Pygame 中實現跳躍
在本文中,你將學習如何在 Pygame 中實現跳躍的邏輯。
移動
左右移動類似於以前的教程,只是意味著改變玩家的 (X,Y)
的位置。對於跳躍,我們使用經典力學的公式:
F = 1/2 * m * v^2
其中 F
是方向上/下的力,m
是物體的質量,v
是速度。速度隨著時間的推移而下降,因為當玩家跳躍時,速度在此模擬中不會增加更多。如果玩家到達地面,則跳躍結束。在 Python 中,我們設定一個變數 isjump
來顯示玩家是否跳躍。如果是玩家,其位置將根據上述公式進行更新。
完整程式碼:
from pygame.locals import *
import pygame
import math
from time import sleep
class Player:
x = 10
y = 500
speed = 10
# Stores if player is jumping or not.
isjump = 0
# Force (v) up and mass m.
v = 8
m = 2
def moveRight(self):
self.x = self.x + self.speed
def moveLeft(self):
self.x = self.x - self.speed
def jump(self):
self.isjump = 1
def update(self):
if self.isjump:
# Calculate force (F). F = 0.5 * mass * velocity^2.
if self.v > 0:
F = ( 0.5 * self.m * (self.v*self.v) )
else:
F = -( 0.5 * self.m * (self.v*self.v) )
# Change position
self.y = self.y - F
# Change velocity
self.v = self.v - 1
# If ground is reached, reset variables.
if self.y >= 500:
self.y = 500
self.isjump = 0
self.v = 8
class App:
windowWidth = 800
windowHeight = 600
player = 0
def __init__(self):
self._running = True
self._display_surf = None
self._image_surf = None
self.player = Player()
def on_init(self):
pygame.init()
self._display_surf = pygame.display.set_mode((self.windowWidth,self.windowHeight), pygame.HWSURFACE)
pygame.display.set_caption('Pygame pythonspot.com example')
self._running = True
self._image_surf = pygame.image.load("pygame.png").convert()
def on_event(self, event):
if event.type == QUIT:
self._running = False
def on_loop(self):
pass
def on_render(self):
self._display_surf.fill((0,0,0))
self._display_surf.blit(self._image_surf,(self.player.x,self.player.y))
self.player.update()
pygame.display.flip()
sleep(0.03)
def on_cleanup(self):
pygame.quit()
def on_execute(self):
if self.on_init() == False:
self._running = False
while( self._running ):
pygame.event.pump()
keys = pygame.key.get_pressed()
if (keys[K_RIGHT]):
self.player.moveRight()
if (keys[K_LEFT]):
self.player.moveLeft()
if (keys[K_UP]):
self.player.jump()
if (keys[K_ESCAPE]):
self._running = False
self.on_loop()
self.on_render()
self.on_cleanup()
if __name__ == "__main__" :
theApp = App()
theApp.on_execute()
如果物件要跳躍,只需將它們新增到螢幕上,進行碰撞檢測並在碰撞為真時重置跳躍變數。