Creating an Empty Vector
Take the following steps to start a project and to add some code that creates a new empty vector handle, and attaches it to a window.
Note: |
This example is for a 32-bit (NT or Windows 9x) environment. |
1. |
Start Visual C++, version 2005. |
2. |
Select the File->New->Project menu option |
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In the New Project dialog box, make sure to select "Visual C++" à "MFC" from the tree on the left of the dialog, and select "MFC Application" as the project template. |
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Give the project the name "Tutorial" and make sure to allocate your project under the following folder LEAD Technologies\LEADTOOLS 15\Examples\ClassLibrary\MSVC folder, then click OK. |
3. |
In the first wizard dialog, click "Next". |
4. |
In the next step, choose Single Document and click "Finish". |
5. |
From the main menu, choose Project->Properties |
6. |
In the "Configuration Properties" node, choose "C/C++", then "General". |
7. |
In the "Additional include directories" dialog box, enter the include\classlib directory of your LEADTOOLS installation. For example, if you installed LEADTOOS in c:\ltwin14x, enter c:\ltwin14x\include\classlib. |
8. |
Open TutorialDoc.h. |
9. |
Add the following line immediately before the class CTutorialDoc declaration: |
#include "ltwrappr.h"
10. |
Click on the "Class View" tab. |
11. |
Click to open the Tutorial Classes branch. |
12. |
Click "CTutorialApp", and then double click the CTutorialApp() constructor. |
13. |
Add the following lines after "//TODO: add construction code here": |
LSettings::LoadLibraries (LT_KRN|LT_FIL|LV_KRN|LV_DLG);
LSettings::UnlockSupport (L_SUPPORT_VECTOR, L_KEY_VECTOR);
14. |
In the "Solution Explorer", right-click your project "tutorial" and select "Add" à "New Item", and add a new CPP file and name it "Imports.cpp". |
15. |
Add the following code to "Imports.cpp" you just created (note, you may have to change the paths to match your LEADTOOLS installation folder): |
#include "stdafx.h"
#if defined(WIN64)
#pragma comment( lib, "..\\..\\..\\..\\..\\Lib\\API\\x64\\ltwvc_x.lib")
#else
#pragma comment( lib, "..\\..\\..\\..\\..\\Lib\\API\\Win32\\ltwvc_u.lib ")
#endif
16. |
Click on the "Class View" tab. |
17. |
Right click "CTutorialDoc" and select "Add Variable..." |
18. |
For Variable Type enter LVectorWindow*, and for Variable name enter m_pVectorWindow. Leave Access as "Public" and click Finish. |
19. |
Click on the CTutorialDoc tree view branch, and double click the CTutorialDoc() constructor. Add the lines: |
m_pVectorWindow = new LVectorWindow;
m_pVectorWindow->SetBackgroundColor (RGB(255, 255, 255));
20. |
In the destructor, add the line: |
delete m_pVectorWindow;
21. |
In the ClassView, select the CTutorialView, in the Properties window select Messages shortcut, then select the WM_CREATE. |
22. |
Code the CTutorialView::OnCreate() function as follows: |
int CTutorialView::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
if (CView::OnCreate(lpCreateStruct) == -1)
return -1;
L_INT nRet = SUCCESS;
nRet = GetDocument()->m_pVectorWindow->SetWndHandle (m_hWnd);
if(nRet!=SUCCESS)
{
LBase::DisplayErrorFromList ();
return -1;
}
else
{
GetDocument()->m_pVectorWindow->AttachToWindow (m_hWnd);
}
return 0;
}
22. |
Modify CTutorialDoc::OnNewDocument() to create a new vector with an empty vector layer. The function should look like this: |
BOOL CTutorialDoc::OnNewDocument()
{
if (!CDocument::OnNewDocument())
return FALSE;
//Empty the vector of all objects and layeres
m_pVectorWindow->Empty ();
//Create an empty vector layer layer
VECTORLAYERDESC VectorLayerDesc;
VectorLayerDesc.nSize = sizeof(VECTORLAYERDESC);
lstrcpy(VectorLayerDesc.szName, TEXT("First Layer"));
VectorLayerDesc.bVisible = TRUE;
VectorLayerDesc.bLocked = FALSE;
VectorLayerDesc.dwTag = 0;
LVectorLayer MyLayer(&VectorLayerDesc);
m_pVectorWindow->AddLayer (&MyLayer);
m_pVectorWindow->SetActiveLayer (&MyLayer);
m_pVectorWindow->Reset ();
return TRUE;
}
23. |
Compile and run the project by selecting Build->Execute tutorial.exe from the menu. The program should display a white background drawn by the vector handle. |