LVectorBase::HitTest

#include "ltwrappr.h"

virtual L_INT LVectorBase::HitTest(pPoint, ppVectorObject)

const POINT *pPoint;	/* pointer to a POINT structure */
pVECTOROBJECT *ppVectorObject;	/* pointer to a structure */

Gets the vector object under the specified 2D point.

Parameter	Description
pPoint	Pointer to a POINT structure that contains the point to test.
ppVectorObject	Pointer to a VECTOROBJECTstructure to be updated with the object present at the specified location.

Returns

SUCCESS	The function was successful.
< 1	An error occurred. Refer to Return Codes.

Comments

This function will get the first object under the specified physical point.

Camera, view port, rotation, translation and scaling are all considered when determining whether or not an object is under the specified point.

This function is not supported in the DirectX engine.

Required DLLs and Libraries

LVKRN

For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application.

See Also

Functions:

LVectorBase::IsObjectSelected, LVectorBase::DeleteObject

Example

This example will delete the object under a given 2D point.

L_INT LVectorBase__HitTestExample(HWND hWnd, LVectorBase *pVector, LPPOINT pPoint)
{
   UNREFERENCED_PARAMETER(hWnd);
   L_INT          nRet;
   LVectorBase    Vector;
   LVectorObject  VectorObject;
   VECTORHITTEST  HitTest;
   L_TCHAR        szMsg[200];
   //Get current Hit Test settings
   nRet = Vector.GetHitTest(&HitTest);
   if(nRet != SUCCESS)
      return nRet;
   wsprintf(szMsg, TEXT("Old Hit Test Settings\nDistance[%d]\ndwFlags[%d]"), HitTest.nDistance, HitTest.dwFlags);
   MessageBox(NULL, szMsg, TEXT(""), MB_OK);
   HitTest.nDistance = 8;
   nRet = Vector.SetHitTest(&HitTest);
   if(nRet != SUCCESS)
      return nRet;
   wsprintf(szMsg, TEXT("New Hit Test Settings\nDistance[%d]\ndwFlags[%d]"), HitTest.nDistance, HitTest.dwFlags);
   MessageBox(NULL, szMsg, TEXT(""), MB_OK);
   // Get object under that point 
   nRet = pVector->HitTest(pPoint, &VectorObject);
   if(nRet != SUCCESS)
      return nRet;
   //Is there an object under that point? If yes, delete it
   if (nRet == SUCCESS)
   {
      MessageBox(NULL, TEXT("Deleting Object..."), TEXT(""), MB_OK);
      nRet = VectorObject.DeleteObject();
      if(nRet != SUCCESS)
         return nRet;
   }
   else
      return nRet;
   //LVectorObject destructor called when VectorObject goes out of scope...
   return SUCCESS;
}