mapspace::ObjectID</span> <span class="kw">for</span> <span class="ident">NeighborhoodID</span> {} <span class="kw">impl</span> <span class="ident">widgetry::mapspace::ObjectID</span> <span class="kw">for</span> <span class="ident">BlockID</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> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Partitioning</span> { <span class="kw">pub</span> <span class="ident">map</span>: <span class="ident">MapName</span>, <span class="ident">neighborhoods</span>: <span class="ident">BTreeMap</span><span class="op"><</span><span class="ident">NeighborhoodID</span>, (<span class="ident">Block</span>, <span class="ident">Color</span>)<span class="op">></span>, <span class="comment">// The single / unmerged blocks never change</span> <span class="ident">single_blocks</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">Block</span><span class="op">></span>, <span class="ident">neighborhood_id_counter</span>: <span class="ident">usize</span>, <span class="comment">// Invariant: This is a surjection, every block belongs to exactly one neighborhood</span> <span class="ident">block_to_neighborhood</span>: <span class="ident">BTreeMap</span><span class="op"><</span><span class="ident">BlockID</span>, <span class="ident">NeighborhoodID</span><span class="op">></span>, <span class="ident">use_expensive_blockfinding</span>: <span class="ident">bool</span>, } <span class="kw">impl</span> <span class="ident">Partitioning</span> { <span class="doccomment">/// Only valid before the LTN tool has been activated this session</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">empty</span>() -> <span class="ident">Partitioning</span> { <span class="ident">Partitioning</span> { <span class="ident">map</span>: <span class="ident">MapName::new</span>(<span class="string">"zz"</span>, <span class="string">"temp"</span>, <span class="string">"orary"</span>), <span class="ident">neighborhoods</span>: <span class="ident">BTreeMap::new</span>(), <span class="ident">single_blocks</span>: <span class="ident">Vec::new</span>(), <span class="ident">neighborhood_id_counter</span>: <span class="number">0</span>, <span class="ident">block_to_neighborhood</span>: <span class="ident">BTreeMap::new</span>(), <span class="ident">use_expensive_blockfinding</span>: <span class="bool-val">false</span>, } } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_empty</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">bool</span> { <span class="self">self</span>.<span class="ident">neighborhoods</span>.<span class="ident">is_empty</span>() } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">seed_using_heuristics</span>(<span class="ident">app</span>: <span class="kw-2">&</span><span class="ident">App</span>, <span class="ident">timer</span>: <span class="kw-2">&mut</span> <span class="ident">Timer</span>) -> <span class="ident">Partitioning</span> { <span class="comment">// Try the easy thing first, but then give up</span> <span class="lifetime">'METHOD</span>: <span class="kw">for</span> <span class="ident">use_expensive_blockfinding</span> <span class="kw">in</span> [<span class="bool-val">false</span>, <span class="bool-val">true</span>] { <span class="kw">let</span> <span class="ident">map</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">app</span>.<span class="ident">map</span>; <span class="ident">timer</span>.<span class="ident">start</span>(<span class="string">"find single blocks"</span>); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">single_blocks</span> <span class="op">=</span> <span class="ident">Vec::new</span>(); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">single_block_perims</span> <span class="op">=</span> <span class="ident">Vec::new</span>(); <span class="kw">for</span> <span class="kw-2">mut</span> <span class="ident">perim</span> <span class="kw">in</span> <span class="ident">Perimeter::find_all_single_blocks</span>(<span class="ident">map</span>) { <span class="comment">// TODO Some perimeters don't blockify after collapsing dead-ends. So do this</span> <span class="comment">// upfront, and separately work on any blocks that don't show up.</span> <span class="comment">// https://github.com/a-b-street/abstreet/issues/841</span> <span class="ident">perim</span>.<span class="ident">collapse_deadends</span>(); <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="ident">block</span>) <span class="op">=</span> <span class="ident">perim</span>.<span class="ident">to_block</span>(<span class="ident">map</span>) { <span class="ident">single_block_perims</span>.<span class="ident">push</span>(<span class="ident">block</span>.<span class="ident">perimeter</span>.<span class="ident">clone</span>()); <span class="ident">single_blocks</span>.<span class="ident">push</span>(<span class="ident">block</span>); } } <span class="ident">timer</span>.