Re: [udig-devel] How to use MapGraphic to draw a graph

[Jody Garnett <jody.garnett@xxxxxxxxx>]

There is also the "glass pane" which is used to render with draw2d over top of the rest of the rendering system. See the "tracking" tutorial here for an example: http://udig.refractions.net/confluence/display/DEV/2+Training+Materials

The interesting part for you will be sorting out if your zoom in / zoom out bar is clicked on. I am not quite sure how you want to handle that?

Jody

-- 
Jody Garnett

On Thursday, 17 February 2011 at 8:09 PM, andrea antonello wrote:

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

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_______________________________________________
User-friendly Desktop Internet GIS (uDig)
http://udig.refractions.net
http://lists.refractions.net/mailman/listinfo/udig-devel