/**
 * @file
 * GPolyLine / GPolygon manager
 */

/*global Drupal, GLatLng, GPoint */

Drupal.gmap.map.prototype.poly = {};

/**
 * Distance in pixels between 2 points.
 */
Drupal.gmap.map.prototype.poly.distance = function (point1, point2) {
    return Math.sqrt(Math.pow(point2.x - point1.x, 2) + Math.pow(point2.y - point1.y, 2));
};

/**
 * Circle -- Following projection.
 */
Drupal.gmap.map.prototype.poly.computeCircle = function (obj, center, point2) {
    var numSides = 36;
    var sideInc = 10; // 360 / 20 = 18 degrees
    var convFactor = Math.PI / 180;
    var points = [];
    var radius = obj.poly.distance(center, point2);
    // 36 sided poly ~= circle
    for (var i = 0; i <= numSides; i++) {
        var rad = i * sideInc * convFactor;
        var x = center.x + radius * Math.cos(rad);
        var y = center.y + radius * Math.sin(rad);
        //points.push(obj.map.getCurrentMapType().getProjection().fromPixelToLatLng(new GPoint(x,y),obj.map.getZoom()));
        points.push(new GPoint(x, y));
    }
    return points;
};

Drupal.gmap.map.prototype.poly.calcPolyPoints = function (center, radM, numPoints, sAngle) {
    if (!numPoints) {
        numPoints = 32;
    }
    if (!sAngle) {
        sAngle = 0;
    }

    var d2r = Math.PI / 180.0;
    var r2d = 180.0 / Math.PI;
    var angleRad = sAngle * d2r;
    // earth semi major axis is about 6378137 m
    var latScale = radM / 6378137 * r2d;
    var lngScale = latScale / Math.cos(center.latRadians());

    var angInc = 2 * Math.PI / numPoints;
    var points = [];
    for (var i = 0; i < numPoints; i++) {
        var lat = parseFloat(center.lat()) + latScale * Math.sin(angleRad);
        var lng = parseFloat(center.lng()) + lngScale * Math.cos(angleRad);
        points.push(new GLatLng(lat, lng));
        angleRad += angInc;
    }

    // close the shape and return it
    points.push(points[0]);
    return points;
};