<span class="ident">stop</span>(<span class="string">"find single blocks"</span>); <span class="ident">timer</span>.<span class="ident">start</span>(<span class="string">"partition"</span>); <span class="kw">let</span> <span class="ident">partitions</span> <span class="op">=</span> <span class="ident">Perimeter::partition_by_predicate</span>(<span class="ident">single_block_perims</span>, <span class="op">|</span><span class="ident">r</span><span class="op">|</span> { <span class="comment">// "Interior" roads of a neighborhood aren't classified as arterial</span> <span class="ident">map</span>.<span class="ident">get_r</span>(<span class="ident">r</span>).<span class="ident">get_rank</span>() <span class="op">==</span> <span class="ident">RoadRank::Local</span> }); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">merged</span> <span class="op">=</span> <span class="ident">Vec::new</span>(); <span class="kw">for</span> <span class="ident">perimeters</span> <span class="kw">in</span> <span class="ident">partitions</span> { <span class="comment">// If we got more than one result back, merging partially failed. Oh well?</span> <span class="kw">let</span> <span class="ident">stepwise_debug</span> <span class="op">=</span> <span class="bool-val">false</span>; <span class="ident">merged</span>.<span class="ident">extend</span>(<span class="ident">Perimeter::merge_all</span>( <span class="ident">map</span>, <span class="ident">perimeters</span>, <span class="ident">stepwise_debug</span>, <span class="ident">use_expensive_blockfinding</span>, )); } <span class="ident">timer</span>.<span class="ident">stop</span>(<span class="string">"partition"</span>); <span class="ident">timer</span>.<span class="ident">start_iter</span>(<span class="string">"blockify"</span>, <span class="ident">merged</span>.<span class="ident">len</span>()); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">blocks</span> <span class="op">=</span> <span class="ident">Vec::new</span>(); <span class="kw">for</span> <span class="ident">perimeter</span> <span class="kw">in</span> <span class="ident">merged</span> { <span class="ident">timer</span>.<span class="ident">next</span>(); <span class="kw">match</span> <span class="ident">perimeter</span>.<span class="ident">to_block</span>(<span class="ident">map</span>) { <span class="prelude-val">Ok</span>(<span class="ident">block</span>) => { <span class="ident">blocks</span>.<span class="ident">push</span>(<span class="ident">block</span>); } <span class="prelude-val">Err</span>(<span class="ident">err</span>) => { <span class="macro">warn!</span>(<span class="string">"Failed to make a block from a merged perimeter: {}"</span>, <span class="ident">err</span>); } } } <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">neighborhoods</span> <span class="op">=</span> <span class="ident">BTreeMap::new</span>(); <span class="kw">for</span> <span class="ident">block</span> <span class="kw">in</span> <span class="ident">blocks</span> { <span class="ident">neighborhoods</span>.<span class="ident">insert</span>(<span class="ident">NeighborhoodID</span>(<span class="ident">neighborhoods</span>.<span class="ident">len</span>()), (<span class="ident">block</span>, <span class="ident">Color::CLEAR</span>)); } <span class="kw">let</span> <span class="ident">neighborhood_id_counter</span> <span class="op">=</span> <span class="ident">neighborhoods</span>.<span class="ident">len</span>(); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">p</span> <span class="op">=</span> <span class="ident">Partitioning</span> { <span class="ident">map</span>: <span class="ident">map</span>.<span class="ident">get_name</span>().<span class="ident">clone</span>(), <span class="ident">neighborhoods</span>, <span class="ident">single_blocks</span>, <span class="ident">neighborhood_id_counter</span>, <span class="ident">block_to_neighborhood</span>: <span class="ident">BTreeMap::new</span>(), <span class="ident">use_expensive_blockfinding</span>, }; <span class="comment">// TODO We could probably build this up as we go</span> <span class="kw">for</span> <span class="ident">id</span> <span class="kw">in</span> <span class="ident">p</span>.<span class="ident">all_block_ids</span>() { <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">neighborhood</span>) <span class="op">=</span> <span class="ident">p</span>.<span class="ident">neighborhood_containing</span>(<span class="ident">id</span>) { <span class="ident">p</span>.<span class="ident">block_to_neighborhood</span>.<span class="ident">insert</span>(<span class="ident">id</span>, <span class="ident">neighborhood</span>); } <span class="kw">else</span> { <span class="kw">if</span> <span class="op">!</span><span class="ident">use_expensive_blockfinding</span> { <span class="comment">// Try the expensive check, then</span> <span class="macro">error!