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並前往https://fiona.dmcs.pl/mjp2/qt-tutorial/docs/qt/opengl-2dpainting-glwidget-cpp.html

glwidget.cpp Example File (opengl/2dpainting/glwidget.cpp)

... helper(helper) { elapsed = 0; setFixedSize(200, 200); } void GLWidget::animate() { elapsed = (elapsed + qobject_cast<QTimer*>(sender())->interval()) ...

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查詢 「QTimer elapsed」的人也找了：

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