Javascript bounding box calculation

Question

I have latitude / longitude value and distance value. I need to calculate a bounding box with a given location as the center. therefore, if the distance was 200 meters, the rectangle should be 200 meters in front, behind, left, and right.

How do I do this using JavaScript?

Answer 1

You need to translate the lat / long coordinate to the x / y value in the projection of the map you are using, then you can calculate your bounding box.

API Google, , . GBounds, GMercatorProjection GLatLngBounds . API Google , , Proj4js. , , " " . Google Maps .

Answer 2

javascript :

http://www.movable-type.co.uk/scripts/latlong.html

javascript :

LatLon.prototype.boundingBox = function (distance)
{
    return [
        this.destinationPoint(-90, distance)._lon,
        this.destinationPoint(180, distance)._lat,
        this.destinationPoint(90, distance)._lon,
        this.destinationPoint(0, distance)._lat,
    ];
}

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Answer 3

If you use the V3 API , you can use Rectangle and Circle . See a brief description and examples of this blogger:

http://apitricks.blogspot.com/2010/02/rectangle-and-circle-of-v3.html