</span>( <span class="string">"Block doesn't belong to any neighborhood? Retrying with expensive checks {:?}"</span>, <span class="ident">p</span>.<span class="ident">get_block</span>(<span class="ident">id</span>).<span class="ident">perimeter</span> ); <span class="kw">continue</span> <span class="lifetime">'METHOD</span>; } <span class="comment">// This will break everything downstream, so bail out immediately</span> <span class="macro">panic!</span>( <span class="string">"Block doesn't belong to any neighborhood?! {:?}"</span>, <span class="ident">p</span>.<span class="ident">get_block</span>(<span class="ident">id</span>).<span class="ident">perimeter</span> ); } } <span class="ident">p</span>.<span class="ident">recalculate_coloring</span>(); <span class="kw">return</span> <span class="ident">p</span>; } <span class="macro">unreachable!</span>() } <span class="doccomment">/// True if the coloring changed</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">recalculate_coloring</span>(<span class="kw-2">&mut</span> <span class="self">self</span>) -> <span class="ident">bool</span> { <span class="kw">let</span> <span class="ident">perims</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">Perimeter</span><span class="op">></span> <span class="op">=</span> <span class="self">self</span> .<span class="ident">neighborhoods</span> .<span class="ident">values</span>() .<span class="ident">map</span>(<span class="op">|</span><span class="ident">pair</span><span class="op">|</span> <span class="ident">pair</span>.<span class="number">0</span>.<span class="ident">perimeter</span>.<span class="ident">clone</span>()) .<span class="ident">collect</span>(); <span class="kw">let</span> <span class="ident">colors</span> <span class="op">=</span> <span class="ident">Perimeter::calculate_coloring</span>(<span class="kw-2">&</span><span class="ident">perims</span>, <span class="ident">colors::NEIGHBORHOODS</span>.<span class="ident">len</span>()) .<span class="ident">unwrap_or_else</span>(<span class="op">|</span><span class="op">|</span> (<span class="number">0</span>..<span class="ident">perims</span>.<span class="ident">len</span>()).<span class="ident">collect</span>()); <span class="kw">let</span> <span class="ident">orig_coloring</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">Color</span><span class="op">></span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">neighborhoods</span>.<span class="ident">values</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">pair</span><span class="op">|</span> <span class="ident">pair</span>.<span class="number">1</span>).<span class="ident">collect</span>(); <span class="kw">for</span> (<span class="ident">pair</span>, <span class="ident">color_idx</span>) <span class="kw">in</span> <span class="self">self</span>.<span class="ident">neighborhoods</span>.<span class="ident">values_mut</span>().<span class="ident">zip</span>(<span class="ident">colors</span>.<span class="ident">into_iter</span>()) { <span class="ident">pair</span>.<span class="number">1</span> <span class="op">=</span> <span class="ident">colors::NEIGHBORHOODS</span>[<span class="ident">color_idx</span> <span class="op">%</span> <span class="ident">colors::NEIGHBORHOODS</span>.<span class="ident">len</span>()]; } <span class="kw">let</span> <span class="ident">new_coloring</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">Color</span><span class="op">></span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">neighborhoods</span>.<span class="ident">values</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">pair</span><span class="op">|</span> <span class="ident">pair</span>.<span class="number">1</span>).<span class="ident">collect</span>(); <span class="ident">orig_coloring</span> <span class="op">!</span><span class="op">=</span> <span class="ident">new_coloring</span> } <span class="comment">// TODO Explain return value</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">transfer_block</span>( <span class="kw-2">&mut</span> <span class="self">self</span>, <span class="ident">map</span>: <span class="kw-2">&</span><span class="ident">Map</span>, <span class="ident">id</span>: <span class="ident">BlockID</span>, <span class="ident">old_owner</span>: <span class="ident">NeighborhoodID</span>, <span class="ident">new_owner</span>: <span class="ident">NeighborhoodID</span>, ) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">NeighborhoodID</span><span class="op">></span><span class="op">></span> { <span class="macro">assert_ne!</span>(<span class="ident">old_owner</span>, <span class="ident">new_owner</span>); <span class="comment">// Is the newly expanded neighborhood a valid perimeter?