This little program uses Python and it's module pygame to do some sprite type animation. The rectangle that contains the image is moved and bounced within the window's frame. Pretty crude, since the whole screen frame is erased for each move. Actually it works smooth enough, and is relatively flicker free. You could improve the code by keeping track of the image's rectangle, refreshing and updating just it.
# experiments with module pygame # free from: http://www.pygame.org/ # move a rectangle with an image in it # if you have the image of a ball, you have a bouncing ball # tested with Python24 and Pygame171 vegaseat 02feb2007 import pygame as pg # initialize pygame pg.init() # download the image from: # http://www.daniweb.com/techtalkforums/post310029-97.html # or use an image you have (.bmp .jpg .png .gif) # ideally the image should have a black background or # you have to fill the screen with the matching background image_file = "ball_r.gif" # image moves [x, y] at a time # you can change trajectory, speed and direction im_dir = [2, 1] # RGB color tuple for screen background black = (0,0,0) # screen width and height sw = 640 sh = 480 # create a screen screen = pg.display.set_mode((sw, sh)) # give the screen a title pg.display.set_caption('bouncing image (press escape to exit)') try: # load an image # convert() unifies the pixel format for faster blit image = pg.image.load(image_file).convert() except: print "Please supply image file %s" % image_file raise SystemExit # get the rectangle the image occupies im_rect = image.get_rect() # the event loop also loops the animation code while True: pg.event.pump() keyinput = pg.key.get_pressed() # exit on corner 'x' click or escape key press if keyinput[pg.K_ESCAPE] or pg.event.peek(pg.QUIT): raise SystemExit # set the move im_rect = im_rect.move(im_dir) # detect the boundaries and change directions # left/right boundaries are 0 to sreen width if im_rect.left < 0 or im_rect.right > sw: im_dir = -im_dir # top/bottom boundaries are 0 to screen height if im_rect.top < 0 or im_rect.bottom > sh: im_dir = -im_dir # this erases the old sreen with black screen.fill(black) # put the image on the screen screen.blit(image, im_rect) # update screen pg.display.flip()
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