ensemble fond QPainter

Question

Salut tout le monde je travaille sur l'utilisation des événements QPainter et de la souris et je veux mettre l'arrière-plan du QPainter noir j'ai utilisé ce code, mais ne fonctionne pas Merci d'avance

class Drawer(QWidget): 

    newPoint = pyqtSignal(QPoint) 
    def __init__(self, parent=None): 
     QWidget.__init__(self, parent) 
     self.path = QPainterPath()  

    def paintEvent(self, event): 
     painter = QPainter(self) 
     painter.setPen(QColor(168, 34, 3)) 
     painter.setFont(QFont('Decorative', 10)) 
     bbrush = QtGui.QBrush(QtGui.QColor(0,0,0),QtCore.Qt.SolidPattern) 
     painter.setBackground(painter,bbrush) 
     painter.drawPath(self.path) 

    def mousePressEvent(self, event): 
     self.path.moveTo(event.pos()) 
     self.update() 

    def mouseMoveEvent(self, event): 
     self.path.lineTo(event.pos()) 
     self.newPoint.emit(event.pos()) 
     self.update() 

    def sizeHint(self): 
     return QSize(400, 400) 

---

class MyWidget(QWidget): 

    def __init__(self, parent=None): 
     QWidget.__init__(self, parent) 
     self.setLayout(QVBoxLayout()) 
     label = QLabel(self) 
     drawer = Drawer(self) 
     drawer.newPoint.connect(lambda p: label.setText(
         'Coordinates: (%d : %d)' % (p.x(), p.y()))) 
     self.layout().addWidget(label) 
     self.layout().addWidget(drawer) 

Answer 1

Si vous essayez juste d'obtenir un fond noir vous pouvez obtenir ce sans paintEvent.

import sys 
from PyQt5.QtWidgets import * 
from PyQt5.QtCore import * 
from PyQt5.QtGui import * 


class Drawer(QWidget): 

    newPoint = pyqtSignal(QPoint) 

    def __init__(self, parent=None): 
     QWidget.__init__(self, parent) 
     self.path = QPainterPath()  

     # set black background 
     pal = self.palette() 
     pal.setColor(QPalette.Background, Qt.black) 
     self.setAutoFillBackground(True) 
     self.setPalette(pal) 

    def mousePressEvent(self, event): 
     self.path.moveTo(event.pos()) 
     self.update() 

    def mouseMoveEvent(self, event): 
     self.path.lineTo(event.pos()) 
     self.newPoint.emit(event.pos()) 
     self.update() 

    def sizeHint(self): 
     return QSize(400, 400) 


class MyWidget(QWidget): 

    def __init__(self, parent=None): 
     QWidget.__init__(self, parent) 
     self.setLayout(QVBoxLayout()) 
     label = QLabel(self) 
     drawer = Drawer(self) 
     drawer.newPoint.connect(lambda p: label.setText(
         'Coordinates: (%d : %d)' % (p.x(), p.y()))) 
     self.layout().addWidget(label) 
     self.layout().addWidget(drawer) 


app = QApplication(sys.argv) 
widget = MyWidget() 
widget.show() 

sys.exit(app.exec_())