Using the camera

Using the Camera

Start with the project you created in Transformation.

Take the following steps to support for the camera:

1.	Add this local variable under L_INT nRet; in the WndProc function:

VECTORCAMERA Camera;

2.	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;

3.	Compile and run the demo.
4.	Select File/Open… from the program menu. Browse to c:\lead\images\random.dxf and click OK.
5.	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.