00001 #ifndef _LIBGNOMECANVASMM_AFFINETRANS_H 00002 #define _LIBGNOMECANVASMM_AFFINETRANS_H 00003 00004 // -*- C++ -*- 00005 /* $Id: affinetrans.h,v 1.6 2002/12/09 16:08:47 aholzmann Exp $ */ 00006 00007 /* affinetrans.h 00008 * 00009 * Copyright (C) 1999 The gnomemm Development Team 00010 * 00011 * This library is free software; you can redistribute it and/or 00012 * modify it under the terms of the GNU Library General Public 00013 * License as published by the Free Software Foundation; either 00014 * version 2 of the License, or (at your option) any later version. 00015 * 00016 * This library is distributed in the hope that it will be useful, 00017 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00018 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00019 * Library General Public License for more details. 00020 * 00021 * You should have received a copy of the GNU Library General Public 00022 * License along with this library; if not, write to the Free 00023 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 00024 */ 00025 00026 #include <glibmm/containers.h> 00027 #include <libgnomecanvasmm/point.h> 00028 00029 namespace Gnome 00030 { 00031 00032 namespace Art 00033 { 00034 00035 //: Used by CanvasItem. 00036 class AffineTrans 00037 { 00038 public: 00039 //: Initialize the affine as unit matrix, with a scaling factor 00040 AffineTrans(double scale = 1.0); 00041 00042 //: aff[6] 00043 explicit AffineTrans(const double aff[6]); 00044 00045 AffineTrans(const AffineTrans& src); 00046 AffineTrans& operator=(const AffineTrans& src); 00047 ~AffineTrans(); 00048 00049 double& operator[](unsigned int idx); 00050 const double& operator[](unsigned int idx) const; 00051 00052 double* gobj(); 00053 const double* gobj() const; 00054 00055 //: Apply the affine to a given point 00056 //: e.g. Point dst = affine.apply(Point(x,y)); 00057 //: is the same as: 00058 //: dst.x = x * affine[0] + y * affine[2] + affine[4]; 00059 //: dst.y = x * affine[1] + y * affine[3] + affine[5]; 00060 Point apply_to(const Point& p) const; 00061 00062 //: Apply the affine to a given point 00063 Point operator*(const Point& p) const; 00064 00065 //: Compose two affines 00066 AffineTrans operator*(const AffineTrans& aff2); 00067 00068 //: Apply other affine to the affine 00069 AffineTrans const & operator*=(AffineTrans& other); 00070 00071 bool operator==(const AffineTrans& other) const; 00072 bool operator!=(const AffineTrans& other) const; 00073 00074 //: Give the inverse of the affine 00075 void invert(); 00076 00077 //: Flip horizontally and/or vertically the affine 00078 void flip(bool horiz, bool vert); 00079 00080 //: Determine whether the affine is rectilinear (rotates 0, 90, 180 or 270 degrees) 00081 bool rectilinear() const; 00082 00083 //: Find the affine's "expansion factor", i.e. the scale amount 00084 double expansion() const; 00085 00086 //: Set up the identity matrix 00087 static AffineTrans identity(); 00088 00089 //: Set up a scaling matrix 00090 static AffineTrans scaling(double s); 00091 00092 //: Set up a scaling matrix 00093 static AffineTrans scaling(double sx, double sy); 00094 00095 //: Set up a rotation matrix; theta is given in degrees 00096 static AffineTrans rotation(double theta); 00097 00098 //: Set up a shearing matrix; theta given in degrees 00099 static AffineTrans shearing(double theta); 00100 00101 //: Set up a translation matrix 00102 static AffineTrans translation(double dx, double dy); 00103 00104 //: Set up a translation matrix 00105 static AffineTrans translation(const Point& p); 00106 00107 Glib::ustring to_string() const; 00108 00109 protected: 00110 double trans_[6]; 00111 }; 00112 00113 } //namespace Art 00114 00115 } /* namespace Gnome */ 00116 00117 std::ostream& operator<<(std::ostream& out, const Gnome::Art::AffineTrans& aff); 00118 00119 #endif // _GNOMEMM_AFFINETRANS_H
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