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Matrix.cs
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Matrix.cs
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//
// System.Drawing.Drawing2D.Matrix.cs: CoreGraphics implementation
//
// Authors:
// Stefan Maierhofer <sm@cg.tuwien.ac.at>
// Dennis Hayes (dennish@Raytek.com)
// Duncan Mak (duncan@ximian.com)
// Ravindra (rkumar@novell.com)
// Miguel de Icaza (miguel@xamarin.com)
//
// (C) Ximian, Inc. http://www.ximian.com
// Copyright (C) 2004, 2006 Novell, Inc (http://www.novell.com)
// Copyright 2011 Xamarin Inc
//
// 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.Runtime.InteropServices;
using System.Collections.Generic;
#if MONOMAC
using MonoMac.CoreGraphics;
#else
using MonoTouch.CoreGraphics;
#endif
namespace System.Drawing.Drawing2D
{
public sealed class Matrix : MarshalByRefObject, IDisposable
{
internal CGAffineTransform transform;
public Matrix ()
{
}
internal Matrix (CGAffineTransform transform)
{
this.transform = transform;
}
public Matrix (Rectangle rect, Point[] plgpts)
{
if (plgpts == null)
throw new ArgumentNullException ("plgpts");
if (plgpts.Length != 3)
throw new ArgumentException ("plgpts");
Point p0 = plgpts [0];
Point p1 = plgpts [1];
Point p2 = plgpts [2];
float m11 = (p1.X - p0.X) / (float)rect.Width;
float m12 = (p1.Y - p0.Y) / (float)rect.Width;
float m21 = (p2.X - p0.X) / (float)rect.Height;
float m22 = (p2.X - p0.X) / (float)rect.Height;
transform = new CGAffineTransform (m11, m12, m21, m22, p0.X, p0.Y);
transform.Translate (rect.Width, rect.Height);
}
public Matrix (RectangleF rect, PointF[] plgpts)
{
if (plgpts == null)
throw new ArgumentNullException ("plgpts");
if (plgpts.Length != 3)
throw new ArgumentException ("plgpts");
PointF p0 = plgpts [0];
PointF p1 = plgpts [1];
PointF p2 = plgpts [2];
float m11 = (p1.X - p0.X) / rect.Width;
float m12 = (p1.Y - p0.Y) / rect.Width;
float m21 = (p2.X - p0.X) / rect.Height;
float m22 = (p2.X - p0.X) / rect.Height;
transform = new CGAffineTransform (m11, m12, m21, m22, p0.X, p0.Y);
transform.Translate (rect.Width, rect.Height);
}
public Matrix (float m11, float m12, float m21, float m22, float dx, float dy)
{
transform = new CGAffineTransform (m11, m12, m21, m22, dx, dy);
}
// properties
public float[] Elements {
get {
return new float [6] { transform.xx, transform.yx, transform.xy, transform.yy, transform.x0, transform.y0 };
}
}
public bool IsIdentity {
get {
return transform.IsIdentity;
}
}
public bool IsInvertible {
get {
var inverted = transform.Invert ();
if (inverted.xx == transform.xx &&
inverted.xy == transform.xy &&
inverted.yx == transform.yx &&
inverted.yy == transform.yy &&
inverted.x0 == transform.x0 &&
inverted.y0 == transform.y0)
return false;
return true;
}
}
public float OffsetX {
get {
return transform.x0;
}
}
public float OffsetY {
get {
return transform.y0;
}
}
internal bool IsScaled {
get {
return transform.xx != 1f || transform.yy != 1f;
}
}
public Matrix Clone()
{
var copy = new Matrix ();
copy.transform = transform;
return copy;
}
public void Dispose ()
{
}
public override bool Equals (object obj)
{
Matrix m = obj as Matrix;
if (m != null) {
var o = m.transform;
var t = transform;
return (o.x0 == t.x0 && o.y0 == t.y0 &&
o.xx == t.xx && o.yy == t.yy &&
o.xy == t.xy && o.yx == t.yx);
} else
return false;
}
~Matrix()
{
}
public override int GetHashCode ()
{
return transform.GetHashCode ();
}
public void Invert ()
{
transform = transform.Invert ();
}
public void Multiply (Matrix matrix)
{
if (matrix == null)
throw new ArgumentNullException ("matrix");
transform.Multiply (matrix.transform);
}
public void Multiply (Matrix matrix, MatrixOrder order)
{
if (matrix == null)
throw new ArgumentNullException ("matrix");
if (order == MatrixOrder.Prepend)
