碰撞检测简单游戏-Pygame

Question

在海盗船和块碰撞时试图调用崩溃功能，但是由于某种原因，该块将登录屏幕并调用崩溃功能。当他们碰撞时，游戏确实结束了，但是当块撞到屏幕的某些部分时，游戏将随机结束。

import pygame
import time
from pygame.locals import * #all the imports I use
import random
pygame.init() # initialise pygame
display_width = 1500
display_height = 700
black = (0,0,0)
white = (255,255,255)
red = (255,0,0)

gameDisplay = pygame.display.set_mode((display_width,display_height)) #creates the window
pygame.display.set_caption('A bit Shipy')
clock = pygame.time.Clock()
shipIMG = pygame.image.load('ship.png')
ship_width = 50
ship_height = 50 # in pixels
def things_dodged(count):
    font = pygame.font.SysFont(None, 25)
    text = font.render("Dodged: "+str(count), True, black)
    gameDisplay.blit(text, (0,0))
def things(thingx, thingy, thingw, thingh, color): #the scrolling object
    pygame.draw.rect(gameDisplay, color, [thingx, thingy, thingw, thingh])
def ship(x,y): #ship function
    gameDisplay.blit(shipIMG,(x,y))

def text_objects(text, font):
    textSurface = font.render(text, True, red) #game over text
    return textSurface, textSurface.get_rect()

def message_display(text):
    largeText = pygame.font.Font('freesansbold.ttf',200)
    TextSurf, TextRect = text_objects(text, largeText)
    TextRect.center = ((display_width/2),(display_height/2)) #creates the text 
    gameDisplay.blit(TextSurf, TextRect)
    pygame.display.update()
    time.sleep(2) #Game over text lasts two seconds
    game_loop() #runs the game again afterwards
def crash():
    message_display('You Sunk!') #when the player goes off screen or hits an object


#x = (display_width * 0.45)
#y = (display_height * 0.8)
def game_loop(): #the main game loop
    x = (display_width * 0.45)
    y = (display_height * 0.8)
    x_change = 0
    y_change = 0
    thing_startx = display_width
    thing_starty = random.randrange(0, display_height)  #enemy object
    thing_speed = 7
    thing_width = 50
    thing_height = 50
    dodged = 0

    gameExit = False
    while not gameExit:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                gameExit = True
            if event.type == pygame.KEYDOWN:
                if event.key == pygame.K_LEFT:
                    x_change = -5
                elif event.key == pygame.K_RIGHT:
                    x_change = 5
            if event.type == pygame.KEYUP:
                if event.key == pygame.K_LEFT or event.key == pygame.K_RIGHT: #changes x or y dependant on key pressed
                    x_change = 0
            if event.type == pygame.KEYDOWN:
                if event.key == pygame.K_UP:
                    y_change = -5
                elif event.key == pygame.K_DOWN:
                    y_change = 5
            if event.type == pygame.KEYUP:
                if event.key == pygame.K_UP or event.key == pygame.K_DOWN:
                    y_change = 0
        x += x_change
        y += y_change

        gameDisplay.fill((0,0,155)) #blue background 

        things(thing_startx, thing_starty, thing_width, thing_height, black) #calls the thing function 
        thing_startx -= thing_speed #moves the block left 
        ship(x,y)
        things_dodged(dodged)

        if x > display_width - ship_width or y > display_height-ship_height or x < 0 or y < 0:
             crash()
        if thing_startx < 0:
            thing_startx = display_width
            thing_starty = random.randrange(0, display_height)
            dodged = dodged + 1
        #here is where the collision detection starts:    
        if x < thing_startx+thing_width:
            print(' y crossover 1')
            if y >= thing_starty and y < thing_starty + thing_height or y+ship_height > thing_starty and y + ship_height < thing_starty +thing_height:
                print (' x crossover 2')
                crash()
        pygame.display.update()
        clock.tick(200)

game_loop()
pygame.quit()
quit()

Answer 1

看起来您与屏幕的碰撞测试不正确。这是一个替代版本。

    #if x > display_width - ship_width or y > display_height - ship_height or x < 0 or y < 0:
    if (x + ship_width/2 > display_width or    # right edge
        x - ship_width/2 < 0 or                # left edge
        y + ship_height/2 > display_height or  # top
        y - ship_width/2 < 0):                 # bottom
        crash()

您应该考虑将船作为对象（类）引入。

您与x轴上对象的碰撞检测仅在检查船的块是否留在船上：

    #here is where the collision detection starts:
    if (x  > thing_startx - thing_width/2 and
        x  < thing_startx  + thing_width/2):
        print(' y crossover 1')

也许您应该使用内置精灵代表船和街区：Sprite

它们是对象，并且具有检测与其他精灵碰撞的功能：Collide_Rect_Rect