[Qt-interest] Regarding polygons and mouse events

[Mahendra G.R]

Hello all,

I have a (another) problem now, i managed to move polygon inside a scene
using Qgraphicsscene.  Now i have multiple polygons in the scene, i want to
move the polygons inside the scene.  For example if i have blue/green
polygons, i want move them indiviually, my implementation does this for ONE
polygon, even if i i have two polygons in the scene, whenever i click the
second polygon, only the first polygon moves and the other stays idle all
the time.  I have attached my code, any help will be really useful, i've
almost gave up on this bug..


----------------------



void CustomScene::mouseReleaseEvent ( QGraphicsSceneMouseEvent * event )
{

        QTextStream out(stdout);
        out <<"Mouse released "<<endl;

        double mousePosX;
        double mousePosY;

        mousePosX = (double) event->scenePos().x();
        mousePosY = (double) event->scenePos().y();
        out <<mousePosX<<" "<<mousePosY<<endl;

        QPolygonF tempPoly;

        QGraphicsPolygonItem *tempItem;

        tempItem =
(QGraphicsPolygonItem*)this->itemAt(event->scenePos().x(),event->scenePos().y());

        if (tempItem == 0)
        {
            out<<"Item not found  "<<endl;
            return;

        }
        tempPoly = tempItem->polygon();
        //tempPoly1 = tempItem1->polygon();


        QPointF p1,p2,p3,p4;
        p1 = tempPoly.at(0);
        p1 = tempItem->mapToParent(p1);
        p2 = tempPoly.at(1);
        p2 = tempItem->mapToParent(p2);
        p3 = tempPoly.at(2);
        p3 = tempItem->mapToParent(p3);
        p4 = tempPoly.at(3);
        p4 = tempItem->mapToParent(p4);

        out <<"p1: "<<p1.x()<<" "<<p1.y()<<endl
            <<"p2 : "<<" "<<p2.x()<<" "<<p2.y()<<endl
            <<"p3 : "<<" "<<p3.x()<<" "<<p3.y()<<endl
            <<"p4 : "<<" "<<p4.x()<<" "<<p4.y()<<endl;

}
----------------

I tried with mousePressEvent, but then i cant move the polygons at all!!,
this is the best possible way i could do it (or am i missing something??)


-- 
http://www.mahendragr.com
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