[maplab-users] How do you display a layer by attribute?

[Ken Sanderson]

Chris,

Thanks for the reply. I am actually using Chameleon, or rather have
intentions to use. I set up Chameleon and got it all working with the
samples and I am now going through the steps of creating my own map file
with my data, thus using maplab to get things setup. I am not that
familiar with map files yet, but from your post I gather I have done all
that I need to do as far as setting up the map file so that in Chameleon
I can have the legend display each class?

Thanks again,

Ken

-----Original Message-----
From: maplab-users-bounces at lists.maptools.org
[mailto:maplab-users-bounces at lists.maptools.org] On Behalf Of
Christopher R. Thorne
Sent: June 25, 2004 12:40 PM
Cc: maplab-users at lists.maptools.org
Subject: Re: [maplab-users] How do you display a layer by attribute?


Ken,
Your Question: In short how can I have a color for each class listed in 
the legend under that particular layer?

In mapedit preview and gmap factory (ie. maplab) it is not flexible (a 
side from going into the code of maplab, or editing your final outputted

gmap factory) in displaying classes within a mapfile.

The easiest way in maplab would be to set up a Layer for each defined 
class you wish to display.

But if you want to build a web application that can handle legend 
classes, I would personally use the chameleon technology found on 
www.maptools.org. This allows you to personally configure your own web 
application  with the mapfile you created in mapedit, knowing little of 
php_mapscript/mapserver.

If you are interested in Chameleon than the "Chameleon widget" That can 
do the job for you would be the "LegendTemplate" Widget.

Chris


Ken Sanderson wrote:

>Following up my own question. I found a map file on the web and by 
>looking at what they have done I noticed they had multiple classes, 
>rather then multiple styles like I was trying. So I did a class for 
>each value and an associated Style. It works fine as far as displaying 
>the data, my question now is how do I make it so that the legend 
>doesn't just show the top value for that layer? In short how can I have

>a color for each class listed in the legend under that particular 
>layer?
>
>Thanks again,
>
>Ken
>
>-----Original Message-----
>From: maplab-users-bounces at lists.maptools.org
>[mailto:maplab-users-bounces at lists.maptools.org] On Behalf Of Ken 
>Sanderson
>Sent: June 25, 2004 11:05 AM
>To: maplab-users at lists.maptools.org
>Subject: [maplab-users] How do you display a layer by attribute?
>
>
>Hello all.
>
>How do you set up a map file through map edit to display a layer by an 
>attribute value. So for example if I have a field called TYPE and in 
>that field you can have a value of 1-4. I then want to display all 1's 
>as red, 2's as blue, 3's as green, 4's as yellow on the map.
>
>How do I go about setting that up? I assumed that I would set ClassItem

>to TYPE, but not sure how to go about defining a style object for each 
>value type could be?
>
>Thanks,
>
>Ken
>
>
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-- 
---------------------
Christopher R. Thorne
GIS Product Specialist,
DM Solutions Group Inc.

http://www.dmsolutions.ca
Email: cthorne at dmsolutions.ca
Phone: (613) 565-5056 ext.22
Fax :  (613) 565-0925 


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