LContainer::SetScalar

#include "Ltwrappr.h"

L_INT LContainer::SetScalar (pvptScalarNum, pvptScalarDen)

pVECTORPOINT pvptScalarNum;	numerator scaling values
pVECTORPOINT pvptScalarDen;	denominator scaling values

Sets the container scaling values that will be used to adjust the coordinates values.

Parameter	Description
pvptScalarNum	Pointer to structure of type VECTORPOINT that contains the numerator to scale the coordinates in the X,Y and Z directions.
pvptScalarDen	Pointer to structure of type VECTORPOINT that contains the denominator to scale the coordinates in the X,Y and Z directions.

Returns

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

Comments

When assigning an external representation to the container every point (Xa, Ya) in the an external representation is transformed by the container to the point (Xc, Yc) by using the following steps:

1.	Add offsets:

Xb = Xa + nXOffset

Yb = Ya + nYOffset

2.	Multiply by scalars:

Xc = (Xb * nXScalarNum) / nXScalarDen

Yc = (Yb * nYScalarNum) / nYScalarDen

The default scalar values are:

ScalarNum.x = 1
ScalarNum.y = 1
ScalarNum.z = 1

ScalarDen.x = 1
ScalarDen.y = 1
ScalarDen.z = 1

Required DLLs and Libraries

LTCON

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

Example

This example shows how to set the container coordinates scaling factors.

L_INT LContainer_SetScalarExample(LContainer & lcont) 
{ 
   L_INT nRet; 
   nRet = lcont.IsValid (); 
   if ( nRet == SUCCESS ) /* check the validity of container handle */ 
   { 
      VECTORPOINT vptScalarNum, vptScalarDen ; 
      /* Set the horizontal scaling factor to 5:1 factor */ 
      vptScalarNum.x = 5 ; 
      vptScalarDen.x = 1 ; 
      /* Set the vertical scaling factor to 5:1 factor */ 
      vptScalarNum.y = 5 ; 
      vptScalarDen.y = 1 ; 
      /* Set the z scaling factor to 1:1 factor */ 
      vptScalarNum.z = 1 ; 
      vptScalarDen.z = 1 ; 
      nRet = lcont.SetScalar (&vptScalarNum, &vptScalarDen ) ; 
      if(nRet != SUCCESS) 
         return nRet; 
   } 
   else 
   { 
      return nRet ; 
   } 
   return SUCCESS ; 
}

Help Version 19.0.2017.10.27

LEADTOOLS Container and Automation C++ Class Library Help

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Functions:	LContainer::SetOffset, LContainer::GetScalar
Topics:	Container Scaling Values