Plot a circle

plotCircle.js

function plotCircle(points, radius, x0, y0) {
    coords = [];
    var slice = 2 * Math.PI / points; //calculate the slice of the pie

    for(var i = 0; i < points; i++) {
        var angle = slice * i;

        var x = x0 + radius * Math.cos(angle);
        var y = y0 + radius * Math.sin(angle);
        coords.push({x: x, y: y});
    }
    return coords;

}