// This file adds a new circle overlay to GMaps2
// it is really a many-pointed polygon, but look smooth enough to be a circle.
var CircleOverlay = function(latLng, radius, strokeColor, strokeWidth, strokeOpacity, fillColor, fillOpacity) {
	this.latLng = latLng;
	this.radius = radius;
	this.strokeColor = strokeColor;
	this.strokeWidth = strokeWidth;
	this.strokeOpacity = strokeOpacity;
	this.fillColor = fillColor;
	this.fillOpacity = fillOpacity;
}

// Implements GOverlay interface
CircleOverlay.prototype = GOverlay;

CircleOverlay.prototype.initialize = function(map) {
	this.map = map;
}

CircleOverlay.prototype.clear = function() {
	if(this.polygon != null && this.map != null) {
		this.map.removeOverlay(this.polygon);
	}
}

// Calculate all the points and draw them
CircleOverlay.prototype.redraw = function (force) {
    var d2r = Math.PI / 180;
    circleLatLngs = new Array();
    var circleLat = this.radius * 0.014483;  // Convert statute miles into degrees latitude
    var circleLng = circleLat / Math.cos(this.latLng.lat() * d2r);
    var numPoints = 40;

    ///
    var maxLat = -90;
    var maxLong = -180;
    var minLat = 90;
    var minLong = 180;
    ///

    // 2PI = 360 degrees, +1 so that the end points meet
    for (var i = 0; i < numPoints + 1; i++) {
        var theta = Math.PI * (i / (numPoints / 2));
        var vertexLat = this.latLng.lat() + (circleLat * Math.sin(theta));
        var vertexLng = this.latLng.lng() + (circleLng * Math.cos(theta));
        if (maxLat < vertexLat) {
            maxLat = vertexLat;
        }
        if (minLat > vertexLat) {
            minLat = vertexLat;
        }
        if (maxLong < vertexLng) {
            maxLong = vertexLng;
        }
        if (minLong > vertexLng) {
            minLong = vertexLng;
        }
        var vertextLatLng = new GLatLng(vertexLat, vertexLng);
        circleLatLngs.push(vertextLatLng);
    }

    var sw = new GLatLng(minLat, minLong);
    var ne = new GLatLng(maxLat, maxLong);
    var bounds = new GLatLngBounds(sw, ne);   


    this.clear();
    this.polygon = new GPolygon(circleLatLngs, this.strokeColor, this.strokeWidth, this.strokeOpacity, this.fillColor, this.fillOpacity);
    map.addOverlay(this.polygon);
    map.setCenter(bounds.getCenter(), map.getBoundsZoomLevel(bounds));  
}

CircleOverlay.prototype.remove = function() {
	this.clear();
}

CircleOverlay.prototype.containsLatLng = function(latLng) {
	// Polygon Point in poly 
	if(this.polygon.containsLatLng) {
		return this.polygon.containsLatLng(latLng);
	}
}

CircleOverlay.prototype.setRadius = function(radius) {
	this.radius = radius;
}

CircleOverlay.prototype.setLatLng = function(latLng) {
	this.latLng = latLng;
}