Re: [OpenLayers-Users] Call Mapfile layer with Openlayers whenstatus ON or OFF

[Arnd Wippermann]

Hi Paul,
 
by default OpenLayers use EPSG:4326 for the map, if not otherwise declared.
The extent for the whole world are -180,-90,180,90 with a resolution of
1.40. From your extent it seems, you want an other projection. So you have
to declare the projection in the map options.
 
Arnd 
 
  _____  

Von: users-boun...@openlayers.org [mailto:users-boun...@openlayers.org] Im
Auftrag von Paul Curran
Gesendet: Mittwoch, 9. September 2009 22:20
An: Alexandre Dube
Cc: users@openlayers.org
Betreff: Re: [OpenLayers-Users] Call Mapfile layer with Openlayers
whenstatus ON or OFF


Thanks for your responses
 
I have now removed the map parameter as suggested. I am just trying to
display one layer correctly and i will then add my second layer when my
single layer looks right. 
 
My layer is now displaying tiled across the screen several times and quite
zoomed out, i cannot zoom in or out
 
My code now looks as follows:
 
      var bounds = new OpenLayers.Bounds(0, 0, 660046, 1229782);
      var map, layer1, layer2;
      var options = { maxExtent: bounds, maxResolution: 600, numZoomLevels:
10};
      
      
      function init(){
          map = new OpenLayers.Map('map', options);
      layer1 = new OpenLayers.Layer.WMS("OpenLayers WMS",
      "http://localhost/cgi-bin/mapserv.exe?mode=map
<http://localhost/cgi-bin/mapserv.exe?mode=map&map=c:/ms4w/apps/openlayers-2
.5/data/uk2.map> &map=c:/ms4w/apps/openlayers-2.5/data/uk2.map", { layers:
"250" },
      { gutter: 15, minZoomLevel: 1, maxZoomLevel: 4 });
      map.addLayer(layer1);
      
      map.zoomToExtent(bounds);
      map.setCenter(bounds);
      map.zoomToMaxExtent();
      map.addControl(new OpenLayers.Control.PanZoomBar());
      map.addControl(new OpenLayers.Control.MousePosition());
      }
 
Any more much much appreciatted
 
Cheers


2009/9/9 Alexandre Dube <ad...@mapgears.com>


Hi Paul,

You can copy the image url by right clicking on it and open it in a new
window. You'll see the request url constructed by OpenLayers and maybe an
error message from MapServer.

I noticed that you use the "map" parameter. WMS has no such parameter so it
should be part of your main url, like below. Also, if you look in the
OpenLayers/Layer/WMS.js code, you'll see that this object takes 4
parameters, the 3e being the server-side "parameters" and the 4th being the
OpenLayers object "options". min/maxZoomLevel are not parameters but OL
options. 


layer1 = new OpenLayers.Layer.WMS(
"OpenLayers WMS",


"http://127.0.0.1/cgi-bin/mapserv.exe?map=/ms4w/apps/openlayers-2.5/data/uk2
.map
<http://127.0.0.1/cgi-bin/mapserv.exe?map=/ms4w/apps/openlayers-2.5/data/uk2
.map&> &",
{ layers: "uk"},

{ gutter: 15, minZoomLevel: 1, maxZoomLevel: 4 }
);


If you still get pink tiles, copy the link in a new window to see the error.

Regards,

Alexandre

Paul Curran wrote:



Hi

I can view my UK Layer via Mapserver with the following url:
'ms4w/cgi-bin/mapserv.exe?mode=map&map=c:mapdirectory*&layer=uk'.* The
*&layer=uk *is calling my layer.

However I can’t find any documentation on how to call the layer when viewing
my map within OpenLayers.

I am currently trying to call the layer like this:

var map, layer1, layer2;

var options = { maxExtent: bounds, maxResolution: 600, numZoomLevels: 10};

layer1 = new OpenLayers.Layer.WMS("OpenLayers WMS",

"http://127.0.0.1/cgi-bin/mapserv.exe?";, { layers: "uk", map:
'/ms4w/apps/openlayers-2.5/data/uk2.map',

minZoomLevel: 1, maxZoomLevel: 4 },

{ gutter: 15 });

layer2 = new OpenLayers.Layer.WMS("OpenLayers WMS",

"http://127.0.0.1/cgi-bin/mapserv.exe?";, { layers: "250", map:
'/ms4w/apps/openlayers-2.5/data/uk2.map',

minZoomLevel: 5, maxZoomLevel: 10},

{ gutter: 15 });

map.addLayer(uk, 250);

map.zoomToExtent(bounds);

map.setCenter(bounds);

map.zoomToMaxExtent();

However I am just seeing pink tiles within OpenLayers.

Note: If my layers are set to default within my Mapfile all my layers are
displayed.

Thanks for any help in advance

Paul


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-- 
Alexandre Dubé
Mapgears
www.mapgears.com <http://www.mapgears.com/> 





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