[pyGame learning notes] 5 Collision detection of rect objects

This time, , Let's learn rect Collision detection of objects

First , Give the frame code ：

import pygame
from pygame.locals import *
import sys

class Game:
    def __init__(self):
        pygame.init()
        self.W,self.H=800,800
        self.screen=pygame.display.set_mode((self.W,self.H))
        pygame.display.set_caption("【Pygame  Learning notes 】")

    def listen(self):
        for event in pygame.event.get():
            if event.type==QUIT:
                sys.exit()

    def draw(self):
        self.screen.fill((255,255,255))

    def run(self):
        while True:
            self.listen()
            self.draw()
            pygame.display.update()

if __name__ == '__main__':
    game=Game()
    game.run()

First , yes rect Collision with points , use rect Self contained colliderect function , The return value is bool

collidepoint(x,y)

collidepoint([x,y])

These are two ways of writing , such as , Let's draw a square first , stay draw Add ：

        rect=pygame.draw.rect(self.screen,(255,0,0),(10,10,100,100))

Then conduct collision detection ：

        if rect.collidepoint(pygame.mouse.get_pos()):
            print(True)

such , As long as you touch the mouse, it will output True

Next , Let's learn two rect Collision , It is necessary to make many games , We remove the collision detection code above , Keep drawing rect Code for , Then draw the second figure ：

        rect2=pygame.draw.rect(self.screen,(0,0,255),(self.x,10,40,40))

Here, our second figure needs to move constantly in the window , Rebound on the edge , Output when you encounter the first figure True, You need it here colliderect function , First define two variables in initialization

        self.x=90
        self.speed=0.2

Drawing rect2 When , Update the location first

self.x+=self.speed

Then carry out the collision operation and the operation of detecting the collision edge , Detecting collision edges is simple , Use rect Compare some parameters with the length and width of the window , Then set the speed to its opposite number

        if rect.colliderect(rect2):
            print(True)
        if rect2.right>=self.W or rect2.left<0:
            self.speed=-self.speed

That's it , When the figures of brother Lian collide , The program will always output True

The reference codes are as follows ：

import pygame
from pygame.locals import *
import sys

class Game:
    def __init__(self):
        pygame.init()
        self.W,self.H=800,800
        self.screen=pygame.display.set_mode((self.W,self.H))
        pygame.display.set_caption("【Pygame  Learning notes 】")
        self.x=90
        self.speed=0.2

    def listen(self):
        for event in pygame.event.get():
            if event.type==QUIT:
                sys.exit()

    def draw(self):
        self.screen.fill((255,255,255))
        rect=pygame.draw.rect(self.screen,(255,0,0),(10,10,100,100))
        # if rect.collidepoint(pygame.mouse.get_pos()):
        #     print(True)
        self.x+=self.speed
        rect2=pygame.draw.rect(self.screen,(0,0,255),(self.x,10,40,40))
        if rect.colliderect(rect2):
            print(True)
        if rect2.right>=self.W or rect2.left<0:
            self.speed=-self.speed

    def run(self):
        while True:
            self.listen()
            self.draw()
            pygame.display.update()

if __name__ == '__main__':
    game=Game()
    game.run()

rect There are also some ways to detect collisions ：collidelist,collidedict wait ,collidelist Pass in a list , There are multiple in the list rect,collidedict Pass in rect Dictionary , Also almost , But not particularly commonly used , I won't explain it here ~

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