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Matrix.cs

//
// Mono.Cairo.Matrix.cs
//
// Author: Duncan Mak
//         Hisham Mardam Bey (hisham.mardambey@gmail.com)
//         Idan Gazit (idan@fastmail.fm)
//
// (C) Ximian Inc, 2003 - 2005.
//
// This is an OO wrapper API for the Cairo API
//
// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

using System;
using System.Runtime.InteropServices;

namespace Cairo {

      [StructLayout(LayoutKind.Sequential)]
        public class Matrix : ICloneable
        {         
            public double Xx;
            public double Yx;
            public double Xy; 
            public double Yy;
            public double X0; 
            public double Y0;

            public Matrix (double xx, double yx, double xy, double yy,
                        double x0, double y0)
            {               
                  this.Xx = xx; this.Yx = yx; this.Xy = xy;
                  this.Yy = yy; this.X0 = x0; this.Y0 = y0;
            }
                
                public Matrix ()
            {
                  this.InitIdentity ();
            }
            
            public bool IsIdentity ()
            {
                  return (this == new Matrix ());
            }
                  
                public void InitIdentity ()
                {
                  // this.Init(1,0,0,1,0,0);
                  CairoAPI.cairo_matrix_init_identity (this);
                }
            
            public void Init (double xx, double yx, double xy, double yy,
                          double x0, double y0)
            {
                  this.Xx = xx; this.Yx = yx; this.Xy = xy;
                  this.Yy = yy; this.X0 = x0; this.Y0 = y0;
            }
            
            public void InitTranslate (double tx, double ty)
            {           
                  //this.Init (1, 0, 0, 1, tx, ty);
                  CairoAPI.cairo_matrix_init_translate (this, tx, ty);
            }           
                                     
            public void Translate (double tx, double ty)
            {
                  CairoAPI.cairo_matrix_translate (this, tx, ty);
            }
            
                public void InitScale (double sx, double sy)
                {
                  //this.Init (sx, 0, 0, sy, 0, 0);
                  CairoAPI.cairo_matrix_init_scale (this, sx, sy);
                }       
            
                public void Scale (double sx, double sy)
                {
                  CairoAPI.cairo_matrix_scale (this, sx, sy);
                }

                public void InitRotate (double radians)
                {
                  /*
                  double s, c;
                  s = Math.Sin (radians);
                  c = Math.Cos (radians);
                  this.Init (c, s, -s, c, 0, 0);
                  */
                  CairoAPI.cairo_matrix_init_rotate (this, radians);
                }       
            
                public void Rotate (double radians)
                {
                  CairoAPI.cairo_matrix_rotate (this, radians);
                }

                public Cairo.Status Invert ()
                {
                  return CairoAPI.cairo_matrix_invert (this);
                }

            public void Multiply (Matrix b)
            {
                  Matrix a = (Matrix) this.Clone ();
                  CairoAPI.cairo_matrix_multiply (this, a, b);
            }
            
            public static Matrix Multiply (Matrix a, Matrix b) {
                  Matrix result = new Matrix ();
                  CairoAPI.cairo_matrix_multiply (result, a, b);
                  return result;
            }
                  
            
                public void TransformDistance (ref double dx, ref double dy)
            {
                        CairoAPI.cairo_matrix_transform_distance (this, ref dx, ref dy);
                }

                public void TransformPoint (ref double x, ref double y)
                {
                        CairoAPI.cairo_matrix_transform_point (this, ref x, ref y);
            }

            public override String ToString ()
            {
                  String s = String.Format ("xx:{0:##0.0#} yx:{1:##0.0#} xy:{2:##0.0#} yy:{3:##0.0#} x0:{4:##0.0#} y0:{5:##0.0#}",
                        this.Xx, this.Yx, this.Xy, this.Yy, this.X0, this.Y0);
                  return s;
            }
            
            public static bool operator == (Matrix lhs, Matrix rhs)
            {
                  return (lhs.Xx == rhs.Xx &&
                        lhs.Xy == rhs.Xy &&
                        lhs.Yx == rhs.Yx &&
                        lhs.Yy == rhs.Yy &&
                        lhs.X0 == rhs.X0 &&
                        lhs.Y0 == rhs.Y0 );
            }
            
            public static bool operator != (Matrix lhs, Matrix rhs)
            {
                  return !(lhs==rhs);     
            }
            
            
            
            public override bool Equals(object o)
            {
                  if (! (o is Matrix))
                        return false;
                  else
                        return (this == (Matrix) o);
            }
            
            public override int GetHashCode()
            {
                  return  (int)this.Xx ^ (int)this.Xx>>32 ^
                        (int)this.Xy ^ (int)this.Xy>>32 ^
                        (int)this.Yx ^ (int)this.Yx>>32 ^
                        (int)this.Yy ^ (int)this.Yy>>32 ^
                        (int)this.X0 ^ (int)this.X0>>32 ^
                        (int)this.Y0 ^ (int)this.Y0>>32;
            }
            
            public object Clone()
            {
                  return this.MemberwiseClone ();
            }
            
        }
}

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