@@ -1701,4 +1701,57 @@ Polyline.prototype.simplify = function(tolerance) { this.points = reduced; }; +/////////////// +// Radius // +/////////////// + +/** + * Creates a new radius object for drawing circles around a point, does a lot of initial calculation to increase load time + * @returns a new Radius + * @type Radius + * @constructor + * @classDescription Radius + * @param {Object} Center LatLonPoint of the radius + * @param {quality} Number of points that comprise the approximated circle (20 is a good starting point) + */ +var Radius = mxn.Radius = function(center, quality) { + this.center = center; + var latConv = center.latConv(); + var lonConv = center.lonConv(); + + // Create Radian conversion constant + var rad = Math.PI / 180; + this.calcs = new Array(); + + for(var i = 0; i < 360; i += quality) + this.calcs.push([Math.cos(i * rad) / latConv, Math.sin(i * rad) / lonConv]); +} + +/** + * Returns polyline of a circle around the point based on new radius + * @param {Radius} radius + * @param {Colour} colour + * @returns {Polyline} Polyline + */ +Radius.prototype.getPolyline = function(radius, colour) { + var points = Array(); + + for(var i = 0; i < this.calcs.length; i++){ + var point = new LatLonPoint( + this.center.lat + (radius * this.calcs[i][0]), + this.center.lon + (radius * this.calcs[i][1]) + ); + points.push(point); + } + + // Add first point + points.push(points[0]); + + var line = new Polyline(points); + line.setColor(colour); + + return line; +}; + + })(); \ No newline at end of file source/mxn.core.js b505e406238554531312a8bb2db67eb950ca4fef Andrew Turner andrew@highearthorbit.com http://github.com/mapstraction/mxn/commit/f4df7bc1520e4c919b48b74761f01ffdcbef2379 f4df7bc1520e4c919b48b74761f01ffdcbef2379 2009-10-03T11:11:56-07:00 2009-10-03T11:11:56-07:00 Added back in the Radius helper class da02f3c411de50b9739e5999dafbc978b42f8e0a Andrew Turner andrew@highearthorbit.com