Is there anybody having a code snippet for using the Bresenham circle algo

and modifiying it in a way so that it actually draws arcs with specified

start and end angle instead of complete circles?

A Bresenham algo for a complete circle in Python would be like this:

```
import PIL.Image, PIL.ImageDraw
def circle(radius):
"Bresenham complete circle algorithm in Python"
# init vars
switch = 3 - (2 * radius)
points = set()
x = 0
y = radius
# first quarter/octant starts clockwise at 12 o'clock
while x <= y:
# first quarter first octant
points.add((x,-y))
# first quarter 2nd octant
points.add((y,-x))
# second quarter 3rd octant
points.add((y,x))
# second quarter 4.octant
points.add((x,y))
# third quarter 5.octant
points.add((-x,y))
# third quarter 6.octant
points.add((-y,x))
# fourth quarter 7.octant
points.add((-y,-x))
# fourth quarter 8.octant
points.add((-x,-y))
if switch < 0:
switch = switch + (4 * x) + 6
else:
switch = switch + (4 * (x - y)) + 10
y = y - 1
x = x + 1
return points
size = 100
radius = 40
circle_graph = PIL.Image.new("RGB", (size, size), (0,0,0))
draw = PIL.ImageDraw.Draw(circle_graph)
p = circle(radius)
# print the point coords
print p
for point in p:
draw.point((size/2+point[0],size/2+point[1]),(255,255,255))
circle_graph.show()
```