def find_tangent_points(self, coord):
#TODO can be convex hull instead of all coords
tan_coords = []
for c in self.coords:
vec_to_c = coord.vec_to_coord(c)
test_coord1 = c.coord_of_vec(Vector.Polar(0.001, vec_to_c.heading))
test_coord2 = c.coord_of_vec(Vector.Polar(-0.001, vec_to_c.heading))
if self.contains(test_coord1) or self.contains(test_coord2):
continue
tan_coords.append(c)
return tan_coords
def buffer(self, dist):
new_coords = []
if ccw(self.coords):
is_ccw = True
else:
is_ccw = False
for i in range(len(self.coords)):
j = (i+1) % len(self.coords)
k = (i+2) % len(self.coords)
vec1 = self.coords[i].vec_to_coord(self.coords[j])
vec2 = self.coords[j].vec_to_coord(self.coords[k])
if is_ccw:
psi = radians(90)
else:
psi = -radians(90)
perp_vec1 = Vector.Polar(dist, vec1.heading+psi)
perp_vec2 = Vector.Polar(dist, vec2.heading+psi)
# push walls out to make two lines
c1 = self.coords[i].coord_of_vec(perp_vec1)
c2 = self.coords[j].coord_of_vec(perp_vec1)
c3 = self.coords[j].coord_of_vec(perp_vec2)
c4 = self.coords[k].coord_of_vec(perp_vec2)
# use coordinate of where those lines intersect TODO will need to change this
x1, y1 = [0, 0]
x2, y2 = c1.vec_to_coord(c2)._to_rect()
x3, y3 = c1.vec_to_coord(c3)._to_rect()
x4, y4 = c1.vec_to_coord(c4)._to_rect()
px, py = find_intersection_point([x1, y1], [x2,y2], [x3,y3], [x4,y4])
vec_to_intersection = Vector.XY(px, py)
new_coord = c1.coord_of_vec(vec_to_intersection)
colors = ['purple', 'orange', 'black', 'blue']
#new_coords.append(new_coord)
new_coords.append(c1)
new_coords.append(c2)
new_poly = Polygon(new_coords)
return new_poly