def draw_car(self):
verts = self.translate_vertices(self.rotate_polygon(CAR_BODY, self.car_orn, [0, 0]), self.car_pos)
self.update_object_coords(self.car[0], verts)
# We have to rotate the local transformation of the front-AABB
verts = self.translate_vertices(self.rotate_polygon(CAR_FRONT, self.car_orn, [0, 0]), self.car_pos)
rot = m2d.rot_vec(FRONT_TRANS, self.car_orn)
verts = list(map(lambda x: m2d.add(x, rot), verts))
self.update_object_coords(self.car[1], verts)
ray_points = []
for i in range(2, 2 + self.car_rays):
vec = m2d.rot_vec(RAY_LINE, self.car_orn + i*self.ray_dtheta)
self.update_object_coords(self.car[i], [self.car_pos, m2d.add(self.car_pos, vec)])
ray_points.append(m2d.add(self.car_pos, vec))
i1 = len(ray_points) - 1
for i0 in range(self.car_rays):
i = i0 + 2 + self.car_rays
self.update_object_coords(self.car[i], [ray_points[i1], ray_points[i0]])
i1 = i0
# Test each rectangle that has not been seen against the ray triangles
i1 = len(ray_points) - 1
for i0 in range(self.car_rays):
tri = [self.car_pos, ray_points[i1], ray_points[i0]]
if not m2d.is_ccw(tri): tri.reverse()
for j in range(len(self.floor_polys)):
if self.floors_seen[j]: continue
elif m2d.test_intersection(tri, self.floor_polys[j]):
self.canvas.itemconfig(self.floors_id[j], fill='lightblue')
self.floors_seen[j] = True
i1 = i0
def visit_tiles(self, scale, car_pos, ray_points):
# Test each ray against each polygon, if intersecting, rasterise the triangle into the buffer, setting the
# visible flag to true (0, 0, 0), i.e. black, if the pixel has been visited
# Return an index containing the tile ids updated
changed = []
car_rays = len(ray_points)
i1 = len(ray_points) - 1
for i0 in range(car_rays):
tri = [car_pos, ray_points[i1], ray_points[i0]]
if not m2d.is_ccw(tri):
tri.reverse()
for tile in range(self.poly_count()):
LB, TR = self.get_poly(tile)
poly = verts([LB, TR])
if m2d.test_intersection(tri, poly):
w = int(TR[0] - LB[0])
h = int(LB[1] - TR[1]) # Y is flipped
img = self.images[tile]
img_w, img_h = img.size
pixels = list(img.getdata())
cx = int(LB[0] + w / 2)
cy = int(LB[1] - h / 2)
def cb(coord):
if 0 <= coord[0] < img_w and 0 <= coord[1] < img_h:
idx = coord[1] * img_w + coord[0]
if 0 < idx < len(pixels):
pixels[idx] = (0, 0, 0)
itri = list(
map(
lambda x: [
int(round((x[0] - cx + w / 2) / scale[0], 4)),
int(round((x[1] - cy + h / 2) / scale[1], 4))
], tri))
tr.rasterise(itri, cb)
img.putdata(pixels)
changed.append(tile)
i1 = i0
return changed
