Hit objects in the inner region

src/bin/flat/main.rs

@@ -131,6 +131,7 @@ enum Subspace {
 struct Hit {
 	distance: f32,
 	id: i32,
+	pos: Vec2,
 }
 
 struct FlatTraceResult {
@@ -180,13 +181,19 @@ impl Space {
 		std::iter::successors(Some(ray), |&ray| Some(self.trace_step(ray)))
 	}
 
-	fn trace_inner(&self, ray: Ray) -> Ray {
+	fn trace_inner(&self, ray: Ray) -> FlatTraceResult {
 		assert_eq!(self.which_subspace(ray.pos), Inner);
 		let cell = RectInside { rect: self.rect };
 		let ray = cell.ray_to_local(ray);
+		let objs = Self::trace_to_objects(self.list_objects_inner().as_slice(), ray);
 		let dist = cell.to_boundary(ray).expect("Can't get outta here!");
 		let ray = ray.forward(dist);
-		cell.ray_to_global(ray)
+		FlatTraceResult {
+			end: Some(cell.ray_to_global(ray)),
+			objects: objs.into_iter().filter_map(|Hit { id, distance, pos }|
+				if distance < dist { Some(Hit { id, distance, pos: cell.pos_to_global(pos) }) } else { None }
+			).collect(),
+		}
 	}
 
 	fn trace_outer(&self, ray: Ray) -> FlatTraceResult {
@@ -234,6 +241,26 @@ impl Space {
 		}).collect()
 	}
 
+	fn list_objects_inner(&self) -> Vec<Object> {
+		let cell = RectInside { rect: self.rect };
+		self.objs.iter().map(|&obj| {
+			match self.which_subspace(obj.loc.pos) {
+				Inner | Outer => {
+					// NB: не работает для частей Outer с |y| < external_halflength. Но они и не нужны.
+					Object {
+						id: obj.id,
+						loc: Location {
+							pos: cell.pos_to_local(obj.loc.pos), // в плоской СК для Inner или её продолжении на Outer
+							rot: obj.loc.rot,
+						},
+						r: obj.r,
+					}
+				}
+				Boundary => panic!("Object {} was destroyed by the space curvature", obj.id),
+			}
+		}).collect()
+	}
+
 	fn trace_to_objects(objs: &[Object], ray: Ray) -> Vec<Hit> {
 		objs.iter()
 			.filter_map(|obj| {
@@ -242,7 +269,7 @@ impl Space {
 				if diff > 0.0 {
 					let t = (-rel.dot(ray.dir) - diff.sqrt()) / ray.dir.length_squared();
 					if t >= 0.0 {
-						return Some(Hit { id: obj.id, distance: t });
+						return Some(Hit { id: obj.id, distance: t, pos: ray.forward(t).pos });
 					}
 				}
 				None
@@ -271,27 +298,22 @@ fn draw_ray_2(gc: &mut Vec<Draw>, space: &Space, base: Vec2, dir: Vec2) {
 		// gc.dash_length(6.0);
 		gc.new_path();
 		gc.move_to(ray.pos.x, ray.pos.y);
-		match sub {
-			Inner => {
-				ray = space.trace_inner(ray);
-			}
-			Outer => {
-				let ret = space.trace_outer(ray);
-				for hit in ret.objects {
-					let r = ray.forward(hit.distance);
-					hits.circle(r.pos.x, r.pos.y, 1.5);
-				}
-				ray = match ret.end {
-					Some(r) => r,
-					None => {
-						ray = ray.forward(1000.0 / DT);
-						gc.line_to(ray.pos.x, ray.pos.y);
-						break;
-					}
-				};
-			}
+		let ret = match sub {
+			Inner => space.trace_inner(ray),
+			Outer => space.trace_outer(ray),
 			Boundary => panic!(),
+		};
+		for hit in ret.objects {
+			hits.circle(hit.pos.x, hit.pos.y, 1.5);
 		}
+		ray = match ret.end {
+			Some(r) => r,
+			None => {
+				ray = ray.forward(1000.0 / DT);
+				gc.line_to(ray.pos.x, ray.pos.y);
+				break;
+			}
+		};
 		gc.line_to(ray.pos.x, ray.pos.y);
 		gc.stroke();
 		gc.new_dash_pattern();