I wrote the following code for a personal project. I need a function
that will plot a filled circle in a two dimensional array. I found
Bresenham's algorithm, and produced this code. Please tell me there's
a better way to do this.
import numpy
def circle(field=None,radius,center=(0,0),value=255,):
'''Returns a list of points within 'radius' distance from point
'center'.'''
if field==None:
field=numpy.zeros((radius,radius),'u')
cx,cy=center
filllist=[]
dy,dx=0,radius
r2=radius**2
while dy<=(radius*.71): # sin of 45 degrees
if dx**2+dy**2<=r2:
for x in range(dx):
filllist.append((x,dy))
dy+=1
else:
dx-=1
if dx<dy : break
resultlist=[]
for (i,j) in filllist:
field[cx+i][cy+j]=value
field[cx+j][cy+i]=value
field[cx-j][cy+i]=value
field[cx-i][cy+j]=value
field[cx-i][cy-j]=value
field[cx-j][cy-i]=value
field[cx+j][cy-i]=value
field[cx+i][cy-j]=value
return field
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