[Mapserver-users] Changing Colors in Map !!
Satyajit
satyajit.gantayat at aurovision.com
Thu Jul 22 02:13:16 EDT 2004
Thanks Steve....Saw the posting in the list related to my problem. Shall
try using the line with my raster file. Lets hope it gives a better
result. But I still wonder whether I should use a single dummy layer
with multiple classes or a number of dummy layers with one class in each
?
Shall get back to you once I do the modification in my map file.
Thanks again.
~sat
-----Original Message-----
From: mapserver-users-admin at lists.gis.umn.edu
[mailto:mapserver-users-admin at lists.gis.umn.edu] On Behalf Of Stephen
Woodbridge
Sent: Wednesday, July 21, 2004 5:38 PM
To: Satyajit
Cc: 'ANDY CANFIELD'; girish.shewale at aurovision.com;
mapserver-users at lists.gis.umn.edu
Subject: Re: [Mapserver-users] Changing Colors in Map !!
Hi Satyajit,
Since the problem is that you are overflowing the browser lookup table
there is not guarantee that this method will work. When I did this I
have a few colors that were changing so I only used the dummy layers to
protect them.
I also notice that you have a RASTER layer. It is possible that this is
the layer that is using up all the colors. Try adding the following to
any RASTER type LAYER
PROCESSING "COLOR_MATCH_THRESHOLD=3"
http://lists.gis.umn.edu/pipermail/mapserver-dev/2003-February/000177.ht
ml
and see if that helps.
Satyajit wrote:
>
> Hi Steve and Andy,
> I tried Steve's method of adding dummy layers to my map
> file. But I don't see any significant improvement in the "changing
> color" problem. My map still behaves the same. I am using a lot of
> colors in my map. Since I have some 39 layers in my map, there are
> more than 40 unique colors used in the map (outline colors also
> count). Do I have to use these 40 colors in the dummy layers i.e. 40
> dummy layers have to be created ?? I tried using only 10 dummy layers
> with only one class in each of them. Will my problem be solved if I
> use a single dummy layer with 40 classes added in it ? The legend
> problem has been solved. As Steve used HTML legend stuff, I am also
> using a HTML legend stuff. Hence I have control over the legend.
> I can choose which layers to be shown in the legend.
>
> I am attaching my map file with this mail. The part of map file which
> Steve has given in his mail ( which is also in the bug list at this
> place http://mapserver.gis.umn.edu/bugs/show_bug.cgi?id=306) seems to
> be of a different version. When I tried to copy the same to my map
> file it didn't work. I just added a "Style" object in my "Class"
> object with only a color entity in it. Please have a look at the map
> file.
>
> Waiting for your replies.
>
> Regards
> ~sat.
>
> -----Original Message-----
> From: mapserver-users-admin at lists.gis.umn.edu
> [mailto:mapserver-users-admin at lists.gis.umn.edu] On Behalf Of ANDY
> CANFIELD
> Sent: Monday, July 19, 2004 6:50 PM
> To: woodbri at swoodbridge.com; satyajit.gantayat at aurovision.com
> Cc: girish.shewale at aurovision.com; mapserver-users at lists.gis.umn.edu
> Subject: Re: [Mapserver-users] Changing Colors in Map !!
>
>
> Yes, I believe there is a way to do what you want. I have a legend on
> the side of my maps that I generate on the fly by looping through the
> layers of
> the map and adding each layer to the legend as the loop progresses as
> check
> boxes with the layer name so the user can turn off or on the layers.
>
> This allows the legend to be dynamic so no matter what the layers are
> in any map I always get a uniformly formatted legend with no code
> changes.
>
> I have a cosmetic layer much like the layer you are describing that I
> use to copy for placing geocoded points on the map. The users are
> geocoding from
> multiple text files so I want different colored points for each file
so
> they
> can compare the results of the files. That's why I use copies of that
> cosmetic layer so I can use it's symbols and only have to change the
> color.
>
> I don't want the users to have access to these cosmetic layer copies
> that are created on the fly. So I make that the first layer and my
> loop through
> the layers starts at layer 1 rather than layer 0 so the first layer
> never
> shows up in the legend. You could do the same thing with as many
> cosmetic or
> contruction layers as you wanted just be sure to start your loop one
> beyond
> the last "invisible" layer.
