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Style your own data

In this Example we create our own custom style to make the data look we want. To keep it simple we'll be styling a line feature to be drawn with a light yellow, with yellow-grey dashed border and the name property shown as text inside the line.

To do this, we define our own style group for the line (called lineStyle in the code). As you can see, it get's build up by the following drawing primitives provided inside the array:

  • 18px wide Yellow line
  • 18px wide Dark Grey dashed line (12px stroke, 10px gap)
  • thinner 10px Light Yellow line
  • text from the GeoJSON at the path properties.name in light grey

Note that the zIndex property for each entry in the array defines the drawing order from bottom to top (ascending values) - not the order in which the array was defined.

To find out more about all the possible styling options, have a look at the documentation for the TileLayer.Style

  // customize the styles that can be used
  style:{
    styleGroups: {
      lineStyle: [
        {zIndex:0, type:"Line", stroke:"#E5B50B", strokeWidth:18, "strokeLinecap": "butt"},
        {zIndex:1, type:"Line", stroke:"#1F1A00", strokeWidth:18, "strokeLinecap": "butt", 'strokeDasharray': [12,10]},
        {zIndex:2, type:"Line", stroke:"#F7FABF", strokeWidth:10},
        {zIndex:3, type:"Text", textRef:"properties.name", fill:"#3D272B"}
      ]
    },
    // decide per feature which style to use
    assign: function(feature, zoomlevel){
      return "linkStyle";
        }

To be as dynamic as possible when it comes to styling there is the assign(feature, zoomlevel) function which you need to implement. This will decide which of the defined styles should be used for a given feature and zoom level.

Keep in mind that this function will be called for each feature that will be rendered, so try to be mindful not to have too time-consuming logic there. It is expected to return a string that is the key to your styleGroup definition to use for the feature.