首页 > 解决方案 > 如何在pygame中让粒子跟随我的鼠标

问题描述

我试图确保单击鼠标时出现的粒子跟随鼠标。出于某种原因,粒子只是跟着我到左上角。谁能告诉我我做错了什么?

这是我的代码:

import pygame
import sys
import random
import math

from pygame.locals import *
pygame.init()

clock = pygame.time.Clock()
screen = pygame.display.set_mode((500,500))
particles = []
while True:
    screen.fill((0,0,0))
    for event in pygame.event.get():
        if event.type == MOUSEBUTTONDOWN:
            mx,my = pygame.mouse.get_pos()
            particles.append([[pygame.Rect(mx,my,10,10)]])
        if event.type == QUIT:
            pygame.quit()
            sys.exit()
        
    for particle in particles:
        mx,my = pygame.mouse.get_pos()
        pygame.draw.rect(screen,(255,255,255),particle[0][0])
        radians = math.atan2((particle[0][0].y - my),(particle[0][0].x -mx))
        dy1 = math.sin(radians)
        dx1 = math.cos(radians)
        particle[0][0].x -= dx1
        particle[0][0].y -= dy1
    
    pygame.display.update()
    clock.tick(60)

标签: pythonmathpygame

解决方案


问题是由于pygame.Rect存储整数值引起的。如果添加浮点值,则小数部分会丢失并且结果会被截断。round解决问题的结果坐标:

particle[0][0].x = round(particle[0][0].x - dx1)
particle[0][0].y = round(particle[0][0].y - dy1)

请注意,将对象附加到列表中就足够了pygame.Rect,而不是列表的列表pygame.Rect

particles.append([[pygame.Rect(mx,my,10,10)]])

particles.append(pygame.Rect(mx,my,10,10))

例子:

particles = []
while True:
    screen.fill((0,0,0))

    mx, my = pygame.mouse.get_pos()
    for event in pygame.event.get():
        if event.type == MOUSEBUTTONDOWN:
            particles.append(pygame.Rect(mx, my, 10, 10))
        if event.type == QUIT:
            pygame.quit()
            sys.exit()
        
    for particle in particles:
        pygame.draw.rect(screen, (255,255,255), particle)
        radians = math.atan2(my - particle.y, mx - particle.x)
        particle.x = round(particle.x + math.cos(radians))
        particle.y = round(particle.y + math.sin(radians))

有关更复杂的方法,请参阅如何在 pygame 中进行平滑移动


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