具有特定频率的闪烁矩形白色 pygame [英] Blinking rectangle white pygame with specific frequency

问题描述

我是一名大学生，我有一个具体的问题.

I'm student at university and I have a specific question.

目前我在窗口中央显示一个白色矩形，pygame 位于黑色背景上方.但目前我想以特定频率闪烁我的白色矩形，这就是我需要帮助的原因.

Presently I display a white rectangle in center of a window with pygame above a black background. But presently I would like to blinking my white rectangle at a specific frequency, and it's why a I need help.

目前我实现了:

import pygame, sys
from pygame.locals import *

def main():
    pygame.init()

    fenetre = pygame.display.set_mode((500,400),0,32)

    black=(0,0,0)
    white=(255,255,255)

    fenetre.fill(black)

    pygame.draw.rect(fenetre, white,(200,150,100,50))


    while True:
        for event in pygame.event.get():
            if event.type==QUIT:
                pygame.quit()
                sys.exit()
        pygame.display.update()

main()

感谢您的帮助社区.

Thanks for your help community.

推荐答案

非常流行的控制元素的方法是使用时间.

Very popular method to control elements is using time.

您设置下一个更改状态的时间，然后将其与当前时间进行比较.通过这种方式，您可以控制对象并且不会停止 while True 循环，因此它可以做其他事情.

You set time of next change state and then you compare this with current time. This way you control object and you don't stop while True loop so it cando other things.

import pygame
import sys

# --- constants ---

BLACK = (  0,   0,   0)
WHITE = (255, 255, 255)

# --- main ---

def main():
    pygame.init()

    fenetre = pygame.display.set_mode((500, 400), 0, 32)

    # time in millisecond from start program 
    current_time = pygame.time.get_ticks()

    # how long to show or hide
    delay = 500 # 500ms = 0.5s

    # time of next change 
    change_time = current_time + delay
    show = True

    while True:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                pygame.quit()
                sys.exit()

        # --- updates ---

        current_time = pygame.time.get_ticks()

        # is time to change ?
        if current_time >= change_time:
            # time of next change 
            change_time = current_time + delay
            show = not show

        # --- draws ---

        fenetre.fill(BLACK)

        if show:
            pygame.draw.rect(fenetre, WHITE,(200,150,100,50))

        pygame.display.update()

main()

<小时>

更多元素相同

import pygame
import sys

# --- constants ---

BLACK = (  0,   0,   0)
WHITE = (255, 255, 255)
RED   = (255,   0,   0)
GREEN = (  0, 255,   0)

# --- main ---

def main():
    pygame.init()

    fenetre = pygame.display.set_mode((500, 400), 0, 32)

    current_time = pygame.time.get_ticks()

    # time of show or hide
    delay = 500 # 500ms = 0.5s

    # time of next change (WHITE)
    change_time = current_time + delay
    show = True

    # time of next change (RED)
    red_change_time = current_time + delay + 150
    red_show = False

    # time of next change (GREEN)
    green_change_time = current_time + delay + 300
    green_show = False

    while True:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                pygame.quit()
                sys.exit()

        # --- updates ---

        current_time = pygame.time.get_ticks()

        # is time to change ? (WHITE)
        if current_time >= change_time:
            change_time = current_time + delay
            show = not show

        # is time to change ? (RED)
        if current_time >= red_change_time:
            red_change_time = current_time + delay
            red_show = not red_show

        # is time to change ? (GREEN)
        if current_time >= green_change_time:
            green_change_time = current_time + delay
            green_show = not red_show

        # --- draws ---

        fenetre.fill(BLACK)

        if show: # (WHITE)
            pygame.draw.rect(fenetre, WHITE, (200,150,100,50))

        if red_show: # (RED)
            pygame.draw.rect(fenetre, RED, (100,150,100,50))

        if green_show: # (GREEN)
            pygame.draw.rect(fenetre, GREEN, (300,150,100,50))

        pygame.display.update()

main()

<小时>

使用类的版本.但这次用不同的频率

---

version using class. But this time with different frequencies

import pygame
import sys

# --- constants ---

BLACK = (  0,   0,   0)
WHITE = (255, 255, 255)
RED   = (255,   0,   0)
GREEN = (  0, 255,   0)

# --- classes ---

class Rectangle():

    def __init__(self, color, rect, time, delay):
        self.color = color
        self.rect = rect
        self.time = time
        self.delay = delay
        self.show = False

    def draw(self, screen):
        if self.show:
            pygame.draw.rect(screen, self.color, self.rect)

    def update(self, current_time):
        if current_time >= self.time:
             self.time = current_time + self.delay
             self.show = not self.show

# --- main ---

def main():
    pygame.init()

    fenetre = pygame.display.set_mode((500, 400), 0, 32)

    current_time = pygame.time.get_ticks()

    # time of show or hide
    delay = 500 # 5000ms = 0.5s

    # objects    
    rect_white = Rectangle(WHITE, (200,150,100,50), current_time, 500)
    rect_red = Rectangle(RED, (100,150,100,50), current_time + 150, 100)
    rect_green = Rectangle(GREEN, (0, 0, 500, 400), current_time + 300, 2000)

    while True:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                pygame.quit()
                sys.exit()

        # --- updates ---

        current_time = pygame.time.get_ticks()

        rect_white.update(current_time)
        rect_red.update(current_time)
        rect_green.update(current_time)

        # --- draws ---

        fenetre.fill(BLACK)

        rect_green.draw(fenetre)
        rect_white.draw(fenetre)
        rect_red.draw(fenetre)

        pygame.display.update()

main()

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