Details
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Bug
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Resolution: Unresolved
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P4: Low
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None
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5.12.3
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None
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Windows
Description
When draw 2D with QPainter on QOpenGLWidget, the QPainter coordinate act as translate(-1,0). The x=0 position always invisible.
Take 'Examples\Qt-x.x.x\opengl\2dpainting' for example:
1, disable QPainter::Antialiasing
void GLWidget::paintEvent(QPaintEvent *event)
{
QPainter painter;
painter.begin(this);
//painter.setRenderHint(QPainter::Antialiasing);
helper->paint(&painter, event, elapsed);
painter.end();
}
void Widget::paintEvent(QPaintEvent *event)
{
QPainter painter;
painter.begin(this);
//painter.setRenderHint(QPainter::Antialiasing);
helper->paint(&painter, event, elapsed);
painter.end();
}
2, Change Helper::Paint event:
void Helper::paint(QPainter *painter, QPaintEvent *event, int elapsed)
{
painter->setPen(Qt::red);
painter->fillRect(event->rect(), Qt::gray);
painter->drawRect(event->rect());
}
Then you will get the result:
