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//! [0]
QPrinter pr;
if (pr.setup()) {
QPainter p(&pr);
canvas.drawArea(canvas.rect(), &p);
}
//! [0]
//! [1]
void MyCanvasView::contentsMousePressEvent(QMouseEvent* e)
{
Q3CanvasItemList l = canvas()->collisions(e->pos());
for (Q3CanvasItemList::Iterator it=l.begin(); it!=l.end(); ++it) {
if ((*it)->rtti() == Q3CanvasRectangle::RTTI)
qDebug("A Q3CanvasRectangle lies somewhere at this point");
}
}
//! [1]
//! [2]
QMatrix wm;
wm.scale(2, 2); // Zooms in by 2 times
wm.rotate(90); // Rotates 90 degrees counter clockwise
// around the origin.
wm.translate(0, -canvas->height());
// moves the canvas down so what was visible
// before is still visible.
myCanvasView->setWorldMatrix(wm);
//! [2]
//! [3]
QRect rc = QRect(myCanvasView->contentsX(), myCanvasView->contentsY(),
myCanvasView->visibleWidth(), myCanvasView->visibleHeight());
QRect canvasRect = myCanvasView->inverseWorldMatrix().mapRect(rc);
//! [3]
//! [4]
Q3CanvasItem* item;
// Find an item, e.g. with Q3CanvasItem::collisions().
...
if (item->rtti() == MySprite::RTTI) {
MySprite* s = (MySprite*)item;
if (s->isDamagable()) s->loseHitPoints(1000);
if (s->isHot()) myself->loseHitPoints(1000);
...
}
//! [4]
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