[Qt-interest] Regarding polygons and mouse events

[Mahendra G.R]

Can anyone please check my code, i have attached the whole program, can be
directly compiled.

On Wed, Nov 10, 2010 at 10:33 AM, Mahendra G.R <mahendra at mahendragr.com>wrote:

> 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
>



-- 
http://www.mahendragr.com
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