[OpenLayers-Users] Different Styles Within Vector Layer

[Jürgen Dankoweit]

Hello Diego,

Am 17.05.2013 10:40, schrieb Diego M.:
> Is there any way to configure OpenLayers styling method? I have a vector
> layer and I would like to style the features depending on a value of a flag
> variables, so I can't use rules. Lets say I have two types of features:
> houses and restaurants. houses flag is "H" and restaurants flag is "R". How
> can I give them a different style within a vector layer?

Yes you can :)

Look at my code snippet:
var styleMap_Wetter = new OpenLayers.StyleMap({
 'default':{
  fontColor: "\${fcolor}",
  fontSize: "12pt",
  fontFamily: "serif",
  fontWeight: "bolder",
  labelOutlineWidth: 6,
  labelOutlineColor: "#F8F8F8",
  labelAlign: "rm",
  externalGraphic: "\${icon}",
  graphicWidth: 32px,
  graphicXOffset : 0,
  graphicYOffset : 0,
  graphicOpacity: 1,
  label: "\${text}"
}});

All these "\${...}" are placeholder for attributes. They are assigned
like the following example:

point = new OpenLayers.Geometry.Point(lonLat.lon, lonLat.lat);
var pf = new OpenLayers.Feature.Vector(point);
pf.attributes = {text: stadt, fcolor: text_color, ...};

For your application that means that you do the following:

point = new OpenLayers.Geometry.Point(lonLat.lon, lonLat.lat);
var pf = new OpenLayers.Feature.Vector(point);
switch building: {
 case "H"
  pf.attributes =
   {text: "House", fcolor: "#ff0000", icon: "house.png"};
  break;
 case "R":
  pf.attributes =
   {text: "Restaurant", fcolor: "#00ff00", icon: "restaurant.png"};
  break;
 default:
  break;
}

Based on this code snippet I build an weather card which shows for every
stored station the current weather conditions:
http://www.dankoweit.de/cgi-bin/metar_karte.pl?geo=1&typ=metar

I hope this helps


Best regards

Juergen
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