[ka-Map-users] quick question

[Paul Spencer]

Sebastien,

this seems eminently useful, any problem if I look at incorporating  
this into cvs?

Paul

On 4-Nov-05, at 11:17 AM, Sebastian Podjasek wrote:

> Matthew Edmondson:
>
>> I searched the ka-map archives list but didn't find an answer to  
>> the following question: Is it possible to have most of the data  
>> stay cached on the client side but refreshing a individual point  
>> data layer to give to appearance of real time updates, without the  
>> need to have the background GIS data refreshing with it.
>
>
>
> Probably you will not need this, but in my project I needed to  
> update one map layer at every
> tile fetch, so I've made few changes to kaMap.js and init.php to  
> achieve this. Now I can declare
> FORCE_REDRAW in Layer MetaData and ka-map will redraw this layer  
> every time...
> Patches included...
>
> -- 
> Sebastian Podjasek
> morenet.pl
> Index: init.php
> ===================================================================
> RCS file: /cvs/maptools/cvsroot/ka-map/htdocs/init.php,v
> retrieving revision 1.20
> diff -c -r1.20 init.php
> *** init.php	23 Sep 2005 12:29:48 -0000	1.20
> --- init.php	4 Nov 2005 15:57:09 -0000
> ***************
> *** 70,75 ****
> --- 70,81 ----
>                   $aGroups[$oLayer->group] = 0;
>                   $status = ($oLayer->status!=MS_OFF)?'true':'false';
>                   $opacity = $oLayer->getMetaData( 'opacity' );
> +                 $force = $oLayer->getMetaData( 'force_redraw' );
> + 		if( $force == '1' ) {
> + 		    $force = "true";
> + 		} else {
> + 		    $force = "false";
> + 		}
>
>                   /* dynamic imageformat */
>                   $imageformat = $oLayer->getMetaData 
> ( 'imageformat' );
> ***************
> *** 90,96 ****
>
>                   if ($opacity == '')
>                       $opacity = 100;
> !                 $szLayers .= "map.addLayer(new _layer( '".$oLayer- 
> >group."', ".$status.", ".$opacity.", '".$imageformat."',". 
> $szQueryable."));"; //added imageformat parameter
>               }
>           }
>           else if (!isset($aGroups['__base__']))
> --- 96,104 ----
>
>                   if ($opacity == '')
>                       $opacity = 100;
> !                 $szLayers .= "map.addLayer(new _layer( '".$oLayer- 
> >group."', ".$status.", ".$opacity.", '".$imageformat."',". 
> $szQueryable.",".$force."));";
> ! 		// added forced
> ! 		//added imageformat parameter
>               }
>           }
>           else if (!isset($aGroups['__base__']))
> Index: kaMap.js
> ===================================================================
> RCS file: /cvs/maptools/cvsroot/ka-map/htdocs/kaMap.js,v
> retrieving revision 1.53
> diff -c -r1.53 kaMap.js
> *** kaMap.js	17 Oct 2005 16:03:57 -0000	1.53
> --- kaMap.js	4 Nov 2005 15:54:38 -0000
> ***************
> *** 40,45 ****
> --- 40,70 ----
>   var KAMAP_SCALE_CHANGED = gnLastEventId ++;
>   var KAMAP_LAYERS_CHANGED = gnLastEventId ++;
>
> + /*
> +  * log( szMessage )
> +  * for debugging purposes, this function creates a div element on  
> the fly to
> +  * contain the log.
> + */
> + function log(szMessage)
> + {
> +     var d = document.getElementById( 'log' );
> +     if (d == undefined)
> +     {
> +         d = document.createElement( 'div' );
> +         d.id = 'log';
> +         d.setAttribute( 'style', 'zIndex:102;font- 
> family:arial;font-size:10px;position:absolute;top:0px;left: 
> 400px;width:400px;height:100px;overflow:auto;visibility:visible');
> +         document.body.appendChild( d );
> +     }
> +     var p = document.createElement( 'p' );
> +     p.appendChild(document.createTextNode( ((new Date 
> ( )).toLocaleString()) + ": " + szMessage ))
> +     if (d.firstChild)
> +         d.insertBefore( p, d.firstChild );
> +      else
> +         d.appendChild(p);
> +      d.style.scrollTop = 0;
> + }
> +
> +
>
>   / 
> ********************************************************************** 
> ********
>    * kaMap main class
> ***************
> *** 1952,1959 ****
>    *              being capable of being queried.  The layer also  
> has to have
>    *              it's query state turned on using setQueryable
>    *
>     
> ********************************************************************** 
> *******/
> ! function _layer( szName, bVisible, opacity, imageformat,  
> bQueryable )
>   {
>
>       this.name = szName;
> --- 1977,1986 ----
>    *              being capable of being queried.  The layer also  
> has to have
>    *              it's query state turned on using setQueryable
>    *
> +  * bForced
> +  *
>     
> ********************************************************************** 
> *******/
> ! function _layer( szName, bVisible, opacity, imageformat,  
> bQueryable, bForced )
>   {
>
>       this.name = szName;
> ***************
> *** 1964,1969 ****
> --- 1991,1999 ----
>       this.imageformat = imageformat;
>       this.queryable = bQueryable;
>       this.queryState = bQueryable;
> +     this.forced = bForced;
> +
> +     //log( 'New Layer: ' + szName + ', force: ' + bForced );
>   }
>
>   _layer.prototype.isQueryable = function()
> ***************
> *** 2013,2018 ****
> --- 2043,2051 ----
>   		szForce = '&force=true';
>   	var szGroup = "&g="+img.layer.domObj.id;
>   	var szScale = '&s='+this._map.aScales[this._map.currentScale];
> +
> + 	//log('Layer: ' + img.layer.domObj.id);
> +
>   	
>   	// dynamic imageformat
>   	var szImageformat = '';
> ***************
> *** 2022,2027 ****
> --- 2055,2064 ----
>   		image_format = img.layer.imageformat;
>   		szImageformat = '&i='+image_format;
>   	}
> + 	if (img.layer.forced == true) {
> + 	    szForce = '&force=true';
> + 	    //log('layer forced');
> + 	}
>   	
>   	var l = safeParseInt(img.style.left) + this._map.kaMap.xOrigin;
>   	var t = safeParseInt(img.style.top) + this._map.kaMap.yOrigin;
> _______________________________________________
> ka-Map-users mailing list
> ka-Map-users at lists.maptools.org
> http://lists.maptools.org/mailman/listinfo/ka-map-users

+-----------------------------------------------------------------+
|Paul Spencer                           pspencer at dmsolutions.ca   |
+-----------------------------------------------------------------+
|Applications & Software Development                              |
|DM Solutions Group Inc                 http://www.dmsolutions.ca/|
+-----------------------------------------------------------------+