pyqt5绘制坐标系

def paintEvent(self, event):
    painter = QPainter()
    painter.begin(self)

    
    # 绘制图像
    image = self.pix
    if image.width()>0:
        rect = QRect(0, 0, image.width(), image.height())
        painter.drawImage(rect, image)

    if self.is_draw_origin_point:
        point_pen = QPen(QColor(220,0,0),10)
        painter.setPen(point_pen)
        painter.drawPoint(self.origin_x,self.origin_y)

    if self.is_draw_vectorX_point:
        point_pen_x = QPen(self.x_color,10)
        painter.setPen(point_pen_x)
        painter.drawPoint(self.vectorX_x,self.vectorX_y)


    if self.is_draw_vectorY_point:
        point_pen = QPen(self.y_color,10)
        painter.setPen(point_pen)
        painter.drawPoint(self.vectorY_x,self.vectorY_y)

    if self.is_draw_axis:
        point_pen_x = QPen(self.x_color,5)
        painter.setPen(point_pen_x)
        painter.drawLine(self.origin_x,self.origin_y,self.vectorX_x,self.vectorX_y)
        painter.drawLine(self.vectorX_x-10,self.vectorX_y-10,self.vectorX_x,self.vectorX_y)
        painter.drawLine(self.vectorX_x-10,self.vectorX_y+10,self.vectorX_x,self.vectorX_y)

        point_pen_y = QPen(self.y_color,5)
        painter.setPen(point_pen_y)
        painter.drawLine(self.origin_x,self.origin_y,self.vectorY_x,self.vectorY_y)
        painter.drawLine(self.vectorY_x-10,self.vectorY_y-10,self.vectorY_x,self.vectorY_y)
        painter.drawLine(self.vectorY_x+10,self.vectorY_y-10,self.vectorY_x,self.vectorY_y)