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An automatic LTN heuristic that closes all but one border

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This commit is contained in:
Dustin Carlino 2022-01-12 12:23:20 +00:00
parent 8e26fd2fb5
commit 30fc96bdd0
1 changed files with 32 additions and 0 deletions
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32
game/src/ltn/auto.rs
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@ -19,6 +19,9 @@ pub enum Heuristic {
/// Try adding one filter to every possible road, counting the rat-runs after. Choose the next
/// step by the least resulting rat runs.
BruteForce,
/// Per cell, close all borders except for one. This doesn't affect connectivity, but prevents
/// all rat-runs.
OnlyOneBorder,
}
impl Heuristic {
@ -26,6 +29,7 @@ impl Heuristic {
vec![
Choice::new("greedy", Heuristic::Greedy),
Choice::new("brute-force", Heuristic::BruteForce),
Choice::new("only one border", Heuristic::OnlyOneBorder),
]
}
@ -54,6 +58,7 @@ impl Heuristic {
match self {
Heuristic::Greedy => greedy(ctx, app, neighborhood, timer),
Heuristic::BruteForce => brute_force(ctx, app, neighborhood, timer),
Heuristic::OnlyOneBorder => only_one_border(app),
}
}
}
@ -117,6 +122,33 @@ fn brute_force(ctx: &EventCtx, app: &mut App, neighborhood: &Neighborhood, timer
}
}
fn only_one_border(app: &mut App, neighborhood: &Neighborhood) {
for cell in &neighborhood.cells {
if cell.borders.len() > 1 {
// TODO How to pick which one to leave open?
for i in cell.borders.iter().skip(1) {
// Find the road in this cell connected to this border
for r in cell.roads.keys() {
let road = app.primary.map.get_r(*r);
if road.src_i == *i {
app.session
.modal_filters
.roads
.insert(road.id, 0.1 * road.length());
break;
} else if road.dst_i == *i {
app.session
.modal_filters
.roads
.insert(road.id, 0.9 * road.length());
break;
}
}
}
}
}
}
// If successful, returns a Neighborhood and leaves the new filter in place. If it disconncts a
// cell, reverts the change and returns None
fn try_to_filter_road(