Function rotate

src/components/drawing/index.js:1851–1855

(t, xy)

var sin = Math.sin;

function rotate(t, xy) {
    var x = xy[0];
    var y = xy[1];
    return [x * cos(t) - y * sin(t), x * sin(t) + y * cos(t)];
}

var previousLon;
var previousLat;