Hi,
I am building a React based web app which tracks some moving objects. For simplicity's sake, let's assume I track cars.
Cars may change position or various states over time, and they may be removed and no longer tracked.
I am managing the tracked objects with a Redux state, simply as an array which contains the Cars data.
I'm having trouble implementing the following behaviour:
1. If a car has been added, add him to the map.
2. If a car has been removed, remove him
3. If a car's location has changed, change it on the map as well.
I've tried using the useEffect() hook with combintation with FeaturesLayer.applyEdits(), but as seen in the image below, I am not sure how to efficiently perform the add and delete operations.
if (props.map.findLayerById(props.id) !== undefined) {
console.log("FeaturesLayer:layer with id : ", props.id, "already exists")
const featLayer = props.map.findLayerById(props.id) as FeatureLayer
// featLayer.source = new Collection(props.source)
featLayer.applyEdits({
updateFeatures: updated_source,
addFeatures: /* How to detect which features do not exist already in the layer
but exist in the new source? */ [],
deleteFeatures: /* How to detect which features do not exist in the new source anymore? */ [],
})
Thank you
