By default, zooming in or out zooms using the mouse's location
as an anchor, which makes it possible to navigate the map
using scrolling only, and makes zooming in more intuitive.
This commit adds a new useAnchor option to the MouseWheelZoom
interaction. It is enabled by default, which changes nothing
to the current behavior of the interaction. When disabled,
the interaction stops registering its lastAnchor_ value. This
turns the zoom into a very basic one, that zooms to the center
of the screen.
To use the map center zoom, set the useAnchor option to
false when creating the MouseWheelZoomInteraction, or use its
setMouseAnchor function.
This commit allows setting a z-index property on the layers and uses
it in the canvas, WEBGL and DOM map renderers for ordering the layers
before rendering.
Default z-index is 0 for managed layers and 1000 for unmanaged ones.
It allows always on bottom, always on top and more complex layer layouts.
This commit adds an `extend` method to the draw interaction. This method makes it possible to extend (continue drawing) an existing line string feature. It only works on line string features, where this functionality makes the most sense.
Here's an example on how to use `extend`:
```js
var vectorSource = vectorLayer.getSource();
vectroSource.removeFeature(feature);
drawInteraction.extend(feature);
```
Added the getUrls method to get access to the url / urls property.
When using a tileUrlFunction, getUrls should return null.
This should fix issue #3886
This allows features to be moved around the map. It works much like the Modify interaction, however it's significantly simpler. It uses the geometry's underlying `translate` function.
The previous approach did not work on mobile devices where no `pointermove`
event is sent except from dragging.
Logic now is: Upon vertex creation due to `pointerdown` we will ignore
the next `singleclick` event unless there is a `pointerdrag` event, which will
not lead to a `singleclick` event following the vertex creation.
Resolves#3935
Where workers are not available, or if operations are trivial to run, the main UI thread can be used instead. This also adds tests that run in real browsers.
