在 QGLWidget 上使用 QPainter 时，启用抗锯齿需要哪些步骤? [英] What steps are necessary to enable antialiasing when using a QPainter on a QGLWidget?

问题描述

我正在尝试在 QGLWidget 上绘制基本形状.我正在尝试启用抗锯齿来平滑线条，但它不起作用.

I am trying to draw basic shapes on a QGLWidget. I am trying to enable antialiasing to smooth out the lines, but it is not working.

这就是我目前正在尝试的:

This is what I am trying at the moment:

QGLWidget *widget = ui->renderWidget;

QPainter painter;

widget->makeCurrent();
glEnable(GL_MULTISAMPLE);
glEnable(GL_LINE_SMOOTH);

painter.setRenderHint(QPainter::Antialiasing);
painter.setRenderHint(QPainter::HighQualityAntialiasing);

painter.begin(widget);

然而，用这个画家画的任何东西仍然有锯齿状的边缘.我还需要做什么?

However, anything drawn with this painter still has jagged edges. What else do I need to do?

推荐答案

我找到了解决方案.在调试不同的问题时，我在调试输出中发现消息，大意是在调用 begin() 之前不能设置渲染提示.

I found the solution. When debugging a different issue, I found messages in my debug output to the effect that you can't set renderhints before the call to begin().

以下工作:

QGLWidget *widget = ui->renderWidget;

QPainter painter;

widget->makeCurrent();
glEnable(GL_MULTISAMPLE);
glEnable(GL_LINE_SMOOTH);

painter.begin(widget);

painter.setRenderHint(QPainter::Antialiasing);
painter.setRenderHint(QPainter::HighQualityAntialiasing);

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