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Pygame鼠标进行图片的移动与缩放案例详解

pygame是Python的第三方库，里面提供了使用Python开发游戏的基础包。本文将介绍如何通过Pygame实现鼠标进行图片的移动与缩放，感兴趣的可以关注一下

pygame鼠标进行拖拽移动图片、缩放、以及按钮响应案例

# -*- coding: UTF-8 -*-

#!/usr/bin/env python3

# @Time    : 2021.12

# @Author  : 高二水令

# @Software: 图层拖拽缩放

import os

import sys

import pygame

from pygame.locals import *

class Background(pygame.sprite.Sprite):

    def __init__(self, image_file, location):

        pygame.sprite.Sprite.__init__(self)  #call Sprite initializer

        self.image = pygame.image.load(image_file)

        self.rect = self.image.get_rect()

        self.rect.left, self.rect.top = location

# 写一个函数，判断一个点是否在某个范围内

# 点（x,y）

# 范围 rect(x,y,w,h)

def is_in_rect(pos, rect):

    x, y = pos

    rx, ry, rw, rh = rect

    if (rx <= x <= rx+rw) and (ry <= y <= ry+rh):

        return True

    return False

def move_image(pic_bottom,pic_upper,ssn):

#pic_bottom,pic_upper分别是背景图和上层拖拽图层，ssn是我自己设置的路径信息、不需要可以删去、需要直接运行可以改成main()

    pygame.init()

    screen = pygame.display.set_mode((710, 520))

    BackGround = Background(pic_bottom, [0, 0])

    screen.fill((255, 255, 255))

    myimage = pygame.image.load('.\\next.png')

    myimage = pygame.transform.scale(myimage, (90, 40))

    myimage_x = 600

    myimage_y = 480

    scale_ = pygame.image.load('.\\Avel_scale.tif')

    scale_ = pygame.transform.scale(scale_, (70, 520))

    scale_x = 632

    scale_y = 0

    screen.blit(BackGround.image, BackGround.rect)

    screen.blit(scale_, (scale_x, scale_y))

    screen.blit(myimage, (myimage_x, myimage_y))

    pygame.display.set_caption('图像定标')

    size = []

    location = [0, 0]

    image = pygame.image.load(pic_upper)

    image_x = 100

    image_y = 100

    screen.blit(image,(image_x, image_y))

    pygame.display.flip()

    is_move = False

    run_flag = True

    while (run_flag==True):

        for event in pygame.event.get():

            if event.type == pygame.QUIT:

                exit()

            # 鼠标按下、让状态变成可以移动

            if event.type == pygame.MOUSEBUTTONDOWN:

                w,h = image.get_size()

                if is_in_rect(event.pos, (image_x, image_y, w, h)):

                    is_move = True

            # 鼠标弹起、让状态变成不可以移动

            if event.type == pygame.MOUSEBUTTONUP:

                is_move = False

            # 鼠标移动对应的事件

            if event.type == pygame.MOUSEMOTION:

                if is_move:

                    screen.fill((255, 255, 255))

                    screen.blit(BackGround.image, BackGround.rect)

                    x, y = event.pos

                    image_w, image_h = image.get_size()

                    # 保证鼠标在图片的中心

                    image_y = y-image_h/2

                    image_x = x-image_w/2

                    screen.blit(scale_, (scale_x, scale_y))

                    screen.blit(myimage, (myimage_x, myimage_y))

                    screen.blit(image, (image_x, image_y))

                    #print(image.get_rect())

                    location[0]=event.pos[0]

                    location[1] = event.pos[1]

                    print(event.pos)

                    pygame.display.update()

            #鼠标按钮响应、是点击图片的位置范围进行跳转

            if event.type == pygame.MOUSEBUTTONDOWN and myimage_x <= event.pos[0] <= myimage_x + 90 and \

                    myimage_y <= event.pos[1] <= myimage_y + 40:  # 判断鼠标位置以及是否摁了下去

                    #这里可以写按钮响应的功能

                    pygame.quit()#关闭原来窗口

                    #os.system('ui.py')

                    run_flag = False#跳出循环(不然会报错)

                    #sys.exit()

             #滚轮缩放

            if event.type == MOUSEWHEEL:

                screen.fill((255, 255, 255))

                screen.blit(BackGround.image, BackGround.rect)

                image_width = image.get_width()

                image_heigt = image.get_height()

                image = pygame.transform.scale(image, (

                    image_width + event.y * image_width / image_heigt * 10, image_heigt + event.y * 10))

                screen.blit(scale_, (scale_x, scale_y))

                screen.blit(myimage, (myimage_x, myimage_y))

                screen.blit(image, (image_x, image_y))

                #print(event)

                print(image_width, image_heigt)

                #print(event.flipped)

                pygame.display.update()

预览图大概是这样：

如需直接运行就直接把def move_image(pic_bottom,pic_upper,ssn)这句改成if __name__ == '__main__':并把对应的值传进对应的位置去

到此这篇关于Pygame鼠标进行图片的移动与缩放案例详解的文章就介绍到这了

原文链接：https://blog.csdn.net/qq_42619366/article/details/122099454