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Grabbing all QGraphicItems current viewable in a QGraphicView
The best way to get a list of all items current displayed inside the QGraphicsView is done through the combination of three steps:
get viewing rectangle
get items intersecting or inside rectangle
check for visibility
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QList<QGraphicsItem* > viewItems = m_pView->items(m_pView->rect());
for(int i=0; i < viewItems.size(); ++i) {
if(viewItems.at(i)->isVisible()) {
//payload
}
}
Do not use other rectangle functions like sceneRect(), childrenRect(), contentsRect(), etc… as they [...] [Read full arcticle]
Qt mousePressEvent and mouseReleaseEvent fun!
This would have been good to know beforehand regarding mouse events…
Apparently in Qt, QGraphicsItem’s mouse events are a little different from the model I had in my head from Actionscript. In actionscript when a user uses the mouse to move over and then click on an MovieClip object these events occur (ignoring mouse movement events):
onRollOver
onPress
onRelease
onRollOut
In [...] [Read full arcticle]
Making a QPixmap transparent the Right Way
The Problem
The classic situation that this problem can occur is when one wants to create a QPixmap with a transparent background and then draws on only some of the available pixels. This process is akin to creating a transparent GIF. Well there is a wrong way and a right way. I discovered this because I [...] [Read full arcticle]