Don't store bus position

src/display.rs

@@ -74,6 +74,7 @@ pub(crate) fn dump_latex_code(route: &[RunState], polys: &[Polygon]) {
 	println!("\\end{{tikzpicture}}");
 }
 
+/*
 pub(crate) fn dump_route(house: Point, polys: &[Polygon], route: &Vec<RunState>) {
 	let (points, lines, route1, route2_start) = gen_params(house, route);
 	print!(
@@ -243,3 +244,4 @@ pub(crate) fn generate_svg(
 
 	document.to_string()
 }
+*/

src/main.rs

@@ -23,8 +23,8 @@ struct RunState {
 	delay: f64,
 	/// Lisas Position
 	pos: Point,
-	/// Position des Busses
+	// Bisher zurückgelegte Strecke
-	bus: Point,
+	total_distance: f64,
 }
 impl cmp::Eq for RunState {}
 impl cmp::Ord for RunState {
@@ -39,14 +39,17 @@ impl cmp::PartialOrd for RunState {
 }
 
 fn main() {
-	// 07:00: Bus ist 15 km entfernt
-	let start_time = NaiveTime::from_hms(7, 0, 0);
-	let bus = Point::new(0.0, -15000.0);
-	let bus_start = bus;
 	// 30 km/h -> 8.3 m/s
 	let bus_speed = 30.0 / 3.6;
+	let lisa_speed = 15.0 / 3.6;
 	// Zeitpunkt basierend auf Wartezeit in Sekunden berechnen
-	let delay_to_time = |delay| start_time + Duration::seconds((delay / bus_speed) as i64);
+	let calc_time = |total_distance, y| {
+		NaiveTime::from_hms(7, 30, 0)
+			- Duration::seconds(((total_distance * 2.0 - y) / bus_speed) as i64)
+	};
+	let calc_end_time = |total_distance, y| {
+		calc_time(total_distance, y) + Duration::seconds((total_distance / lisa_speed) as i64)
+	};
 
 	// Input einlesen (Lisas Haus und Hindernisse)
 	let data = input::read_input();
@@ -62,18 +65,22 @@ fn main() {
 	// Startzustand: Lisa ist an ihrem Haus, Bus noch nicht losgefahren
 	let start = RunState {
 		pos: house,
-		bus: bus,
+		delay: max_possible_delay(0.0, house),
-		delay: max_possible_delay(bus, house),
+		total_distance: 0.0,
 	};
 
-	eprintln!("Theoretisches Maximum: {:?}", delay_to_time(start.delay));
+	let meeting_point = Point::new(0.0, house.y() + 30.0f64.to_radians().tan() * house.x());
+	eprintln!(
+		"Theoretisches Maximum: {:?}",
+		calc_time(distance(meeting_point, house), meeting_point.y())
+	);
 
 	// Zustände in Max-Heap sortieren
 	let mut states = BinaryHeap::new();
 	states.push(vec![start]);
 
 	// beste Lösung speichern
-	let mut best_delay = 0.0;
+	let mut best_delay = f64::NEG_INFINITY;
 	let mut best = vec![];
 	// Zwischenlösungen speichern
 	let save_prefix = "tmp_";
@@ -84,6 +91,7 @@ fn main() {
 		// besten Zustand einlesen
 		let state = states.pop().unwrap();
 		let last = &state[0];
+		println!("last {:?}", last);
 
 		// neue Zustände
 		let mut all = vec![];
@@ -98,25 +106,22 @@ fn main() {
 			.filter(|next| none_intersect(&polys, &Line::new(last.pos, *next)))
 		{
 			// Lisa könnte zu dieser Ecke rennen
-			let bus_next = last.bus.translate(0.0, distance(last.pos, next) * 2.0);
+			let total_distance = last.total_distance + distance(last.pos, next);
-			let delay = max_possible_delay(bus_next, next);
+			let delay = max_possible_delay(total_distance, next);
 			if delay > best_delay {
 				let mut route = state.clone();
 				route.insert(
 					0,
 					RunState {
 						pos: next,
-						bus: bus_next,
 						delay,
+						total_distance,
 					},
 				);
 				all.push(route);
 			}
 		}
 		// versuche, direkt zum Bus zu gehen
-		let bus = last.bus;
-		let range = to_bus(bus, last.pos);
-		if range.len() == 2 {
 		// Lisa trifft Bus mit 60°-Winkel
 		let next = Point::new(
 			0.0,
@@ -125,9 +130,9 @@ fn main() {
 		let line = Line::new(last.pos, next);
 		// freier Weg?
 		if none_intersect(&polys, &line) {
-				let delay = line.end.y
+			let line_length = line.end_point().euclidean_distance(&line.start_point());
-					- bus.y() - line.end_point().euclidean_distance(&line.start_point())
+			let total_distance = last.total_distance + line_length;
-					* 2.0;
+			let delay = max_possible_delay(total_distance, line.end_point());
 			if delay > best_delay {
 				// neue beste Wartezeit
 				let mut route = state.clone();
@@ -135,42 +140,45 @@ fn main() {
 					0,
 					RunState {
 						pos: next,
-							bus: next,
 						delay,
+						total_distance,
 					},
 				);
 				// Verbesserung anzeigen und speichern
 				eprintln!(
 					"Verbesserung: {:?} ({:?}+ Zustände verbleiben)",
-						delay_to_time(delay),
+					calc_time(total_distance, line.end.y),
 					states.len()
 				);
 				best = route;
 				best.reverse();
 				best_delay = delay;
+				/*
 				display::save_svg(
 					&format!("{}{}.svg", save_prefix, save_counter),
 					house,
 					&polys,
 					&best,
 				);
+				*/
 				save_counter += 1;
 			}
 		}
-			// falls Bus überhaupt noch erreicht wird: neu gefundene Routen speichern
+		// neu gefundene Routen speichern
 		states.extend(all);
 	}
-	}
 	eprintln!("Finale Lösung:");
 	let route = best;
-	eprintln!("Startzeit: {:?}", delay_to_time(best_delay));
+	let last = route.last().unwrap();
+	eprintln!(
+		"Startzeit: {:?}",
+		calc_time(last.total_distance, last.pos.y())
+	);
 	eprintln!(
 		"Zielzeit: {:?}",
-		delay_to_time(route.last().unwrap().bus.y() - bus_start.y())
+		calc_end_time(last.total_distance, last.pos.y())
 	);
-	eprintln!("Treffpunkt: y={:.0}", route.last().unwrap().pos.y());
+	eprintln!("Treffpunkt: y={:.0}", last.pos.y());
-	let mut length = 0.0;
-	let mut last = &house;
 	eprintln!("Route:");
 	for s in &route {
 		if s.pos == house {
@@ -187,11 +195,9 @@ fn main() {
 			);
 		}
 		eprintln!("x={:.02} y={:.02}", s.pos.x(), s.pos.y());
-		length += last.euclidean_distance(&s.pos);
-		last = &s.pos;
 	}
-	eprintln!("Länge: {:.0}m", length);
+	eprintln!("Länge: {:.0}m", last.total_distance);
-	let seconds = length / (15.0 / 3.6);
+	let seconds = last.total_distance / (15.0 / 3.6);
 	eprintln!("Dauer: {:02.0}:{:02.0}", seconds / 60.0, seconds % 60.0);
 	// beste Route grafisch ausgeben
 	display::dump_latex_code(&route, &polys);
@@ -235,14 +241,10 @@ fn distance(a: Point, b: Point) -> f64 {
 	((a.x() - b.x()).powi(2) + (a.y() - b.y()).powi(2)).sqrt()
 }
 
-fn max_possible_delay(bus: Point, start: Point) -> f64 {
+fn max_possible_delay(total_distance: f64, lisa: Point) -> f64 {
-	let x_l = start.x();
+	let x_l = lisa.x();
-	let y_l = start.y();
+	let y_l = lisa.y();
-	let x_b = bus.x();
+	y_l - (3.0 * x_l.powi(2)).sqrt() - total_distance * 2.0
-	assert_eq!(x_b, 0.0);
-	let y_b = bus.y();
-
-	y_l - (3.0 * x_l.powi(2)).sqrt() - y_b
 }
 
 /// Gehe direkt zum Bus. Gibt die Punkte zurück, bei denen Lisa nicht auf den Bus warten müsste.