Paul Davis
449aab3c46
git-svn-id: svn://localhost/ardour2/branches/3.0@3435 d708f5d6-7413-0410-9779-e7cbd77b26cf
120 lines
3.2 KiB
C++
120 lines
3.2 KiB
C++
#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
|