如何让物体自行移动？

Question

对于我的模拟，我试图让我需要的形状具有重力效果。换句话说，当我点击按钮创建一个新形状时，我如何让它自己掉下来？任何帮助，将不胜感激。注意：我现在只是试图让圆圈工作，所以其他形状的代码落后了。我还需要完成碰撞检测，这就是为什么那里有一些随机的东西。main.py:import pygameimport timefrom shapes import *from inv import *pygame.init()width, height = (1000, 800)screen = pygame.display.set_mode((width, height))pygame.display.set_caption("Physics Game")bgc = (223, 255, 252)screen.fill(bgc)# Inv Button Variablesiwidth = 100iheight = 100# Inventory Classesicir = InvCir(10, 10, iwidth, iheight)irect = InvRect(15 + iwidth, 10, iwidth, iheight)itri = InvTri(20 + (iwidth * 2), 10, iwidth, iheight)# Object Classescir = Circle(40, (97, 160, 255), 500, 300)rect = Rect(300, 300, 80, 80)# Shape ListscirList = []rectList = []def main():    run = True    FPS = 60    clock = pygame.time.Clock()    def updateScreen():        icir.draw(screen, (0, 0, 0))        irect.draw(screen, (0, 0, 0))        itri.draw(screen, (0, 0, 0))        pygame.display.update()    def addList(list, shape):        list.append(shape)        print(list)    while run:        clock.tick(FPS)        mpos = pygame.mouse.get_pos()        for event in pygame.event.get():            if event.type == pygame.QUIT:                run = False            if event.type == pygame.MOUSEBUTTONDOWN:                if icir.checkClick(mpos):                    cir.itemDraw(screen)                    addList(cirList, cir)            if event.type == pygame.MOUSEBUTTONDOWN:                if irect.checkClick(mpos):                    rect.itemDraw(screen)                    addList(rectList, rect)        if pygame.mouse.get_pressed()[0]:                pass                updateScreen()main()

Answer 1

弹跳球的技巧是增加重力。重力总是加速 Y（垂直）速度朝向地板。

• 当球下落时，速度增加

• 随着球上升，速度下降

当球撞击地面时，速度反转并且球“弹跳”。当球速在顶部达到零时，重力会反转速度并将球拉向地面。

这是一个弹跳球的简单示例：

import pygame as pg

from time import sleep, time

pg.init()

Height = Width = 500  # window dimensions

pg.display.set_caption("Bounce") # window title

win = pg.display.set_mode((Height, Width)) # create window

ball = {'x':Width/2, 'y':100, 'xs':3, 'ys':3 } # ball start position and speed

radius = 20  # ball radius

while True:   # main loop

   for event in pg.event.get(): # required for OS events

      if event.type == pg.QUIT:

         pg.quit()

         

   pg.time.Clock().tick(30)  # 30 FPS

   win.fill((255, 255, 255))  # clear screen

   pg.draw.circle(win, (200, 0, 0), (int(ball['x']), int(ball['y'])), 20) # draw ball

   ball['x'] += ball['xs'] # move ball left \ right

   ball['y'] += ball['ys'] # move ball up \ down

   if ball['y'] >= Height - radius: ball['ys'] = -ball['ys']  # bounce on floor

   else: ball['ys'] += .2   # accelerate toward floor, increase speed down, decrease up

   if ball['x'] <= radius or ball['x'] > Width - radius: ball['xs'] = -ball['xs']  # bounce on wall

   pg.display.update()