python通过PyGame绘制图像并保存为图片文件详解编程语言

''' pg_draw_circle_save101.py 
draw a blue solid circle on a white background 
save the drawing to an image file 
for result see http://prntscr.com/156wxi 
tested with Python 2.7 and PyGame 1.9.2 by vegaseat  16may2013 
''' 
  
import pygame as pg 
  
# pygame uses (r, g, b) color tuples 
white = (255, 255, 255) 
blue = (0, 0, 255) 
  
width = 300 
height = 300 
  
# create the display window 
win = pg.display.set_mode((width, height)) 
# optional title bar caption 
pg.display.set_caption("Pygame draw circle and save") 
# default background is black, so make it white 
win.fill(white) 
  
# draw a blue circle 
# center coordinates (x, y) 
center = (width//2, height//2) 
radius = min(center) 
# width of 0 (default) fills the circle 
# otherwise it is thickness of outline 
width = 0 
# draw.circle(Surface, color, pos, radius, width) 
pg.draw.circle(win, blue, center, radius, width) 
  
# now save the drawing 
# can save as .bmp .tga .png or .jpg 
fname = "circle_blue.png" 
pg.image.save(win, fname) 
print("file {} has been saved".format(fname)) 
  
# update the display window to show the drawing 
pg.display.flip() 
  
# event loop and exit conditions 
# (press escape key or click window title bar x to exit) 
while True: 
    for event in pg.event.get(): 
        if event.type == pg.QUIT: 
            # most reliable exit on x click 
            pg.quit() 
            raise SystemExit 
        elif event.type == pg.KEYDOWN: 
            # optional exit with escape key 
            if event.key == pg.K_ESCAPE: 
                pg.quit() 
                raise SystemExit