suggestions: add hooks and/or circles/discs display

I had a request to add circular zones to maps.
To fullfill this request, I had to modify osm.php and osm-openlayers.php, to add parameters and subroutines. I think it would be nice to have hooks which permit to add fonctionnalities.

modifications I have done
in osm.php
attributes of shortcodes

,
  /// discs
    /// discs parameters
    'disc_center_list'         => '',          // in decimal degrees
    'disc_radius_list'         => '',          // in meters
    'disc_center_opacity_list' => '0.5',       // float 0->1
    'disc_center_color_list'   => 'red',       // html name or #rvb or #rrvvbb
    'disc_border_width_list'   => '3',         // integer
    'disc_border_color_list'   => 'blue',      // html name or #rvb or #rrvvbb
    'disc_border_opacity_list'  => '0.5',      // float 0->1
    'disc_fill_color_list'      => 'lightblue',// html name or #rvb or #rrvvbb
    'disc_fill_opacity_list'    => '0.5'       // float 0->1
  /// end discs

modifying $output for discs:

/// add the disc(s)

    /// discs parameters
    ///'disc_center_list'         => '',
    ///'disc_radius_list'         => '',
    ///'disc_center_opacity_list' => '0.5',
    ///'disc_center_color_list'   => 'red',
    ///'disc_border_width_list'   => '3',
    ///'disc_border_color_list'   => 'blue',
    ///'disc_border_opacity_list'  => '0.5',
    ///'disc_fill_color_list'      => 'lightblue',
    ///'disc_fill_opacity_list'    => '0.5'
    /// end discs

    if ($disc_center_list != ''){
      $centerListArray        = explode( ',', $disc_center_list );
      $radiusListArray        = explode( ',', $disc_radius_list );
      $centerOpacityListArray = explode( ',', $disc_center_opacity_list);
      $centerColorListArray   = explode( ',', $disc_center_color_list );
      $borderWidthListArray   = explode( ',', $disc_border_width_list );
      $borderColorListArray   = explode( ',', $disc_border_color_list );
      $borderOpacityListArray = explode( ',', $disc_border_opacity_list);
      $fillColorListArray     = explode( ',', $disc_fill_color_list );
      $fillOpacityListArray   = explode( ',', $disc_fill_opacity_list);
      $this->traceText(DEBUG_INFO, "(NumOfdiscs: ".sizeof($centerListArray)." NumOfradius: ".sizeof($radiusListArray).")!");

      if (sizeof($centerListArray) == sizeof($radiusListArray) && !empty($centerListArray) && !empty($radiusListArray)   ) {
        $output .= Osm_OpenLayers::addDiscs($centerListArray,$radiusListArray,$centerOpacityListArray,$centerColorListArray,
                                $borderWidthListArray,$borderColorListArray,$borderOpacityListArray,$fillColorListArray,$fillOpacityListArray);
      } else {
        $this->traceText(DEBUG_ERROR, "Discs parameters error");
      }
    }

    /// end discs

osm-openlayers.php

/// discs
   function addDiscs($centerListArray,$radiusListArray,$centerOpacityListArray,$centerColorListArray,
                     $borderWidthListArray,$borderColorListArray,$borderOpacityListArray,$fillColorListArray,$fillOpacityListArray) {

   $layer='
   var discLayer = new OpenLayers.Layer.Vector("Disc Layer");';

   $layer.='
   addDisc = function (lon, lat, radius, centeropac, centercol, strw, strcol, stropac, fillcol, fillopac) {
   var lonLat = new OpenLayers.LonLat(lon, lat).transform(new OpenLayers.Projection("EPSG:4326"), map.getProjectionObject());

    var discStyle    = { strokeColor: strcol,
                         strokeOpacity: stropac,
                         strokeWidth: strw,
                         fillColor: fillcol,
                         fillOpacity: fillopac
                       };
    var centerStyle  = { strokeColor: centercol,
                         strokeOpacity: centeropac,
                         strokeWidth: strw,
                         fillColor: centercol,
                         fillOpacity: centeropac
                       };

    var disc = OpenLayers.Geometry.Polygon.createRegularPolygon(
                                             new OpenLayers.Geometry.Point(lonLat.lon, lonLat.lat),
                                             radius,
                                             200 // nombre de faces
                 );
    var center = OpenLayers.Geometry.Polygon.createRegularPolygon(
                                             new OpenLayers.Geometry.Point(lonLat.lon, lonLat.lat),
                                             1, // taille dans lunite de la carte
                                             5  // nombre de faces
                 );

    var featureDisc   = new OpenLayers.Feature.Vector(disc,null,discStyle);
    var featureCenter = new OpenLayers.Feature.Vector(center,null,centerStyle);
    discLayer.addFeatures([featureDisc,featureCenter]);
   };
   ';

   for($i=0;$i<sizeof($centerListArray);$i++){
    // $centerListArray[$i] = lon lat -> lon,lat
    // only center and radius must be defined for each disc to be shown, else use first/default value (ie [0])
    $layer .= 'addDisc('.implode(",",explode( " ", trim($centerListArray[$i]) )).', '.$radiusListArray[$i].', '.
                      ((isset($centerOpacityListArray[$i]))? $centerOpacityListArray[$i] : $centerOpacityListArray[0]).', "'.
                      ((isset($centerColorListArray[$i]))?   $centerColorListArray[$i]   : $centerColorListArray[0]).'", '.
                      ((isset($borderWidthListArray[$i]))?   $borderWidthListArray[$i]   : $borderWidthListArray[0]).', "'.
                      ((isset($borderColorListArray[$i]))?   $borderColorListArray[$i]   : $borderColorListArray[0]).'", '.
                      ((isset($borderOpacityListArray[$i]))? $borderOpacityListArray[$i] : $borderOpacityListArray[0]).', "'.
                      ((isset($fillColorListArray[$i]))?     $fillColorListArray[$i]     : $fillColorListArray[0]).'", '.
                      ((isset($fillOpacityListArray[$i]))?   $fillOpacityListArray[$i]   : $fillOpacityListArray[0]).');
   ';

   }
   $layer.='
    map.addLayer(discLayer);';

    //$Layer='';
    return $layer;
   }

   /// end discs

hope that can help
alain

http://wordpress.org/extend/plugins/osm/