arcgis api for flex之专题图制作（饼状图，柱状图等）
最近公司给我一个任务，就是利用arcgis api for flex实现在地图上点（业务数据）直接显示饼状图以及柱状图的专题图制作，而不是通过点击点显示气泡窗口的形式来实现，这个公司已经实现了。
经过一段时间的摸索，参照一些网上资源，目前大概弄出来了，里面还有待完善的地方的。
效果图如下：
（1）Chart.mxml，主要的展示地图专题图效果的页面
|
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
|
<?xml version=
"1.0"
encoding=
"utf-8"
?>
<s:Application xmlns:fx=
"http://ns.adobe.com/mxml/2009"
xmlns:s=
"library://ns.adobe.com/flex/spark"
xmlns:mx=
"library://ns.adobe.com/flex/mx"
xmlns:esri=
"http://www.esri.com/2008/ags"
pageTitle=
"Charts in infowindow"
xmlns:symbols=
"com.esri.ags.symbols.*"
>
<fx:Style>
.chartStyle
{
borderThickness:
0
;
infoPlacement: center;
backgroundAlpha:
0
;
infoOffsetX:
0
;
infoOffsetY:
0
;
paddingLeft:
0
;
paddingRight:
0
;
paddingTop:
0
;
paddingBottom:
0
;
}
</fx:Style>
<fx:Script>
<![CDATA[
import
com.esri.ags.geometry.MapPoint;
import
com.esri.ags.FeatureSet;
import
com.esri.ags.Graphic;
import
com.esri.ags.events.MapEvent;
import
com.esri.ags.tasks.QueryTask;
import
com.esri.ags.tasks.supportClasses.Query;
import
mx.collections.ArrayCollection;
import
mx.controls.Alert;
import
mx.events.FlexEvent;
import
mx.rpc.AsyncResponder;
protected
function
myMap_initializeHandler(event:MapEvent):
void
{
var
pie:MapPoint =
new
MapPoint(
113.55185
,
22.82289
);
var
column:MapPoint =
new
MapPoint(
113.59637985600011
,
22.758225999000047
);
var
bar:MapPoint =
new
MapPoint(
113.52757794
,
22.84012158
);
var
gpie:Graphic =
new
Graphic(pie);
var
gcolumn:Graphic =
new
Graphic(column);
var
gbar:Graphic =
new
Graphic(bar);
//g.attributes = new Object();
var
thematic:ArrayCollection =
new
ArrayCollection(
[
{ Name:
"危化品1"
, Rate:
25
},
{ Name:
"危化品2"
, Rate:
15
},
{ Name:
"危化品3"
, Rate:
23
}
]);
//g.attributes.thematic = thematic;
gpie.attributes = thematic;
gcolumn.attributes = thematic;
gbar.attributes = thematic;
this
.myGraphicsLayerpie.add(gpie);
this
.myGraphicsLayercolumn.add(gcolumn);
this
.myGraphicsLayerbar.add(gbar);
}
]]>
</fx:Script>
<fx:Declarations>
<esri:InfoSymbol id=
"infoSymbolpie"
infoRenderer=
"InfoRendererPieChart"
containerStyleName=
"chartStyle"
>
</esri:InfoSymbol>
<esri:InfoSymbol id=
"infoSymbolcolumn"
infoRenderer=
"InfoRendererColumnChart"
containerStyleName=
"chartStyle"
>
</esri:InfoSymbol>
<esri:InfoSymbol id=
"infoSymbolbar"
infoRenderer=
"InfoRendererBarChart"
containerStyleName=
"chartStylee"
>
</esri:InfoSymbol>
</fx:Declarations>
<esri:Map id=
"myMap"
load=
"myMap_initializeHandler(event)"
>
<esri:extent>
<esri:Extent xmin=
"113.284171273203"
ymin=
"22.6348519473499"
xmax=
"113.774816132605"
ymax=
"22.9103935318251"
>
<esri:spatialReference>
<esri:SpatialReference wkid=
"4326"
/>
</esri:spatialReference>
</esri:Extent>
</esri:extent>
<esri:ArcGISTiledMapServiceLayer url=
"http://localhost:6080/ArcGIS/rest/services/ns_new/MapServer"
/>
<esri:GraphicsLayer id=
"myGraphicsLayercolumn"
symbol=
"{infoSymbolcolumn}"
>
</esri:GraphicsLayer>
<esri:GraphicsLayer id=
"myGraphicsLayerpie"
symbol=
"{infoSymbolpie}"
>
</esri:GraphicsLayer>
<esri:GraphicsLayer id=
"myGraphicsLayerbar"
symbol=
"{infoSymbolbar}"
>
</esri:GraphicsLayer>
</esri:Map>
</s:Application>
|
（2）InfoRendererBarChart.mxml、InfoRendererColumnChart.mxml、InfoRendererPieChart.mxml，分别是柱状图以及饼状图实现的页面
1.InfoRendererBarChart.mxml
|
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
|
<?xml version=
"1.0"
encoding=
"utf-8"
?>
<s:VGroup xmlns:fx=
"http://ns.adobe.com/mxml/2009"
xmlns:s=
"library://ns.adobe.com/flex/spark"
xmlns:mx=
"library://ns.adobe.com/flex/mx"
clipAndEnableScrolling=
"true"
creationComplete=
"creationCompleteHandler()"
implements
=
"mx.core.IDataRenderer"
width=
"100"
height=
"100"
>
<!--
This
is
used by the QueryResultsWithChart sample.
-->
<fx:Script>
<![CDATA[
private
var
_data:
Object
;
[Bindable]
// implement IDataRenderer
public
function
get
data():
Object
{
return
_data;
}
public
function
set
data(value:
Object
):
void
{
_data = value;
}
private
function
creationCompleteHandler():
void
{
}
]]>
</fx:Script>
<mx:BarChart id=
"columnChart"
width=
"100%"
height=
"100%"
dataProvider=
"{data}"
showDataTips=
"true"
>
<mx:series>
<mx:BarSeries id=
"barSeries"
xField=
"Rate"
/>
</mx:series>
<mx:verticalAxis>
<mx:CategoryAxis id=
"barAxis"
categoryField=
"Name"
/>
</mx:verticalAxis>
<mx:verticalAxisRenderers>
<mx:AxisRenderer axis=
"{barAxis}"
showLabels=
"false"
/>
</mx:verticalAxisRenderers>
</mx:BarChart>
</s:VGroup>
|
2.InfoRendererColumnChart.mxml
|
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
|
<?xml version=
"1.0"
encoding=
"utf-8"
?>
<s:VGroup xmlns:fx=
"http://ns.adobe.com/mxml/2009"
xmlns:s=
"library://ns.adobe.com/flex/spark"
xmlns:mx=
"library://ns.adobe.com/flex/mx"
clipAndEnableScrolling=
"true"
creationComplete=
"creationCompleteHandler()"
implements
=
"mx.core.IDataRenderer"
width=
"100"
height=
"100"
>
<!--
This
is
used by the QueryResultsWithChart sample.
-->
<fx:Script>
<![CDATA[
private
var
_data:
Object
;
[Bindable]
// implement IDataRenderer
public
function
get
data():
Object
{
return
_data;
}
public
function
set
data(value:
Object
):
void
{
_data = value;
}
private
function
creationCompleteHandler():
void
{
}
]]>
</fx:Script>
<mx:ColumnChart id=
"columnChart"
width=
"100%"
height=
"100%"
dataProvider=
"{data}"
showDataTips=
"true"
>
<mx:series>
<mx:ColumnSeries id=
"columnSeries"
yField=
"Rate"
/>
</mx:series>
<mx:horizontalAxis>
<mx:CategoryAxis id=
"columnAxis"
categoryField=
"Name"
/>
</mx:horizontalAxis>
<mx:horizontalAxisRenderers>
<mx:AxisRenderer axis=
"{columnAxis}"
showLabels=
"false"
/>
</mx:horizontalAxisRenderers>
</mx:ColumnChart>
</s:VGroup>
|
3.InfoRendererPieChart.mxml
|
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
|
<?xml version=
"1.0"
encoding=
"utf-8"
?>
<s:VGroup xmlns:fx=
"http://ns.adobe.com/mxml/2009"
xmlns:s=
"library://ns.adobe.com/flex/spark"
xmlns:mx=
"library://ns.adobe.com/flex/mx"
clipAndEnableScrolling=
"true"
creationComplete=
"creationCompleteHandler()"
implements
=
"mx.core.IDataRenderer"
width=
"100"
height=
"100"
>
<!--
This
is
used by the QueryResultsWithChart sample.
