Qpainter function on a QFrame problem

[impeteperry]

I am going back and check my data as I am sure that is where it must be as you suggest, but I would like to know about the "{ Q_ASSERT_X(i >= 0 && i < p.size(),...." message. can it help me find where and what is the problem is?.

I looked at QGraphicsView, as you suggested earlier, but for some reason decided not to go there. I will however do so now and try to make a parallel program to the one I have now.

What I am trying to do as a structural engineer is write a parametric driven program to replace the current CAD programs used in the industry and one that someone can learn to use in a day or two by going back to a modified command line operation similar to one I had written in pre-dos days. I do not have any time restraints, but a need to get it right.

I took a quick look at "graphicsview" and noted it was a 2D program and the program i am trying to re-write was a 3D rendered structure
Thanks for you indulgence

[wysota]

I am going back and check my data as I am sure that is where it must be as you suggest, but I would like to know about the "{ Q_ASSERT_X(i >= 0 && i < p.size(),...." message. can it help me find where and what is the problem is?.

Not really. But a backtrace from a debugger will and I suggest you use one here. There is no point in guessing if the application itself can tell you what is wrong.

I looked at QGraphicsView, as you suggested earlier, but for some reason decided not to go there. I will however do so now and try to make a parallel program to the one I have now.

I really suggest you reconsider using GV. It's perfect for your usecase.

I took a quick look at "graphicsview" and noted it was a 2D program and the program i am trying to re-write was a 3D rendered structure

But you are rendering it on a 2D canvas, so everything is ok. If you want to have real 3D, consider using OpenGL with one of the viewer frameworks available for Qt.

[impeteperry]

Thanks
I am using opengl.

There are 2 parts to the program.
1. developing a library of concrete elements (columns, beams, plank, connection hardware etc.) using opengl.

2. defining where they go.

This in a replacement for conventional CAD! which is prone for errors resulting from a multiplicity of input points for a given item. (floor plan, excavations, wall sections and details);

I layout a set of grids( support lines)
select a level (1st, 2nd, 3rd etc floor, )
place columns from the column library and locate them on grid intersections
place beams from the beam library and locate them by their supporting columns
place plank from the plank library and locate them by their supporting beams

now, if a grid line is moved, the associated columns move, the beam location and spans change, the plank location and spans change.
Now is a change levels, the column length changes etc.

this is all done automatically. Sort of like a "solid modeler" which I had tried.

Sorry to be so verbose, and I thank you for you patients.

[wysota]

Hmm... honestly I don't see anything 3D in the second image you attached to the last post.

[impeteperry]

Hmm... honestly I don't see anything 3D in the second image you attached to the last post.

All right you are getting to me. This is a database that defines the total structure. Any change here changes everything. I am going away for a couple of weeks and try out your recommendations from scratch

Thanks again

[wysota]

Regardless of what the data is meant for, it is displayed as 2D, therefore suits well with the Graphics View architecture.

[impeteperry]

I am already incorporating QGraphicView (trying anyway) into my program.
Thanks again

pete.

[impeteperry]

Thanks for all the help. How do I close this posts so I can use some attachments on another post i want to make