def collide(self, obj):
dist = sqrt((self.pos[0]-obj.pos[0])**2 +
(self.pos[1]-obj.pos[1])**2)
d = util.vsub(obj.pos, self.pos)
par = util.vproj(self.vel, d)
orth = util.vsub(self.vel, par)
if util.vdot(self.vel, d) > 0:
self.force = util.vadd(self.force,
util.vmuls(par, -1.5 * self.mass))
overlap = max(((self.size + obj.size) - dist) / 20.0, .1)
self.force = util.vadd(self.force,
util.vmuls(d, -overlap / dist * self.mass))
def draw(self):
orth = [self.vel[1], -self.vel[0]]
orth = util.vmuls(orth, self.size / util.vmag(orth))
return group(colors.red,
shapes.regular_polygon(self.pos[0], self.pos[1],
30, self.size),
quads(color(1, 0, 0, .5),
self.pos[0] + orth[0], self.pos[1] + orth[1],
self.pos[0] - orth[0], self.pos[1] - orth[1],
color(1, 0, 0, 0),
self.pos[0] - 10*self.vel[0] - orth[0],
self.pos[1] - 10*self.vel[1] - orth[1],
self.pos[0] - 10*self.vel[0] + orth[0],
self.pos[1] - 10*self.vel[1] + orth[1]
))
