Using the Camera

To add support for the camera

Start with the project you created in Transformation.

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:\LEADTOOLS22\Resources\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.