用 Python 写游戏 第一篇 课后习题答案

第一篇课后练习

这里我留下一个思考题, 我们平时操作游戏的时候, 不会一直不停的按键盘, 那样太累, 怎么样把上面的程序改成当我们按下方向键的时候, 圆一直移动呢?

这里给个提示, 你还需要实现 on_key_up
函数, 来获得我们松开键盘按键的信息.

答案

player_pos_x = 100
player_pos_y = 100

def draw():
    screen.clear()
    screen.draw.filled_circle((player_pos_x, player_pos_y), 3, (255, 255, 255))

up = False    
down = False
left = False
right = False

def on_key_down(key):
    global up,down, left,right
   
    if key == keys.UP:
        up = True
    elif key == keys.DOWN:
        down = True
    elif key == keys.LEFT:
        left = True
    elif key == keys.RIGHT:
        right = True        

def update():
    global up, down, left, right, player_pos_x, player_pos_y
    if up:
        player_pos_y = player_pos_y - 1
    if down:
        player_pos_y = player_pos_y + 1
    if left:
        player_pos_x = player_pos_x - 1
    if right:
        player_pos_x = player_pos_x + 1
        
def on_key_up(key):
    global down,up,left,right
    if key == keys.UP:
        up = False
    elif key == keys.DOWN:
        down = False
    elif key == keys.LEFT:
        left = False
    elif key == keys.RIGHT:
        right = False

该习题完成后, 我们就有了一个可以较自由操作的主角了, 期待接下来的课程吧.

分类:编程 

标签: 编程  pyzero