Any Qt Shape Widgets packages?

Hi, all:

I'm just wondering is there any open packages I can use directly:

1) Shape class ---- better 2D and 3D
a) drag any shape into a QGraphicsView ( I did it already)
b) drag and click/select for some specific shapes: for example, for a line2d, I can drag the line ends to wherever I want to drop. for an circle, I can drag to change the radius; for a rectangle, I can drag to change the width and height, etc.


Particularly for Shape class, I'm so expecting to avoid writing everything from scratch by my own. I guess there must be some open staffs already. Can anybody give me some hints?


Cheers
Pei