LAnnPolygon::AddUserHandle

#include "ltwrappr.h"

virtual L_INT LAnnPolygon::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 LAnnPolygon 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.

See Also

Functions:	Class Members, LAnnPolygon::EnumerateHandles, LAnnPolygon::EnumHandleCallBack, LAnnPolygon::GetUserHandle, LAnnPolygon::GetUserHandles, LAnnPolygon::ChangeUserHandle, LAnnPolygon::DeleteUserHandle
Topics:	Annotation Functions: Object Properties
	Implementing Annotations
	Automated User Interface for Annotations
	Annotation Functions: Creating and Deleting Annotations
	Types of Annotations
	Annotation Functions: Implementing Custom Annotations
	Annotation Functions: Creating Custom Annotations

Example

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

L_INT LAnnPolygon_AddUserHandleExample(LAnnPolygon *pLPolygon)
{
	L_INT nRet;
   ANNHANDLE AnnHandle; 
   L_UINT uType; 
   ANNRECT arc; 
   
   uType = pLPolygon->GetType();
   if (uType == ANNOBJECT_POLYGON) 
   {
      nRet = pLPolygon->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 = pLPolygon->AddUserHandle(&AnnHandle); 
		if(nRet != SUCCESS)
			return nRet;
      AnnHandle.aptContainer.x = (arc.left + arc.right)/2; 
      AnnHandle.aptContainer.y = arc.bottom; 
      nRet = pLPolygon->AddUserHandle(&AnnHandle); 
		if(nRet != SUCCESS)
			return nRet;
   }
   else
	{
      MessageBox(NULL, TEXT("Annotation object must be a Polygon object."), TEXT("Error"), MB_OK); 
		return FAILURE;
	}
	return SUCCESS;
}