Question

我正在尝试使绘画游戏在鼠标拖动处绘制一个圆，但是这些圆不会经常更新以创建平滑线。我该如何解决？

import pygame
from random import randint
width=800
height=600
pygame.init() #As necessary as import, initalizes pygame
global gameDisplay 
gameDisplay = pygame.display.set_mode((width,height))#Makes window
pygame.display.set_caption('Demo')#Titles window
clock = pygame.time.Clock()#Keeps time for pygame


gameDisplay.fill((0,0,255))

class Draw:
    def __init__(self):
        self.color = (255, 0, 0)

    def update(self, x, y):
        self.x = x
        self.y = y
        pygame.draw.circle(gameDisplay, self.color, (self.x, self.y), (5))


end = False
down = False
Line = Draw()
while not end:
    x, y = pygame.mouse.get_pos()
    #drawShape()
    #pygame.draw.rect(gameDisplay, (0,255,0), (10, 10, 4, 4))
    for event in pygame.event.get():
        if event.type == pygame.MOUSEBUTTONDOWN:
            down = True

        if event.type == pygame.MOUSEBUTTONUP:
            down = False

        if down:
            Line.update(x, y)

        if event.type == pygame.QUIT:
            end = True
    lastx, lasty = pygame.mouse.get_pos()
    pygame.display.update()

    clock.tick(60)

pygame.quit()

这就是我的问题

Answer 1

我建议从上一个鼠标位置到当前鼠标位置画一条线。另外在该行的起点和终点画一个点。这导致圆的开始和结束。
跟踪鼠标的上一个位置（lastx，lasty），并在主应用程序循环而不是事件循环中画线：

例如：

import pygame

width, height = 800, 600
pygame.init() #As necessary as import, initalizes pygame
gameDisplay = pygame.display.set_mode((width,height)) #Makes window
pygame.display.set_caption('Demo') #Titles window
clock = pygame.time.Clock() #Keeps time for pygame
gameDisplay.fill((0,0,255))

class Draw:
    def __init__(self):
        self.color = (255, 0, 0)

    def update(self, from_x, from_y, to_x, to_y):
        pygame.draw.circle(gameDisplay, self.color, (from_x, from_y), 5)
        pygame.draw.line(gameDisplay, self.color, (from_x, from_y), (to_x, to_y), 10)
        pygame.draw.circle(gameDisplay, self.color, (to_x, to_y), 5)

end = False
down = False
line = Draw()
while not end:
    for event in pygame.event.get():
        if event.type == pygame.MOUSEBUTTONDOWN:
            lastx, lasty = event.pos
            down = True
        if event.type == pygame.MOUSEBUTTONUP:
            down = False
        if event.type == pygame.QUIT:
            end = True

    x, y = pygame.mouse.get_pos() 
    if down:
        line.update(lastx, lasty, x, y)
    lastx, lasty = x, y

    pygame.display.update()
    clock.tick(60)

pygame.quit()

如何使用Pygame来使此演示绘图游戏更新绘制圆圈的速度更快？

1 个答案: