how to write QT openGL code in two classes

[qtUse]

Ohhhh .....I verified, HelloGL's using QGLWidget only as you said
I tried according to it and it's finely taking GL contexts from calling function

Thanks for your prompt help, tbscope

@second post:
But in order to draw, say car, I need to paint different sides in car drawing class only (to avoid passing all its vertices to single QGLWidget), so GL context must be available to my BuildingPainter class. So I am using multiple OGLWidgets

[tbscope]

I would probably go with the Model and View pattern. The view being the QGLWidget and the model a tree of objects.

Example:

+------------------+
| MyGlModel        |
|                  |
| Rootitem         |      +-------------+
|  |               |      | MyGlView    |
|  +- Item         |      |             |
|  |		   |----->| setModel()  |
|  +- Item         |      |             |
|      |           |      |             |
|      + Item      |      +-------------+
|                  |
+------------------+
 
 
 
 
 
+------------------+      +-------------------+
| MyGlView         |      | MyGlItem          |
|                  |      |                   |
| paintGl()        |      | drawItem(context) |
|  |               |----->|                   |
|  +- iterate      |      |                   |
|     over model   |      +-------------------+
|                  |
+------------------+
 
 
 
void MyGlView::drawGl()
{
    // recursive call each item in the model tree
 
    // For each item:
    item->drawItem(context(), /*maybe other stuff*/);
}
 
void MyGlItem::drawItem(QGLContext *context, /*maybe other things*/)
{
    // Do the GL Painting for this item based on the context.
}

+------------------+
| MyGlModel        |
|                  |
| Rootitem         |      +-------------+
|  |               |      | MyGlView    |
|  +- Item         |      |             |
|  |		   |----->| setModel()  |
|  +- Item         |      |             |
|      |           |      |             |
|      + Item      |      +-------------+
|                  |
+------------------+





+------------------+      +-------------------+
| MyGlView         |      | MyGlItem          |
|                  |      |                   |
| paintGl()        |      | drawItem(context) |
|  |               |----->|                   |
|  +- iterate      |      |                   |
|     over model   |      +-------------------+
|                  |
+------------------+



void MyGlView::drawGl()
{
    // recursive call each item in the model tree

    // For each item:
    item->drawItem(context(), /*maybe other stuff*/);
}

void MyGlItem::drawItem(QGLContext *context, /*maybe other things*/)
{
    // Do the GL Painting for this item based on the context.
}

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