LAnnCurve::AddUserHandle

#include "ltwrappr.h"

virtual L_INT LAnnCurve::AddUserHandle(pAnnHandle)

/* pointer to a structure that defines the user handle */

Adds a user-defined handle to an annotation object, where pAnnHandle is a pointer to the structure defining an annotation handle.

Parameter	Description
pAnnHandle	Pointer to a structure that defines the user handle.

Returns

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

Comments

Before calling this function, you must create the LAnnCurve object.

Call this function one or more times to add user handles to an existing annotation object.

The user handle location can be defined using container coordinates or client coordinates.

Client coordinates factor in the current zoom factor, and the horizontal and vertical scrolling.

For more information on defining a user handle, see the documentation for the ANNHANDLE structure.

Required DLLs and Libraries

LTANN

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

Platforms

Win32, x64.

See Also

Functions:	Class Members
Topics:	Annotation Functions: Object Properties

Example

// This example adds user handles to the center of the top and bottom of a Curve object.

L_INT LAnnCurve_AddUserHandleExample(LAnnCurve *pLCurve) 
{
   L_INT nRet;
   ANNHANDLE AnnHandle; 
   L_UINT uType; 
   ANNRECT arc; 
   
   uType = pLCurve->GetType();
   if (uType == ANNOBJECT_CURVE) 
   {
      nRet = pLCurve->GetRect(&arc, NULL); 
      if(nRet != SUCCESS)
         return nRet;
      memset(&AnnHandle, 0, sizeof(ANNHANDLE)); 
      AnnHandle.uStructSize   = sizeof(ANNHANDLE);  
      AnnHandle.nID           = 100; 
      AnnHandle.bVisible      = TRUE; 
      AnnHandle.crPen         = RGB(0,0,0); 
      AnnHandle.crFill        = RGB(255,0,0); 
      AnnHandle.nShape        = ANNHANDLE_SHAPE_CIRCLE; 
      AnnHandle.hCursor       = NULL; 
      AnnHandle.uFlags        =  ANNHANDLE_ID | ANNHANDLE_LOCATION | 
                                 ANNHANDLE_CONTAINER_COORDINATES | ANNHANDLE_VISIBLE | 
                                 ANNHANDLE_PEN_COLOR | ANNHANDLE_FILL_COLOR | ANNHANDLE_SHAPE; 
      
      AnnHandle.aptContainer.x = (arc.left + arc.right)/2; 
      AnnHandle.aptContainer.y = arc.top; 
      nRet = pLCurve->AddUserHandle(&AnnHandle); 
      if(nRet != SUCCESS)
         return nRet;
      AnnHandle.aptContainer.x = (arc.left + arc.right)/2; 
      AnnHandle.aptContainer.y = arc.bottom; 
      nRet = pLCurve->AddUserHandle(&AnnHandle); 
      if(nRet != SUCCESS)
         return nRet;
   }
   else
   {
      MessageBox(NULL, TEXT("Annotation object must be a Curve object."), TEXT("Error"), MB_OK); 
      return FAILURE;
   }
   return SUCCESS;
}