Re: [Geotools-gt2-users] i have problem to change style in mapdisplaylab for 2 IDs

[dadar <iam...@ya...>]

> thx jody
> what i want is:
> 1. how can i create array of Set<FeatureId>??
>
> i declared it like this
>             Set<FeatureId> [] IDs;
> after that when i try to fill []
>             IDs= new Set<FeatureId> [2];
> there is an error generic array creation
> am i wrong when i declared it?

> To create a FeatureId you need to use a FilterFactory - but I think  
> you got that part.
> The method should accept a single Set<FeatureId> (not an array of  
> Set<FeatureId> ). My first reply showed how to create a HashSet; do  
> you need more information on how to use the  java collection classes;  
> why are you using an array?

jody, i'm trying to change some of the class in MapDisplayLab so i can use
it for my program like this one:
	void selectFeatures(double [] posisix, double [] posisiy)
so i sent an array of some area position in the map after i calculate it,
after this i want to change the color of area based in the position that i
sent.
In the displaySelectedFeatures we use IDs to set the style so i think maybe
i need to make an array of Set<FeatureId> to do it and sent it (change the
parameter
in displaySelectedFeatures into 
public void displaySelectedFeatures(Set<FeatureId> [] IDs) )
what do u think? am i wrong with my thought?

> 2. how can i change the color of two area in map?
>
> what i mean is like in MapDisplayClass there is SelectFeature that  
> change the color of the area when we click it
> is same like that but i want two area at the same time change its  
> color
> i tried to change the code like this but only the last IDs that  
> change the color
> how can i set the style of two area at the same time??

> The example method createSelectedStyle( IDs ) is an example. Go into  
> that method and see how it makes a Style? You will need to make your  
> own Style; your Style should have two rules; one for each feature you  
> want to isolate for special treatment; each Rule will have a different  
> list of symbolizers descrbing how to draw the features that match that  
> Rule.

> You may wish to read the StyleLayerDescriptor specification which  
> contains examples of how to define a style in xml.

I understand that createSelectedStyle (IDs) is method to set style based in
IDs before diplaying it in map
what i need is how can I set 2 or more IDs style, then displaying it 
		if (IDs.isEmpty()) {
                style = createDefaultStyle();
				mapFrame.getMapContext().getLayer(0).setStyle(style);
            } else {
                style = createSelectedStyle(IDs);
				mapFrame.getMapContext().getLayer(0).setStyle(style);
            }

        if (IDs2.isEmpty()) {
                style = createDefaultStyle();
				mapFrame.getMapContext().getLayer(0).setStyle(style);
            } else {
                style = createSelectedStyle(IDs2);
				mapFrame.getMapContext().getLayer(0).setStyle(style);
            }
			
        mapFrame.getMapPane().repaint();
		
i try to change the source code in displaySelectedFeatures like above
so i sent 2 IDs and set the style before i repaint it
all i get is only IDs2 color that change into yellow color
how do i get both of it (IDs and IDs2) change color into yellow
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