PIT绘制椭圆代码

介绍

代码

import numpy as np
from PIL import Image
 
array = np.ndarray((660, 660, 3), np.uint8)
array[:, :, 0] = 255
array[:, :, 1] = 255
array[:, :, 2] = 255
 
for i in range(0,660,1):
  array[i,330]=(0,0,0)
for j in range(0,660,1):
  array[330,j]=(0,0,0)
  
def draw(x,y):
  array[x+330,y+330]=(255,0,0)
  array[x+330,330-y]=(255,0,0)
  array[330-x,330-y]=(255,0,0)
  array[330-x,y+330]=(255,0,0)

def MidpointEllipse(a,b):
  x=0
  y=b
  d1=b*b+a*a*(-b+0.25)
  draw(x,y)
  while(b*b*(x+1)<a*a*(y-0.5)):
    if(d1<0):
      d1+=b*b*(2*x+3)
    else:
      d1+=(b*b*(2*x+3)+a*a*(-2*y+2))
      y-=1
    x += 1
    draw(x,y)
  d2=b*b*(x+0.5)*(x+0.5)+a*a*(y-1)*(y-1)-a*a*b*b
  while(y>0):
    if(d2<0):
      d2+=b*b*(2*x+2)+a*a*(-2*y+3)
      x+=1
      y-=1
    else:
      d2+=a*a*(-2*y+3)
      y-=1
    draw(x,y)

def main():
  MidpointEllipse(100, 150) 
  image = Image.fromarray(array)
  image.show() 

if __name__ == "__main__":
  main()