Subj : fill in a segment of a circle on a graph
To   : comp.programming
From : aiiadict
Date : Sun Sep 04 2005 09:21 pm

hi,

segment of circle = 45degree (constant) "pie slice"
radius of circle = variable, and known
angle = variable and known  (this the angle of line running through
center of the pie slice, the slice extending 22.5 degrees to each side
of this line)


goal:

0,0 on a graph is the center of the circle

input:

1)angle = 0 degrees for example, compass direction North
2)radius (30, for example)

what coordinates would be included in this slice?

I want the coordinates of all cells outlined by the circle segment.

I could draw the arc, and the edges of the slice, and then use
some sort of fill routine.  I thought perhaps someone here would
know a neat algorithm.

Bresenhams algorithm looks like it would work, but I haven't
figured out the code yet.  Trying to get it to do any segment
of an arc is taking me a while to figure out.

Rich

.