</span> <span class="kw">let</span> <span class="ident">new_owner_blocks</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">BlockID</span><span class="op">></span> <span class="op">=</span> <span class="self">self</span> .<span class="ident">block_to_neighborhood</span> .<span class="ident">iter</span>() .<span class="ident">filter_map</span>(<span class="op">|</span>(<span class="ident">block</span>, <span class="ident">neighborhood</span>)<span class="op">|</span> { <span class="kw">if</span> <span class="kw-2">*</span><span class="ident">neighborhood</span> <span class="op">==</span> <span class="ident">new_owner</span> <span class="op">|</span><span class="op">|</span> <span class="kw-2">*</span><span class="ident">block</span> <span class="op">==</span> <span class="ident">id</span> { <span class="prelude-val">Some</span>(<span class="kw-2">*</span><span class="ident">block</span>) } <span class="kw">else</span> { <span class="prelude-val">None</span> } }) .<span class="ident">collect</span>(); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">new_neighborhood_blocks</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">make_merged_blocks</span>(<span class="ident">map</span>, <span class="ident">new_owner_blocks</span>)<span class="question-mark">?</span>; <span class="kw">if</span> <span class="ident">new_neighborhood_blocks</span>.<span class="ident">len</span>() <span class="op">!</span><span class="op">=</span> <span class="number">1</span> { <span class="comment">// This happens when a hole would be created by adding this block. There are probably</span> <span class="comment">// some smaller blocks nearby to add first.</span> <span class="macro">bail!</span>(<span class="string">"Couldn't add block -- you may need to add an intermediate block first to avoid a hole, or there's a bug you can't workaround yet"</span>); } <span class="kw">let</span> <span class="ident">new_neighborhood_block</span> <span class="op">=</span> <span class="ident">new_neighborhood_blocks</span>.<span class="ident">pop</span>().<span class="ident">unwrap</span>(); <span class="comment">// Is the old neighborhood, minus this block, still valid?</span> <span class="comment">// TODO refactor Neighborhood to BlockIDs?</span> <span class="kw">let</span> <span class="ident">old_owner_blocks</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">BlockID</span><span class="op">></span> <span class="op">=</span> <span class="self">self</span> .<span class="ident">block_to_neighborhood</span> .<span class="ident">iter</span>() .<span class="ident">filter_map</span>(<span class="op">|</span>(<span class="ident">block</span>, <span class="ident">neighborhood</span>)<span class="op">|</span> { <span class="kw">if</span> <span class="kw-2">*</span><span class="ident">neighborhood</span> <span class="op">==</span> <span class="ident">old_owner</span> <span class="op">&&</span> <span class="kw-2">*</span><span class="ident">block</span> <span class="op">!</span><span class="op">=</span> <span class="ident">id</span> { <span class="prelude-val">Some</span>(<span class="kw-2">*</span><span class="ident">block</span>) } <span class="kw">else</span> { <span class="prelude-val">None</span> } }) .<span class="ident">collect</span>(); <span class="kw">if</span> <span class="ident">old_owner_blocks</span>.<span class="ident">is_empty</span>() { <span class="comment">// We're deleting the old neighborhood!</span> <span class="self">self</span>.<span class="ident">neighborhoods</span>.<span class="ident">get_mut</span>(<span class="kw-2">&</span><span class="ident">new_owner</span>).<span class="ident">unwrap</span>().<span class="number">0</span> <span class="op">=</span> <span class="ident">new_neighborhood_block</span>; <span class="self">self</span>.<span class="ident">neighborhoods</span>.<span class="ident">remove</span>(<span class="kw-2">&</span><span class="ident">old_owner</span>).<span class="ident">unwrap</span>(); <span class="self">self</span>.<span class="ident">block_to_neighborhood</span>.<span class="ident">insert</span>(<span class="ident">id</span>, <span class="ident">new_owner</span>); <span class="comment">// Tell the caller to recreate this SelectBoundary state, switching to the neighborhood</span> <span class="comment">// we just donated to, since the old is now gone</span> <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(<span class="ident">new_owner</span>)); } <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">old_neighborhood_blocks</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">make_merged_blocks</span>(<span class="ident">map</span>, <span class="ident">old_owner_blocks</span>.<span class="ident">clone</span>())<span class="question-mark">?</span>; <span class="comment">// We might be splitting the old neighborhood into multiple pieces! Pick the largest piece</span> <span class="comment">// as the old_owner (so the UI for trimming a neighborhood is less jarring), and create new</span> <span class="comment">// neighborhoods for the others.