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/* ============================================================
*
* This file is a part of digiKam project
* http://www.digikam.org
*
* Date : 2005-02-17
* Description : a matrix implementation for image
* perspective adjustment.
*
* Copyright (C) 2005-2007 by Gilles Caulier <caulier dot gilles at gmail dot com>
* Copyright (C) 2006-2007 by Marcel Wiesweg <marcel dot wiesweg at gmx dot de>
*
* This program is free software; you can redistribute it
* and/or modify it under the terms of the GNU General
* Public License as published by the Free Software Foundation;
* either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* ============================================================ */
#ifndef IMAGEEFFECT_PERSPECTIVE_MATRIX_H
#define IMAGEEFFECT_PERSPECTIVE_MATRIX_H
namespace DigikamPerspectiveImagesPlugin
{
class Matrix
{
public:
/**
* Matrix:
*
* Initializes matrix to the identity matrix.
*/
Matrix();
/**
* translate:
* @x: Translation in X direction.
* @y: Translation in Y direction.
*
* Translates the matrix by x and y.
*/
void translate(double x, double y);
/**
* scale:
* @x: X scale factor.
* @y: Y scale factor.
*
* Scales the matrix by x and y
*/
void scale(double x, double y);
/**
* invert:
*
* Inverts this matrix.
*/
void invert();
/**
* multiply:
* @matrix: The other input matrix.
*
* Multiplies this matrix with another matrix
*/
void multiply(const Matrix &matrix1);
/**
* transformPoint:
* @x: The source X coordinate.
* @y: The source Y coordinate.
* @newx: The transformed X coordinate.
* @newy: The transformed Y coordinate.
*
* Transforms a point in 2D as specified by the transformation matrix.
*/
void transformPoint(double x, double y, double *newx, double *newy) const;
/**
* determinant:
*
* Calculates the determinant of this matrix.
*
* Returns: The determinant.
*/
double determinant() const;
/**
* coeff:
*
* The 3x3 matrix data
*/
double coeff[3][3];
};
} // namespace DigikamPerspectiveImagesPlugin
#endif // IMAGEEFFECT_PERSPECTIVE_MATRIX_H
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