Qt：在QOpenGLWidget中的文本呈现

问题描述

我想在QOpenGLWidget上绘制文本标签。我试图使用QPainter这个任务，但没有成功 - 文本看起来丑陋和非抗锯齿。它也看起来丑陋的Qt OpenGL / 2dpainting样本。然而，文本渲染在使用OpenGL后端的QML控件中显着更好。这里我发现了一种用于QML的技术。有没有办法使用这种技术来绘制文本在QOpenGLWidget？

I want to draw text labels on QOpenGLWidget. I tried to use QPainter for this task, but had no success - text looks ugly and non antialiased. It is also looks ugly in Qt OpenGL/2dpainting samples. However text rendering is significantly better in QML controls which also use OpenGL backend. Here http://blog.qt.io/blog/2011/07/15/text-rendering-in-the-qml-scene-graph/ I have found a technique that is used in QML. Is there a way to use that technique to draw text in QOpenGLWidget?

PS：可能是正确的方法是将所有我的场景嵌入QSGSceneGraph的QQuickWidget？ / p>

PS: May be the right way to go is to embed all my scene inside QSGSceneGraph of QQuickWidget?

推荐答案

确保您创建的QGL / QopenGLWidget的表面格式支持多重采样的抗锯齿：

Make sure you create your QGL/QopenGLWidget with a surface format that supports multisampling for antialiasing:

QSurfaceFormat format = QSurfaceFormat::defaultFormat();
format.setSamples(4);
QOpenGLWidget * glWidget = new QOpenGLWidget;
glWidget->setFormat(format);

然后，当在该小部件上使用QPainter时，请确保打开抗锯齿：

Then, when using a QPainter on that widget, make sure you turn on antialiasing:

QPainter painter(paintDevice);
painter.setRenderHints(QPainter::Antialiasing | QPainter::TextAntialiasing);

然后绘制您的文字。

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