How is the z index used in OpenLayers?

How is the z index used in OpenLayers?

This example uses OpenLayers v 6.6.1. The latest is v 6.6.0 . Example of ordering layers using Z-index. There are are two managed layers (square and triangle) and one unmanaged layer (star). The Z-index determines the rendering order; with {square: 1, triangle: 0, star: unmanaged} indices, the rendering order is triangle, square and star on top.

What are the features of the OpenLayers feature?

OpenLayers features can have a number of style attributes. The ‘default’ style will typically be used if no other style is specified. These styles correspond for the most part, to the styling properties defined by the SVG standard.

How are features defined in openlayers.feature.vector.vector?

OpenLayers. Feature. Vector. Vector features use the OpenLayers.Geometry classes as geometry description. They have an ‘attributes’ property, which is the data object, and a ‘style’ property, the default values of which are defined in the OpenLayers.Feature.Vector.style objects.

How to manipulate layer order in OpenLayers 3?

You can manipulate the layer order via the collection methods. It will probably help to create some helper functions like: Hopefully you have the ability to identify your layers and find them, I set an id on creation like layer.set (“layer_id” 44), which can then be retrieved via layer.get (“layer_id”).

Why are all features given the same z index?

All features are given the same z-index (0), except for the first feature which has a z-index of 1. The layer’s yOrdering parameter is set to the default (false). This configuration makes features succomb to z-index and drawing order (for the features with the same z-index), instead of y-order.

Do you need to change order of layers?

I need to change order of layers throughout using a map. So such possibility as defining z-index like this do not help

How to set the zindex layer order for GeoJSON layers?

Those two methods have no concept of zIndex, so the only thing that works is pushing elements to the top (or bottom) of the SVG group or draw sequence. Also, remind that L.GeoJSON is just a specific type of L.LayerGroup, in your case containing instances of L.Polygon.

Which is an example of the z-index?

Example of ordering layers using Z-index. There are are two managed layers (square and triangle) and one unmanaged layer (star). The Z-index determines the rendering order; with {square: 1, triangle: 0, star: unmanaged} indices, the rendering order is triangle, square and star on top.

What is the z index of a triangle?

Triangle layer Z-index There are are two managed layers (square and triangle) and one unmanaged layer (star). The Z-index determines the rendering order; with {square: 1, triangle: 0, star: unmanaged} indices, the rendering order is triangle, square and star on top.

Where to find list of layers in OpenLayers?

The list of layers is in an object inheriting from an ol.Collection. See the API doc for it. Be careful, I’m pretty sure, you can’t use arbitrary number like 99 in setAt: first arg is for the position in the array of layers and the second arg is for the layer element reference you want to move.

How to add event handler in OpenLayers 3?

And it has some unintuitive caveats caused by openlayers internally moving the selected features to another so called unmanaged layer. Anyhow this works by adding a listener to the collection belonging to the interaction. The collection can be retrieved with .getFeatures ().

Why are features drawn in Z order instead of Y order?

This configuration makes features succomb to z-index and drawing order (for the features with the same z-index), instead of y-order. The features in this map were drawn from left to right and bottom to top, diagonally, to show that y-ordering is not enabled.

How are polygons used in OpenLayers vector layer?

I have an OpenLayers Vector layer which contains polygons and points from PostGIS. I do not want to create a separate table for each entity. I have a StyleMap set for the layer and have zIndexing set to true. My points are using an external graphic and my polygons just a normal style.