近期公司给我一个任务,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做。而不是经过点击点显示气泡窗体的形式来实现。这个公司已经实现了。html
通过一段时间的摸索,參照一些网上资源,眼下大概弄出来了,里面还有待无缺的地方的。git
效果图例如如下:github
(1)Chart.mxml,基本的展现地图专题图效果的页面 api
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<?xml version=
"1.0"
encoding=
"utf-8"
?
<s:Application xmlns:fx=
"http://ns.adobe.com/mxml/2009"
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。各自是柱状图以及饼状图实现的页面post
1.InfoRendererBarChart.mxmlflex
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<?xml version=
"1.0"
encoding=
"utf-8"
?>
<s:VGroup xmlns:fx=
"http://ns.adobe.com/mxml/2009"
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 优化
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<?xml version=
"1.0"
encoding=
"utf-8"
?>
<s:VGroup xmlns:fx=
"http://ns.adobe.com/mxml/2009"
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.mxmlthis
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<?xml version=
"1.0"
encoding=
"utf-8"
?>
<s:VGroup xmlns:fx=
"http://ns.adobe.com/mxml/2009"
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种:核心是InfoSymbol。InfoSymbol本身定义infoRenderer绑定专题图的模版。比方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加入到地图上。这些Graphic对象的attributes属性集合来保存各个统计的对象,每个统计的对象包括两个字段:Name表示危化品名称,Rate表示占有比重,如下咱们会在InfoSymbol的定义中再次看到这两个字段。当定义好这些Graphic对象之后,咱们就可以把它们加入到设置了InfoSymbol符号的GraphicLayer上了。在InfoSymbol的定义中,咱们可以看到,在这个InfoSymbol中加入了一个饼图组件PieChart,这个饼图的dataProvider属性绑定的是{data},它表明的事实上就是Graphic对象的attributes属性。你可以简单地这样以为:InfoSymbol中的data表明的就是其相应的Graphic对象的attributes属性。url
其它的柱状图也是同理的。
既然在InfoSymbol中可以得到Graphic的属性信息,那么依据Graphic的属性信息来绘制不一样的专题图就是水到渠成的事情了。
样式代码解析:
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.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。否则会偏离原始点位置*/
infoOffsetY:
0
;
/*显示专题图的Y偏移,设置0,否则会偏离原始点位置*/
paddingLeft:
0
;
/*显示专题图的位置偏移,设置0,否则会偏离原始点位置*/
paddingRight:
0
;
/*显示专题图的位置偏移,设置0。否则会偏离原始点位置*/
paddingTop:
0
;
/*显示专题图的位置偏移。设置0,否则会偏离原始点位置*/
paddingBottom:
0
;
/*显示专题图的位置偏移,设置0,否则会偏离原始点位置*/
}
|
需要无缺优化之处:眼下GraphicsLayer定义了三个(pie,bar。column),而后各自绑定不一样的infoSymbol(pie,bar,column)。这样显的有点冗余了,事实上仅仅要定义一个GraphicsLayer,而后动态的推断绑定的是哪一个infoSymbol。
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