用圆形区域剪辑文本

Question

如何制作内含文字的透明椭圆或用文字替换椭圆边框？

用边框替换文本

ellipse = QPainter(self)
ellipse.setOpacity(0.6)
ellipse.setPen(QtGui.QPen(Qt.darkGreen, 4, Qt.DashLine))    # Any way to replace 'DashLine with Text ?'
ellipse.setBrush(QBrush(QColor(self.window_bg), Qt.SolidPattern))
ellipse.drawEllipse(0, 0, self.ellipse_width, self.ellipse_height)

椭圆内的文字

ellipse = QPainter(self)
ellipse.setOpacity(0.6)
ellipse.setBrush(QBrush(QColor('#000000'), Qt.SolidPattern))
ellipse.drawEllipse(0, 0, 300, 300)
ellipse.drawText(10, 10, 'Random Text')

Answer 1

你必须使用setClipPath():

import random
from PyQt5 import QtCore, QtGui, QtWidgets

class MainWindow(QtWidgets.QMainWindow):
    def paintEvent(self, event):
        window_bg = "#0011ff"
        ellipse_width, ellipse_height = self.width(), self.height()
        r = QtCore.QRectF(0, 0, ellipse_width, ellipse_height)
        text = "Stack OverFlow :-)"

        path = QtGui.QPainterPath()
        path.addEllipse(r)

        painter = QtGui.QPainter(self)
        painter.setRenderHint(QtGui.QPainter.Antialiasing)
        painter.setClipPath(path, QtCore.Qt.IntersectClip)
        painter.setOpacity(0.6)
        painter.setBrush(QtGui.QBrush(QtGui.QColor('#000000'), QtCore.Qt.SolidPattern))
        painter.setPen(QtGui.QPen(QtCore.Qt.darkGreen, 4, QtCore.Qt.DashLine))    
        painter.setBrush(QtGui.QBrush(QtGui.QColor(window_bg), QtCore.Qt.SolidPattern))
        painter.drawEllipse(r)

        # draw text in random positions
        for i in range(100):
            x = random.randint(0, self.width())
            y = random.randint(0, self.height())
            painter.drawText(x, y, text)


if __name__ == '__main__':
    import sys
    app = QtWidgets.QApplication(sys.argv)
    w = MainWindow()
    w.resize(640, 480)
    w.show()
    sys.exit(app.exec_())