Re: [Geotools-gt2-users] Choropleth map legend

[Jody G. <jod...@gm...>]

We have some instructions (in GitHub) on how to contribute:
https://github.com/geotools/geotools/blob/master/CONTRIBUTING.md

TLDR: Need to ask you to email a "code contribution license" to OSGeo so
they are cool with us accepting work from you.

Ideally you would create a JIRA issue (and attach the source code to the
issue).

I will package it up as a page for our user guide ... I am actually super
happy you got DirectLayer to work - I have been wanting to add a tutorial
on that one for a while.
--
Jody




--
Jody Garnett

On 19 December 2014 at 09:20, Hal Mirsky <hm...@as...> wrote:

> Hi Jody,
>
>
>
> Resending to the list.
>
>
>
> I have an example program that illustrates how to put a legend on a map
> that I can share.
>
>
>
> The program allows the user to open one or more Shapefiles and specify
> style information for each one.  It then creates a legend layer using the
> feature types and styles.  The main program is a modified version of
> StyleLab.  The legend is a subclass of DirectLayer.  There are also a few
> ‘helper’ classes to make this a standalone demo.
>
>
>
> What’s the next step to post the example?
>
>
>
> Thanks,
>
> Hal
>
>
>
>
>
> *From:* Jody Garnett [mailto:jod...@gm...]
> *Sent:* Thursday, November 27, 2014 3:29 PM
> *To:* Hal Mirsky
> *Cc:* Andy Turner; geotools geotools-gt2-users@lists. sourceforge. net
> *Subject:* Re: [Geotools-gt2-users] Choropleth map legend
>
>
>
> That would be a killer example for the docs Hal - are you in position to
> share your code?
>
>
> Jody Garnett
>
>
>
> On Tue, Nov 25, 2014 at 2:22 PM, Hal Mirsky <hm...@as...> wrote:
>
> Andy,
> I derived a class from DirectLayer and implemented the draw method which
> worked great.
>
> Some of the legend text was dynamic (e.g. low/high values for each color).
> A little interesting to figure out the size of rectangles I needed to draw
> for each legend item.  Here's a snippet:
>
> private Font titlef = new Font("Ariel", Font.BOLD, 12);
> private Font itemf  = new Font("Ariel", Font.BOLD, 10);
>
> Rectangle2D titleLabelRect = titlef.getStringBounds(title, new
> FontRenderContext(null, RenderingHints.VALUE_TEXT_ANTIALIAS_DEFAULT,
> RenderingHints.VALUE_FRACTIONALMETRICS_DEFAULT));
>
> Rectangle2D itemLabelRect = itemf.getStringBounds(label, new
> FontRenderContext(null, RenderingHints.VALUE_TEXT_ANTIALIAS_DEFAULT,
> RenderingHints.VALUE_FRACTIONALMETRICS_DEFAULT));
>
> // now get the height of the title rectangle and height to use for each
> legend item:
>
> th = (int) titleLabelRect.getHeight();
> ih = (int) itemLabelRect.getHeight();  // height of site label.  Also used
> as icon size
>  ...
>
> Hope this helps,
> Hal
>
> -----Original Message-----
> From: Andy Turner [mailto:A.G...@le...]
> Sent: Tuesday, November 25, 2014 11:36 AM
> To: geo...@li...
> Subject: [Geotools-gt2-users] Choropleth map legend
>
> Hi,
>
> I would like to have a map legend for the choropleth maps I am generating,
> please will you help?
>
> To style the main part of the map I have followed an example using
> ColorBrewer and FilterFactory2. I have a Classifier by calling evaluate on
> a
> Function from the FilterFactory2.
>
> I've have searched and found others asking about this [1], but no answers.
>
> [1]
>
> http://gis.stackexchange.com/questions/22962/create-a-color-scale-legend-for
> -choropleth-map-using-geotools-or-other-open-sou
>
> Thanks,
>
> Andy
> http://www.geog.leeds.ac.uk/people/a.turner/index.html
>
>
>
>
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