[mapserver-users] HTML Legend with Status Checking...

Tue Oct 1 13:27:28 PDT 2002

It's all clear now.  Sorry for the misunderstanding.

AFAIK, classes don't have a status you can access in the HTML legend like
layers (unfortunately).  What I know will work (because I do it all the
time) is creating 4 separate layers each with 1 and only 1 class and moving
your MINSCALE and MAXSCALE settings to the layer object.  Give all the
layers the same name (very important).  

This will perform exactly the same since you have no crossover of scale, and
the HTML legend will perform as you expect it to.  

On a separate subject, you might be better off using scaleable symbols
rather than your current solution.  But, perhaps you have reasons for not
using them.

-Dan

 -----Original Message-----
From: Mike Smith [mailto:nospam at cnrit.tamu.edu]
Sent: Tuesday, October 01, 2002 2:43 PM
To: Martin, Daniel
Cc: mapserver-users at lists.gis.umn.edu
Subject: Re: [mapserver-users] HTML Legend with Status Checking...

LAYER
  NAME Parima_Surveyhouseholds
  GROUP Region
  TYPE Point
  STATUS off
  DATA parima_surveyhouseholds
  HEADER 'parima_surveyhouseholds.shp_header.html'
  TEMPLATE parima_surveyhouseholds.shp_query.html

      CLASS
        MINSCALE 20136780
        Name 'Parima Survey Households'
        SYMBOL 'triangle'
        SIZE 5
        COLOR 255 0 0
        OUTLINECOLOR 0 0 0
     END  # CLASS

      CLASS
        MINSCALE 10068390
        MAXSCALE 20136779
        Name 'Parima Survey Households'
        SYMBOL 'triangle'
        SIZE 8
        COLOR 255 0 0
        OUTLINECOLOR 0 0 0
     END  # CLASS

      CLASS
        MINSCALE 5034193
        MAXSCALE 10068389
        Name 'Parima Survey Households'
        SYMBOL 'triangle'
        SIZE 11
        COLOR 255 0 0
        OUTLINECOLOR 0 0 0
     END  # CLASS

      CLASS
        MINSCALE 0
        MAXSCALE 5034192
        Name 'Parima Survey Households'
        SYMBOL 'triangle'
        SIZE 15
        COLOR 255 0 0
        OUTLINECOLOR 0 0 0
     END  # CLASS

END  # LAYER

Martin, Daniel wrote:

Could you provide the map file definition for the Parima Survey Households
layer?

Thanks,
Dan

-----Original Message-----
From: Mike Smith [ mailto:nospam at cnrit.tamu.edu
<mailto:nospam at cnrit.tamu.edu> ]
Sent: Tuesday, October 01, 2002 11:56 AM
To: Martin, Daniel
Cc: mapserver-users at lists.gis.umn.edu
<mailto:mapserver-users at lists.gis.umn.edu> 
Subject: Re: [mapserver-users] HTML Legend with Status Checking...

Same thing.  Now I don't have group header bars seperating my layers, but
all the layers still show up and when I click on a layer that has
scale-specific classes, the symbols for all scales still show up.  By the
way, I'm on Mapserver 3.6.1 and here's the page to go to if you want to see
what I'm talking about:

http://cnrit.tamu.edu/maps/map_init.html
<http://cnrit.tamu.edu/maps/map_init.html>  

Click on the very last button on that page (the one that says "FRAMES
VERSION" on it).  When the map shows up, expand the "Regional" folder on the
left-hand side to display those layers.  The one that I'm working on right
now is called "Parima Survey Households".  Click on that layer to load it
into the map, then you'll see the various symbols I'm referring to show up
in the legend.  I represent the Parima households with red triangle symbols
and I have different sized triangles depending on how far zoomed in you are
so that they are small at a high scale and larger as you zoom in...but I
don't want all versions of that symbol to show up in my legend all the
time...just the one that's in scale.

Thanks again!

Martin, Daniel wrote:

Try this.  Take out the leg_group_html section, and the leg_layer_html
section, leaving only the leg_class_html section.  Take them out entirely -
don't leave an empty set of tags.  Then, let me know what happens.

-Dan

-----Original Message-----
From: Mike Smith [  <mailto:nospam at cnrit.tamu.edu>
mailto:nospam at cnrit.tamu.edu ]
Sent: Tuesday, October 01, 2002 11:33 AM
To: Martin, Daniel
Cc:  <mailto:mapserver-users at lists.gis.umn.edu>
mapserver-users at lists.gis.umn.edu 
Subject: Re: [mapserver-users] HTML Legend with Status Checking...

