QGraphicsItemAnimation and QTimeLine

[babu198649]

hi
the following code works .
but how does the for loop is executed after timer has started(after the for loop the timer is started)

#include <QtGui>
 
int main(int argc, char *argv[])
{
	QApplication a(argc, argv);
	QGraphicsItem *ball = new QGraphicsEllipseItem(0, 0, 20, 20);
 
	QTimeLine *timer = new QTimeLine(5000);
	timer->setFrameRange(0, 100);
 
	QGraphicsItemAnimation *animation = new QGraphicsItemAnimation;
	animation->setItem(ball);
	animation->setTimeLine(timer);
 
	for (int i = 0; i < 200; ++i)
		animation->setPosAt(i / 200.0, QPointF(i, i));
 
	QGraphicsScene *scene = new QGraphicsScene();
	scene->setSceneRect(0, 0, 250, 250);
	scene->addItem(ball);
 
	QGraphicsView *view = new QGraphicsView(scene);
	view->show();
 
	timer->start();
	return a.exec();
}

#include <QtGui>

int main(int argc, char *argv[])
{
	QApplication a(argc, argv);
	QGraphicsItem *ball = new QGraphicsEllipseItem(0, 0, 20, 20);

	QTimeLine *timer = new QTimeLine(5000);
	timer->setFrameRange(0, 100);

	QGraphicsItemAnimation *animation = new QGraphicsItemAnimation;
	animation->setItem(ball);
	animation->setTimeLine(timer);

	for (int i = 0; i < 200; ++i)
		animation->setPosAt(i / 200.0, QPointF(i, i));

	QGraphicsScene *scene = new QGraphicsScene();
	scene->setSceneRect(0, 0, 250, 250);
	scene->addItem(ball);

	QGraphicsView *view = new QGraphicsView(scene);
	view->show();

	timer->start();
	return a.exec();
}

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