python – 软件设计与开发专业：Pygame Smudge Trails

首先,我在网上搜索了这个网站的解决方案和我尝试过的那些都没有用,所以我决定发布我的个人问题和代码.该程序是使用Python 3.2.2和pygame的相应兼容版本创建的.我还意识到一个更有效的方法是使用精灵,精灵组和’脏矩形’更新,但我无法转换程序,所以我将继续没有这些功能的额外好处.

问题：“小行星”移动的污迹落后.
假设：背景在屏幕上显示,但小行星在背景上显示.

请回复 – 顺便说一句,我是AUS的高中生：D

import pygame
import random
import math
pygame.init()

height = 550
width = 750
screen = pygame.display.set_mode((width,height))
background = pygame.image.load("Planet.jpg")
Clock = pygame.time.Clock()


class asteroid(pygame.sprite.Sprite):
    def __init__(self,x,y,size):
        pygame.sprite.Sprite.__init__(self)
        self.x = x
        self.y = y
        self.size = 15
        self.speed = 0.0
        self.angle = 0
        self.colour = (171,130,255)
        self.thickness = 0

def display(self):
     pygame.draw.circle(background,self.colour,(int(self.x),int(self.y)),self.size,self.thickness)

     pygame.draw.circle(background,(255,255,255),1)

def move(self):
    self.x += math.sin(self.angle) * self.speed
    self.y -= math.cos(self.angle) * self.speed

def boundaries(self):
    if self.x > width - self.size:
        self.x = 0 + self.size
    elif self.x < self.size:
        self.x = width - self.size
    if self.y > height - self.size:
        self.y = 0 + self.size
    elif self.y display.set_caption("Anyu's Game")
    screen.blit(background,(0,0))
    pygame.display.update()
    score = (pygame.time.get_ticks()/1000)
    print (score)


while True:
    pygame.display.update()
    screen.blit(background,0))
    MouseP = pygame.mouse.get_pos()
    frames = Clock.get_fps
    pygame.mouse.set_visible
    score = (pygame.time.get_ticks()/1000)
    print (score)
    print (MouseP)
    for target in my_particles:
        target.move()
        target.boundaries()
        target.display()
        pygame.display.update()


    for event in pygame.event.get():

        if event.type == pygame.QUIT:
            pygame.quit();

if __name__=='__main__':
    main()

最佳答案

基本上,你是对的！圆圈直接绘制在背景上,每次绘制新圆圈时,旧圆圈都会保留.造成污迹/痕迹.

您可以在绘图方法中将背景更改为屏幕.这将解决它.

但是真的值得使用Sprite类.我对您的代码进行了一些更改,以便为您切换.通过这些更改,它运行没有路径:)

以下是变化和解释：

在顶部附近添加：

#Create a new `pygame.Surface`,and draw a circle on it,then set transparency:
circle = pygame.Surface((30,30))
circle = circle.convert()
pygame.draw.circle(circle,(171,(int(15),int(15)),15,0)
circle.set_colorkey(circle.get_at((0,0)),pygame.RLEACCEL)

将其添加到小行星__init__方法：

#Sets the asteroid image,and then the asteroids co-ords (these are in `rect`)
        self.image = circle
        self.rect = self.image.get_rect()

将其添加到def move(self)的末尾：

        self.rect[0] = self.x
        self.rect[1] = self.y

更改：

my_particles = []

至：

#This is a special pygame container class,it has a draw() method that tracks changed areas of the screen.
my_particles = pygame.sprite.RenderUpdates()

更改：

my_particles.append(target)

至：

my_particles.add(target)

更改：

while True:
    pygame.display.update()
    screen.blit(background,0))
    MouseP = pygame.mouse.get_pos()
    frames = Clock.get_fps
    pygame.mouse.set_visible
    score = (pygame.time.get_ticks()/1000)
    print (score)
    print (MouseP)
    for target in my_particles:
        target.move()
        target.boundaries()
        target.display()
        pygame.display.update()

至：

#initial screen draw:
screen.blit(background,0))
pygame.display.update()
while True:
    #remove prevIoUs drawn sprites and replaces with background:
    my_particles.clear(screen,background)
    MouseP = pygame.mouse.get_pos()
    frames = Clock.get_fps
    pygame.mouse.set_visible
    score = (pygame.time.get_ticks()/1000)
    print (score)
    print (MouseP)
    for target in my_particles:
        target.move()
        target.boundaries()
    #draws changed sprites to the screen:
    pygame.display.update(my_particles.draw(screen))

删除不再需要的显示方法.

这也比你早期的代码运行得快得多,因为绘制内容所花费的时间与绘图区域的大小成正比,之前它每次都绘制整个背景 – 现在它只绘制精灵并更改为背景！

希望这可以帮助：)

blit

python – 软件设计与开发专业：Pygame Smudge Trails

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