Gladly.  Here is my legend code:

[leg_group_html]
  <tr>
        <td colspan=3 bgcolor=#cccccc><b>[leg_group_name]</b></td>
  </tr>
[/leg_group_html]

[leg_layer_html]
[/leg_layer_html]

[leg_class_html]
  <tr>
        <td width=15> </td>
        <td>
          <img src="[leg_icon width=15 height=15]" width=15 height=15>
        </td>
        <td>
          [leg_class_name]
        </td>
  </tr>
[/leg_class_html]

However, it does not work as you say (and as the documentation on the web
page says!).  Layers that are "off" do not show up (that's as expected and
what I want), that's fine, but layers that are out of SCALE DO show up, and
that's not as expected and that's not as the documentation states and that's
NOT what I want.  For example, I have a layer called
Ethiopia_Rivers...here's what it looks like:

LAYER
  NAME "Ethiopia_Rivers"
  TYPE LINE
  STATUS off
  GROUP Ethiopia
  DATA "ethiopia_rivers"
  HEADER 'ethiopia_rivers.shp_header.html'
      CLASS
        MAXSCALE 8710165
        Name 'Ethiopia Rivers'
        COLOR 102 204 255
        TEMPLATE ethiopia_rivers.shp_query.html
     END  # CLASS
END  # LAYER

Now, when I'm viewing my map at full extent, my scale factor is 1: 20136789,
therefore if I click on the Ethiopia_Rivers layer at that zoom level,
nothing shows up in the map.  This is the exact behavior that I would
expect...I'm out of scale for that layer, so it doesn't show up in the map
until I zoom in.  The PROBLEM, however, is that the "Ethiopia Rivers" icon
and label pop up in my legend...this is counter-intuitive, contrary to the
documented behavior of Mapserver, and just flat-out frustrating!  If the
layer is not showing up in my map (because it's out of scale), then it
should NOT be in my legend either.  Grrrr!!!  Pardon me for sounding
bitter...I'm not lashing out at you, I'm very grateful for your help, I'm
just frustrated at Mapserver.

Thanks!

Martin, Daniel wrote:

Perhaps I misunderstood.  By default (no opt_flag set) layers that are out
of scale and layers that have a STATUS off will not show in an HTML legend.

A legend exactly like this should do exactly what it sounds like you want:

[leg_class_html]
<TR>
  <TD>
   <img src="[leg_icon]" border=0>
  </TD>
  <TD>	 
    <font face="arial" size=2>[leg_class_name]</font>
  </TD>
</TR>
[/leg_class_html]

I'm not sure why you are having trouble getting the default action.  Perhaps
you could provide your current legend.

-Dan

-----Original Message-----
From: Mike Smith [ mailto:nospam at cnrit.tamu.edu
<mailto:nospam at cnrit.tamu.edu> ]
Sent: Tuesday, October 01, 2002 10:59 AM
To: Martin, Daniel
Cc:  mapserver-user! <mailto:mapserver-users at lists.gis.umn.edu> 

s at li!

sts.gis.u
mn.edu
Subject: Re: [mapserver-users] HTML Legend with Status Checking...

Thank you, but this didn't change a thing.  Actually, let me correct 
that...it had a negative effect because now all my layers show up too, 
even if they are not displayed in the map.  I want only active layers to 
show in the legend and I want only IN-SCALE class symbols to show up in 
the legend, I don't want 4 symbols to show up in the legend for every 
layer that I have which has scale-specific classes...I just don't guess 
I can do that without converting everything over to Mapscript.  X-(

Any other ideas?

Martin, Daniel wrote:

You probably want a bit mask of 2 in your opt_flag.  Layers with STATUS off
still show, but layers out of scale don't show.  

[leg_layer_html opt_flag=2]

Per  http://mapserver.gis.umn.edu/doc36/html-legend-howto.html
<http://mapserver.gis.umn.edu/doc36/html-legend-howto.html>  :

1: If set, show layer even if out of scale (default: hide layers out of
scale). 

2: If set, show layer even if status is OFF (default: hide layers with
STATUS OFF). 

4: If set, show layer even if type is QUERY (default: hide layers of TYPE
QUERY) 

8: If set, show layer even if type is ANNOTATION (default: hide layers of
TYPE ANNOTATION) 

In my experience, opt_flag=2 is the most intuitive.

-Dan

-----Original Message-----
From: Mike Smith [ mailto:nospam at cnrit.! <mailto:nospam at cnrit.tamu.edu> 
tamu!
.ed

u]
Sent: Mo
nday, September 30, 2002 5:06 PM
To:  mapserver-users at lists.gis.umn.edu
<mailto:mapserver-users at lists.gis.umn.edu> 
Subject: [mapserver-users] HTML Legend with Status Checking...

Hello,

   I've seen how you can make legends using PHP Mapscript that check to 
see whether a layer or class is in scale before displaying it in the 
legend, but no mention of how to do this if I'm not using Mapscript.  I 
have sub-classed many of my layers so that symbols show up in different 
sizes depending on how far zoomed in you are.  In other words, I'm using 
"MINSCALE" and "MAXSCALE" in my classes, but all of my classes show up 
in the legend and that's really annoying!  I want ONLY the in-scale 
symbol to show up in the legend as it does in the map...any tips on how 
to do this without Mapscript?  I see the "if" conditional statements in 
the HTML Legend How-to, but!
 there

's no status o
f "SCALE" to 
check with 
those statements... if I could put an if statement in my legend template 
that checked whether or not a class or layer was in scale, then I'd be 
in business...any way to do this?

Thanks!

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/mapserver-users/attachments/20021001/197fbf8b/attachment.htm>