Conv.as

package
{
	import flash.display.*;
	import flash.text.*;
	import flash.events.*;

	public class Conv extends Sprite
	{
		private var mText:TextField;
		function Conv()
		{
			mText = new TextField();
			mText.width = 800;
			mText.height = 600;

			addChild(mText);
			mText.type = TextFieldType.INPUT;
			mText.background = true;
			mText.backgroundColor = 0xffffff;
			mText.multiline = true;

			var btn:StartButton = new StartButton();
			addChild(btn);
			btn.y = 580;
			btn.buttonMode = true;
			btn.addEventListener(MouseEvent.CLICK, onClick);

//			tx.height = 500;
//			removeChild(tx);
//			addChild(tx);
//			tx.y = 340;
//			tx.width = 400;
		}

		private function onClick(e:MouseEvent):void
		{
			var s:SVGConverter = new SVGConverter(mText.text);
			var canvas:Sprite = new Sprite();
			addChild(canvas);
			canvas.y = 220;

			var gen:KMLGenerator = new KMLGenerator()
			s.renderShapes(gen);
			mText.text = gen.dump();
		}

	}
}

class SVGConverter
{
	import flash.geom.*;
	import flash.display.*;

	private var X:XML;
	private var mShapes:Array = [];
	private var mCurPt:Point;
	function SVGConverter(src:String)
	{
		X = new XML(src);
		var list:XMLList = X.children();
		for each(var ch:XML in list) {
			if (ch.localName() == "path") 
				addPath(ch);
		}
	}

	public function renderShapes(g:IGraphics):void
	{
		for each(var sh:SVGShape in mShapes) {
			renderAShape(sh, g);
		}
	}

	private function renderAShape(sh:SVGShape, g:IGraphics):void
	{
		g.beginFill(sh.fill);
	//		g.lineStyle(0, 0xffffff);
		for each(var seg:Segment in sh.segments) {
			drawSegment(seg, g);
		}
		g.endFill();
	}

	public static function nearZero(v:Number):Boolean
	{
		return (v < 0.1) && (v > -0.1);
	}

	private function drawSegment(s:Segment, g:IGraphics):void
	{
		var len:int = s.points.length;
		var pt2:Point;
		var pt3:Point;

		for (var i:int = 0;i < len;i++) {
			var pt:Point = s.points[i] as Point;
			if (i == 0) {
				if (mCurPt && nearZero(mCurPt.x - pt.x) && nearZero(mCurPt.y - pt.y)) {
					
				} else {
					g.moveTo(pt.x, pt.y);
					mCurPt = pt;
				}
				continue;
			} 

			if (s.curved)
			{
				pt2 = s.points[++i] as Point;
				pt3 = s.points[++i] as Point;
				b3(g, mCurPt.x, mCurPt.y, pt.x, pt.y, pt2.x, pt2.y, pt3.x, pt3.y, 3);
				mCurPt = pt3;
			} else {
				mCurPt = pt;
				g.lineTo(pt.x, pt.y);
			}
		}
	}

	private function b3(g:IGraphics, x0:Number,y0:Number,x1:Number,y1:Number,x2:Number,y2:Number,x3:Number,y3:Number,divs:uint = 100):void
	{
	    var up:Number = 1.0 / (divs + 1);
	    var tm:Number;
	    for (var t:Number = 0; t < 1;t += up) {
	        tm = 1 - t;
	        g.lineTo(
	            x0 * Math.pow(tm, 3) + 3 * x1 * t *Math.pow(tm, 2) + 3 * x2 * Math.pow(t, 2) * tm + x3 * Math.pow(t, 3),
	            y0 * Math.pow(tm, 3) + 3 * y1 * t *Math.pow(tm, 2) + 3 * y2 * Math.pow(t, 2) * tm + y3 * Math.pow(t, 3)
	        );
	
	    }
	    g.lineTo(x3, y3);
	}


	private function addPath(x:XML):void
	{
		var d:String = x.@d[0];
		var records:Array = d.split(/ +/);

		var op:String = null;
		var index:int = 0;
		var pt:Point = new Point();
		var sh:SVGShape = new SVGShape();
		var seg:Segment;

		for each(var r:String in records) {
			var n:Number;
			if (r == '') continue;

			if (/[a-zA-Z]/.test(r))
				n = NaN;
			else
				n = parseFloat(r);

			if (isNaN(n)) {
				if (seg && (r == 'M' || r == 'Z' || (seg.points.length > 1 &&  ((r == 'L' && seg.curved) || (r == 'C' && !seg.curved))) )) {
					sh.addSegment(seg);
					seg = null;
				}

				if (!seg)
					seg = new Segment();
				if (r == 'C')
					seg.curved = true;

				if ((r == 'C' || r == 'L') && seg.points.length == 0)
					seg.addPoint(pt);

				op = r;
				index = 0;
				continue;
			} else {
				if ((index%2) == 0) {
					pt.x = n;
				}
				else {
					pt.y = n;
					seg.addPoint(pt);
				}
			}

