SuperMap iClient for Silverlight API基础开发之自定义Action画双线
SuperMap.Web 程序集提供了 MapAction 类，其子类有 DrawCircle、DrawLine、DrawPolygon、Pan、ZoomIn、ZoomOut、Edit 等。如果这些 Action 不能满足用户需求，则可以从 MapAction 继承进行扩展，也可以从其子类继承进行扩展。在扩展的类中重写父类的方法就可以了。
今天闲着无聊，正好有人说要画双线，就顺便实现一下，用法和其他的Action都是一样的：
1 private void test_Click(object sender , RoutedEventArgs e)
2 {
3 DrawMultiLine drawMultiLine = new DrawMultiLine(MyMap , 500000);
4 drawMultiLine.DrawCompleted += new EventHandler<DrawEventArgs>(drawMultiLine_DrawCompleted);
5 MyMap.Action = drawMultiLine;
6 }
7
8 void drawMultiLine_DrawCompleted(object sender , DrawEventArgs e)
9 {
10 Feature f = new Feature();
11 f.Geometry = e.Geometry;
12 featuresLayer.AddFeature(f);
13 }
这是实现画双线的类：
1 public class DrawMultiLine : MapAction , IDrawStyle
2 {
3 public event EventHandler<DrawEventArgs> DrawCompleted;
4 private Feature feature;
5 private Point2DCollection points;
6 private Point2DCollection pointsMulti;
7
8 private bool isActivated;
9 private bool isDrawing;
10 private double _Distance;
11
12 public DrawMultiLine(Map map , double distance)
13 : base(map , "DrawMultiLine" , Cursors.Arrow)
14 {
15 if (distance <= 0)
16 {
17 throw new Exception("distance");
18 }
19 _Distance = distance;
20
21 Stroke = new SolidColorBrush(Colors.Red);
22 StrokeThickness = 1;
23 Opacity = 1;
24 }
25
26 private void Activate(Point2D firstPoint , Point2D secPoint)
27 {
28 DrawLayer = new FeaturesLayer();
29 if (Map.Layers == null)
30 {
31 return;
32 }
33 Map.Layers.Add(DrawLayer);
34
35 feature = new Feature();
36
37 points = new Point2DCollection();
38 pointsMulti = new Point2DCollection();
39
40 feature.Geometry = new GeoLine
41 {
42 Parts = new ObservableCollection<Point2DCollection>
43 {
44 points ,
45 pointsMulti
46 }
47 };
48
49 points.Add(firstPoint);
50 points.Add(firstPoint);
51
52 pointsMulti.Add(secPoint);
53 pointsMulti.Add(secPoint);
54
55 DrawLayer.Features.Add(feature);
56
57 isDrawing = true;
58 isActivated = true;
59 }
60 public override void OnMouseLeftButtonDown(MouseButtonEventArgs e)
61 {
62 Point2D item = Map.ScreenToMap(e.GetPosition(Map));
63 Point2D item2 = new Point2D(item.X + _Distance , item.Y + _Distance);
64 if (!isActivated)
65 {
66 this.Activate(item , item2);
67 }
68 else
69 {
70 points.Add(item);
71 pointsMulti.Add(item2);
72 }
73 e.Handled = true;
74
75 base.OnMouseLeftButtonDown(e);
76 }
77 public override void OnMouseMove(MouseEventArgs e)
78 {
79 if (isDrawing)
80 {
81 Point2D item = Map.ScreenToMap(e.GetPosition(Map));
82
83 points.RemoveAt(points.Count - 1);
84 points.Add(item);
85
86 pointsMulti.RemoveAt(pointsMulti.Count - 1);
87 pointsMulti.Add(new Point2D(item.X + _Distance , item.Y + _Distance));
88 }
89 base.OnMouseMove(e);
90 }
91 public override void OnDblClick(MouseButtonEventArgs e)
92 {
93 endDraw();
94 e.Handled = true;
95 base.OnDblClick(e);
96 }
97 private void endDraw( )
98 {
99 if (points != null && pointsMulti != null)
100 {
101
102 GeoLine geoLine = new GeoLine();
103 geoLine.Parts.Add(points);
104 geoLine.Parts.Add(pointsMulti);
105 DrawEventArgs args = new DrawEventArgs
106 {
107 DrawName = Name ,
108 Element = null ,
109 Geometry = geoLine
110 };
111
112 Deactivate();
113 OnDrawCompleted(args);
114 }
115 }
116 private void OnDrawCompleted(DrawEventArgs args)
117 {
118 if (DrawCompleted != null)
119 {
120 DrawCompleted(this , args);
121 }
122 }
123 public override void Deactivate( )
124 {
125 isActivated = false;
126 isDrawing = false;
127 pointsMulti = null;
128 points = null;
129 if (DrawLayer != null)
130 {
131 DrawLayer.Features.Clear();
132 }
133 if (Map != null && Map.Layers != null)
134 {
135 Map.Layers.Remove(DrawLayer);
136 }
137 }
138
139 private FeaturesLayer DrawLayer { get; set; }
140 public FillRule FillRule { get; set; }
141
142 #region IDrawStyle 成员
143
144 public Brush Fill { get; set; }
145
146 public Brush Stroke { get; set; }
147
148 public double StrokeThickness { get; set; }
149
150 public double StrokeMiterLimit { get; set; }
151
152 public double StrokeDashOffset { get; set; }
153
154 public DoubleCollection StrokeDashArray { get; set; }
155
156 public PenLineCap StrokeDashCap { get; set; }
157
158 public PenLineCap StrokeEndLineCap { get; set; }
159
160 public PenLineCap StrokeStartLineCap { get; set; }
161
162 public PenLineJoin StrokeLineJoin { get; set; }
163 public double Opacity { get; set; }
164
165
166 #endregion
167 }
效果如图：
其他画多线也类似了。
