Free cookie consent management tool by TermsFeed Policy Generator

source: branches/HeuristicLab.Problems.GrammaticalOptimization/SharpVectorRenderingWpf/Wpf/WpfGroupRendering.cs @ 13949

Last change on this file since 13949 was 12762, checked in by aballeit, 9 years ago

#2283 GUI updates, Tree-chart, MCTS Version 2 (prune leaves)

File size: 3.8 KB
Line 
1using System;
2using System.Linq;
3using System.Text;
4using System.Diagnostics;
5using System.Collections.Generic;
6
7using System.Windows;
8using System.Windows.Media;
9
10using SharpVectors.Dom.Svg;
11using SharpVectors.Runtime;
12
13namespace SharpVectors.Renderers.Wpf
14{
15    public sealed class WpfGroupRendering : WpfRendering
16    {
17        #region Private Fields
18
19        private DrawingGroup _drawGroup;
20
21        #endregion
22
23        #region Constructors and Destructor
24
25        public WpfGroupRendering(SvgElement element)
26            : base(element)
27        {
28        }
29
30        #endregion
31
32        #region Public Methods
33
34        public override void BeforeRender(WpfDrawingRenderer renderer)
35        {
36            base.BeforeRender(renderer);
37
38            WpfDrawingContext context = renderer.Context;
39            _drawGroup = new DrawingGroup();
40
41            string elementId = this.GetElementName();
42            if (!String.IsNullOrEmpty(elementId) && !context.IsRegisteredId(elementId))
43            {
44                _drawGroup.SetValue(FrameworkElement.NameProperty, elementId);
45
46                context.RegisterId(elementId);
47
48                if (context.IncludeRuntime)
49                {
50                    SvgObject.SetId(_drawGroup, elementId);
51                }
52            }
53
54            DrawingGroup currentGroup = context.Peek();
55
56            if (currentGroup == null)
57            {
58                throw new InvalidOperationException("An existing group is expected.");
59            }
60
61            currentGroup.Children.Add(_drawGroup);
62            context.Push(_drawGroup);
63        }
64
65        public override void Render(WpfDrawingRenderer renderer)
66        {
67            if (_drawGroup != null)
68            {
69                Geometry clipGeom = this.ClipGeometry;
70                if (clipGeom != null)
71                {
72                    _drawGroup.ClipGeometry = clipGeom;
73                }
74
75                Transform transform = this.Transform;
76                if (transform != null)
77                {
78                    _drawGroup.Transform = transform;
79                }
80
81                float opacityValue = -1;
82
83                SvgGElement element = (SvgGElement)_svgElement;
84                string opacity = element.GetAttribute("opacity");
85                if (opacity != null && opacity.Length > 0)
86                {
87                    opacityValue = (float)SvgNumber.ParseNumber(opacity);
88                    opacityValue = Math.Min(opacityValue, 1);
89                    opacityValue = Math.Max(opacityValue, 0);
90                }
91
92                if (opacityValue >= 0)
93                {
94                    _drawGroup.Opacity = opacityValue;
95                }
96            }
97
98            base.Render(renderer);
99        }
100
101        public override void AfterRender(WpfDrawingRenderer renderer)
102        {
103            Debug.Assert(_drawGroup != null);
104
105            WpfDrawingContext context = renderer.Context;
106
107            DrawingGroup currentGroup = context.Peek();
108
109            if (currentGroup == null || currentGroup != _drawGroup)
110            {
111                throw new InvalidOperationException("An existing group is expected.");
112            }
113
114            // Remove the added group from the stack...
115            context.Pop();
116
117            // If the group is empty, we simply remove it...
118            if (_drawGroup.Children.Count == 0 && _drawGroup.ClipGeometry == null &&
119                _drawGroup.Transform == null)
120            {
121                currentGroup = context.Peek();
122                if (currentGroup != null)
123                {
124                    currentGroup.Children.Remove(_drawGroup);
125                }
126            }
127
128            base.AfterRender(renderer);
129        }
130
131        #endregion
132    }
133}
Note: See TracBrowser for help on using the repository browser.