			index++;
		}

		mShapes.push(sh);
		sh.fill = parseInt(x.@fill[0].substring(1), 16);
//		STDOUT.puts(x.@d[0]);
	}
}

class SVGShape
{
	public var segments:Array = [];
	public var fill:uint;
	public function addSegment(s:Segment):void
	{
		segments.push(s);
	}
}

class Segment
{
	import flash.geom.*;
	public var curved:Boolean = false;
	public var points:Array = [];

	public function addPoint(pt:Point):void
	{
		var pt2:Point = new Point(pt.x, pt.y);
		points.push(pt2);
	}
}

class StartButton extends flash.display.Sprite
{
	import flash.display.*;
	import flash.geom.*;

	public static const G_COLORS:Array = [0xaaaaaa, 0x555555];
	public static const G_ALPHAS:Array = [1, 1];
	public static const G_RATIOS:Array = [0, 255];
	private var mGradTrans:Matrix;

	function StartButton()
	{
		mGradTrans = new Matrix();
		mGradTrans.createGradientBox(30, 30, Math.PI/2);		

		var g:Graphics = graphics;
		g.beginGradientFill(GradientType.LINEAR, G_COLORS, G_ALPHAS, G_RATIOS, mGradTrans);
		g.drawRect(0, 0, 40, 20);
		g.endFill();
	}
}

class KMLGenerator implements IGraphics
{
	import flash.utils.*;

	private var polygons:Array = [];
	private var coords:Array = [];
	private var fills:Dictionary = new Dictionary();
	private var mScale:Number = 0.0007;
	private var mNextStyleId:int = 1;
	private var mCurStyleId:int;

	public function dump():String
	{
		var poly_elems:Array = [];
		var len:int = polygons.length;
		poly_elems.push('<?xml version="1.0" encoding="UTF-8"?>\n<kml xmlns="http://www.opengis.net/kml/2.2">\n<Document>');

		for (var clr:String in fills) {
			var bgr:uint = parseInt(clr);
			bgr = (bgr&0x00ff00) | ((bgr&0xff0000)>>16) | ((bgr&0xff)<<16);
			var hex:String = ("000000" + bgr.toString(16));
			hex = hex.substring(hex.length - 6);
			poly_elems.push( "<Style id=\"f"+fills[clr]+"\"><PolyStyle><color>ff"+hex+"</color><colorMode>normal</colorMode><outline>0</outline></PolyStyle></Style>" );
		}

		for (var i:int = 0;i < len;i++) {
			for each(var ll:LatLng in polygons[i].coords)
				ll.alt = i*100;
			poly_elems.push("<Placemark><styleUrl>#f"+polygons[i].sid+"</styleUrl><Polygon><outerBoundaryIs><LinearRing><coordinates>"+polygons[i].coords.join(' ')+"</coordinates></LinearRing></outerBoundaryIs></Polygon></Placemark>");		
		}

		poly_elems.push('</Document></kml>');

		return poly_elems.join("\n");
	}

	public function beginFill(c:uint):void
	{
		if (fills[c]) {
			mCurStyleId = fills[c] as int;
		} else {
			fills[c] = mNextStyleId++;
			mCurStyleId = fills[c];
		}

		coords = [];
	}

	public function endFill():void
	{
		if (coords.length > 0) {
			polygons.push({sid: mCurStyleId, coords: coords});
			coords = [];
		}
	}

	public function moveTo(x:Number, y:Number):void
	{
		endFill();
		

		var ll:LatLng = new LatLng();
		XYtoLatLng(x * mScale, y * mScale + 0.2, ll);

		coords.push(ll);
	}

	public function lineTo(x:Number, y:Number):void
	{
		var ll:LatLng = new LatLng();
		XYtoLatLng(x * mScale, y * mScale + 0.2, ll);

		coords.push(ll);
	}

	public static function XYtoLatLng(x:Number, y:Number, out:LatLng):Boolean
	{
		const PI:Number = Math.PI;
		const DPI:Number = PI * 2.0;
		const HPI:Number = PI / 2.0;

		var lng:Number = bround((x-0.5) * DPI, -PI, PI);
		
		var g:Number = (y-0.5) * -DPI;
		var lat:Number = 2.0 * Math.atan( Math.exp(g) ) - HPI;
		
		out.lat = lat * 180.0 / PI;
		out.lng = lng * 180.0 / PI;
		return true;
	}

	private static function bround(v:Number, min:Number, max:Number):Number
	{
		if (v>max) return max;
		if (v<min) return min;
		return v;
	}
}

class LatLng
{
	public var lng:Number, lat:Number, alt:int;
	public function toString():String
	{
		return lng+","+lat+","+alt;
	}
}

interface IGraphics
{
	function beginFill(c:uint):void;
	function endFill():void;
	function moveTo(x:Number, y:Number):void;
	function lineTo(x:Number, y:Number):void;
}