def scaleContour(pol, scale): # Scale up the polygon relative to its center cx = 0 cy = 0 for i in range(pol.npoints): cx += pol.xpoints[i] cy += pol.ypoints[i] cx /= pol.npoints cy /= pol.npoints aff = AffineTransform(1, 0, 0, 1, -cx, -cy) aff.preConcatenate(AffineTransform(scale, 0, 0, scale, 0, 0)) aff.preConcatenate(AffineTransform(1, 0, 0, 1, cx, cy)) tmp = Area(pol) tmp.transform(aff) return M.getPolygons(tmp)[0]
