Contents
Can you draw a circle with radius in OpenLayers?
NB. The OpenLayers circle created here is always a perfectly flat 2d circle. Whereas in reality you may want something that takes better account of the map projection (especially close to the poles). Thanks for contributing an answer to Stack Overflow!
Is the circle geometry supported by WKT format?
The circle geometry (a center with a radius) is not a supported by the WKT format. Thanks for contributing an answer to Geographic Information Systems Stack Exchange! Please be sure to answer the question. Provide details and share your research!
Which is the latest version of OpenLayers for Windows?
This example uses OpenLayers v 6.6.1. The latest is v 6.6.0 . Example of using the ol/interaction/Draw interaction together with the ol/interaction/Modify interaction.
How to add feature to OpenLayers vector source?
Adding a feature to Openlayers Vector source 1 get the features from a vector source and 2 for some features, use their coordinates to construct new features, e.g. ol.geom.Circle buffers. More
How to retrieve the source features in OpenLayers?
For 1, to retrieve the source features, if I understand correctly you need to monitor the change event like this: If it is ‘ready’ you have asynchronously retrieved the source, correct?
How to add features outside of foreach in OpenLayers?
This creates a huge stack size, so something is clearly going wrong. Try to add features outside of forEach. Because features of the source are increasing every loop in your code. Try to code like this:
How to use OpenLayers 3 feature onClick event?
Once you click, it takes the pixel clicked and iterate through all the layers to find any feature within a range of that pixel coordinate. It’s not going through all the pixels of the map. Look at the code to better understand this.
How do you find the radius of a map?
The following code will give you a circle in light blue centered at the center of the current map with a radius defined in meters. If you want it in feet, just replace:
How to calculate the center of geometry in OpenLayers?
This will be easy in certain types of coordinate systems (EPSG:3857, which is meter based), but more difficult in others (EPSG:4326, based on lon/lat coords). A function which could calculate this center (in EPSG:3857) would be as following;
How to get the center of a feature?
You can get its extent center using ol.extent.getCenter. In my case I have a vector layer and I want to get the center of a feature after I click it. For each click…
Can you draw a circle on a vector layer?
I have been trying this for a while but I cannot manage to draw a circle on a vector layer although my polygons are being created without any problems.
How to draw a circle in Ol interaction?
My problem seems simple but I cannot find any questions that successfully solve it. I want to draw a circle using ol.interaction.Draw, and access the feature that is created immediately.