In This Topic ▼

LAnnotation::GetScalarX

Summary

Gets the horizontal scaling factor that is applied to the annotation object.

Syntax

#include "ltwrappr.h"

virtual L_DOUBLE LAnnotation::GetScalarX()

Returns

The horizontal scaling factor.

Comments

Typically, the scaling factors are applied to a root container so that the annotations will match the displayed image.

Offset values, which are set by the LAnnotation::SetOffsetX and LAnnotation::SetOffsetY functions, are applied after the scalar properties. For more information, refer to Low-Level Coordinate System for Annotations.

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

L_INT LAnnotation_GetScalarXExample(LAnnotation& LeadAnn,LBitmapBase& LeadBitmap) 
{ 
   L_INT nRet; 
   L_INT nXPercent, nYPercent; // X and Y scale percentage  
   L_DOUBLE dXScalar, dYScalar; // X and Y floating point scalars  
   L_TCHAR  szMessage[80]; // Message buffer  
   RECT rClientArea ; 
    
   // Get the floating point scalars  
   dXScalar = LeadAnn.GetScalarX(); 
   dYScalar = LeadAnn.GetScalarY(); 
    
   // Convert the scalars to percentages  
   nXPercent = (L_INT)(dXScalar * 100); 
   nYPercent = (L_INT)(dYScalar * 100); 
 
   // Display the percentages in a message 
   wsprintf (szMessage, TEXT("%d percent X and %d percent Y"), nXPercent, nYPercent); 
   MessageBox (NULL, szMessage, TEXT("Notice"), MB_OK); 
   //... 
   //... 
   GetClientRect(LeadAnn.GetWnd(),&rClientArea); 
 
   nRet = LeadAnn.SetScalarX((L_DOUBLE) rClientArea.right / LeadBitmap.GetWidth()); 
   if(nRet != SUCCESS) 
      return nRet; 
   nRet = LeadAnn.SetScalarY((L_DOUBLE) rClientArea.bottom / LeadBitmap.GetHeight()); 
   if(nRet != SUCCESS) 
      return nRet; 
//... 
   return SUCCESS; 
}