简单实现python画圆功能

本文实例为大家分享了python实现画圆功能的具体代码，供大家参考，具体内容如下

import numpy as np
import matplotlib.pyplot as plt
from matplotlib.patches import Polygon
import matplotlib.patches as mpatches 

fig = plt.figure(figsize = (16,8))
ax = fig.gca()
ax.set_xlim(-5,18)
ax.set_ylim(-5,8)
alpha = np.linspace(-np.pi,np.pi,30)
t = np.linspace(-np.pi,np.pi,100)
def ppp(nc , na , c , sx , sy):
 beta = alpha[na]
 gam = alpha[na+1]
 x = [] ; y = [] ;
 r = 0.5*nc
 x.append(r*np.cos(beta)) ; y.append(r*np.sin(beta)) ;
 tt = np.linspace(beta,gam,10)
 for i in range(len(tt)):
  x.append(r*np.cos(tt[i]))
  y.append(r*np.sin(tt[i]))
 r-=0.5
 x.append(r*np.cos(gam)) ; y.append(r*np.sin(gam))
 tt = np.linspace(gam,beta,10)
 for i in range(len(tt)):
  x.append(r*np.cos(tt[i])) ; y.append(r*np.sin(tt[i]))
 x = np.array(x) ; y = np.array(y)
 verts = list(zip(x+sx,y+sy))
 poly = Polygon(verts , facecolor=c , edgecolor=c)
 ax.add_patch(poly) 

#ppp(2,0,'r',0,0)
def get_coordiate(x , y):
 beta = (alpha[y]+alpha[y+1])/2
 pr = 0.5*(x+x-1)/2
 sx = pr*np.cos(beta) ; sy = pr*np.sin(beta)
 return sx,sy
def pp_arrow(x,y):
 print x , y
 sx , sy = get_coordiate(x, y)
 for i in range(-1,2):
  for j in range(-1,2):
   if i == 0 and j == 0:
    continue
   ex , ey = get_coordiate(x+i, y+j)
   ax.arrow(sx,sy,ex-sx,ey-sy,head_width=0.05,head_length=0.1,fc='r',ec='r') 

def pxy(cx,cy):
 for i in range(10):
  plt.plot(0.5*i*np.cos(t)+cx,0.5*i*np.sin(t)+cy)
 for i in range(len(alpha)):
  plt.plot((0.5*np.cos(alpha)+cx,4.5*np.cos(alpha)+cx),(0.5*np.sin(alpha)+cy,4.5*np.sin(alpha)+cy)) 

cx = 13 ; cy =0
pxy(0,0)
pxy(13,0) 

mr = np.zeros((10,30))
mb = np.zeros((10,30)) 

for i in range(3,9):
 for j in range(1,27):
  ttt = np.random.random()
  if ttt >= 0.98 and ttt <= 1:
   ppp(i,j,'r',0,0)
   mr[i][j] = 1
   continue
  if ttt < 0.8:
   continue
  else:
   ppp(i,j,'b',0,0)
   mb[i][j] = 1 

for i in range(10):
 for j in range(30):
  if mr[i][j] == 0:
   continue
  pp_arrow(i, j)
  ma = 0 ;posx = 1 ; posy = 1
  for k in range(-1,2):
   for s in range(-1,2):
    mb[i+k][j+s]=0
    ttt = np.random.random()
    if ttt > ma:
     ma = ttt
     posx = k ; posy = s
  ppp(i+posx , j+posy , 'r' , 13 , 0)
  ppp(i,j,'g',13,0) 

for i in range(10):
 for j in range(30):
  if mb[i][j] == 0:
   continue
  ppp(i , j , 'b' , 13 , 0) 

arrow = mpatches.Arrow(5, 0
      ,3,0,width = 1,color = 'r')
ax.add_patch(arrow)
ax.text(6.2,0.5,'after one\nunit time',ha='center',va='center',color='y') 

xx = [4,4,4]
yy = [7.5,6.5,5.5]
c = ['b' , 'r' , 'g']
s = ['debris','satellite' , 'the location of satellite one unit time ago']
for i in range(3):
 print xx[i] , yy[i]
 rect = mpatches.Rectangle((xx[i],yy[i]),0.5,0.3,ec = c[i],fc=c[i] )
 ax.text(xx[i]+0.7,yy[i],s[i])
 ax.add_patch(rect)
plt.axis('off')
plt.show()

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