[GIS] How to individually label points in Openlayers linestring

labelinglinestringopenlayers

I want to display some text below each point on a linestring with Openlayers. The text would include, for example, the coordinates of the point, plus some other information.

I have managed to add a style to these points, but so far only the same style to all.

https://jsfiddle.net/wainwrightalex/6qbpqmme/8/

I considered creating a new feature for each point, but I would like to avoid this if possible, so I can still use ol.interaction.Modify to edit the linestring.

Is it possible to somehow style these points individually? Or add individual text in some other way?

Best Answer

You can use the geometry config option of ol.style.Style and use a function to create a point at every vertex (http://openlayers.org/en/v3.5.0/apidoc/ol.style.html#GeometryFunction)

See also this blog post for some related information: http://boundlessgeo.com/2015/04/geometry-based-styling-openlayers-3/

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QGIS – Show Labels at Beginning or Ending Points of Linestrings

You can do this with two "Rule-based Labelling" labels, with no filters. This lets you put multiple labels on a feature. The first rule labels the feature with the attribute you want at the start, the second rule with the end attribute. Initially your labels will appear in the centre of the line, so we need to fix that.

Do that with "data defined" expressions for the position. Use the drop-down and hit "Edit...". For the label at the start, use x_at(0) and y_at(0) for the position expressions. For the end label, use x_at(-1) and y_at(-1). End result is:

[GIS] Apply onEachFeature only on Points. Ignore LineStrings

You can check the geometry type of the layer within your onEachFeature function:

function onEachFeature(feature, layer) {
  var layerType = layer.feature.geometry.type;
  if (layerType == 'Point'){
    // add labels, etc
  } else if (layerType == 'Linestring') {
    // display the length, etc
  } else {
    // do something else
  }
}

Best Answer

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