def getPolygon(self, x, y):
""" Returns the polygon that fills the coordinate x, y.
What is returned is a list of the form
(x1, y1, x2, y2, ...). If there is no polyon,
None is returned. If there are multiple polygons,
the polygon with the lowest index (first polygon in
the list) is returned. """
whichPolygon = insideWhichPolygon(
self.polygonsX, self.polygonsY, self.polygonBeginningsIndex, self.polygonNumberOfItems, x, y
)
# not inside any polygon
if whichPolygon == -1:
return None
index = self.polygonBeginningsIndex[whichPolygon]
numberOfItems = self.polygonNumberOfItems[whichPolygon]
polygon = []
# pull out just the interesting polygon and flatten it
# so it can easily be displayed
for i in range(numberOfItems):
polygon += self.polygonsX[index + i], self.polygonsY[index + i]
return polygon
def getPolygon(self, x, y):
""" Returns the polygon that fills the coordinate x, y.
What is returned is a list of the form
(x1, y1, x2, y2, ...). If there is no polyon,
None is returned. If there are multiple polygons,
the polygon with the lowest index (first polygon in
the list) is returned. """
whichPolygon = insideWhichPolygon(self.polygonsX, self.polygonsY,
self.polygonBeginningsIndex,
self.polygonNumberOfItems, x, y)
# not inside any polygon
if whichPolygon == -1:
return None
index = self.polygonBeginningsIndex[whichPolygon]
numberOfItems = self.polygonNumberOfItems[whichPolygon]
polygon = []
# pull out just the interesting polygon and flatten it
# so it can easily be displayed
for i in range(numberOfItems):
polygon += self.polygonsX[index + i], self.polygonsY[index + i]
return polygon
def removePolygon(self, x, y):
""" Removes the polygon that fills the coordinate x, y
If there are multiple polygons, the polygon with
the lowest index (first polygon in the list) is
returned. Returns 1 if a polygon was acutally removed.
0 is returned otherwise. """
whichPolygon = insideWhichPolygon(self.polygonsX, self.polygonsY,
self.polygonBeginningsIndex,
self.polygonNumberOfItems, x, y)
# No polygon to delete, so do nothing
if whichPolygon == -1:
return 0
index = self.polygonBeginningsIndex[whichPolygon]
numberOfItems = self.polygonNumberOfItems[whichPolygon]
oldSize = self.polygonsX.shape[0]
newSize = oldSize - numberOfItems
newPolygonsX = Numeric.zeros((newSize, ), Numeric.Float)
newPolygonsY = Numeric.zeros((newSize, ), Numeric.Float)
# remove the offending polygon
newPolygonsX[0:index] = self.polygonsX[0:index]
newPolygonsX[index:] = self.polygonsX[index + numberOfItems:]
newPolygonsY[0:index] = self.polygonsY[0:index]
newPolygonsY[index:] = self.polygonsY[index + numberOfItems:]
oldNumberOfPolygons = self.polygonNumberOfItems.shape[0]
newNumberOfPolygons = oldNumberOfPolygons - 1
newPolygonBeginningsIndex = Numeric.zeros((newNumberOfPolygons, ),
Numeric.Int)
newPolygonNumberOfItems = Numeric.zeros((newNumberOfPolygons, ),
Numeric.Int)
newPolygonBeginningsIndex[0:whichPolygon] = \
self.polygonBeginningsIndex[0:whichPolygon]
# note that the indicies of the items after the offending
# polygon need to be modified to affect the new array
newPolygonBeginningsIndex[whichPolygon:] = \
(self.polygonBeginningsIndex[whichPolygon+1:]-numberOfItems)
newPolygonNumberOfItems[0:whichPolygon] = \
self.polygonNumberOfItems[0:whichPolygon]
newPolygonNumberOfItems[whichPolygon:] = \
self.polygonNumberOfItems[whichPolygon+1:]
self.polygonsX = newPolygonsX
self.polygonsY = newPolygonsY
self.polygonBeginningsIndex = newPolygonBeginningsIndex
self.polygonNumberOfItems = newPolygonNumberOfItems
return 1
def removePolygon(self,x,y):
""" Removes the polygon that fills the coordinate x, y
If there are multiple polygons, the polygon with
the lowest index (first polygon in the list) is
returned. Returns 1 if a polygon was acutally removed.
0 is returned otherwise. """
whichPolygon = insideWhichPolygon(self.polygonsX,self.polygonsY,
self.polygonBeginningsIndex,self.polygonNumberOfItems,x,y)
# No polygon to delete, so do nothing
if whichPolygon == -1:
return 0
index = self.polygonBeginningsIndex[whichPolygon]
numberOfItems = self.polygonNumberOfItems[whichPolygon]
oldSize = self.polygonsX.shape[0]
newSize = oldSize - numberOfItems
newPolygonsX = Numeric.zeros( (newSize,) ,Numeric.Float)
newPolygonsY = Numeric.zeros( (newSize,) ,Numeric.Float)
# remove the offending polygon
newPolygonsX[0:index] = self.polygonsX[0:index]
newPolygonsX[index:] = self.polygonsX[index+numberOfItems:]
newPolygonsY[0:index] = self.polygonsY[0:index]
newPolygonsY[index:] = self.polygonsY[index+numberOfItems:]
oldNumberOfPolygons = self.polygonNumberOfItems.shape[0]
newNumberOfPolygons = oldNumberOfPolygons-1
newPolygonBeginningsIndex = Numeric.zeros( (newNumberOfPolygons,) ,Numeric.Int)
newPolygonNumberOfItems = Numeric.zeros( (newNumberOfPolygons,) ,Numeric.Int)
newPolygonBeginningsIndex[0:whichPolygon] = \
self.polygonBeginningsIndex[0:whichPolygon]
# note that the indicies of the items after the offending
# polygon need to be modified to affect the new array
newPolygonBeginningsIndex[whichPolygon:] = \
(self.polygonBeginningsIndex[whichPolygon+1:]-numberOfItems)
newPolygonNumberOfItems[0:whichPolygon] = \
self.polygonNumberOfItems[0:whichPolygon]
newPolygonNumberOfItems[whichPolygon:] = \
self.polygonNumberOfItems[whichPolygon+1:]
self.polygonsX = newPolygonsX
self.polygonsY = newPolygonsY
self.polygonBeginningsIndex = newPolygonBeginningsIndex
self.polygonNumberOfItems = newPolygonNumberOfItems
return 1