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LVectorBase::IsObjectInsideParallelogram

Summary

Determines whether the specified object(s) is(are) within the specified parallelogram.

Syntax

#include "ltwrappr.h"

virtual L_INT LVectorBase::IsObjectInsideParallelogram(pLeftTop, pRightBottom, bInside, dwFlags=0)

Parameters

const pVECTORPOINT pLeftTop

Pointer to a VECTORPOINT structure that contains the top left point of a parallelogram.

const pVECTORPOINT pRightBottom

Pointer to a VECTORPOINT structure that contains the bottom right point of a parallelogram.

L_BOOL *bInside

Pointer to a variable to be updated with a value that indicates whether the object is inside the specified parallelogram. Possible values are:

Value	Meaning
TRUE	The specified object is within the specified parallelogram.
FALSE	The specified object is not within the specified parallelogram.

L_UINT32 dwFlags

Flag that indicates which object(s) to test. This flag is valid only if pObject is NULL. If pObject is not NULL, this parameter is ignored. Possible values are:

Value	Meaning
0	Test all objects in the vector handle to determine whether they are in the specified parallelogram.
VECTOR_FLAGS_SELECTED_ONLY	Test only the selected objects within the vector handle.

Returns

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

Comments

This function determines whether the specified object(s) exists within the parallelogram specified by pLeftTop and pRightBottom. The parallelogram is given in logical units.

For this function, the current view port, pan position, camera, rotation, translation and scale do not effect the actual image position in 3D space.

Not supported in DirectX.

Required DLLs and Libraries

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

Example

This example displays tests if all vector objects are inside a parallelogram.

L_INT LVectorBase__IsObjectInsideParallelogramExample(HWND hWnd, LVectorBase *pVector) 
 
{ 
   UNREFERENCED_PARAMETER(pVector); 
 
   L_INT          nRet; 
   LVectorBase    Vector; 
   VECTORPOINT    min, max; 
   L_BOOL         bInside; 
 
   nRet = Vector.Load(MAKE_IMAGE_PATH(TEXT("random.dxf"))); 
   if(nRet != SUCCESS) 
      return nRet; 
 
   nRet = Vector.GetParallelogram(&min, &max); 
   if(nRet != SUCCESS) 
      return nRet; 
 
   //The vector should be inside of the parallelogram 
 
   nRet = Vector.IsObjectInsideParallelogram(&min, &max, &bInside); 
   if(nRet != SUCCESS) 
      return nRet; 
 
   if (bInside) 
 
      MessageBox(hWnd, TEXT("IsObjectInsideParallelogram() returns TRUE"), TEXT(""), MB_OK); 
 
   else 
 
      MessageBox(hWnd, TEXT("IsObjectInsideParallelogram() returns FALSE"), TEXT(""), MB_OK); 
 
   //Now reduce the size of the parallelogram--the vector is no longer inside 
 
   max.x = (max.x - min.x) / 2; 
 
   nRet = Vector.IsObjectInsideParallelogram(&min, &max, &bInside); 
   if(nRet != SUCCESS) 
      return nRet; 
 
   if (bInside) 
 
      MessageBox(hWnd, TEXT("IsObjectInsideParallelogram() returns TRUE"), TEXT(""), MB_OK); 
 
   else 
 
      MessageBox(hWnd, TEXT("IsObjectInsideParallelogram() returns FALSE"), TEXT(""), MB_OK); 
 
   return SUCCESS; 
}