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並前往https://coderedirect.com/questions/566690/draw-a-line-with-qpainter-using-qgraphicsview-subclass

Draw a line with QPainter using QGraphicsView subclass

Here is a full example using rich text of QTextDocument. mainWindow.cpp: #include "mainWindow.h" void MainWindow::paintEvent(QPaintEvent*) { QPainter painter( ...

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