[英]Integrating QPainter in PyQt GUI
我正在尝试在一个布局中使用 QPainter 制造的 object 以及 PyQt 的本机小部件,但这样做有困难。
我尝试使用addWidget()
将其添加到布局中,但没有运气。
class window(QWidget):
def __init__(self):
super().__init__()
self.resize(600, 500)
self.setWindowTitle('GUI 2.0')
#LCD
self.lcd = QLCDNumber()
self.lcd.setFixedHeight(100)
#Slider
self.slider = QSlider(Qt.Horizontal)
self.slider.setMaximum(40)
self.slider.setMinimum(0)
self.slider.valueChanged.connect(self.progress)
#Push button
pb = QPushButton('Button', self)
pb.clicked.connect(self.button)
#Progress Bar
self.pbar = QProgressBar(self)
self.pbar.setGeometry(30, 40, 200, 25)
self.pbar.setTextVisible(False)
#Qpainter
painter = QPainter()
painter.setPen(QPen(Qt.black, 5, Qt.SolidLine))
painter.setBrush(QBrush(Qt.green, Qt.DiagCrossPattern))
painter.drawRect(100, 15, 400,200)
#Grid Layout
layout = QGridLayout()
layout.addWidget(self.lcd, 1, 1)
layout.addWidget(self.slider, 2, 1)
layout.addWidget(pb, 2, 2)
layout.addWidget(self.pbar, 0, 1)
layout.addWidget(painter) # doesn't work!
self.setLayout(layout)
我的目标是这样的,slider 最终会改变水箱中的水位,按钮将重置 slider 值并因此清空水箱:
而我有这样的事情:
如何将画家 object 添加到布局中?
QPainter 不是一个小部件,而只是在设备上绘画(QWidget、QImage、QPixmap 等),因此在您的情况下,您必须创建一个自定义小部件,在 paintEvent 方法中绘制坦克
from PyQt5 import QtCore, QtGui, QtWidgets
class TankWidget(QtWidgets.QWidget):
progressChanged = QtCore.pyqtSignal(float)
def __init__(self, parent=None):
super().__init__(parent)
self._progress = 0.0
@QtCore.pyqtProperty(float, notify=progressChanged)
def progress(self):
return self._progress
@progress.setter
def progress(self, p):
if 0 <= p <= 1.0:
self._progress = p
self.progressChanged.emit(p)
self.update()
def paintEvent(self, event):
painter = QtGui.QPainter(self)
height = self.progress * self.height()
r = QtCore.QRect(0, self.height() - height, self.width(), height)
painter.fillRect(r, QtGui.QBrush(QtCore.Qt.blue))
pen = QtGui.QPen(QtGui.QColor("red"), 10)
painter.setPen(pen)
painter.drawRect(self.rect())
def sizeHint(self):
return QtCore.QSize(100, 100)
class Widget(QtWidgets.QWidget):
def __init__(self):
super().__init__()
self.resize(600, 500)
self.setWindowTitle("GUI 2.0")
self.tank = TankWidget()
self.progressbar = QtWidgets.QProgressBar()
self.lcd = QtWidgets.QLCDNumber()
self.lcd.setFixedHeight(100)
self.slider = QtWidgets.QSlider(QtCore.Qt.Horizontal, maximum=101)
self.button = QtWidgets.QPushButton("Button")
self.slider.valueChanged.connect(self.on_value_changed)
lay = QtWidgets.QGridLayout(self)
lay.addWidget(self.tank, 0, 0, 2, 1)
lay.addWidget(QtWidgets.QLabel("Tank", alignment=QtCore.Qt.AlignCenter), 2, 0)
lay.addWidget(self.progressbar, 0, 1)
lay.addWidget(self.lcd, 1, 1)
lay.addWidget(self.slider, 2, 1)
lay.addWidget(
QtWidgets.QLabel(
pixmap=QtGui.QPixmap("warning.png"), alignment=QtCore.Qt.AlignCenter
),
0,
2,
2,
1,
)
lay.addWidget(self.button, 2, 2)
self.setFixedHeight(self.sizeHint().height())
self.slider.setValue(40)
@QtCore.pyqtSlot()
def on_value_changed(self):
progress = self.slider.value() * 1.0 / self.slider.maximum()
self.tank.progress = progress
self.progressbar.setValue(self.slider.value())
self.lcd.display(self.slider.value())
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
w = Widget()
w.show()
sys.exit(app.exec_())
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