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CGAffineTransform.cs
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CGAffineTransform.cs
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//
// CGAffineTransform.cs: Implements the managed side
//
// Authors: Mono Team
//
// Copyright 2009 Novell, Inc
// Copyright 2014 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;
using System.Runtime.InteropServices;
using ObjCRuntime;
using Foundation;
namespace CoreGraphics {
// CGAffineTransform.h
[StructLayout(LayoutKind.Sequential)]
public struct CGAffineTransform {
public /* CGFloat */ nfloat xx; // a
public /* CGFloat */ nfloat yx; // b
public /* CGFloat */ nfloat xy; // c
public /* CGFloat */ nfloat yy; // d
public /* CGFloat */ nfloat x0; // tx
public /* CGFloat */ nfloat y0; // ty
#if !COREBUILD
//
// Constructors
//
public CGAffineTransform (nfloat xx, nfloat yx, nfloat xy, nfloat yy, nfloat x0, nfloat y0)
{
this.xx = xx;
this.yx = yx;
this.xy = xy;
this.yy = yy;
this.x0 = x0;
this.y0 = y0;
}
// Identity
public static CGAffineTransform MakeIdentity ()
{
return new CGAffineTransform (1, 0, 0, 1, 0, 0);
}
public static CGAffineTransform MakeRotation (nfloat angle)
{
var cos = (nfloat) Math.Cos (angle);
var sin = (nfloat) Math.Sin (angle);
return new CGAffineTransform (
cos, sin,
-sin, cos,
0, 0);
}
public static CGAffineTransform MakeScale (nfloat sx, nfloat sy)
{
return new CGAffineTransform (sx, 0, 0, sy, 0, 0);
}
public static CGAffineTransform MakeTranslation (nfloat tx, nfloat ty)
{
return new CGAffineTransform (1, 0, 0, 1, tx, ty);
}
//
// Operations
//
public static CGAffineTransform Multiply (CGAffineTransform a, CGAffineTransform b)
{
return new CGAffineTransform (a.xx * b.xx + a.yx * b.xy,
a.xx * b.yx + a.yx * b.yy,
a.xy * b.xx + a.yy * b.xy,
a.xy * b.yx + a.yy * b.yy,
a.x0 * b.xx + a.y0 * b.xy + b.x0,
a.x0 * b.yx + a.y0 * b.yy + b.y0);
}
public void Multiply (CGAffineTransform b)
{
var a = this;
xx = a.xx * b.xx + a.yx * b.xy;
yx = a.xx * b.yx + a.yx * b.yy;
xy = a.xy * b.xx + a.yy * b.xy;
yy = a.xy * b.yx + a.yy * b.yy;
x0 = a.x0 * b.xx + a.y0 * b.xy + b.x0;
y0 = a.x0 * b.yx + a.y0 * b.yy + b.y0;
}
public void Scale (nfloat sx, nfloat sy, MatrixOrder order)
{
switch (order) {
case MatrixOrder.Prepend: // The new operation is applied before the old operation.
this = Multiply (MakeScale (sx, sy), this); // t' = [ sx 0 0 sy 0 0 ] * t – Swift equivalent
break;
case MatrixOrder.Append: // The new operation is applied after the old operation.
this = Multiply (this, MakeScale (sx, sy)); // t' = t * [ sx 0 0 sy 0 0 ]
break;
default:
throw new ArgumentOutOfRangeException (nameof (order));
}
}
[Advice ("By default, the new operation is applied after the old operation: t' = t * [ sx 0 0 sy 0 0 ].\nTo have the same behavior as the native Swift API, pass 'MatrixOrder.Prepend' to 'Scale (nfloat, nfloat, MatrixOrder)'.")]
public void Scale (nfloat sx, nfloat sy)
{
Scale (sx, sy, MatrixOrder.Append);
}
public static CGAffineTransform Scale (CGAffineTransform transform, nfloat sx, nfloat sy)
{
return new CGAffineTransform (
sx * transform.xx,
sx * transform.yx,
sy * transform.xy,
sy * transform.yy,
transform.x0,
transform.y0);
}
public void Translate (nfloat tx, nfloat ty, MatrixOrder order)
{
switch (order) {
case MatrixOrder.Prepend: // The new operation is applied before the old operation.
this = Multiply (MakeTranslation (tx, ty), this); // t' = [ 1 0 0 1 tx ty ] * t – Swift equivalent
break;
case MatrixOrder.Append: // The new operation is applied after the old operation.
