To add support for the camera:
Start with the project you created in Transformation.
Add this local variable under L_INT nRet; in the WndProc function:
VECTORCAMERA Camera;
Add these lines right after the break; statement of case '-': in WM_CHAR:
case 'b':
case 'B':
// flip camera projection between parallel and perspective
L_VecGetCamera ( &Vector, &Camera );
Camera.bPerspective = !Camera.bPerspective;
L_VecSetCamera ( &Vector, &Camera );
InvalidateRect( hWnd, NULL, FALSE );
break;
case 'T':
case 't':
// rotate the camera theta angle
L_VecGetCamera( &Vector, &Camera );
Camera.Theta += 5.0;
L_VecSetCamera( &Vector, &Camera );
InvalidateRect( hWnd, NULL, FALSE );
break;
case 'P':
case 'p':
// rotate the camera phi angle
L_VecGetCamera ( &Vector, &Camera );
Camera.Phi += 5.0;
L_VecSetCamera ( &Vector, &Camera );
InvalidateRect( hWnd, NULL, FALSE );
break;
Compile and run the demo.
Select File/Open from the program menu. Browse to c:\lead\images\random.dxf and click OK.
Now you should be able to rotate the camera using the T and P keys on your keyboard, flip projection between parallel and perspective using the B key.