LAnnotation::GetScalarX

#include "ltwrappr.h"

virtual L_DOUBLE LAnnotation::GetScalarX()

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

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.

See Also

Functions:

Class Members

Topics:

Annotation Functions: Getting and Setting Geometric Properties

 

Low-Level Coordinate System for Annotations

 

Fixed Annotations

 

Minimizing Flicker With Double Buffering

 

Displaying and Manipulating Annotation Objects

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; 
}

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