>
>
>
>>From: Stephen Woodbridge <woodbri at swoodbridge.com>
>>To: Satyajit <satyajit.gantayat at aurovision.com>
>>CC: Girish <girish.shewale at aurovision.com>, MapServer List
>><mapserver-users at lists.gis.umn.edu>
>>Subject: Re: [Mapserver-users] Changing Colors in Map !!
>>Date: Mon, 19 Jul 2004 08:16:59 -0400
>>
>>You raise a good issue. I don't usually display legends, but have used
>>HTML
>>Legend stuff that allows you a lot of control over your legends and I
>
> think
>
>>you can eliminate layers on a named basis. which might work for you.
>>
>>Please add a comment to the bug referenced below about this problem. I
>>hope
>>that the developers will tackle this problem but it helps to have a
>>complete picture of the problem and issues and their work arounds.
>>
>>-Steve W
>>
>>Satyajit wrote:
>>
>>
>>>Hi Steve,
>>> Thanks a lot for the info. I have not tried your method yet but
>
>
>>>shall try it very soon. And let you know the result. I have a
>>>question
>
>
>>>in my mind though. When we add a dummy layer in our map and add
>>>classes to it ( to preserve the colors ..as you said), the layer will
>>>be shown in the legend in the browser. That dummy layer in the legend
>>>might confuse the end user as that layer's features won't be easily
>>>visible in the map and of course that layer doesn't have much meaning
>>>to it. Is there any way by which I can add that layer in my map file
>>>with all the classes but still make it invisible in the legend ?
>>>Thanks a lot again steve. Shall get back to you after modifying my
map
>
>
>>>file.
>>>
>>>~sat
>>>
>>>Stephen Woodbridge wrote:
>>>
>>>
>>>
>>>>I think I may have created a feature and inserted a one pixel dot on
>>>>the map that gets covers by later layers. Play with it and if you
>>>>have a problem let me know and I can dig through old mapfiles and
>>>>find out
>>>
>>>how
>>>
>>>
>>>>I did it.
>>>
>>>
>>>Here are some examples of preserving the colors in a symbol that were
>>>changing. The big problem with this approach is that it uses up a lot
>
> of
>
>>>layers, so you might try using one layer with lots of classes, but
>>>I'm
>
>
>>>not
>>>sure it that will work.
>>>
>>>The bug for this problem is:
>>> http://mapserver.gis.umn.edu/bugs/show_bug.cgi?id=306
>>>I just updated it with this information.
>>>
>>>## dummy layer to protect symbol colors from changing
>>> LAYER
>>> NAME "color_symbol"
>>> STATUS DEFAULT
>>> TYPE point
>>> TRANSFORM false
>>> FEATURE
>>> POINTS
>>> 1 1
>>> END
>>> END
>>> CLASS
>>> SYMBOL "color_symbol"
>>> COLOR 0 0 0
>>> END
>>> END
>>>## protect other colors
>>> LAYER
>>> NAME blue
>>> STATUS DEFAULT
>>> TYPE point
>>> TRANSFORM false
>>> FEATURE
>>> POINTS
>>> 1 1
>>> END
>>> END
>>> CLASS
>>> COLOR 0 0 255
>>> END
>>> END
>>> LAYER
>>> NAME green
>>> STATUS DEFAULT
>>> TYPE point
>>> TRANSFORM false
>>> FEATURE
>>> POINTS
>>> 1 1
>>> END
>>> END
>>> CLASS
>>> COLOR 8 206 107
>>> END
>>> END
>>>
>>>
>>>
>
> Satyajit wrote :
>
> Dear Users,
> Thanks a million to all the users who gave me their
> valuable suggestions while building site. Without the help of this
> group it would have been impossible for me to build such a nice site (
> I hope you too find it nice). Though my map is smoothly running, I
> have a strange problem in my hands. The data layers in my map are
> changing colors while browsing through them. The change in color
> happens randomly at some zoom levels. At times the colors of the data
> layer match with the colors in the map. You can check out this site
> http://203.199.114.111/newham/ . Normally the data is shown in the
> color specified in the map file. But when I try to zoom in the data
> layers seem to take the colors of different other data layers. And it
> create a whole lot of confusion. I can't really find any reason for
> this. Any ideas ?
>
>
> Sat
> Sr. Specialist - GIS
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