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- import pygame
- import sys
- from pygame.locals import *
- pygame.init()
- size=width,height=600,300
- bg=(255,255,255)
- clock=pygame.time.Clock()
- screen=pygame.display.set_mode(size)
- pygame.display.set_caption("初次见面,请大家多多关照!")
- turtle=pygame.image.load('悟空.jpg')
- position=turtle.get_rect()
- position.center = width//2,height//2
- # 0-->未选择,1-->选择中,2-->选择完成
- select = 0
- select_rect = pygame.Rect(0,0,0,0)
- # 0-->未拖拽,1-->拖拽中,2-->拖拽完成
- drag = 0
- while True:
- for event in pygame.event.get():
- if event.type == pygame.QUIT:
- sys.exit()
-
- elif event.type == MOUSEBUTTONDOWN:
- if event.button == 1:
- #第一次点击,选择范围
- if select ==0 and drag ==0:
- pos_start = event.pos
- select = 1
- #第二次点击,拖拽图像
- elif select ==2 and drag ==0:
- capture = screen.subsurface(select_rect).copy()
- cap_rect = capture.get_rect()
- drag = 1
- #第三次点击,初始化
- elif select ==2 and drag ==2:
- select = 0
- drag = 0
-
- elif event.type == MOUSEBUTTONUP:
- if event.button == 1:
- #第一次释放,结束选择
- if select ==1 and drag ==0:
- pos_stop = event.pos
- select = 2
- #第二次释放,结束拖拽
- elif select ==2 and drag == 1:
- drag = 2
-
-
- screen.fill(bg)
- screen.blit(turtle,position)
-
- #实时绘制选择框
- if select:
- mouse_pos = pygame.mouse.get_pos()
- if select == 1:
- pos_stop = mouse_pos
- select_rect.left,select_rect.top = pos_start
- select_rect.width,select_rect_height = pos_stop[0]-pos_start[0],pos_stop[1]-pos_start[1]
- pygame.draw.rect(screen,(0,0,0),select_rect,1)
- #拖拽裁剪的图像
- if drag:
- if drag ==1:
- cap_rect.center = mouse_pos
- screen.blit(capture,cap_rect)
-
- pygame.display.flip()
- clock.tick(30)
复制代码
实时绘制选择框这里为啥框不出选择框咨询一下- pygame.draw.rect(screen,(0,0,0),select_rect,1)
复制代码
本帖最后由 isdkz 于 2023-4-24 21:49 编辑
您好!我注意到您的代码中有一个小错误,导致选择框不能正确显示。在定义select_rect的长和宽时(第70行),您应该使用select_rect.width和select_rect.height,而不是select_rect_height。请参阅以下修复后的代码段:
- if select:
- mouse_pos = pygame.mouse.get_pos()
- if select == 1:
- pos_stop = mouse_pos
- select_rect.left, select_rect.top = pos_start
- select_rect.width, select_rect.height = pos_stop[0] - pos_start[0], pos_stop[1] - pos_start[1]
- pygame.draw.rect(screen, (0, 0, 0), select_rect, 1)
复制代码
将此修复后的代码段替换到您的代码中,选择框应该能正确显示了。
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