Hello,

I was trying to implement a design using Graphics View/Scene method. I am seeing a lot of time being consumed in QGraphicsView::setScene
To reproduce in a QT known code,
I changed the chip demo as follows mainwindow.cpp
93c93
< for (int i = -11000; i < 11000; i += 110) {
---
> for (int i = -110000; i < 110000; i += 110) {
96c96
< for (int j = -7000; j < 7000; j += 70) {
---
> for (int j = -70000; j < 70000; j += 70) {
98,99c98,99
< qreal x = (i + 11000) / 22000.0;
< qreal y = (j + 7000) / 14000.0;
---
> qreal x = (i + 110000) / 22000.0;
> qreal y = (j + 70000) / 14000.0;

I made the data much bigger. Now, I see the following stack:
#0 0x0000000000981a3f in qt_closestItemFirst ()
#1 0x000000000095ab58 in QAlgorithmsPrivate::qSortHelper<QList<QGraphicsIte m*>::iterator, QGraphicsItem*, bool (*)(QGraphicsItem const*, QGraphicsItem const*)> ()
#2 0x000000000095abf3 in QAlgorithmsPrivate::qSortHelper<QList<QGraphicsIte m*>::iterator, QGraphicsItem*, bool (*)(QGraphicsItem const*, QGraphicsItem const*)> ()
#3 0x000000000095abf3 in QAlgorithmsPrivate::qSortHelper<QList<QGraphicsIte m*>::iterator, QGraphicsItem*, bool (*)(QGraphicsItem const*, QGraphicsItem const*)> ()
#4 0x000000000095abf3 in QAlgorithmsPrivate::qSortHelper<QList<QGraphicsIte m*>::iterator, QGraphicsItem*, bool (*)(QGraphicsItem const*, QGraphicsItem const*)> ()
#5 0x000000000095abf3 in QAlgorithmsPrivate::qSortHelper<QList<QGraphicsIte m*>::iterator, QGraphicsItem*, bool (*)(QGraphicsItem const*, QGraphicsItem const*)> ()
#6 0x000000000095abf3 in QAlgorithmsPrivate::qSortHelper<QList<QGraphicsIte m*>::iterator, QGraphicsItem*, bool (*)(QGraphicsItem const*, QGraphicsItem const*)> ()
#7 0x000000000095abf3 in QAlgorithmsPrivate::qSortHelper<QList<QGraphicsIte m*>::iterator, QGraphicsItem*, bool (*)(QGraphicsItem const*, QGraphicsItem const*)> ()
#8 0x0000000000985fdc in QGraphicsSceneBspTreeIndexPrivate::sortItems ()
#9 0x0000000000986ab9 in QGraphicsSceneBspTreeIndex::items ()
#10 0x00000000009677aa in QGraphicsScene::items ()
#11 0x0000000000968f5e in QGraphicsScene::itemsBoundingRect ()
#12 0x0000000000969167 in QGraphicsScene::sceneRect ()
#13 0x00000000009928d2 in QGraphicsView::sceneRect ()
#14 0x000000000099293a in QGraphicsViewPrivate::recalculateContentSize ()
#15 0x0000000000993a6c in QGraphicsView::setScene ()
#16 0x0000000000431607 in MainWindow::MainWindow ()
#17 0x0000000000431297 in main ()

Any ideas on what I am doing wrong? I am using qt-everywhere-opensource-src-4.6.1

Thanks -- RK