Re: [OpenMap Users] AreaShapeLayer questions

HI Paul,

On Thursday, November 21, 2002, at 02:41 AM, Paul Chisholm wrote:

> Hi,
>
> I have been experimenting with AreaShapeLayer. From what I see it
> allows you
> to display objects in the shape file in different ways depending on
> some
> attribute value. I have managed to display edges in a shape file that
> represents roads in different ways based on the road type. One
> question. I
> dont want to display certains types of road. If I just add attributes
> to the
> openmap.properties file for the values I am interested in, the other
> values
> are displayed using the default edge colour for the layer. The only
> way I
> can see to not display the data I am not interested in is to make the
> default edge colour for the layer transparent. However, this seems
> rather
> inefficient because it still has to process all the data I am not
> interested
> in. Is there any way to tell OpenMap to just ignore the data that does
> not
> match one of the '<layer>.areas.<value>=...' in the properties file?

There isn't a way to do this right now with the current code. That
wouldn't be a difficult code change, though. You would modify the
AreaHandler.

- Don

> To be more concrete, say the following is in the properties file:
>
> roadl.class=com.bbn.openmap.layer.shape.areas.AreaShapeLayer
> roadl.prettyName=Roads
> roadl.shapeFile=../shape/transportation/roadl.shp
> roadl.spatialIndex=../shape/transportation/roadl.ssx
> roadl.csvFile=../shape/transportation/roadl.csv
> roadl.csvFileHasHeader=true
> roadl.keyIndex=13
> roadl.areas=14 15 16
> roadl.areas.14.lineColor=ffff0000
> roadl.areas.14.lineWidth=2
> roadl.areas.15.lineColor=ffff0000
> roadl.areas.15.lineWidth=1
> roadl.areas.16.lineColor=ffff0000
> roadl.areas.16.lineWidth=3
>
> The properties specify I am interested in values 14, 15 and 16 which
> are
> displayed in red with varying thickness. The CSV file also has values
> 0 and
> 999 in column 13 which are displayed in black. When I make the default
> edge
> colour transparent the 0 and 999 values (which make up over 65% of the
> CSV
> file) are no longer visible, but it seems to take just as long to
> render the
> layer as when 0 and 999 are visible.
>
> One other thing. The 'nameIndex' attribute allows you to identify a
> name for
> an object which is displayed on the info line in gestures mouse mode.
> Is
> there an easy way to display this name in the area layer itself beside
> the
> object?

In the AreaShapeLayer.mouseMoved() method, instead of
fireRequestInfoLine, you could call fireRequestToolTip().

Hope this helps,

Don

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Don Dietrick, BBN Technologies, dietrick@bbn.com
10 Moulton Street, Cambridge, MA 02138
617-873-3031 [fax]-2794
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