版权声明:转载或引用本人版权所有之内容须注明“转自(或引自)Tiny”字样,并标明网址: https://blog.csdn.net/fgh1991/article/details/89888002
在参考别人的基础上,改动不大,重新写了鼠标实现图片的移动、缩放、还原等功能,注释中写出来一些个人理解,欢迎小伙伴们提意见交流。具体代码如下:
# -*- coding: utf-8 -*-
"""
Created on Sun May 5 21:37:54 2019
@author: Tiny
"""
# =============================================================================
''' 鼠标左键移动图片,中键缩放图片,右键还原图片'''
''' 参考: 1. https://blog.csdn.net/fgh1991/article/details/89851327
PyQt5 鼠标点击事件(点击响应事件可自定义):鼠标单击、双击、滚轮滚动、释放、移动等
*2. https://github.com/SmileJET/utils-for-python/tree/master/image_with_mouse_control
Image with Mouse Control'''
# =============================================================================
# =============================================================================
''' PyQt4 和 PyQt5区别:'''
# PySide2.QtGui.QWheelEvent.delta()
# Return type: int
# This function has been deprecated, use pixelDelta() or angleDelta() instead.
''' 重点: '''
# 1. QPainter绘制框线(2019-5-5 20:20):
# QPainter的绘制操作在paintEvents(self, event)中完成,
# 且绘制方法必须放在QtGui.QPainter对象的begain() 和 end()之间
# 直接采用QPaniter.drawRect(int x, int y, int w, int h)反而不能绘制框线
# 2. 图片显示: QLabel vs. QPainter
# 个人认为前者实现静态显示较好; 后者实现动态显示较好。
# =============================================================================
from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtWidgets import QWidget
from PyQt5.QtGui import *
from PyQt5.QtCore import *
import sys
'''定义主窗口'''
class myWindow(QWidget): # 不可用QMainWindow,因为QLabel继承自QWidget
def __init__(self):
super(myWindow, self).__init__()
self.resize(500,500) # 设定窗口大小(根据自己显示图片的大小,可更改)
self.setWindowTitle("图片操作") # 设定窗口名称
self.imgPixmap = QPixmap('image/cc4.png') # 载入图片
self.scaledImg = self.imgPixmap.scaled(self.size()) # 初始化缩放图
self.singleOffset = QPoint(0, 0) # 初始化偏移值
self.isLeftPressed = bool(False) # 图片被点住(鼠标左键)标志位
self.isImgLabelArea = bool(True) # 鼠标进入label图片显示区域
'''重载绘图: 动态绘图'''
def paintEvent(self,event):
self.imgPainter = QPainter() # 用于动态绘制图片
self.imgFramePainter = QPainter() # 用于动态绘制图片外线框
self.imgPainter.begin(self) # 无begin和end,则将一直循环更新
self.imgPainter.drawPixmap(self.singleOffset, self.scaledImg) # 从图像文件提取Pixmap并显示在指定位置
self.imgFramePainter.setPen(QColor(168, 34, 3)) # 不设置则为默认黑色 # 设置绘图颜色/大小/样式
self.imgFramePainter.drawRect(10, 10, 480, 480) # 为图片绘外线狂(向外延展1)
