pygame是用来写2D游戏的。
实现斜线运动，无非是在x和y两个方向上分运动的合成。x方向上的运动，当撞到边界的时候取相反速度就好了。
这里是用网球王子中的图片，以及一个网球实现，效果截图：
注意看，那个方块形状的网球是会动的，撞到边界就反弹，时刻匀速（这情况太理想了。。。）
代码：
# coding:utf-8 bgimg = 'teni.jpg' spimg = 'ball.jpg'import pygame from pygame.locals import * from sys import exitpygame.init() screen = pygame.display.set_mode((640, 480), 0, 32)bg = pygame.image.load(bgimg).convert() sp = pygame.image.load(spimg).convert_alpha()clock = pygame.time.Clock()x, y =100., 100. speed_x, speed_y = 133., 170.while True:for event in pygame.event.get():if event.type == QUIT:exit()screen.blit(bg, (0, 0))screen.blit(sp, (x, y))time_passed = clock.tick(30) # 设定最大FPS不超过30# FPS：Frame per secondtime_passed_seconds = time_passed / 1000.0x += speed_x * time_passed_secondsy += speed_y * time_passed_secondsif x > 640 - sp.get_width():speed_x = -speed_xx = 640 - sp.get_width()elif x < 0:speed_x = - speed_xx = 0.if y > 480 - sp.get_height():speed_y = -speed_yy = 480 - sp.get_height()elif y < 0:speed_y = -speed_yy = 0pygame.display.update()