</span> <span class="ident">old_neighborhood_blocks</span>.<span class="ident">sort_by_key</span>(<span class="op">|</span><span class="ident">block</span><span class="op">|</span> <span class="ident">block</span>.<span class="ident">perimeter</span>.<span class="ident">interior</span>.<span class="ident">len</span>()); <span class="self">self</span>.<span class="ident">neighborhoods</span>.<span class="ident">get_mut</span>(<span class="kw-2">&</span><span class="ident">old_owner</span>).<span class="ident">unwrap</span>().<span class="number">0</span> <span class="op">=</span> <span class="ident">old_neighborhood_blocks</span>.<span class="ident">pop</span>().<span class="ident">unwrap</span>(); <span class="kw">let</span> <span class="ident">new_splits</span> <span class="op">=</span> <span class="op">!</span><span class="ident">old_neighborhood_blocks</span>.<span class="ident">is_empty</span>(); <span class="kw">for</span> <span class="ident">split_piece</span> <span class="kw">in</span> <span class="ident">old_neighborhood_blocks</span> { <span class="kw">let</span> <span class="ident">new_neighborhood</span> <span class="op">=</span> <span class="ident">NeighborhoodID</span>(<span class="self">self</span>.<span class="ident">neighborhood_id_counter</span>); <span class="self">self</span>.<span class="ident">neighborhood_id_counter</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>; <span class="comment">// Temporary color</span> <span class="self">self</span>.<span class="ident">neighborhoods</span> .<span class="ident">insert</span>(<span class="ident">new_neighborhood</span>, (<span class="ident">split_piece</span>, <span class="ident">Color::CLEAR</span>)); } <span class="kw">if</span> <span class="ident">new_splits</span> { <span class="comment">// We need to update the owner of all single blocks in these new pieces</span> <span class="kw">for</span> <span class="ident">id</span> <span class="kw">in</span> <span class="ident">old_owner_blocks</span> { <span class="self">self</span>.<span class="ident">block_to_neighborhood</span> .<span class="ident">insert</span>(<span class="ident">id</span>, <span class="self">self</span>.<span class="ident">neighborhood_containing</span>(<span class="ident">id</span>).<span class="ident">unwrap</span>()); } } <span class="self">self</span>.<span class="ident">neighborhoods</span>.<span class="ident">get_mut</span>(<span class="kw-2">&</span><span class="ident">new_owner</span>).<span class="ident">unwrap</span>().<span class="number">0</span> <span class="op">=</span> <span class="ident">new_neighborhood_block</span>; <span class="self">self</span>.<span class="ident">block_to_neighborhood</span>.<span class="ident">insert</span>(<span class="ident">id</span>, <span class="ident">new_owner</span>); <span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>) } <span class="doccomment">/// Needs to find an existing neighborhood to take the block, or make a new one</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">remove_block_from_neighborhood</span>( <span class="kw-2">&mut</span> <span class="self">self</span>, <span class="ident">map</span>: <span class="kw-2">&</span><span class="ident">Map</span>, <span class="ident">id</span>: <span class="ident">BlockID</span>, <span class="ident">old_owner</span>: <span class="ident">NeighborhoodID</span>, ) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">NeighborhoodID</span><span class="op">></span><span class="op">></span> { <span class="comment">// Find all RoadSideIDs in the block matching the current neighborhood perimeter. Look for</span> <span class="comment">// the first one that borders another neighborhood, and transfer the block there.</span> <span class="comment">// TODO This can get unintuitive -- if we remove a block bordering two other</span> <span class="comment">// neighborhoods, which one should we donate to?</span> <span class="kw">let</span> <span class="ident">current_perim_set</span>: <span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">RoadSideID</span><span class="op">></span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">neighborhoods</span>[<span class="kw-2">&</span><span class="ident">old_owner</span>] .<span class="number">0</span> .<span class="ident">perimeter</span> .<span class="ident">roads</span> .<span class="ident">iter</span>() .<span class="ident">cloned</span>() .<span class="ident">collect</span>(); <span class="kw">for</span> <span class="ident">road_side</span> <span class="kw">in</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">get_block</span>(<span class="ident">id</span>).<span class="ident">perimeter</span>.<span class="ident">roads</span> { <span class="kw">if</span> <span class="op">!