8.0 Set a No-Go Zone

[tangseng]

Hello, when I was using version 8.0. How Do I Use an API Call to Set a No-Go Zone? How to set up a no-go zone if it is a point? If it’s a region, how do I set it up? If the center of the circle is a circle, how to set it？
GHRequest req = new GHRequest(39.668969,116.068905, 39.757418,116.157294).
setProfile(“car”).
setAlgorithm(Parameters.Algorithms.ALT_ROUTE).
setLocale(Locale.CHINA);
//How to set up a no-go zone???
req.?( No-Go Zone)
Please, thank you

[karussell]

You can use an area and block this in the custom model: https://github.com/graphhopper/graphhopper/blob/master/docs/core/custom-models.md#areas

A circle is not possible but you can use a polygon and instead of limiting the speed you would use

{
  "priority" : [{ "if": "in_area1", "multiply_by": "0"  }]
}

[tangseng]

Sorry, I didn’t make it clear
I want to set an area that cannot be passed through. This area is a circular area. How do I set this area?
I make the call through Java calls

[karussell]

A circular area is not possible but you can use a polygon that comes close using GHUtility.createCircle

I want to set an area that cannot be passed through.

Yes, see the linked Java example and replace “speed” with “priority” etc. like this:

customModel.addToPriority(If("in_area1", MULTIPLY, "0"));

[tangseng]

Hello, thank you very much for your answer.
However, I also want to ask you, if it is a waypoint, then how do you design it? Or how to set up the route area?

[tangseng]

sorry ,According to what you said, it can be set without any errors, but the planned route will still pass through the restricted area