You may also find this function useful, which I've pulled out of one of
my games-in-progress (take a look at
http://pen.svn.sourceforge.net/viewvc/pen/data/parts/cannon.py?revision=31&view=markup
for an example):
def rotate_point( pt, rect, angle ):
"""Maps coordinates from a given rectangle into a rotated rectangle.
For example, the following should be approximately equivalent:
pygame.draw.circle( surface, pt, ... )
result = pygame.transform.rotate( surface, angle )
result = pygame.transform.rotate( surface, angle )
pygame.draw.circle( result, rotate_point( pt, rect, angle )
"""
# move the center to the origin, and find the corners
translated = rect.move( -pt[0], -pt[1] )
corners = [translated.topleft, translated.topright,
translated.bottomleft, translated.bottomright]
# rotate the corners
theta = math.radians( angle )
c, s = math.cos( theta ), math.sin( theta )
xcoords = []
ycoords = []
for x,y in corners:
xcoords.append( c*x + s*y )
ycoords.append( c*y - s*x )
# return the leftmost point and the topmost point
return (- min( xcoords ), - min( ycoords ))
--Mike
Ian Mallett wrote:
Opps.
Hadn't found:
http://archives.seul.org/pygame/users/Jun-2006/msg00236.html
Everyone look at that. Very nice. Thanks.
Ian