-->
<fx:Script>
<![CDATA[
private
var
_data:
Object
;
[Bindable]
// implement IDataRenderer
public
function
get
data():
Object
{
return
_data;
}
public
function
set
data(value:
Object
):
void
{
_data = value;
}
private
function
creationCompleteHandler():
void
{
}
]]>
</fx:Script>
<mx:PieChart id=
"pieChart"
width=
"100%"
height=
"100%"
dataProvider=
"{data}"
showDataTips=
"true"
>
<mx:series>
<mx:PieSeries field=
"Rate"
labelPosition=
"callout"
nameField=
"Name"
>
</mx:PieSeries>
</mx:series>
</mx:PieChart>
</s:VGroup>
|
上述的总体实现思路是这样的：核心是InfoSymbol，InfoSymbol自定义infoRenderer绑定专题图的模版，比如InfoRendererBarChart.mxml、InfoRendererColumnChart.mxml、InfoRendererPieChart.mxml；程序初始化的时候生成了一些带有统计信息的Graphic添加到地图上，这些Graphic对象的attributes属性集合来保存各个统计的对象，每个统计的对象包含两个字段：Name表示危化品名称，Rate表示占有比重，下面我们会在InfoSymbol的定义中再次看到这两个字段。当定义好这些Graphic对象以后，我们就可以把它们添加到设置了InfoSymbol符号的GraphicLayer上了。在InfoSymbol的定义中，我们可以看到，在这个InfoSymbol中添加了一个饼图组件PieChart，这个饼图的dataProvider属性绑定的是{data}，它代表的其实就是Graphic对象的attributes属性。你可以简单地这样认为：InfoSymbol中的data代表的就是其对应的Graphic对象的attributes属性。其他的柱状图也是同理的。
既然在InfoSymbol中可以获得Graphic的属性信息，那么根据Graphic的属性信息来绘制不同的专题图就是水到渠成的事情了。
样式代码解析：
|
1
2
3
4
5
6
7
8
9
10
11
12
|
.chartStyle
{
borderThickness:
0
;
/*显示专题图的边框宽度*/
infoPlacement: center;
/*显示专题图的位置，这里是中心*/
backgroundAlpha:
0
;
/*显示专题图的背景透明度，这里设置为0，是为了隐藏背景*/
infoOffsetX:
0
;
/*显示专题图的X偏移，设置0，不然会偏离原始点位置*/
infoOffsetY:
0
;
/*显示专题图的Y偏移，设置0，不然会偏离原始点位置*/
paddingLeft:
0
;
/*显示专题图的位置偏移，设置0，不然会偏离原始点位置*/
paddingRight:
0
;
/*显示专题图的位置偏移，设置0，不然会偏离原始点位置*/
paddingTop:
0
;
/*显示专题图的位置偏移，设置0，不然会偏离原始点位置*/
paddingBottom:
0
;
/*显示专题图的位置偏移，设置0，不然会偏离原始点位置*/
}
|
需要完善优化之处：目前GraphicsLayer定义了三个（pie，bar，column),然后各自绑定不同的infoSymbol（pie，bar，column)。这样显的有点冗余了，其实只要定义一个GraphicsLayer，然后动态的判断绑定的是哪个infoSymbol。
备注：
GIS技术交流QQ群：432512093
GIS团队成员均来自各高校毕业的研究生，有着丰富的GIS开发与应用经验。店铺提供GIS开发源代码、技术文档、地图数据、软件包等多种产品。无论你是GIS专业在校生、GIS爱好者，还是GIS行业相关从业人员，相信你们均可在本店中找到令你满意的商品。 除了已经展示的产品外，本店也根据客户的需求提供相应产品的定制开发服务，包括GIS课程设计、GIS毕业设计以及GIS软件应用方面的开发等。联系方式:406503412