User:Tut Bastet

// 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;

// 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)); var vertextLatLng = new GLatLng(vertexLat, vertexLng); circleLatLngs.push(vertextLatLng); }

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

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; }

circle = new CircleOverlay(map.getCenter(), circleRadius, "#336699", 1, 1, '#336699', 0.25); map.addOverlay(circle);