让移动更真实

问题描述

我编写此代码是为了让一个圆圈跟随我的鼠标，但运动真的很机械，并没有提供我想要的 360 度运动。

代码如下：

mx,my = pygame.mouse.get_pos()

for event in pygame.event.get():
    if event.type == pygame.QUIT:
        Running = False

mpos = (mx,my)
X = (playerX)
Y = (playerY)


if mpos[1] >= Y: 
    playerY += vel


if mpos[1] <= Y:
    playerY -= vel

    
if mpos[0] <= X:
    playerX -= vel

if mpos[0] >= X:
    playerX += vel

解决方法

您需要计算方向 vector，对其进行标准化并将其乘以所需的速度，然后将其应用于圆圈位置。

最简单的方法是使用 pygame 的内置 Vector2 类：

import pygame

def main():
    pygame.init()
    screen = pygame.display.set_mode((600,600))
    pos = pygame.Vector2()
    clock = pygame.time.Clock()
    speed = 10
    while True:
        
        for e in pygame.event.get():
            if e.type == pygame.QUIT:
                return 
                
        movement = pygame.mouse.get_pos() - pos 
        if movement.length() > 6: # some margin so we don't flicker between two coordinates
            if movement.length() > 0: # when we move,we want to move at a constant speed
                movement.normalize_ip()
            pos += movement * speed # change the position
    
        screen.fill((20,20,20))
        pygame.draw.circle(screen,'dodgerblue',pos,30)
        pygame.display.flip()
        clock.tick(30)
        
main()

pygame python