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#ifndef _LIBGNOMECANVASMM_AFFINETRANS_H
#define _LIBGNOMECANVASMM_AFFINETRANS_H
// -*- C++ -*-
/* $Id$ */
/* affinetrans.h
*
* Copyright (C) 1999 The gnomemm Development Team
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <glibmm/containers.h>
#include <libgnomecanvasmm/point.h>
namespace Gnome
{
namespace Art
{
//: Used by CanvasItem.
class AffineTrans
{
public:
//: Initialize the affine as unit matrix, with a scaling factor
AffineTrans(double scale = 1.0);
//: aff[6]
explicit AffineTrans(const double aff[6]);
AffineTrans(const AffineTrans& src);
AffineTrans& operator=(const AffineTrans& src);
~AffineTrans();
double& operator[](unsigned int idx);
const double& operator[](unsigned int idx) const;
double* gobj();
const double* gobj() const;
//: Apply the affine to a given point
//: e.g. Point dst = affine.apply(Point(x,y));
//: is the same as:
//: dst.x = x * affine[0] + y * affine[2] + affine[4];
//: dst.y = x * affine[1] + y * affine[3] + affine[5];
Point apply_to(const Point& p) const;
//: Apply the affine to a given point
Point operator*(const Point& p) const;
//: Compose two affines
AffineTrans operator*(const AffineTrans& aff2);
//: Apply other affine to the affine
AffineTrans const & operator*=(AffineTrans& other);
bool operator==(const AffineTrans& other) const;
bool operator!=(const AffineTrans& other) const;
//: Give the inverse of the affine
void invert();
//: Flip horizontally and/or vertically the affine
void flip(bool horiz, bool vert);
//: Determine whether the affine is rectilinear (rotates 0, 90, 180 or 270 degrees)
bool rectilinear() const;
//: Find the affine's "expansion factor", i.e. the scale amount
double expansion() const;
//: Set up the identity matrix
static AffineTrans identity();
//: Set up a scaling matrix
static AffineTrans scaling(double s);
//: Set up a scaling matrix
static AffineTrans scaling(double sx, double sy);
//: Set up a rotation matrix; theta is given in degrees
static AffineTrans rotation(double theta);
//: Set up a shearing matrix; theta given in degrees
static AffineTrans shearing(double theta);
//: Set up a translation matrix
static AffineTrans translation(double dx, double dy);
//: Set up a translation matrix
static AffineTrans translation(const Point& p);
Glib::ustring to_string() const;
protected:
double trans_[6];
};
} //namespace Art
} /* namespace Gnome */
std::ostream& operator<<(std::ostream& out, const Gnome::Art::AffineTrans& aff);
#endif // _GNOMEMM_AFFINETRANS_H
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