Hans wrote:

want to create a grafik w PIL and store into my instance which is subclassed from OFS.Image.Image.

Here is an example that works. The only caveat I found was that you must use the same id for the images id in the objectmanager and as the id in the image. Well this is perhaps logical, but it bit me once. so that is like: imageID = 'myImage' self._setObject(imageID, OFS.Image.Image(imageID,'Laerings graf','')) Then it can be called like: <dtml-var myImage> regards Max M def _drawTriangle(self, a, b, c): im = PIL.Image.open("C:/root/pythonScripts/PILTest/laeringstilGraf_2.gif") """ Coordinate system: d | a -------- c | b """ # a is a sequence of 4 values. maxValue = max(a) # what value is it biggestIndex = a.index(maxValue) # Where is it? if biggestIndex == 0: # Then draw in a dirX, dirY = 1,1 bX, bY = 200, 300 cX, cY = 300, 200 elif biggestIndex == 1: # Then draw in b dirX, dirY = 1,0 bX, bY = 200, 100 cX, cY = 300, 200 elif biggestIndex == 2: # Then draw in c dirX, dirY = 0,0 bX, bY = 200, 100 cX, cY = 100, 200 elif biggestIndex == 3: # then draw in d dirX, dirY = 0,1 bX, bY = 200, 300 cX, cY = 100, 200 tr1 = transformer(200, 200, 4, dirX, dirY) sideLength = sqrt(pow(maxValue,2)/2.0) # Pythagoras cord1 = tr1.transform(sideLength, sideLength) tr2 = transformer(bX, bY, 6, dirX, dirY) coord2 = tr2.transform(0,b) tr3 = transformer(cX, cY, 1, dirX, dirY) coord3 = tr3.transform(c,0) draw = PIL.ImageDraw.Draw(im) darkBlue = 2 draw.polygon([cord1, coord2, coord3], outline=darkBlue, fill=darkBlue) del draw outf = StringIO() im.save(outf, 'GIF') # Save it to a temp file del im data = outf.getvalue() outf.close() return data def updateGraph(self): "Updates the graph if it is changed since last view" #self.imageLastChanged = 0 imageID = 'laeringsGraf' if self.imageLastChanged == self.lastChanged: # Image is in sync pass else: # doesn't exist, so render it # all stuff happens in the next line #data = self._drawTriangle([60, 0, 0, 0], 11, 60) data = self._drawTriangle(self._getQ1Result(), self._getQ2Result(), self._getQ3Result()) if not hasattr(self, imageID): # add to objectmanager self._setObject(imageID, OFS.Image.Image(imageID,'Laerings graf','')) self._getOb(imageID).update_data(data) self.imageLastChanged = self.lastChanged