Using Vector engines

Using Vector Engines

Start with the project you created in Using the Camera.

Take the following steps to add support for viewing vector drawing in different vector engines:

1.	Click the ResourceView tab in the Project Workspace. Double click IDR_MENU1 and add the following menu structure:

&Engine
     &GDI with ID = IDM_ENGINE_GDI
     &OpenGL with ID = IDM_ENGINE_OPENGL
     &DirectX with ID = IDM_ENGINE_DIRECTX

2.	Click the FileView tab in Project Workspace again and go to Vecaut.c. Add these lines right after the return 0L; statement of case IDM_FILE_EXIT for WM_COMMAND:

case IDM_ENGINE_GDI:
   // re-attach vector using GDI engine.
   L_VecAttachToWindow ( hWnd, &Vector, VECTOR_ENGINE_GDI, VECTOR_ENGINE_DOUBLEBUFFER );
   L_VecSetPolygonMode ( &Vector, VECTOR_POLYGON_LINE );
   L_VecSetUseLights ( &Vector, FALSE );
   ResetView( hWnd, &Vector );
   break;

case IDM_ENGINE_OPENGL:
   // re-attach vector using OpenGL engine.
   L_VecAttachToWindow( hWnd, &Vector, VECTOR_ENGINE_OPENGL, VECTOR_ENGINE_DOUBLEBUFFER );
   L_VecSetPolygonMode( &Vector, VECTOR_POLYGON_FILL );
   L_VecSetUseLights( &Vector, TRUE );
   L_VecSetAmbientColor ( &Vector, RGB( 0x3F, 0x3F, 0x3F ) );
   ResetView( hWnd, &Vector );
   break;

case IDM_ENGINE_DIRECTX:
   // re-attach vector using DirectX engine.
   L_VecAttachToWindow ( hWnd, &Vector, VECTOR_ENGINE_DIRECTX, VECTOR_ENGINE_DOUBLEBUFFER );
   L_VecSetPolygonMode ( &Vector, VECTOR_POLYGON_FILL );
   L_VecSetUseLights ( &Vector, TRUE );
   L_VecSetAmbientColor( &Vector, RGB( 0x3F, 0x3F, 0x3F ) );
   ResetView( hWnd, &Vector );
   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.	You should be able now to select different vector engines and see the effect of how the drawing is painted on the window.