transform.Multiply (matrix.transform);
else {
var mtrans = matrix.transform;
mtrans.Multiply (transform);
transform = mtrans;
}
}
public void Reset()
{
transform = CGAffineTransform.MakeIdentity ();
}
public void Rotate (float angle)
{
transform.Rotate (angle);
}
public void Rotate (float angle, MatrixOrder order)
{
throw new NotImplementedException ();
}
public void RotateAt (float angle, PointF point)
{
RotateAt (angle, point, MatrixOrder.Prepend);
}
public void RotateAt (float angle, PointF point, MatrixOrder order)
{
if ((order < MatrixOrder.Prepend) || (order > MatrixOrder.Append))
throw new ArgumentException ("order");
angle *= (float) (Math.PI / 180.0); // degrees to radians
float cos = (float) Math.Cos (angle);
float sin = (float) Math.Sin (angle);
float e4 = -point.X * cos + point.Y * sin + point.X;
float e5 = -point.X * sin - point.Y * cos + point.Y;
float[] m = this.Elements;
if (order == MatrixOrder.Prepend)
transform = new CGAffineTransform (cos * m[0] + sin * m[2],
cos * m[1] + sin * m[3],
-sin * m[0] + cos * m[2],
-sin * m[1] + cos * m[3],
e4 * m[0] + e5 * m[2] + m[4],
e4 * m[1] + e5 * m[3] + m[5]);
else
transform = new CGAffineTransform (m[0] * cos + m[1] * -sin,
m[0] * sin + m[1] * cos,
m[2] * cos + m[3] * -sin,
m[2] * sin + m[3] * cos,
m[4] * cos + m[5] * -sin + e4,
m[4] * sin + m[5] * cos + e5);
}
public void Scale (float scaleX, float scaleY)
{
transform.Scale (scaleX, scaleY);
}
public void Scale (float scaleX, float scaleY, MatrixOrder order)
{
var affine = CGAffineTransform.MakeScale (scaleX, scaleY);
if (order == MatrixOrder.Prepend)
transform.Multiply (affine);
else {
affine.Multiply (transform);
transform = affine;
}
}
public void Shear (float shearX, float shearY)
{
transform.Multiply (new CGAffineTransform (1, shearX, shearY, 1, 0, 0));
}
public void Shear (float shearX, float shearY, MatrixOrder order)
{
var affine = new CGAffineTransform (1, shearX, shearY, 1, 0, 0);
if (order == MatrixOrder.Prepend)
transform.Multiply (affine);
else {
affine.Multiply (transform);
transform = affine;
}
}
public void TransformPoints (Point[] pts)
{
if (pts == null)
throw new ArgumentNullException ("pts");
for (int i = 0; i < pts.Length; i++){
var point = pts [i];
pts [i] = new Point ((int)(transform.xx * point.X + transform.xy * point.Y + transform.x0),
(int)(transform.yx * point.X + transform.yy * point.Y + transform.y0));
}
}
public void TransformPoints (PointF[] pts)
{
if (pts == null)
throw new ArgumentNullException ("pts");
for (int i = 0; i < pts.Length; i++)
pts [i] = transform.TransformPoint (pts [i]);
}
internal void TransformPoints (List<PointF> pts)
{
if (pts == null)
throw new ArgumentNullException ("pts");
for (int i = 0; i < pts.Count; i++)
pts [i] = transform.TransformPoint (pts [i]);
}
public void TransformVectors (Point[] pts)
{
if (pts == null)
throw new ArgumentNullException ("pts");
for (int i = 0; i < pts.Length; i++){
var point = pts [i];
pts [i] = new Point ((int)(transform.xx * point.X + transform.xy * point.Y),
(int)(transform.yx * point.X + transform.yy * point.Y));
}
}
public void TransformVectors (PointF[] pts)
{
if (pts == null)
throw new ArgumentNullException ("pts");
for (int i = 0; i < pts.Length; i++){
var point = pts [i];
pts [i] = new PointF ((float)(transform.xx * point.X + transform.xy * point.Y),
(float)(transform.yx * point.X + transform.yy * point.Y));
}
}
public void Translate (float offsetX, float offsetY)
{
transform.Translate (offsetX, offsetY);
}
public void Translate (float offsetX, float offsetY, MatrixOrder order)
{
var affine = CGAffineTransform.MakeTranslation (offsetX, offsetY);
if (order == MatrixOrder.Prepend)
transform.Multiply (affine);
else {
affine.Multiply (transform);
transform = affine;
}
}
public void VectorTransformPoints (Point[] pts)
{
TransformVectors (pts);
}
}
}