// Copyright 1999
// College of Computer Science
// Northeastern University Boston MA 02115

// This software may be used for educational purposes as long as this copyright
// notice is retained at the top of all files

// Should this software be modified, the words "Modified from Original" must be
// included as a comment below this notice

// All publication rights are retained.  This software or its documentation may
// not be published in any media either in whole or in part.

///////////////////////////////////////////////////////////////////////////////

//	Scale2D.cpp

///////////////////////////////////////////////////////////////////////////////

#include "CoreTools.h"				// needed for core tools compile in Win32

#include "Scale2D.h"

// LinearScale2D Set

LinearScale2D& LinearScale2D::Set(const Rect2D& Bounds, const RectData& Limits) {
	double X1;
	double Y1;
	double X2;
	double Y2;
	
	Bounds.Get(X1, Y1, X2, Y2);
	
	short x1;
	short y1;
	short x2;
	short y2;
	
	Limits.Get(x1, y1, x2, y2);
	
	sx.Set(X1, X2, x1, x2);		// maintain x direction
	sy.Set(Y1, Y2, y2, y1);		// reverse  y direction

	return *this;
}


// LinearScale2D SetTrueShape

LinearScale2D& LinearScale2D::SetTrueShape(const Rect2D& Bounds, const RectData& Limits) {
	// extract rectangle data
	
	double X1;
	double Y1;
	double X2;
	double Y2;
	
	Bounds.Get(X1, Y1, X2, Y2);
	
	short x1;
	short y1;
	short x2;
	short y2;
	
	Limits.Get(x1, y1, x2, y2);
	
	// compute factors and offsets
	
	double FactorX;
	double FactorY;
	double OffsetX;
	double OffsetY;
	
	// maintain x direction when computing FactorX

	FactorX =   ComputeFactor(X1, X2, x1, x2);
	
	// reverse  y direction when computing FactorY
	
	FactorY = - ComputeFactor(Y1, Y2, y1, y2);

	// now equalize factors in magnitude
	
	EqualizeSize(FactorX, FactorY);

	// finally compute offsets to center image of Bounds within Limits
	
	OffsetX = ComputeOffset(X1, X2, x1, x2, FactorX);
	OffsetY = ComputeOffset(Y1, Y2, y1, y2, FactorY);
	
	// now set scale objects
	
	sx.Set(FactorX, OffsetX);
	sy.Set(FactorY, OffsetY);

	return *this;
}