[GIS] How to programatically initiate LineString Draw in OpenLayers 3

openlayers

I am trying to activate draw and place the first point when a action is clicked on a feature. This will then create a single line string to the next point where the marker will move to.

However I am having issues initiating the draw feature start point programatically so that my next click would be the second and final point of the line string.

I have tried implementing using:

 function startmove(coords) {

 interaction = new ol.interaction.Draw({
                        type: 'LineString',
                        createFeature: coords,
                        source: source
                    });
  map.addInteraction(interaction);

 }

Does anyone have any ideas on how to achieve this?

Best Answer

Have a look for ol3 example for creating and editing feature

Related Solutions

[GIS] Using OpenLayers 3 with feature overlay

The feature from the Feature Overlay is always returned. To filter out the filterOverlay just test if the layer parameter is defined. Like this:

var stateFeature = map.forEachFeatureAtPixel(evt.pixel, function (feature, layer) {
  // If layer is undefined, that means it's a feature from a FeatureOverlay
  if (layer) {
    return feature;
  }
}, null, function (layer) {
  return layer === statesLayer;
});

[GIS] Where is the drawn feature when the drawend is triggered in OL3

Try this:

lineStringdraw.on('drawstart', function(){
    vector2.getSource().once('addfeature', handleAddFeature);
});

function handleAddFeature(evt) {
    var feature = evt.feature;
    // ...
}

Add the listener just when start drawing. OL will remove it for you since you are using once.

Best Answer

Related Solutions

[GIS] Using OpenLayers 3 with feature overlay

[GIS] Where is the drawn feature when the drawend is triggered in OL3

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