def readXML(ifile):
"""
Read a list of Polygons from a XML file which was written with writeXML().
:Arguments:
- ofile: see above
:Returns:
list of Polygon objects
"""
f, cl = getReadableObject(ifile)
d = parseString(f.read())
if cl: f.close()
plist = []
for pn in d.getElementsByTagName('polygon'):
p = Polygon()
plist.append(p)
for sn in pn.childNodes:
if not sn.nodeType == Node.ELEMENT_NODE:
continue
assert sn.tagName == 'contour'
polist = []
for pon in sn.childNodes:
if not pon.nodeType == Node.ELEMENT_NODE:
continue
polist.append((float(pon.getAttribute('x')), float(pon.getAttribute('y'))))
assert int(sn.getAttribute('points')) == len(polist)
p.addContour(polist, int(sn.getAttribute('isHole')))
assert int(pn.getAttribute('contours')) == len(p)
return plist
def prunePoints(poly):
"""
Returns a new Polygon which has exactly the same shape as p, but unneeded
points are removed. The new Polygon has no double points or points that are
exactly on a straight line.
:Arguments:
- p: Polygon
:Returns:
new Polygon
"""
np = Polygon()
for x in range(len(poly)): # loop over contours
c = list(poly[x])
c.insert(0, c[-1])
c.append(c[1])
# remove double points
i = 1
while (i < (len(c))):
if c[i] == c[i-1]:
del c[i]
else:
i += 1
# remove points that are on a straight line
n = []
for i in range(1, len(c)-1):
if __linVal(c[i-1:i+2]) != 0.0:
n.append(c[i])
if len(n) > 2:
np.addContour(n, poly.isHole(x))
return np
def readXML(ifile):
"""
Read a list of Polygons from a XML file which was written with writeXML().
:Arguments:
- ofile: see above
:Returns:
list of Polygon objects
"""
f, cl = getReadableObject(ifile)
d = parseString(f.read())
if cl: f.close()
plist = []
for pn in d.getElementsByTagName('polygon'):
p = Polygon()
plist.append(p)
for sn in pn.childNodes:
if not sn.nodeType == Node.ELEMENT_NODE:
continue
assert sn.tagName == 'contour'
polist = []
for pon in sn.childNodes:
if not pon.nodeType == Node.ELEMENT_NODE:
continue
polist.append((float(pon.getAttribute('x')),
float(pon.getAttribute('y'))))
assert int(sn.getAttribute('points')) == len(polist)
p.addContour(polist, int(sn.getAttribute('isHole')))
assert int(pn.getAttribute('contours')) == len(p)
return plist
def prunePoints(poly):
"""
Returns a new Polygon which has exactly the same shape as p, but unneeded
points are removed. The new Polygon has no double points or points that are
exactly on a straight line.
:Arguments:
- p: Polygon
:Returns:
new Polygon
"""
np = Polygon()
for x in range(len(poly)): # loop over contours
c = list(poly[x])
c.insert(0, c[-1])
c.append(c[1])
# remove double points
i = 1
while (i < (len(c))):
if c[i] == c[i-1]:
del c[i]
else:
i += 1
# remove points that are on a straight line
n = []
for i in range(1, len(c)-1):
if __linVal(c[i-1:i+2]) != 0.0:
n.append(c[i])
if len(n) > 2:
np.addContour(n, poly.isHole(x))
return np
def fillHoles(poly):
"""
Returns the polygon p without any holes.
:Arguments:
- p: Polygon
:Returns:
new Polygon
"""
n = Polygon()
[n.addContour(poly[i]) for i in range(len(poly)) if poly.isSolid(i)]
return n
def fillHoles(poly):
"""
Returns the polygon p without any holes.
:Arguments:
- p: Polygon
:Returns:
new Polygon
"""
n = Polygon()
[n.addContour(poly[i]) for i in range(len(poly)) if poly.isSolid(i)]
return n
def decodeBinary(bin):
"""
Create Polygon from a binary string created with encodeBinary(). If the string
is not valid, the whole thing may break!
:Arguments:
- s: string
:Returns:
new Polygon
"""
nC, b = __unpack('!I', bin)
p = Polygon()
for i in range(nC[0]):
x, b = __unpack('!l', b)
if x[0] < 0:
isHole = 1
s = -2*x[0]
else:
isHole = 0
s = 2*x[0]
flat, b = __unpack('!%dd' % s, b)
p.addContour(tuple(__couples(flat)), isHole)
return p
def decodeBinary(bin):
"""
Create Polygon from a binary string created with encodeBinary(). If the string
is not valid, the whole thing may break!
:Arguments:
- s: string
:Returns:
new Polygon
"""
nC, b = __unpack('!I', bin)
p = Polygon()
for i in range(nC[0]):
x, b = __unpack('!l', b)
if x[0] < 0:
isHole = 1
s = -2 * x[0]
else:
isHole = 0
s = 2 * x[0]
flat, b = __unpack('!%dd' % s, b)
p.addContour(tuple(__couples(flat)), isHole)
return p
