def spline(self, points):
p0 = points[0:2]
x1 = p0[0]
y1 = p0[1]
p1 = points[2:4]
c = p1[0]
d = p1[1]
x3 = (x1 + c) / 2.0
y3 = (y1 + d) / 2.0
self.stream += op.join(op.moveto(x1, y1), op.lineto(x3, y3))
for i in range(2, len(points) / 2):
point = points[i * 2], points[i * 2 + 1]
x1 = x3
y1 = y3
x2 = c
y2 = d
c = point[0]
d = point[1]
x3 = (x2 + c) / 2.0
y3 = (y2 + d) / 2.0
self.stream += op.curveto(x1, y1, x2, y2, x3, y3)
self.stream += op.stroke()
def line(self, x0, y0, x1, y1):
self.stream += op.join(op.moveto(x0, y0), op.lineto(x1, y1),
op.stroke())
def stroke(self):
self.stream += op.stroke()
def polyline(self, points):
self.stream += op.moveto(points[0], points[1])
for i in range(1, len(points) / 2):
point = points[i * 2], points[i * 2 + 1]
self.stream += op.lineto(*point)
self.stream += op.stroke()