Transformation

Start with the project you created in Vector Tools.

Take the following steps to add scale, rotation and translation to the sample program:

1.	For this tutorial, the VectorWindow must capture and process keystrokes. To process keystrokes, you must derive a class from LVectorWindow and override the MsgProcCallBack().
2.	Click the "Class View" tab in the project workspace.
3.	Right click "tutorial classes" and choose "New Class..."
4.	In the drop down box "Class Type" choose Generic Class.
5.	In the Name dialog box, enter "MyVectorWindow".
6.	In the "Derived From" list box entry, type "LVectorWindow".
7.	A message box appears stating that "The New Class Wizard could not find the appropriate header file(s) to include for the base class(es) LVectorWindow". Click the "OK" button.
8.	Double click the "MyVectorWindow" to open the file "MyVectorWindow.h" and immediately before the class declaration, add the line:

#include "ltwrappr.h".

9.	Double click the "CTutorialDoc" to open "tutorialDoc.h" and immediately before the class declaration, add the line:

#include "MyVectorWindow.h"

10.	Change the definition of *m_pVectorWindow from:

LVectorWindow *m_pVectorWindow;

MyVectorWindow *m_pVectorWindow;

11.	Open the "CTutorialDoc" branch, and double click the CTutorialDoc() constructor. Change the CTutorialDoc() constructor as follows:

CTutorialDoc::CTutorialDoc()
{
m_pVectorWindow = new MyVectorWindow;
m_pVectorWindow->SetBackgroundColor ();
}

12.	Click the Class View tab in the project workspace.
13.	Right-click the class "MyVectorWindow" and choose "Add Member Function..."
14.	Enter LRESULT for the function type.
15.	Enter MsgProcCallBack(HWND hWnd,UINT uMsg,WPARAM wParam,LPARAM lParam) for the function declaration.
16.	Select the "Protected" radio button.
17.	Click OK.
18.	Add the following code to the newly created MsgProcCallBack() member function:

LRESULT MyVectorWindow::MsgProcCallBack(HWND hWnd,UINT uMsg,WPARAM wParam,LPARAM lParam)
{
   VECTORPOINT VecPoint;

   switch (uMsg)
   {
   case WM_CHAR:
      {
         switch( wParam )
         {
         case 'x':
         case 'X':
         case 'y':
         case 'Y':
         case 'z':
         case 'Z':
            // get current rotation value
            GetRotation(&VecPoint);
            VecPoint.x += ( wParam == 'x' || wParam == 'X' ) ? 5.0 : 0;
            VecPoint.y += ( wParam == 'y' || wParam == 'Y' ) ? 5.0 : 0;
            VecPoint.z += ( wParam == 'z' || wParam == 'Z' ) ? 5.0 : 0;

            // set new rotation value
            SetRotation(&VecPoint);
            break;
         }
      }
   }

   return LVectorWindow::MsgProcCallBack ( hWnd, uMsg, wParam, lParam);
}

19.	Compile and run the demo.
20.	Select File/Open… From the program menu, browse to the "images" folder of your LEAD installation. Open the image random.dxf and click OK.
21.	Now you should be able to rotate the vector drawing around any axis using the x, y and z keys on your keyboard.