ps. I like your Struct class there! very clever, haven't seen that before.
cu,
On Mon, Feb 23, 2009 at 8:53 AM, B W <stabbingfin...@gmail.com> wrote:
> I did the following, which adequately fit my needs. Unfortunately
> there is some ambiguity to overcome. For example, if one rect is
> moving at speed 5,5 and the other at -5,-5 their corners will collide.
> In this case two sides are in contact and you must quantify it in
> program code to decide which way they should rebound.
>
> class Struct(object):
> def __init__(self, **entries):
> self.__dict__.update(entries)
>
> def collide_edges(r, other):
> """Detect the edges of rectangle r that collide with rectangle
> other. Returns an ad hoc object with boolean attributes left,
> right, top, and bottom whose values indicate whether that side
> collided."""
> Rect = pygame.Rect
> side = Struct(left=False, right=False, top=False, bottom=False)
> left=Rect(r.left, r.top+1, 1, r.height-2)
> right=Rect(r.right, r.top+1, 1, r.height-2)
> top=Rect(r.left+1, r.top, r.width-2, 1)
> bottom=Rect(r.left+1, r.bottom, r.width-2, 1)
> if left.colliderect(other):
> side.left = True
> if right.colliderect(other):
> side.right = True
> if bottom.colliderect(other):
> side.bottom = True
> if top.colliderect(other):
> side.top = True
> return side
>
> if __name__ == '__main__':
> pygame.init()
> r1 = pygame.Rect(1,1,10,10)
> r2 = pygame.Rect(9,9,10,10)
> edges = collide_edges(r1, r2)
> print '%s: %s' % ('left',edges.left)
> print '%s: %s' % ('right',edges.right)
> print '%s: %s' % ('top',edges.top)
> print '%s: %s' % ('bottom',edges.bottom)
>
> fin
>
> On Sun, Feb 22, 2009 at 1:21 PM, Daniel Mateos <dan...@mateos.cc> wrote:
>> Hey,
>>
>> Can anyone suggest a good way to do collision detection between two
>> rects in a way that i can also get the side of the rect that the
>> collision was detected on.
>>
>> --
>> Daniel Mateos
>> http://daniel.mateos.cc
>>
>>
>
