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Re: [udig-devel] How to use MapGraphic to draw a graph
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Does the mapgraphic appear in the list of decoration objects?
You have to pull it on the map to be drawn.
Andrea
On Thu, Feb 17, 2011 at 4:42 AM, Fred Chen <fredcfz@xxxxxxxxxxx> wrote:
> Hi,
>
> I want to implement a zoom in/zoom out bar. It is something like the
> vertical bar in google maps. The map will be zoom in or out when users
> clicks on the bar.
>
> I am trying to implement the net.refractions.udig.mapgraphic.MapGraphic
> interface to draw the bar. So I followed the
> net.refractions.udig.tutorials.mapgraphic example and created my own
> mapgraphic.
>
> Firstly, I created ZoomBarMapGraphic class which implements MapGrahic
>
> public class ZoomBarMapGraphic implements MapGraphic{
>
> @Override
> public void draw(MapGraphicContext context) {
> //draw the zoom bar here
> }
> }
>
> Secondly, I added the class to the extension point:
> net.refractions.udig.mapgraphic.mapgraphic
> <extension
> point="net.refractions.udig.mapgraphic.mapgraphic">
> <mapGraphic
>
> class="net.refractions.udig.tutorials.customapp.ssds.ZoomBarMapGraphic"
> id="net.refractions.udig.tutorials.customapp.mapGraphic1">
> </mapGraphic>
> </extension>
>
> And then, I try to run the application. But It didn't draw anything.
> Actually, the ZoomBarMapGraphic.draw(MapGraphicContext context) method is
> not called.
>
> Do I miss anything here? Can anybody help me out of here?
>
> Thank you in advance.
>
> Derek
>
> _______________________________________________
> User-friendly Desktop Internet GIS (uDig)
> http://udig.refractions.net
> http://lists.refractions.net/mailman/listinfo/udig-devel
>
>
