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added bounding box intersection func, to find the intersecting region of two boxes

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David Vierra 2010-12-17 08:21:59 -10:00
parent ec2c3c4a1d
commit 475d525c75
1 changed files with 21 additions and 0 deletions
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21
box.py
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@ -104,6 +104,27 @@ class BoundingBox (object):
def isChunkAligned(self): def isChunkAligned(self):
return (self.origin[0] & 0xf == 0) and (self.origin[2] & 0xf == 0) return (self.origin[0] & 0xf == 0) and (self.origin[2] & 0xf == 0)
def intersect(self, box):
""" return a box containing the area self and box have in common"""
newbox = BoundingBox()
if self.minx > box.maxx or self.maxx < box.minx: return BoundingBox()
newbox.minx = max(self.minx, box.minx)
newbox.maxx = min(self.maxx, box.maxx)
if self.miny > box.maxy or self.maxy < box.miny: return BoundingBox()
newbox.miny = max(self.miny, box.miny)
newbox.maxy = min(self.maxy, box.maxy)
if self.minz > box.maxz or self.maxz < box.minz: return BoundingBox()
newbox.minz = max(self.minz, box.minz)
newbox.maxz = min(self.maxz, box.maxz)
print "Intersect of {0} and {1}: {2}".format(self, box, newbox)
return newbox
def __contains__(self, pos): def __contains__(self, pos):
x,y,z = pos; x,y,z = pos;
if x<self.minx or x>=self.maxx: return False if x<self.minx or x>=self.maxx: return False