甚至不能调用油漆内的函数

Question

import sys, csv
from PySide import QtGui, QtCore
from mainStrato import *

X_START = 10
Y_START = 15
MAX_WIDTH = 1350
MAX_LENGH = 1650
ZOOM = 2.5
WIDTH_PEZZO = 150
LENGH_PEZZO = 600
CENTER_OFFSET_X = 15
CENTER_OFFSET_Y = 0

class Strato(QtGui.QMainWindow, Ui_MainWindow):
    #Apre il file CSV e copia le singole righe in una lista

    def __init__(self, parent=None):
      super(Strato, self).__init__(parent)
      self.setupUi(self)

    def paintEvent(centralwidget, e):

        qp = QtGui.QPainter()
        qp.begin(centralwidget)
    print "paint event"
    qp.end()
        self.drawRectangles(qp)

    def drawRectangles(self, qp):

        color = QtGui.QColor(0, 0, 0)
        color.setNamedColor('#d4d4d4')
        qp.setPen(color)

        qp.setBrush(QtGui.QColor(200, 0, 0))
        coordCarro = QtCore.QRectF(X_START, Y_START, MAX_WIDTH/ZOOM, MAX_LENGH/ZOOM)
        qp.drawRect(coordCarro)


if __name__ == "__main__":

    app = QtGui.QApplication(sys.argv)
    window = Strato()
    window.show()
    sys.exit(app.exec_())

mainstrato是从pyside-uic生成的文件。 调用self.drawRectangles或Strato中调用inside paint event的任何其他函数时出现错误Object not defined？ 如果我在paint事件中复制drawRectangles代码，它就会工作！你知道吗

建议？怎么了？你知道吗

Answer 1

在paintEvent定义中缺少self，我假设centralwidget是UI类的一部分，因此应该可以通过self.centralwidget访问它（因为您是从UI类继承的）。除了self，paintEvent只有一个参数，事件对象。另外，在绘制矩形之前，不能调用qp.end()。最后，您需要正确地缩进您的代码-但在发布问题时，这也可能是复制和粘贴问题。试试看

def paintEvent(self, e):
    qp = QtGui.QPainter()
    qp.begin(self.centralwidget)
    print "paint event"
    self.drawRectangles(qp)
    qp.end()

最后，您可以从一个小部件的paintEvent中should not paint on other widgets。相反，子类QWidget并覆盖其绘制事件。以下sscce工作（删除所有不相关的代码）：

#!/usr/bin/python

import sys
from PySide import QtGui, QtCore

X_START = 10
Y_START = 15
MAX_WIDTH = 1350
MAX_LENGH = 1650
ZOOM = 2.5
WIDTH_PEZZO = 150
LENGH_PEZZO = 600
CENTER_OFFSET_X = 15
CENTER_OFFSET_Y = 0

class PaintWidget(QtGui.QWidget):
    def __init__(self, parent=None):
        super(PaintWidget, self).__init__(parent)

    def paintEvent(self, e):
        qp = QtGui.QPainter(self)
        print("paint event")
        self.drawRectangles(qp)

    def drawRectangles(self, qp):

        color = QtGui.QColor(0, 0, 0)
        color.setNamedColor('#d4d4d4')
        qp.setPen(color)

        qp.setBrush(QtGui.QColor(200, 0, 0))
        coordCarro = QtCore.QRectF(X_START, Y_START, MAX_WIDTH/ZOOM, MAX_LENGH/ZOOM)
        qp.drawRect(coordCarro)

class Strato(QtGui.QMainWindow):

    def __init__(self, parent=None):
        super(Strato, self).__init__(parent)
        self.centralwidget = PaintWidget(self)
        self.setCentralWidget(self.centralwidget)

if __name__ == "__main__":
    app = QtGui.QApplication(sys.argv)
    window = Strato()
    window.show()
    sys.exit(app.exec_())