Re: [Geotools-gt2-users] : Legend in geotools

[Rakshit M. <ra...@th...>]

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Ahh. ,
Actually in my case, it was required to change the code of JMapFrame.
So I could not make it pluggable.
But I can give you an idea what it was doing :
- for the color expression, call one function which will create an HashMap<Object,Color>
Object : attribute which needs to be coloured
Color : the unique color generated according to value of attribute. .
Now, from the user, the system will ask about new values of Text to display in front of color and I created a Resizable and draggable JPanel which shows final result as a table with Color - String pairs which is having a transparent background.
So, that was my way of representing legend and by making a draggable and resizable JPanel, we could make it more user friendly.

Hope I was clear and my way helped you a bit.
Please let me know if I made any silly mistake or chose a longer way.

Thank you,
Rax


________________________________
Best regards,Rakshit Majithiya
Techno geek, Web Developer,Code Lover
email : ra...@th...
blog : http://thetechtime.com
skype : rakshit.majithiya


________________________________
 From: Kakpo Adoko <ad...@ho...>
To: ra...@th... 
Sent: Monday, 26 March 2012 4:06 PM
Subject: RE: : [Geotools-gt2-users] Legend in geotools
 

 
Hi Rax,

Nice to hear from you. My approach for showing different colours to features was based:

1) Reading features attributes with Expression:

Expression expr = ff.property("attrName");
String  attrName  = expr.evaluate( feature, String.class );

2) And a between rule creation:

Filter filter = ff.between(ff.property(attrName), ff.literal(thres[i]),ff.literal(thres[i+1]));
rule.setFilter(filter);

* thres[i] being the integer array containing attribute values defining the bandwidths.

How did you develop the legend module? Can it be used as plug-in?

Thanks.

Regards,
Kakpo



> Date: Mon, 26 Mar 2012 18:07:52 +0800
> From: ra...@th...
> Subject: Re:: [Geotools-gt2-users] Legend in geotools
> To: ad...@ho...
> 
> 
> hello !!
> I've developed legend module using geotools.
> For this purpose, basically I've used colour function.
> Can you let me know about your approach to show different colors according to features ??
> 
> Thanks,
> Rax
> ------------------------------
>  On Mon 26 Mar, 2012 3:05 PM IST Kakpo Adoko wrote:
> 
>  >
>  >Hi All,
>  >I am trying to develop a small shapefile application with Geotools (version 2.7.1). Currently, I am able to show the map colour-coded by polygon attributes (eg. population density, etc). 
>  >How can I display the map's legend annotated by colour band?
>  >I look forward to hearing from you.
>  >Many thanks in advance,
>  >Kakpo AdokoPhD researcher,TU DelftThe Netherlands