Python精灵模块的pmouse_pos指令

from sprites import *

bug = Sprite()

while True:
    pmx,pmy = pmouse_pos() # 获取先前鼠标指针
    mx,my = mouse_pos()    # 获取鼠标指针
    bug.heading((mx,my))
    if bug.distance(mx,my)>50:
        bug.fd(1)
    print(mx-pmx,my-pmy)
    bug.update()