help on paint event

[Luca Bertolotti]

Hello i'm not able to paint on my widget:
i wrote this but nothing is painted:
# -*- coding: utf-8 -*-

"""
Module implementing Form.
"""

from PyQt5.QtCore import pyqtSlot, QRect
from PyQt5.QtWidgets import QWidget, QFileDialog
from PyQt5.QtGui import QPainter, QBrush, QPen
from PyQt5.QtCore import Qt
import ezdxf
#from ezdxf.addons.drawing import matplotlib
#from ezdxf.groupby import groupby
import math


from Ui_form import Ui_Form


class Form(QWidget, Ui_Form):
    """
    Class documentation goes here.
    """
    def __init__(self, parent=None):
        """
        Constructor

        @param parent reference to the parent widget
        @type QWidget
        """
        super(Form, self).__init__(parent)
        self.setupUi(self)
        self.arco = False
        self.line = False

    @pyqtSlot()
    def on_pushButton_clicked(self):
        """
        Slot documentation goes here.
        """
        # TODO: not implemented yet
        #raise NotImplementedError
        self.carico_file()



    @pyqtSlot()
    def on_pushButton_2_clicked(self):
        """
        Slot documentation goes here.
        """
        # TODO: not implemented yet
        raise NotImplementedError


    def carico_file(self):
            fname = QFileDialog.getOpenFileName(self, 'Open file', None,
("Drawing (*.dxf )"))
            doc = ezdxf.readfile(fname[0])
            msp = doc.modelspace()
            lista_disegno = []
            a = 0
            for entity in msp:
                self.arco = False
                self.linea =False
                print(entity.dxfattribs())
                if entity.dxftype() == 'LINE':
                    linea_x = entity.dxf.end[0]-entity.dxf.start[0]
                    linea_y = entity.dxf.end[1]-entity.dxf.start[1]
                    lista_disegno.append('linea_x'+str(a)+': '+str(linea_x))
                    lista_disegno.append('linea_y'+str(a)+': '+str(linea_y))
                    self.x1 = entity.dxf.start[0]
                    self.y1 = entity.dxf.start[1]
                    self.x2 = entity.dxf.end[0]
                    self.y2 = entity.dxf.end[1]
                    print('linea', self.x1, self.y1, self.x2, self.y2)
                    a = a+1
                    self.linea = True
                    self.update()
                if entity.dxftype()=='ARC':
                    angolo_tot_gradi =
entity.dxf.end_angle-entity.dxf.start_angle
                    lung_arco=
2*math.pi*entity.dxf.radius/360*angolo_tot_gradi
                    lista_disegno.append('arco'+str(a)+': '+str(lung_arco))
                    self.startangle = entity.dxf.start_angle
                    self.spanangle = lung_arco
                    xr = entity.dxf.center[0]
                    yr = entity.dxf.center[1]
                    r = entity.dxf.radius
                    self.rectangle = QRect(xr, yr, 2*r, 2*r)
                    self.arco = True
                    #self.update()
                    #self.draw_arc(rectangle, startangle, spanangle)
                print(lista_disegno)
                self.update()

    def paintEvent(self, event):
        if self.arco == True:
            qp = QPainter()
            #qp.begin(self)
            pen = QPen(Qt.red, 2, Qt.SolidLine)
            qp.setPen(pen)
            qp.drawArc(self.rectangle, self.startangle, self.spanangle)
        if self.line == True:
            qp = QPainter()
            pen = QPen(Qt.red, 2, Qt.SolidLine)
            qp.setPen(pen)
            qp.drawLine(self.x1, self.y1, self.x2, self.y2)
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