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'''
A really quick and dirty hack to extend PixMapWrapper
They are mere copies of the toImage and fromImage methods.
Riccardo Trocca (rtrocca@libero.it)
'''
from PixMapWrapper import *
import Numeric
class ExtPixMapWrapper(PixMapWrapper):
def toNumeric(self):
data = self.tostring()[1:] + chr(0)
bounds = self.bounds
tmp=Numeric.fromstring(data,Numeric.UnsignedInt8)
#tmp.shape=(bounds[3]-bounds[1],bounds[2]-bounds[0],4)
tmp.shape=(bounds[2]-bounds[0],bounds[3]-bounds[1],4)
return Numeric.transpose(tmp,(1,0,2))
def fromNumeric(self,num):
s=num.shape
x=num.shape[1]
y=num.shape[0]
#bands=1 Greyscale image
#bands=3 RGB image
#bands=4 RGBA image
if len(s)==2:
bands=1
num=Numeric.resize(num,(y,x,1))
else:
bands=num.shape[2]
if bands==1:
num=Numeric.concatenate((num,num,num),2)
bands=3
if bands==3:
alpha=Numeric.ones((y,x))*255
alpha.shape=(y,x,1)
num=Numeric.concatenate((num,alpha),2)
data=chr(0)+Numeric.transpose(num,(1,0,2)).astype(Numeric.UnsignedInt8).tostring()
PixMapWrapper.fromstring(self,data,x,y)
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