Qt 画布绘制器示例和教程

Qt Canvas Painter - Compact Health Example	演示如何在 QWindow 中使用 QCanvasPainter。
Qt Canvas Painter - Gallery Example	演示Qt Quick 应用程序中的 QCanvasPainter 功能。
Qt Canvas Painter - Hello Widget Example	演示如何使用 QCanvasPainter 和 QCanvasPainterWidget。

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