Python 设置画师背景
大家好,我正在使用QPainter和鼠标事件,我想将QPainter的背景设置为黑色。我使用了此代码,但不起作用,谢谢Python 设置画师背景,python,pyqt5,Python,Pyqt5,大家好,我正在使用QPainter和鼠标事件,我想将QPainter的背景设置为黑色。我使用了此代码,但不起作用,谢谢 class Drawer(QWidget): newPoint = pyqtSignal(QPoint) def __init__(self, parent=None): QWidget.__init__(self, parent) self.path = QPainterPath() def paintEve
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)
如果你只是想得到一个黑色的背景,你可以在没有paintEvent的情况下得到它
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_())
更改painter.setBackgroundpainter,bbrush到painter.setbackgroundbbrush谢谢你,但是仍然没有工作。事实上,我有这样的完整代码:我不明白你想做什么,只是注释,因为setBackgound方法不需要QPainter。我不明白你想要什么,你可以展示一个你得到的图像和另一个你想要的图像。你在这里解释的代码的结果我只想将QPainter背景设置为黑色我不明白你所说的背景是什么意思,你是指小部件的底部?
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_())