<p>你必须用名字</p>
<pre><code>def paintEvent(self, event):
</code></pre>
<p>而不是<code>def paintCircle(self):</code>在需要时自动运行它。</p>
<pre><code>from PyQt4 import QtCore, QtGui, Qt
from PyQt4.QtGui import QApplication, QMainWindow
import sys
class Ui_MainWindow(object):
def setupUi(self, MainWindow):
MainWindow.resize(500, 500)
self.centralwidget = QtGui.QWidget(MainWindow)
self.horizontalLayout = QtGui.QHBoxLayout(self.centralwidget)
MainWindow.setCentralWidget(self.centralwidget)
self.menubar = QtGui.QMenuBar(MainWindow)
self.menubar.setGeometry(QtCore.QRect(0, 0, 500, 22))
MainWindow.setMenuBar(self.menubar)
self.statusbar = QtGui.QStatusBar(MainWindow)
MainWindow.setStatusBar(self.statusbar)
QtCore.QMetaObject.connectSlotsByName(MainWindow)
class MyMainScreen(QMainWindow):
def __init__(self, parent=None):
QtGui.QMainWindow.__init__(self, parent)
self.ui = Ui_MainWindow() # This is from a python export from QtDesigner
self.ui.setupUi(self)
def paintEvent(self, event):
self.ui.centralwidget.painter = QtGui.QPainter()
self.ui.centralwidget.painter.begin(self)
self.ui.centralwidget.painter.setPen(QtGui.QPen(QtCore.Qt.red))
self.ui.centralwidget.painter.drawArc(QtCore.QRectF(250, 250, 10, 10), 0, 5760)
self.ui.centralwidget.painter.end()
if __name__ == "__main__":
app = QApplication(sys.argv)
mainscreen = MyMainScreen()
mainscreen.show()
app.exec_()
</code></pre>
<hr/>
<p>示例<a href="https://github.com/furas/python-examples/tree/master/pyqt/draw-on-canvas" rel="nofollow noreferrer">draw on canvas</a></p>