Question

I have a lat/long coordinate point and I’m drawing a polygon (hexagon) around it on a Google map. Here’s my code to calculate the hexagon coordinates:

for (var i = 0; i < 6; i++) {
    x =  lat + r * Math.sin(i * 2 * Math.PI / 6);
    y =  lng + r * Math.cos(i * 2 * Math.PI / 6);
}

This calculates all coordinates in a regular hexagon and I can draw it on the map without a problem if its center is near (0 lat, 0 long). The problem is when I want to draw it far from (0, 0) this gets into an elongated shape. I’m guessing it’s because the earth is not flat and Google maps takes that into account. So I probably need to change the radius in my calculation to reflect this, has anyone any idea how it is done?

Answer 1

Examples of various regular polygons far from (0,0)