</span><span class="ident">current_perim_set</span>.<span class="ident">contains</span>(<span class="ident">road_side</span>) { <span class="kw">continue</span>; } <span class="comment">// Is there another neighborhood that has the other side of this road on its perimeter?</span> <span class="comment">// TODO We could map road -> BlockID then use block_to_neighborhood</span> <span class="kw">let</span> <span class="ident">other_side</span> <span class="op">=</span> <span class="ident">road_side</span>.<span class="ident">other_side</span>(); <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>((<span class="ident">new_owner</span>, <span class="kw">_</span>)) <span class="op">=</span> <span class="self">self</span> .<span class="ident">neighborhoods</span> .<span class="ident">iter</span>() .<span class="ident">find</span>(<span class="op">|</span>(<span class="kw">_</span>, (<span class="ident">block</span>, <span class="kw">_</span>))<span class="op">|</span> <span class="ident">block</span>.<span class="ident">perimeter</span>.<span class="ident">roads</span>.<span class="ident">contains</span>(<span class="kw-2">&</span><span class="ident">other_side</span>)) { <span class="kw">let</span> <span class="ident">new_owner</span> <span class="op">=</span> <span class="kw-2">*</span><span class="ident">new_owner</span>; <span class="kw">return</span> <span class="self">self</span>.<span class="ident">transfer_block</span>(<span class="ident">map</span>, <span class="ident">id</span>, <span class="ident">old_owner</span>, <span class="ident">new_owner</span>); } } <span class="comment">// We didn't find any match, so we're jettisoning a block near the edge of the map (or a</span> <span class="comment">// buggy area missing blocks). Create a new neighborhood with just this block.</span> <span class="kw">let</span> <span class="ident">new_owner</span> <span class="op">=</span> <span class="ident">NeighborhoodID</span>(<span class="self">self</span>.<span class="ident">neighborhood_id_counter</span>); <span class="self">self</span>.<span class="ident">neighborhood_id_counter</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>; <span class="comment">// Temporary color</span> <span class="self">self</span>.<span class="ident">neighborhoods</span> .<span class="ident">insert</span>(<span class="ident">new_owner</span>, (<span class="self">self</span>.<span class="ident">get_block</span>(<span class="ident">id</span>).<span class="ident">clone</span>(), <span class="ident">Color::CLEAR</span>)); <span class="kw">let</span> <span class="ident">result</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">transfer_block</span>(<span class="ident">map</span>, <span class="ident">id</span>, <span class="ident">old_owner</span>, <span class="ident">new_owner</span>); <span class="kw">if</span> <span class="ident">result</span>.<span class="ident">is_err</span>() { <span class="comment">// Revert the change above!</span> <span class="self">self</span>.<span class="ident">neighborhoods</span>.<span class="ident">remove</span>(<span class="kw-2">&</span><span class="ident">new_owner</span>).<span class="ident">unwrap</span>(); } <span class="ident">result</span> } } <span class="comment">// Read-only</span> <span class="kw">impl</span> <span class="ident">Partitioning</span> { <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">neighborhood_block</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">id</span>: <span class="ident">NeighborhoodID</span>) -> <span class="kw-2">&</span><span class="ident">Block</span> { <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">neighborhoods</span>[<span class="kw-2">&</span><span class="ident">id</span>].<span class="number">0</span> } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">neighborhood_area_km2</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">id</span>: <span class="ident">NeighborhoodID</span>) -> <span class="ident">String</span> { <span class="comment">// Convert from m^2 to km^2</span> <span class="kw">let</span> <span class="ident">area</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">neighborhood_block</span>(<span class="ident">id</span>).<span class="ident">polygon</span>.<span class="ident">area</span>() <span class="op">/</span> <span class="number">1_000_000.0</span>; <span class="macro">format!</span>(<span class="string">"~{:.1} km²"</span>, <span class="ident">area</span>) } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">neighborhood_color</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">id</span>: <span class="ident">NeighborhoodID</span>) -> <span class="ident">Color</span> { <span class="self">self</span>.<span class="ident">neighborhoods</span>[<span class="kw-2">&</span><span class="ident">id</span>].