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//
// GradientBackendHandler.cs
//
// Author:
// Eric Maupin <ermau@xamarin.com>
//
// Copyright (c) 2012 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.Collections.Generic;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Linq;
using Xwt.Backends;
using Color = Xwt.Drawing.Color;
using DrawingColor = System.Drawing.Color;
namespace Xwt.WPFBackend
{
public class GradientBackendHandler
: Backend, IGradientBackendHandler
{
public object CreateLinear (double x0, double y0, double x1, double y1)
{
return new LinearGradient (
new PointF ((float) x0, (float) y0),
new PointF ((float) x1, (float) y1));
}
public object CreateRadial (double cx0, double cy0, double radius0, double cx1, double cy1, double radius1)
{
return new RadialGradient (cx0, cy0, radius0, cx1, cy1, radius1);
}
public void AddColorStop (object backend, double position, Color color)
{
((GradientBase)backend).ColorStops.Add (new Tuple<double, Color> (position, color));
}
}
internal class RadialGradient
: GradientBase
{
GraphicsPath path;
double cx0, cy0, r0;
double cx1, cy1, r1;
public RadialGradient (double cx0, double cy0, double radius0, double cx1, double cy1, double radius1)
{
this.cx0 = cx0;
this.cy0 = cy0;
this.r0 = radius0;
this.cx1 = cx1;
this.cy1 = cy1;
this.r1 = radius1;
}
public override Brush CreateBrush ()
{
var path = new GraphicsPath ();
path.AddEllipse (new RectangleF ((float)(cx0 - r0), (float)(cy0 - r0), (float)(r0 * 2), (float)(r0 * 2)));
var brush = new PathGradientBrush (path);
var orderedStops = ColorStops.OrderBy (t => t.Item1).ToArray ();
var colors = orderedStops.Select (i => i.Item2.ToDrawingColor ()).ToArray ();
var stops = orderedStops.Select (i => (float) (i.Item1)).ToArray ();
brush.InterpolationColors = new ColorBlend (colors.Length) {
Colors = colors,
Positions = stops
};
return brush;
}
}
internal class LinearGradient
: GradientBase
{
public LinearGradient (PointF start, PointF end)
{
Start = start;
End = end;
}
public override System.Drawing.Brush CreateBrush ()
{
if (ColorStops.Count == 0)
throw new ArgumentException ();
var stops = ColorStops.OrderBy (t => t.Item1).ToArray ();
var first = stops[0];
var last = stops[stops.Length - 1];
var brush = new System.Drawing.Drawing2D.LinearGradientBrush (Start, End, first.Item2.ToDrawingColor (),
last.Item2.ToDrawingColor ());
return brush;
}
internal readonly PointF Start;
internal readonly PointF End;
}
internal abstract class GradientBase
{
internal readonly List<Tuple<double, Color>> ColorStops = new List<Tuple<double, Color>> ();
public abstract Brush CreateBrush ();
}
}
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