Pyqt5:Qpainter绘制基础图形(二):鼠标拖画

接着上文:绘制基础图形函数已经全部清楚,然后进阶鼠标拖画。
鼠标拖画,需要用到鼠标事件
鼠标事件:
与C++Qt一样,鼠标事件,需要重载鼠标事件函数如下:

def mousePressEvent(self, e):
    print("鼠标按下事件")
    def mouseReleaseEvent(self, e): 
        print("鼠标释放事件")
        if e.button() == Qt.LeftButton:
            print("左键")
        elif e.button() == Qt.RightButton:
            print("右键")
        elif e.button() == Qt.MidButton:
            print("点击滚轮")
    def mouseMoveEvent(self, e):
        print("鼠标移动事件")

鼠标绘制图形:
Pyqt5:Qpainter绘制基础图形(二):鼠标拖画_第1张图片
点击相应按钮,鼠标拖动画出对应图形:
思路:
创建对应List用来存储鼠标坐标点。
鼠标左键点击绘制,右键清空
画点:
创建List

self.Point_list = [] 

绘制点

if self.Draw == "Point": 
    len_point_list = len(self.Point_list)/2
    for i  in range(int(len_point_list)): #for循环绘制所有坐标点
        painter.drawPoint(self.Point_list[i*2],self.Point_list[i*2+1])
    print("DrawPoint")

鼠标按下事件:存储坐标点

if self.Draw =="Point":
            self.Point_list.append(e.x())
            self.Point_list.append(e.y())
            self.update()#更新界面

所有绘制:
List创建:
其中点、多边行的绘制,皆为不确定List,所以定义为不定长空List。
其他绘制均为定长List

        self.Line_list = [0,0,0,0]
        self.Point_list = []
        self.Elipse_list = [0,0,0,0]
        self.Rectangle_list = [0,0,0,0]
        self.Polygon_list = []
        self.Pie_list = [0,0,0,0]
        self.Arc_list = [0,0,0,0]

绘制函数:
绘制多边形部分,只有鼠标左键按下三次,记录三个坐标点及以上才能绘制多边形

    def paintEvent(self, QPaintEvent):
            painter = QPainter(self)
            painter.setPen(QColor(166,66,250))          
            painter.begin(self) 
            if self.Draw == "Line":         
                painter.drawLine(self.Line_list[0],self.Line_list[1],self.Line_list[2],self.Line_list[3])
                print("DrawLine")
            elif self.Draw == "Point":
                len_point_list = len(self.Point_list)/2
                for i  in range(int(len_point_list)):
                    painter.drawPoint(self.Point_list[i*2],self.Point_list[i*2+1])
                print("DrawPoint")
            elif self.Draw == "Elipse":
                painter.drawEllipse(self.Elipse_list[0],self.Elipse_list[1],self.Elipse_list[2],self.Elipse_list[3])
                print("DrawElipse")
            elif self.Draw == "Rectangle":
                painter.drawRect(self.Rectangle_list[0],self.Rectangle_list[1],self.Rectangle_list[2],self.Rectangle_list[3])
                print("DrawRectangle")
            elif self.Draw == "Text":
                painter.drawText(120,120,"文字")
                print("DrawText")
            elif self.Draw == "Polygon":
                polygon = QPolygon()
                if len(self.Polygon_list) >= 6:
                    polygon.setPoints(self.Polygon_list)
                    print(len(self.Polygon_list))
                    painter.drawPolygon(polygon)
                print("DrawPolygon")
            elif self.Draw == "Pie":
                painter.drawPie(self.Pie_list[0],self.Pie_list[1],self.Pie_list[2],self.Pie_list[3],0*16,120*16)
                print("DrawPie")
            elif self.Draw =="Arc":
                painter.drawArc(self.Arc_list[0],self.Arc_list[1],self.Arc_list[2],self.Arc_list[3],30*16,120*16)
                print("DrawArc")
            elif self.Draw == "Path":
                path = QPainterPath()
                path.addRect(100,100,100,100)
                path.addEllipse(150,150,60,80)
                painter.setBrush(Qt.blue)
                #path.setFillRule(Qt.WindingFill)
                path.setFillRule(Qt.OddEvenFill) 
                painter.drawPath(path)
                print("DrawPath")
            painter.end()

鼠标按下事件:

    def mousePressEvent(self, e):
        if self.Draw == "Line" :
            self.Line_list[0] = e.x()
            self.Line_list[1] = e.y()
            print("start",self.Line_list[0],self.Line_list[1])
        elif self.Draw =="Point":
            self.Point_list.append(e.x())
            self.Point_list.append(e.y())
            self.update()
        elif self.Draw == "Elipse":
            self.Elipse_list[0]=e.x()
            self.Elipse_list[1]=e.y()
        elif self.Draw == "Rectangle":
            self.Rectangle_list[0] = e.x()
            self.Rectangle_list[1] = e.y()
        elif self.Draw == "Polygon":
            self.Polygon_list.append(e.x())
            self.Polygon_list.append(e.y())
            print(self.Polygon_list)
            self.update()
        elif self.Draw == "Pie":
            self.Pie_list[0] = e.x()
            self.Pie_list[1] = e.y()
        elif self.Draw == "Arc":
            self.Arc_list[0] = e.x()
            self.Arc_list[1] = e.y()

        if e.button() == Qt.RightButton:
            self.Point_list.clear()
            self.Elipse_list = [0,0,0,0]
            self.Rectangle_list = [0,0,0,0]
            self.Polygon_list.clear()
            self.Pie_list = [0,0,0,0]
            self.Arc_list = [0,0,0,0]
            self.update()

鼠标移动事件:
除画线以为,其他第二个坐标点均为相对坐标点,长,宽或者半径

    def mouseMoveEvent(self, e):
        if self.Draw == "Line" :
            self.Line_list[2] = e.x()
            self.Line_list[3] = e.y()
            print("end",self.Line_list[2],self.Line_list[3])
            self.update()
        elif self.Draw == "Elipse":
            self.Elipse_list[2] = e.x()-self.Elipse_list[0]
            self.Elipse_list[3] = e.y()-self.Elipse_list[1]
            self.update()
            print("Radius",self.Elipse_list[2],self.Elipse_list[3])
        elif self.Draw == "Rectangle":
            self.Rectangle_list[2] = e.x()-self.Rectangle_list[0]
            self.Rectangle_list[3] = e.y()-self.Rectangle_list[1]
            self.update()
        elif self.Draw == "Pie":
            self.Pie_list[2] = e.x() - self.Pie_list[0]
            self.Pie_list[3] = e.y() - self.Pie_list[1]
            self.update()
        elif self.Draw == "Arc":
            self.Arc_list[2] = e.x() - self.Arc_list[0]
            self.Arc_list[3] = e.y() - self.Arc_list[1]
            self.update()

源代码如下:
源代码

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