<span class="number">1</span> } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">all_neighborhoods</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span><span class="ident">BTreeMap</span><span class="op"><</span><span class="ident">NeighborhoodID</span>, (<span class="ident">Block</span>, <span class="ident">Color</span>)<span class="op">></span> { <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">neighborhoods</span> } <span class="comment">// Just used for initial creation</span> <span class="kw">fn</span> <span class="ident">neighborhood_containing</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">find_block</span>: <span class="ident">BlockID</span>) -> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">NeighborhoodID</span><span class="op">></span> { <span class="comment">// TODO We could probably build this mapping up when we do Perimeter::merge_all</span> <span class="kw">let</span> <span class="ident">find_block</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">get_block</span>(<span class="ident">find_block</span>); <span class="kw">for</span> (<span class="ident">id</span>, (<span class="ident">block</span>, <span class="kw">_</span>)) <span class="kw">in</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">neighborhoods</span> { <span class="kw">if</span> <span class="ident">block</span>.<span class="ident">perimeter</span>.<span class="ident">contains</span>(<span class="kw-2">&</span><span class="ident">find_block</span>.<span class="ident">perimeter</span>) { <span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="kw-2">*</span><span class="ident">id</span>); } } <span class="prelude-val">None</span> } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">all_single_blocks</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">Vec</span><span class="op"><</span>(<span class="ident">BlockID</span>, <span class="kw-2">&</span><span class="ident">Block</span>)<span class="op">></span> { <span class="self">self</span>.<span class="ident">single_blocks</span> .<span class="ident">iter</span>() .<span class="ident">enumerate</span>() .<span class="ident">map</span>(<span class="op">|</span>(<span class="ident">idx</span>, <span class="ident">block</span>)<span class="op">|</span> (<span class="ident">BlockID</span>(<span class="ident">idx</span>), <span class="ident">block</span>)) .<span class="ident">collect</span>() } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">all_block_ids</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">Vec</span><span class="op"><</span><span class="ident">BlockID</span><span class="op">></span> { (<span class="number">0</span>..<span class="self">self</span>.<span class="ident">single_blocks</span>.<span class="ident">len</span>()).<span class="ident">map</span>(<span class="ident">BlockID</span>).<span class="ident">collect</span>() } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_block</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">id</span>: <span class="ident">BlockID</span>) -> <span class="kw-2">&</span><span class="ident">Block</span> { <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">single_blocks</span>[<span class="ident">id</span>.<span class="number">0</span>] } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">block_to_neighborhood</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">id</span>: <span class="ident">BlockID</span>) -> <span class="ident">NeighborhoodID</span> { <span class="self">self</span>.<span class="ident">block_to_neighborhood</span>[<span class="kw-2">&</span><span class="ident">id</span>] } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">all_blocks_in_neighborhood</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">id</span>: <span class="ident">NeighborhoodID</span>) -> <span class="ident">Vec</span><span class="op"><</span><span class="ident">BlockID</span><span class="op">></span> { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">result</span> <span class="op">=</span> <span class="ident">Vec::new</span>(); <span class="kw">for</span> (<span class="ident">block</span>, <span class="ident">n</span>) <span class="kw">in</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">block_to_neighborhood</span> { <span class="kw">if</span> <span class="kw-2">*</span><span class="ident">n</span> <span class="op">==</span> <span class="ident">id</span> { <span class="ident">result</span>.<span class="ident">push</span>(<span class="kw-2">*</span><span class="ident">block</span>); } } <span class="ident">result</span> } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">some_block_in_neighborhood</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">id</span>: <span class="ident">NeighborhoodID</span>) -> <span class="ident">BlockID</span> { <span class="kw">for</span> (<span class="ident">block</span>, <span class="ident">neighborhood</span>) <span class="kw">in</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">block_to_neighborhood</span> { <span class="kw">if</span> <span class="ident">id</span> <span class="op">==</span> <span class="kw-2">*</span><span class="ident">neighborhood</span> { <span class="kw">return</span> <span class="kw-2">*</span><span class="ident">block</span>; } } <span class="macro">unreachable!