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LAnnCurveClosed::AddUserHandle

Summary

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

Syntax

#include "ltwrappr.h"

virtual L_INT LAnnCurveClosed::AddUserHandle(pAnnHandle)

Parameters

pANNHANDLE pAnnHandle

Pointer to a structure that defines the user handle.

Returns

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

Comments

Before calling this function, you must create the LAnnCurveClosed 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.

Example

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

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