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python pyqt5(鼠标左键画图,右键移动图片,滚轮控制图片放缩)

程序员文章站 2023-12-29 09:02:58
import sysimport osfrom PyQt5 import QtWidgets,QtCore,QtGui,Qt import cv2.cv2 as cv class MainWindow(QtWidgets.QWidget): def __init__(self): super().__init__() self.initUI() self.path = "" self.cur_img = ""...

鼠标左键画图,右键移动图片


import sys
import os
from PyQt5 import QtWidgets,QtCore,QtGui,Qt 
import cv2.cv2 as cv
   
class MainWindow(QtWidgets.QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()     
        self.path = ""
        self.cur_img = ""
        self.img_w = ""
        self.img_h = ""
        self.left_flag = False
        self.right_flag = False
        self.label_x = 0    #label当前坐标
        self.label_y = 0
        self.mouse_mv_x = ""   #鼠标移动上一次坐标
        self.mouse_mv_y = ""
        self.x1 = ""
        self.y1 = ""

        self.last_x = ""    #画画上一个点坐标
        self.last_y = ""
        self.mouse_mv_x1 = ""    #中转点
        self.mouse_mv_y1 = ""
        
    def initUI(self):                             
        self.setGeometry(300, 200, 580, 430)        
        self.setWindowTitle('Hello')     
        
        self.pushbutton = QtWidgets.QPushButton(self)
        self.pushbutton.setGeometry(0, 0, 100, 30)
        self.pushbutton.clicked.connect(self.open_pic)
        self.pushbutton.setText("选择图片")

        self.groupbox = QtWidgets.QGroupBox(self)
        self.groupbox.setGeometry(0, 30, 580, 400)

        self.label = QtWidgets.QLabel(self.groupbox)
        self.label.setGeometry(0, 0, 580, 400)
        
    #打开一个图片文件   
    def open_pic(self):
        self.path = Qt.QFileDialog.getOpenFileName()
        self.cur_img = cv.imread(self.path[0])
        self.img_w = 580
        self.img_h = 400
        #self.cur_img = cv.cvtColor(self.cur_img, cv.COLOR_BGR2RGB)
        self.label.setPixmap(QtGui.QPixmap(self.path[0]).scaled(self.img_w,self.img_h))   #在label中显示图片

    #鼠标左击事件
    def mousePressEvent(self,event):
        if event.buttons() == QtCore.Qt.LeftButton:
            self.left_flag = True
        if event.buttons() == QtCore.Qt.RightButton:
            self.right_flag = True
    
    #鼠标释放事件
    def mouseReleaseEvent(self,event):
        self.left_flag = False
        self.right_flag = False
        self.mouse_mv_y = ""
        self.mouse_mv_x = ""
        self.last_x = ""
        self.last_y = ""
        
    #鼠标移动事件
    def mouseMoveEvent(self,event):
        if self.left_flag:     #鼠标左击                       
            self.x1 = event.x()
            self.y1 = event.y()
            mv_x = int((self.x1 - self.label_x)*self.cur_img.shape[1]/580)
            mv_y = int((self.y1 - 30 - self.label_y)*self.cur_img.shape[0]/400)
            cv.circle(self.cur_img,(mv_x, mv_y), 4, (0,0,0), -1)
            if self.last_x != "" and self.last_y != "":
                #if self.mouse_mv_x != "" and self.mouse_mv_y != "":
                cv.line(self.cur_img,(int((self.last_x-self.label_x) *self.cur_img.shape[1]/580),int((self.last_y-self.label_y - 30)*self.cur_img.shape[0]/400)),(int((self.x1-self.label_x) *self.cur_img.shape[1]/580),int((self.y1 -self.label_y- 30)*self.cur_img.shape[0]/400)),(0,0,0),8)
                #elif self.mouse_mv_x == "" and self.mouse_mv_y == "":
                #    cv.line(self.cur_img,(int(self.last_x*self.cur_img.shape[1]/580),int((self.last_y - 30)*self.cur_img.shape[0]/400)),(int(self.x1*self.cur_img.shape[1]/580),int((self.y1-30)*self.cur_img.shape[0]/400)),(0,0,0),8)
            self.last_x = self.x1
            self.last_y = self.y1

