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。