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L_VecEnumVertices

Summary

Enumerates all vertices within the vector handle.

Syntax

#include "ltvkrn.h"

L_LVKRN_API L_INT L_VecEnumVertices(pVector, pEnumProc, pUserData, dwFlags)

Parameters

pVECTORHANDLE pVector

Pointer to a vector handle. All vertices within this vector handle will be enumerated.

pVECTORENUMVERTICESPROC pEnumProc

Pointer to the callback function used to enumerate the vertices within the vector handle. The callback function must adhere to the function prototype described in VECTORENUMVERTICESPROC.

L_VOID * pUserData

Void pointer that you can use to pass one or more additional parameters that the callback function needs.

To use this feature, assign a value to a variable or create a structure that contains as many fields as you need. Then, in this parameter, pass the address of the variable or structure, casting it to L_VOID *. The callback function, which receives the address in its own pUserData parameter, can cast it to a pointer of the appropriate data type to access your variable or structure. If the additional parameters are not needed, you can pass NULL in this parameter.

L_UINT32 dwFlags

Flags that determine which object's vertices to enumerate. Possible values are:

Value	Meaning
0	Enumerate the vertices of all objects.
VECTOR_FLAGS_SELECTED_ONLY	Enumerate the vertices of selected objects only.

Returns

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

Comments

This function will enumerate all the vertices in the given vector.

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 will do a certain user-defined algorithm on all vertices inside the drawing.

L_VOID DoSoAndSoWithVertex(pVECTORPOINT pVertex) 
{ 
   UNREFERENCED_PARAMETER(pVertex); 
   return; 
} 
 
static L_INT EXT_CALLBACK MyEnumProc( 
   pVECTORHANDLE pVector, 
   pVECTORPOINT pVertex, 
   L_VOID* pUserData) 
{ 
   UNREFERENCED_PARAMETER(pVector); 
   UNREFERENCED_PARAMETER(pUserData); 
   /* call our custom filter function */ 
   DoSoAndSoWithVertex( pVertex ); 
 
   return( 1 );  /* Continue enumeration */ 
} 
 
L_LTVKRNTEX_API L_INT VecEnumVerticesExample(pVECTORHANDLE pVector) 
{ 
   L_INT nRet; 
   /* enumerate vertices */ 
   nRet = L_VecEnumVertices( pVector, MyEnumProc, NULL, 0L ); 
 
   return nRet; 
}