how to know pygame.Rect's side that collide to other Rect?

user_14354471 0
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I am using pygame, python3.9, I want to make to return which side(rect1) is collided with rect2. I've already tried this but it dosen't work. I just want internal module and pygame.(sorry for bad english)

def side(rect1, rect2):
    direction = ""
    if rect1.midtop[1] > rect2.midtop[1]:
        direction = "top"
    if rect1.midleft[0] > rect2.midleft[0]:
        direction = "left"
    if rect1.midright[0] < rect2.midright[0]:
        direction = "right"
    if rect1.midbottom[1] < rect2.midbottom[1]:
        direction = "bottom"
    return direction
pygame python-3.x python
1 Answers

The side of the collision depends on the relative moving direction. The side of the collision depends on the relative movement of rect1 and rect2.

Anyway, you can estimate the side by calculating the difference in object position and finding the side with the minimum distance:

dr = abs(rect1.right - rect2.left)
dl = abs(rect1.left - rect2.right)
db = abs(rect1.bottom - rect2.top)
dt = abs(rect1.top - rect2.bottom)

if min(dl, dr) < min(dt, db):
    direction = "left" if dl < dr else "right"
else:
    direction = "bottom" if db < dt else "top"
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