from pyx import * c = canvas.canvas() p = path.line(0, 0, 2, 2) p.append(path.curveto(2, 0, 3, 0, 4, 0)) c.stroke(p) c.stroke(p, [deformer.parallel(0.2), color.rgb.blue]) c.stroke(p, [deformer.parallel(-0.2), color.rgb.red]) c.writeEPSfile("parallel") c.writePDFfile("parallel")