Gradient, Bitmap and Svg Filling

1 files changed, 130 insertions, 0 deletions

diff --git a/src/Gradient.cs b/src/Gradient.cs
new file mode 100644
index 00000000..c521fd67
--- /dev/null
+++ b/src/Gradient.cs
@@ -0,0 +1,130 @@
+//
+//  Gradient.cs
+//
+//  Author:
+//       Jean-Philippe Bruyère <jp_bruyere@hotmail.com>
+//
+//  Copyright (c) 2016 jp
+//
+//  This program is free software: you can redistribute it and/or modify
+//  it under the terms of the GNU General Public License as published by
+//  the Free Software Foundation, either version 3 of the License, or
+//  (at your option) any later version.
+//
+//  This program is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//  GNU General Public License for more details.
+//
+//  You should have received a copy of the GNU General Public License
+//  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+using System;
+using System.Collections.Generic;
+
+namespace Crow
+{
+	public class Gradient : Fill
+	{
+		public enum Type
+		{
+			Vertical,
+			Horizontal,
+			Oblic,
+			Radial
+		}
+		public class ColorStop
+		{
+			public double Offset;
+			public Color Color;
+
+			public ColorStop(double offset, Color color){ 
+				Offset = offset;
+				Color = color;
+			}
+			public static object Parse(string s)
+			{
+				if (string.IsNullOrEmpty (s))
+					return null;
+				
+				string[] parts = s.Trim ().Split (':');
+
+				if (parts.Length > 2)
+					throw new Exception ("too many parameters in color stop: " + s);
+				
+				if (parts.Length == 2)
+					return new ColorStop (double.Parse (parts [0]), (Color)parts [1]);
+
+				return new ColorStop (-1, (Color)parts [0]);
+			}
+		}
+		public Gradient.Type GradientType = Type.Vertical;
+//		public double x0;
+//		public double y0;
+//		public double x1;
+//		public double y1;
+//		public double Radius1;
+//		public double Radius2;
+		public List<ColorStop> Stops = new List<ColorStop>();
+		public Gradient(Gradient.Type _type)
+		{
+			GradientType = _type;
+		}
+
+		#region implemented abstract members of Fill
+
+		public override void SetAsSource (Cairo.Context ctx, Rectangle bounds = default(Rectangle))
+		{
+			Cairo.Gradient grad = null;
+			switch (GradientType) {
+			case Type.Vertical:
+				grad = new Cairo.LinearGradient (bounds.Left, bounds.Top, bounds.Left, bounds.Bottom);
+				break;
+			case Type.Horizontal:
+				grad = new Cairo.LinearGradient (bounds.Left, bounds.Top, bounds.Right, bounds.Top);
+				break;
+			case Type.Oblic:
+				grad = new Cairo.LinearGradient (bounds.Left, bounds.Top, bounds.Right, bounds.Bottom);
+				break;
+			case Type.Radial:
+				throw new NotImplementedException ();
+			}
+
+			foreach (ColorStop cs in Stops)
+				grad.AddColorStop (cs.Offset, cs.Color);
+			
+			ctx.SetSource (grad);
+			grad.Dispose ();
+		}
+		#endregion
+
+		public static object Parse(string s)
+		{
+			if (string.IsNullOrEmpty (s))
+				return Color.White;
+
+			Crow.Gradient tmp;
+
+			string[] stops = s.Trim ().Split ('|');
+
+			switch (stops[0].Trim()) {
+			case "vgradient":
+				tmp = new Gradient (Type.Vertical);
+				break;
+			case "hgradient":
+				tmp = new Gradient (Type.Horizontal);
+				break;
+			case "ogradient":
+				tmp = new Gradient (Type.Oblic);
+				break;
+			default:
+				throw new Exception ("Unknown gradient type: " + stops [0]);
+			}
+
+			for (int i = 1; i < stops.Length; i++)
+				tmp.Stops.Add((ColorStop)ColorStop.Parse(stops[i]));
+
+			return tmp;
+		}
+	}
+}
+