            img2 = cv.cvtColor(self.cur_img, cv.COLOR_BGR2RGB)
            QImage = QtGui.QImage(img2, self.cur_img.shape[1], self.cur_img.shape[0],3*self.cur_img.shape[1],QtGui.QImage.Format_RGB888)
            pixmap = QtGui.QPixmap(QImage).scaled(self.label.width(),self.label.height())
            self.label.setPixmap(pixmap)

        if self.right_flag:    #鼠标右击
            self.x1 = event.x()
            self.y1 = event.y()
            if self.mouse_mv_x != "" and self.mouse_mv_y != "":
                self.label_x = self.label_x + (self.x1 - self.mouse_mv_x)
                self.label_y = self.label_y + (self.y1 - self.mouse_mv_y)
            self.mouse_mv_x = self.x1
            self.mouse_mv_y = self.y1
            self.label.setGeometry(self.label_x, self.label_y, 580, 400)

if __name__ == '__main__':
    app=QtWidgets.QApplication(sys.argv)    
    win=MainWindow()    
    win.show()    
    sys.exit(app.exec_())


滚轮控制图片放缩


import sys
import os
from PyQt5 import QtWidgets,QtCore,QtGui,Qt 
import cv2.cv2 as cv
   
class MainWindow(QtWidgets.QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()     
        self.path = ""
        self.cur_img = ""
        self.img_w = ""
        self.img_h = ""
        self.resize_point = 10
        self.cur_resimg = ""
        
    def initUI(self):                             
        self.setGeometry(300, 200, 580, 430)        
        self.setWindowTitle('Hello')     
        
        self.pushbutton = QtWidgets.QPushButton(self)
        self.pushbutton.setGeometry(0, 0, 100, 30)
        self.pushbutton.clicked.connect(self.open_pic)
        self.pushbutton.setText("选择图片")

        self.groupbox = QtWidgets.QGroupBox(self)
        self.groupbox.setGeometry(0, 30, 580, 400)

        self.label = QtWidgets.QLabel(self.groupbox)
        self.label.setGeometry(0, 0, 580, 400)
         
    def open_pic(self):
        self.path = Qt.QFileDialog.getOpenFileName()
        self.cur_img = cv.imread(self.path[0])
        self.img_w = 580
        self.img_h = 400
        self.label.setPixmap(QtGui.QPixmap(self.path[0]).scaled(self.img_w,self.img_h))   
    
    def wheelEvent(self, event):
        self.angle = event.angleDelta( ) /8                 
        self.angleY = self.angle.y()                     
        if self.angleY>0:
            if self.resize_point >= 1 and self.resize_point <= 19:     
                self.resize_point += 1                   
        elif self.angleY<0:                        
            if self.resize_point >= 2 and self.resize_point <= 20:     
                self.resize_point -= 1                   
        self.cur_resimg = cv.resize(self.cur_img,(int(self.cur_img.shape[1]*self.resize_point/10),int(self.cur_img.shape[0]*self.resize_point/10)))
        img2 = cv.cvtColor(self.cur_resimg, cv.COLOR_BGR2RGB)        
        QImage = QtGui.QImage(img2, self.cur_resimg.shape[1], self.cur_resimg.shape[0],3*self.cur_resimg.shape[1],QtGui.QImage.Format_RGB888)
        pixmap = QtGui.QPixmap(QImage).scaled(self.cur_resimg.shape[1],self.cur_resimg.shape[0])

        self.label_w = self.cur_resimg.shape[1]     
        self.label_h = self.cur_resimg.shape[0]     
        self.label.setGeometry(QtCore.QRect(int((1-self.resize_point/10)*self.cur_resimg.shape[1]/2),int((1-self.resize_point/10)*self.cur_resimg.shape[0]/2),self.label_w,self.label_h))       
        self.label.setPixmap(pixmap)
                    
if __name__ == '__main__':
    app=QtWidgets.QApplication(sys.argv)    
    win=MainWindow()    
    win.show()    
    sys.exit(app.exec_())


本文地址:https://blog.csdn.net/qq_36780295/article/details/109034448
相关标签: 代码案例 pyqt5

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