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
131
132
133
134
135
136
|
//
// Gradient.cs
//
// Author:
// Jean-Philippe Bruyère <jp.bruyere@hotmail.com>
//
// Copyright (c) 2013-2017 Jean-Philippe Bruyère
//
// 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;
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;
}
}
}
|