this = Multiply (this, MakeTranslation (tx, ty)); // t' = t * [ 1 0 0 1 tx ty ]
break;
default:
throw new ArgumentOutOfRangeException (nameof (order));
}
}
[Advice ("By default, the new operation is applied after the old operation: t' = t * [ 1 0 0 1 tx ty ].\nTo have the same behavior as the native Swift API, pass 'MatrixOrder.Prepend' to 'Translate (nfloat, nfloat, MatrixOrder)'.")]
public void Translate (nfloat tx, nfloat ty)
{
Translate (tx, ty, MatrixOrder.Append);
}
public static CGAffineTransform Translate (CGAffineTransform transform, nfloat tx, nfloat ty)
{
return new CGAffineTransform (
transform.xx,
transform.yx,
transform.xy,
transform.yy,
tx * transform.xx + ty * transform.xy + transform.x0,
tx * transform.yx + ty * transform.yy + transform.y0);
}
public void Rotate (nfloat angle, MatrixOrder order)
{
switch (order) {
case MatrixOrder.Prepend: // The new operation is applied before the old operation.
this = Multiply (MakeRotation (angle), this); // t' = [ cos(angle) sin(angle) -sin(angle) cos(angle) 0 0 ] * t – Swift equivalent
break;
case MatrixOrder.Append: // The new operation is applied after the old operation.
this = Multiply (this, MakeRotation (angle)); // t' = t * [ cos(angle) sin(angle) -sin(angle) cos(angle) 0 0 ]
break;
default:
throw new ArgumentOutOfRangeException (nameof (order));
}
}
[Advice ("By default, the new operation is applied after the old operation: t' = t * [ cos(angle) sin(angle) -sin(angle) cos(angle) 0 0 ].\nTo have the same behavior as the native Swift API, pass 'MatrixOrder.Prepend' to 'Rotate (nfloat, MatrixOrder)'.")]
public void Rotate (nfloat angle)
{
Rotate (angle, MatrixOrder.Append);
}
public static CGAffineTransform Rotate (CGAffineTransform transform, nfloat angle)
{
var cos = (nfloat) Math.Cos (angle);
var sin = (nfloat) Math.Sin (angle);
return new CGAffineTransform (
cos * transform.xx + sin * transform.xy,
cos * transform.yx + sin * transform.yy,
cos * transform.xy - sin * transform.xx,
cos * transform.yy - sin * transform.yx,
transform.x0,
transform.y0);
}
public bool IsIdentity {
get {
return xx == 1 && yx == 0 && xy == 0 && yy == 1 && x0 == 0 && y0 == 0;
}
}
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#}", xx, yx, xy, yy, x0, y0);
return s;
}
public static bool operator == (CGAffineTransform lhs, CGAffineTransform 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 != (CGAffineTransform lhs, CGAffineTransform rhs)
{
return !(lhs==rhs);
}
public static CGAffineTransform operator * (CGAffineTransform a, CGAffineTransform b)
{
return new CGAffineTransform (a.xx * b.xx + a.yx * b.xy,
a.xx * b.yx + a.yx * b.yy,
a.xy * b.xx + a.yy * b.xy,
a.xy * b.yx + a.yy * b.yy,
a.x0 * b.xx + a.y0 * b.xy + b.x0,
a.x0 * b.yx + a.y0 * b.yy + b.y0);
}
public override bool Equals(object o)
{
if (o is CGAffineTransform transform) {
return (xx == transform.xx && xy == transform.xy &&
yx == transform.yx && yy == transform.yy &&
x0 == transform.x0 && y0 == transform.y0);
} else
return false;
}
public override int GetHashCode()
{
return (int)this.xx ^ (int)this.xy ^
(int)this.yx ^ (int)this.yy ^
(int)this.x0 ^ (int)this.y0;
}
public CGPoint TransformPoint (CGPoint point)
{
return new CGPoint (xx * point.X + xy * point.Y + x0,
yx * point.X + yy * point.Y + y0);
}
[DllImport (Constants.CoreGraphicsLibrary)]
public extern static CGRect CGRectApplyAffineTransform (CGRect rect, CGAffineTransform t);
public CGRect TransformRect (CGRect rect)
{
return CGRectApplyAffineTransform (rect, this);
}
[DllImport (Constants.CoreGraphicsLibrary)]
extern static CGSize CGSizeApplyAffineTransform (CGSize rect, CGAffineTransform t);
public CGSize TransformSize (CGSize size)
{
return CGSizeApplyAffineTransform (size, this);
}
[DllImport (Constants.CoreGraphicsLibrary)]
public extern static CGAffineTransform CGAffineTransformInvert (CGAffineTransform t);
public CGAffineTransform Invert ()
{
return CGAffineTransformInvert (this);
}
#endif // !COREBUILD
}
}