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 "Resource View" tab of the project workspace.
2.	Click to open the "tutorial resources" branch.
3.	Click to open the "Menu" branch.
4.	Double-click "IDR_MAINFRAME".
5.	Create an "Engine" menu item and check the "Pop-up" check box.
6.	Create this Menu structure under the Engine Menu item:

& GDI with ID = ID_ENGINE_GDI

&OpenGL with ID = ID_ENGINE_OPENGL

7.	Drag the "Engine" menu item so that it appears immediately after the "Edit" menu item.
8.	Choose View->Class Wizard...
9.	Under the Class Name drop down box, select "CTutorialDoc".
10.	Under the Object IDs drop down box, select ID_ENGINE_GDI.
11.	Under the Messages drop down box, Select COMMAND.
12.	Click the "Add Function" button and then the "OK" button.
13.	Select the UPDATE_COMMAND_UI message.
14.	Click the "Add Function" button and then the "OK" button.
15.	Repeat steps 10 through 14 for the Object ID ID_ENGINE_OPENGL.
16.	Click the "Edit Code" button.
17.	Add the following code for the six new functions:

void CTutorialDoc::OnEngineGdi()
{
   m_pVectorWindow->SetEngine (VECTOR_ENGINE_GDI);
}

void CTutorialDoc::OnUpdateEngineGdi(CCmdUI* pCmdUI)
{
   pCmdUI->SetCheck(m_pVectorWindow->GetEngine () == VECTOR_ENGINE_GDI);
}

void CTutorialDoc::OnEngineOpengl()
{
   m_pVectorWindow->SetEngine (VECTOR_ENGINE_OPENGL);
}

void CTutorialDoc::OnUpdateEngineOpengl(CCmdUI* pCmdUI)
{
   pCmdUI->SetCheck(m_pVectorWindow->GetEngine () == VECTOR_ENGINE_OPENGL);
}

18.	Compile and run the demo.
19.	From the program menu, browse to the "images" folder of your LEAD installation. Open the image random.dxf and click OK.
20.	Select different vector engines and see the effect of how the drawing is painted on the window.