Re: [Geotools-gt2-users] Geotools custom drawing callback

[LSA <ls...@ng...>]

Hi, Michael,

I tried the following code to draw rectangle around each feature:

mapPane.getRenderer().addRenderListener(new RenderListener() {

             @Override
             public void featureRenderer(SimpleFeature feature) {
               AffineTransform transform = 
RendererUtilities.worldToScreenTransform(
                   mapPane.getMapContext().getAreaOfInterest(),
                   mapPane.getVisibleRect());

               Graphics2D g = ((Graphics2D) mapPane.getGraphics());

               if 
(!org.apache.commons.lang.ArrayUtils.isEmpty(((Geometry)feature.getDefaultGeometry()).getBoundary().getCoordinates())){
                 Coordinate c  = 
((Geometry)feature.getDefaultGeometry()).getBoundary().getCoordinates()[0];
                 Point2D point = new Point2D.Double(c.x, c.y);
                 Point2D result = new Point2D.Double();
                 transform.transform(point, result);

                 g.setColor(Color.BLUE);
                 g.drawRect((int)result.getX(), (int)result.getY(), 20, 20);
               }

               
//UiGisUtils.highlightFeatureOnMap(ShapeFileRendererComposite.this, 
feature, Color.YELLOW, 11);
             }

             @Override
             public void errorOccurred(Exception arg0) {
             }
           });

Rectangles appear around some features for a moment only to dissapear 
after it...

What am I doing wrong?

Sergey

On 9/27/2010 5:08 PM, Michael Bedward wrote:
> Hi Sergey,
>
> Have a look at the RenderListener interface (in gt-render module)
> which has a featureRenderer method that is called by the renderer each
> time a feature is rendered. That method gets the feature passed to it
> as an argument.
>
> Michael
>
> On 27 September 2010 19:44, LSA<ls...@ng...>  wrote:
>    
>> Hi,
>>
>> I am using geotools 2.6.3.
>>
>> What I need to do is to draw some custom drawing near each feature. For
>> now, I perform this task by using MapPaneListener.onRenderingStopped,
>> but this impose performance penalty.
>> Is it possible to register some sort of callback, which will be called
>> every time feature is rendered?. In this callback, I would like to have
>> links to Graphics2D and Feature (but maybe something different will
>> work, too).
>>
>> Thanks in advance,
>> Sergey
>>
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