Question

大家好，当我运行以下代码时，图像＆＃34; Car1.jpg＆＃34;从屏幕上快速放大然后因错误而崩溃：

追踪（最近一次通话）：文件＆＃34; C：\ Users \ Adam \ Desktop \ Indy 500 \ Indev V0 \ Indy 500.py＆＃34;，第72行，in Car1.update（的DeltaTime）文件＆＃34; C：\ Users \ Adam \ Desktop \ Indy 500 \ Indev V0 \ Indy 500.py＆＃34;，第45行，更新中 self.image = pygame.transform.rotate（self.image，self.direction） pygame.error：宽度或高度太大

#Necessary imports to make the game run.
import math
import os
import pygame
from pygame.locals import *
import random
import sys
import time

#This sets up the Display, Framerate and Caption.
pygame.init()
screen = pygame.display.set_mode((1280,720))
clock = pygame.time.Clock()
pygame.display.set_caption("Indy 500 Remastered")

class Car (pygame.sprite.Sprite):
    #Initalises the 10 cars in game with their default stats.
    def __init__ (self, image, position, MaxSpeed, Acceleration, Handling):
        pygame.sprite.Sprite.__init__(self)
        self.image = os.path.join("Graphics", image)
        self.image = pygame.image.load(self.image)
        self.position = position
        self.speed = self.direction = 0
        self.MaxSpeed = MaxSpeed
        self.acceleration = Acceleration
        self.handling = Handling
        self.k_left = self.k_right = self.k_down = self.k_up = 0

    def update(self, deltaTime):
        self.direction = 0
        self.speed += (self.k_up + self.k_down)
        if self.speed > self.MaxSpeed:
            self.speed = self.MaxSpeed
        if self.speed < -self.MaxSpeed:
            self.speed = self.MaxSpeed
        self.direction += (self.k_right + self.k_left)
        print(self.direction)
        dx, dy = self.position
        radian = self.direction * (math.pi /180)
        dx += -self.speed * (math.sin(radian))
        dy += -self.speed * (math.cos(radian))
        print (dx)
        print (dy)
        self.position = ((dx, dy))
        self.image = pygame.transform.rotate(self.image, self.direction)
        self.rect = self.image.get_rect()
        screen.blit(self.image, self.rect)
        self.rect.center = self.position

rect = screen.get_rect()
Car1 = Car("Car1.jpg", rect.center, 2, 10, 10)

#This manages animations to make sure that the screen will refresh.
while True:
    #This section will get the framerate and print it into the shell.
    pygame.event.get()
    deltaTime = clock.tick(60)
    for event in pygame.event.get():
        if not hasattr(event, "key"): continue
        down = event.type == KEYDOWN
        if event.key == K_RIGHT:
            Car1.k_right = down * -3
        elif event.key == K_LEFT:
            Car1.k_left = down * 3
        elif event.key == K_UP:
            Car1.k_up = down * 2
        elif event.key == K_DOWN:
            Car1.k_up = down * -2
        elif event.key == K_ESCAPE:
            sys.exit(0)
    screen.fill ((0,0,170))
    Car1.update(deltaTime)
    pygame.display.flip()

有没有办法解决这个问题？当我打印dx，dy和self.direction时，只有self.direction更改为3或-3。每次旋转都会使图像放大太多吗？可以做些什么来解决这个问题？

谢谢，亚当。

Answer 1

你不应该继续旋转旋转。这有点像影印复印件。您应保留图像的一个主副本，未转换，然后从同一主控创建所有不同的旋转。

每当你在图像上调用旋转时，你得到的是一个更大的图像。这是必要的，因为所有图像都是矩形的 - 如果将方形图像旋转45度，避免切掉任何角落的唯一方法是使得到的图像比原始图像宽40％。您还会发现旋转的副本会失去一些质量，因为除非旋转是90度的倍数，否则方形像素不能完美排列。因此，如果你继续旋转最后一次旋转的结果，你将会变得越来越大（边缘周围有越来越多的空填充）和越来越扭曲的图像，直到它最终太大而无法处理并且程序崩溃或者你的电脑慢慢爬行。

我建议做这样的事情：

def __init__(self, image_filename, ...):
    ...
    self.original_image = pygame.image.load(image_filename)
    ...

def render(self, screen):
    ...
    rotated_image = pygame.transform.rotate(self.original_image, self.angle)
    screen.blit(rotated_image, rotated_image.get_rect(center=(self.x, self.y)))
    ...

def turn(self, clockwise_angle):
    '''
    Rotate clockwise by the given angle in degrees.
    (Or indeed counter-clockwise if the angle is negative.)
    '''
    # Note: self.angle is positive for counter-clockwise
    # rotation, to match pygame.transform.rotate.
    self.angle -= clockwise_angle

Pygame - 旋转图像不会停止拉伸

1 个答案: