1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
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;
}
}
}
|
