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L_VecGetObject

Summary

Gets the object information of the specified vector object.

Syntax

#include "ltvkrn.h"

L_LVKRN_API L_INT L_VecGetObject(pVector, pObject, nType, pObjectDesc)

Parameters

const pVECTORHANDLE pVector

Pointer to a vector handle.

const pVECTOROBJECT pObject

Pointer to a vector object.

L_INT nType

Object type. Possible values are:

Value	Meaning
VECTOR_ARC	Arc.
VECTOR_CHORD	Chord.
VECTOR_CIRCLE	Circle.
VECTOR_CLONE	Clone object of a vector group.
VECTOR_ELLIPSE	Ellipse.
VECTOR_ELLIPTICALARC	Elliptical arc.
VECTOR_LINE	Line.
VECTOR_PIE	Pie section.
VECTOR_POLYBEZIER	Poly Bezier curve.
VECTOR_POLYDRAW	Polydraw.
VECTOR_POLYGON	Polygon.
VECTOR_POLYLINE	Polyline.
VECTOR_RASTER	Raster.
VECTOR_RECTANGLE	Rectangle.
VECTOR_TEXT	Text.
VECTOR_VERTEX	3D vertex in space.

L_VOID * pObjectDesc

Pointer to a vector object structure to be updated with the object information of the specified object.

Returns

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

Comments

This function is used to obtain information about a certain vector object.

If you set nType to VECTOR_OBJECT, the structure pointed to by pObjectDesc will be filled with the general VECTOROBJECT structure information common to all object types.

If you want specific information about an object, set the nType member to the requested object type and set pObjectDesc to the address of the appropriate vector object structure.

Once pObjectDesc is no longer needed, free any associated resources by calling L_VecFreeObject.

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

The first example will select the object under the current mouse cursor.
The second example gets and sets specific information about a VECTOR_RECTANGLE object.
The second example will check if the object under hit-test is a rectangle and then change its pen color to red.

L_INT VecGetObjectExample1( 
   pVECTORHANDLE pVector, 
   const POINT* pptMouse) 
{ 
   VECTOROBJECT   Object; 
   VECTOROBJECT   ObjectDesc; 
   L_INT          nRet; 
 
   /* Get the object under the mouse cursor */ 
   nRet = L_VecHitTest( pVector, pptMouse, &Object ); 
   if( nRet == SUCCESS ) 
   { 
      /* Select this object */ 
      nRet = L_VecGetObject( pVector, &Object, VECTOR_OBJECT, &ObjectDesc ); 
      if(nRet != SUCCESS) 
         return nRet; 
 
      ObjectDesc.dwFlags |= VECTOR_OBJECT_SELECTED; 
      nRet = L_VecSetObject( pVector, &Object, VECTOR_OBJECT, &ObjectDesc ); 
      if(nRet != SUCCESS) 
         return nRet; 
 
      /* Clean up */ 
      nRet = L_VecFreeObject(VECTOR_OBJECT, &ObjectDesc ); 
   } 
 
   return nRet; 
} 
 
L_INT VecGetObjectExample2( 
   pVECTORHANDLE  pVector, 
   const POINT*   pptMouse) 
{ 
   VECTOROBJECT      Object; 
   VECTORRECTANGLE   Rectangle; 
   L_INT             nRet; 
 
   /* get the object under ths mouse cursor */ 
   nRet = L_VecHitTest( pVector, pptMouse, &Object ); 
 
   /* make sure the object is a rectangle */ 
   if( nRet == SUCCESS && Object.nType == VECTOR_RECTANGLE ) 
   { 
      /* change its pen color to red */ 
      nRet = L_VecGetObject( pVector, &Object, VECTOR_RECTANGLE, &Rectangle ); 
      if(nRet != SUCCESS) 
         return nRet; 
 
      Rectangle.Pen.bExtPen = FALSE; 
      Rectangle.Pen.NewPen.LogPen.lopnColor = RGB( 0xFF, 0x00, 0x00 ); 
      nRet = L_VecSetObject( pVector, &Object, VECTOR_RECTANGLE, &Rectangle ); 
      if(nRet != SUCCESS) 
         return nRet; 
 
      /* clean up */ 
      nRet = L_VecFreeObject( VECTOR_RECTANGLE, &Rectangle ); 
   } 
 
   return nRet; 
}