</span>(<span class="string">"{:?} has no blocks"</span>, <span class="ident">id</span>); } <span class="doccomment">/// Blocks on the "frontier" are adjacent to the perimeter, either just inside or outside.</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">calculate_frontier</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">perim</span>: <span class="kw-2">&</span><span class="ident">Perimeter</span>) -> <span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">BlockID</span><span class="op">></span> { <span class="kw">let</span> <span class="ident">perim_roads</span>: <span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">RoadID</span><span class="op">></span> <span class="op">=</span> <span class="ident">perim</span>.<span class="ident">roads</span>.<span class="ident">iter</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">id</span><span class="op">|</span> <span class="ident">id</span>.<span class="ident">road</span>).<span class="ident">collect</span>(); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">frontier</span> <span class="op">=</span> <span class="ident">BTreeSet::new</span>(); <span class="kw">for</span> (<span class="ident">block_id</span>, <span class="ident">block</span>) <span class="kw">in</span> <span class="self">self</span>.<span class="ident">all_single_blocks</span>() { <span class="kw">for</span> <span class="ident">road_side_id</span> <span class="kw">in</span> <span class="kw-2">&</span><span class="ident">block</span>.<span class="ident">perimeter</span>.<span class="ident">roads</span> { <span class="comment">// If the perimeter has this RoadSideID on the same side, we're just inside. If it has</span> <span class="comment">// the other side, just on the outside. Either way, on the frontier.</span> <span class="kw">if</span> <span class="ident">perim_roads</span>.<span class="ident">contains</span>(<span class="kw-2">&</span><span class="ident">road_side_id</span>.<span class="ident">road</span>) { <span class="ident">frontier</span>.<span class="ident">insert</span>(<span class="ident">block_id</span>); <span class="kw">break</span>; } } } <span class="ident">frontier</span> } <span class="comment">// Possibly returns multiple merged blocks. The input is never "lost" -- if any perimeter fails</span> <span class="comment">// to become a block, fail the whole operation.</span> <span class="kw">fn</span> <span class="ident">make_merged_blocks</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">map</span>: <span class="kw-2">&</span><span class="ident">Map</span>, <span class="ident">input</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">BlockID</span><span class="op">></span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">Block</span><span class="op">></span><span class="op">></span> { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">perimeters</span> <span class="op">=</span> <span class="ident">Vec::new</span>(); <span class="kw">for</span> <span class="ident">id</span> <span class="kw">in</span> <span class="ident">input</span> { <span class="ident">perimeters</span>.<span class="ident">push</span>(<span class="self">self</span>.<span class="ident">get_block</span>(<span class="ident">id</span>).<span class="ident">perimeter</span>.<span class="ident">clone</span>()); } <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">blocks</span> <span class="op">=</span> <span class="ident">Vec::new</span>(); <span class="kw">let</span> <span class="ident">stepwise_debug</span> <span class="op">=</span> <span class="bool-val">false</span>; <span class="kw">for</span> <span class="ident">perim</span> <span class="kw">in</span> <span class="ident">Perimeter::merge_all</span>( <span class="ident">map</span>, <span class="ident">perimeters</span>, <span class="ident">stepwise_debug</span>, <span class="self">self</span>.<span class="ident">use_expensive_blockfinding</span>, ) { <span class="ident">blocks</span>.<span class="ident">push</span>(<span class="ident">perim</span>.<span class="ident">to_block</span>(<span class="ident">map</span>)<span class="question-mark">?</span>); } <span class="prelude-val">Ok</span>(<span class="ident">blocks</span>) } } </code></pre></div> </section><section id="search" class="content hidden"></section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="ltn" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.60.0 (7737e0b5c 2022-04-04)" ></div> </body></html>