self.imgPainter.end() # 无begin和end,则将一直循环更新
# =============================================================================
# 图片移动: 首先,确定图片被点选(鼠标左键按下)且未左键释放;
# 其次,确定鼠标移动;
# 最后,更新偏移值,移动图片.
# =============================================================================
'''重载一下鼠标按下事件(单击)'''
def mousePressEvent(self, event):
if event.buttons() == QtCore.Qt.LeftButton: # 左键按下
print("鼠标左键单击") # 响应测试语句
self.isLeftPressed = True; # 左键按下(图片被点住),置Ture
self.preMousePosition = event.pos() # 获取鼠标当前位置
elif event.buttons () == QtCore.Qt.RightButton: # 右键按下
print("鼠标右键单击") # 响应测试语句
elif event.buttons() == QtCore.Qt.MidButton: # 中键按下
print("鼠标中键单击") # 响应测试语句
elif event.buttons() == QtCore.Qt.LeftButton | QtCore.Qt.RightButton: # 左右键同时按下
print("鼠标左右键同时单击") # 响应测试语句
elif event.buttons() == QtCore.Qt.LeftButton | QtCore.Qt.MidButton: # 左中键同时按下
print("鼠标左中键同时单击") # 响应测试语句
elif event.buttons() == QtCore.Qt.MidButton | QtCore.Qt.RightButton: # 右中键同时按下
print("鼠标右中键同时单击") # 响应测试语句
elif event.buttons() == QtCore.Qt.LeftButton | QtCore.Qt.MidButton \
| QtCore.Qt.RightButton: # 左中右键同时按下
print("鼠标左中右键同时单击") # 响应测试语句
'''重载一下滚轮滚动事件'''
def wheelEvent(self, event):
# if event.delta() > 0: # 滚轮上滚,PyQt4
# This function has been deprecated, use pixelDelta() or angleDelta() instead.
angle=event.angleDelta() / 8 # 返回QPoint对象,为滚轮转过的数值,单位为1/8度
angleX=angle.x() # 水平滚过的距离(此处用不上)
angleY=angle.y() # 竖直滚过的距离
if angleY > 0: # 滚轮上滚
print("鼠标中键上滚") # 响应测试语句
self.scaledImg = self.imgPixmap.scaled(self.scaledImg.width()+5,
self.scaledImg.height()+5)
newWidth = event.x() - (self.scaledImg.width() * (event.x()-self.singleOffset.x())) \
/ (self.scaledImg.width()-5)
newHeight = event.y() - (self.scaledImg.height() * (event.y()-self.singleOffset.y())) \
/ (self.scaledImg.height()-5)
self.singleOffset = QPoint(newWidth, newHeight) # 更新偏移量
self.repaint() # 重绘
else: # 滚轮下滚
print("鼠标中键下滚") # 响应测试语句
self.scaledImg = self.imgPixmap.scaled(self.scaledImg.width()-5,
self.scaledImg.height()-5)
newWidth = event.x() - (self.scaledImg.width() * (event.x()-self.singleOffset.x())) \
/ (self.scaledImg.width()+5)
newHeight = event.y() - (self.scaledImg.height() * (event.y()-self.singleOffset.y())) \
/ (self.scaledImg.height()+5)
self.singleOffset = QPoint(newWidth, newHeight) # 更新偏移量
self.repaint() # 重绘
'''重载一下鼠标键公开事件'''
def mouseReleaseEvent(self, event):
if event.buttons() == QtCore.Qt.LeftButton: # 左键释放
self.isLeftPressed = False; # 左键释放(图片被点住),置False
print("鼠标左键松开") # 响应测试语句
elif event.button() == Qt.RightButton: # 右键释放
self.singleOffset = QPoint(0, 0) # 置为初值
self.scaledImg = self.imgPixmap.scaled(self.size()) # 置为初值
self.repaint() # 重绘
print("鼠标右键松开") # 响应测试语句
'''重载一下鼠标移动事件'''
def mouseMoveEvent(self,event):
if self.isLeftPressed: # 左键按下
print("鼠标左键按下,移动鼠标") # 响应测试语句
self.endMousePosition = event.pos() - self.preMousePosition # 鼠标当前位置-先前位置=单次偏移量
self.singleOffset = self.singleOffset + self.endMousePosition # 更新偏移量
self.preMousePosition = event.pos() # 更新当前鼠标在窗口上的位置,下次移动用
self.repaint() # 重绘
# '''重载一下鼠标双击事件'''
# def mouseDoubieCiickEvent(self, event):
# if event.buttons() == QtCore.Qt.LeftButton: # 左键按下
# self.setText ("双击鼠标左键的功能: 自己定义")
#
#
# '''重载一下鼠标进入控件事件'''
# def enterEvent(self, event):
#
#
# '''重载一下鼠标离开控件事件'''
# def leaveEvent(self, event):
#
# '''重载一下鼠标进入控件事件'''
# def enterEvent(self, event):
#
#
# '''重载一下鼠标离开控件事件'''
# def leaveEvent(self, event):
#
'''主函数'''
if __name__ == "__main__":
app = QtWidgets.QApplication(sys.argv)
myshow = myWindow()
myshow.show()
sys.exit (app.exec_())
用到的图片如下:
主要参考链接如下: