Identify marker's location inside a circular overlay on Google Maps using Javascript API V3

On my map, there are markers scattered around and a radius (circle overlay) on a marker indicating your location. Is there a way to check if any of the other markers fall within this circle?

UPDATE

I tackled this issue by iterating through each marker, utilizing the geometry library to calculate the distance between your marker and the others. I then used a simple if statement to determine if it's less than 100 meters.

function checkAllChests() {
    var Current = 0;
    $.each(treasureArray, function() {
        //var thisLocation = treasureArray[Current].getPosition();

        var distanceBetween = Math.ceil(google.maps.geometry.spherical.computeDistanceBetween(treasureArray[Current].getPosition(), marker_me.getPosition()));
        if(distanceBetween < 100) {
            alert('CAN OPEN THIS CHEST');
        }
        Current++;
    });
}

Note that the code above relies on jQuery, so it won't work without jQuery.

Answer №1

Learn how to enhance the google.maps.Circle class by implementing a custom contains method. This method leverages the bounding box to efficiently check if a point is located within the circle. It first evaluates if the point falls inside the bounding box and then compares the distance between the point and the center with the radius to determine containment.

Once you integrate the provided javascript snippet, you'll be able to easily utilize the contains() method on your circle object.

google.maps.Circle.prototype.contains = function(latLng) {
  return this.getBounds().contains(latLng) && google.maps.geometry.spherical.computeDistanceBetween(this.getCenter(), latLng) <= this.getRadius();
}

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