package 
{
import flash.display.Sprite;
import flash.display.StageAlign;
import flash.display.StageScaleMode;
import flash.events.*;
import flash.media.Camera;
import flash.media.Video;
import flash.events.Event;
import flash.display.BitmapData;
import flash.display.Bitmap;
import flash.text.TextField;

public class AS3EdgeAndMotion extends Sprite
{
	private var video:Video;
	private var motionBM:Bitmap;
	private var edgeBM:Bitmap; // the output bitmap for the gradient filter	
	var prevBitmapData:BitmapData;
	
	// these are just labels
	private var inputTxt:TextField;
	private var edgeTxt:TextField;
	private var motionTxt:TextField;
	private var errTxt:TextField;
	private var msgTxt:TextField;
	
	
	public function AS3EdgeAndMotion()
	{
		stage.scaleMode = StageScaleMode.EXACT_FIT;
		stage.align = StageAlign.TOP_LEFT;
		
		try {
		var camera:Camera = Camera.getCamera();
		camera.setMode(256, 196, 15);
		if (camera != null)
		{
		   	// setup camera and bitmaps
			video = new Video(camera.width, camera.height);
			video.attachCamera(camera);
			video.x = 8;
			video.y = 8;
			addChild(video);
			video.addEventListener(Event.ENTER_FRAME, update);
			
			motionBM = new Bitmap();
			addChild(motionBM);
			motionBM.x = video.x + video.width + 8;
			motionBM.y = video.y;
			
			
			edgeBM = new Bitmap();
			addChild(edgeBM);
			edgeBM.x = video.x;
			edgeBM.y = video.y + video.height+ 8;
			
			prevBitmapData = new BitmapData(video.width, video.height);
			
			// setup labels
			inputTxt = new TextField();
			inputTxt.x = video.x+10;
			inputTxt.y = video.y+10;
			inputTxt.htmlText = "<font face='Arial'>Input Video</font>";
			addChild(inputTxt);
			
			edgeTxt = new TextField();
			edgeTxt.x = edgeBM.x+10;
			edgeTxt.y = edgeBM.y+10;
			edgeTxt.textColor = 0xFFFFFF;
			edgeTxt.htmlText = "<font face='Arial'>Edge Detector</font>";
			addChild(edgeTxt);

			motionTxt = new TextField();
			motionTxt.x = motionBM.x+10;
			motionTxt.y = motionBM.y+10;
			motionTxt.textColor = 0xFFFFFF;
			motionTxt.htmlText = "<font face='Arial'>Motion Detector</font>";
			addChild(motionTxt);

			}
		else { showErrMsg();}} 
		catch (e:*){ showErrMsg(); }
		
		msgTxt = new TextField;
		msgTxt.x = 280;
		msgTxt.y = 220;
		msgTxt.textColor = 0x0;
		msgTxt.width = 200;
		msgTxt.multiline = true;
		msgTxt.wordWrap = true;
		msgTxt.htmlText = "<font face='Arial'>If you can't see any video, Flash can't find your camera. If you have a camera, check your Flash Player settings.</font>";
		addChild(msgTxt);
	}
	
	private function showErrMsg():void
	{
		errTxt = new TextField();
		errTxt.x = 100;
		errTxt.y = 100;
		errTxt.textColor = 0xFF0000;
		errTxt.htmlText = "<font face='Arial'>No Camera Detected!!!</font>";
		addChild(errTxt);
	}
	
	private function update(e:Event):void
	{
		var x:int;
		var y:int;
		var p:uint;
		var p2:uint;
		var p3:uint;
		var r:int;
		var g:int;
		var b:int;
		var r2:int;
		var g2:int;
		var b2:int;
		var r3:int;
		var g3:int;
		var b3:int;
		var outR:int;
		var outG:int;
		var outB:int;
		var diff:int;
		
		var inputBitmap:BitmapData = new BitmapData(video.width, video.height);
		inputBitmap.draw(video);
		
		var newMotionBM:BitmapData = new BitmapData(video.width, video.height);
		var newEdgeBM:BitmapData = new BitmapData(video.width, video.height);
		
		// motion detector
		for(y = 0; y < inputBitmap.height; ++y)
		{
			for(x = 0; x < inputBitmap.width; ++x)
			{
				p = inputBitmap.getPixel(x, y);
				r = (p & 0xFF0000) >> 16;
				g = (p & 0x00FF00) >> 8;
				b = (p & 0x0000FF);
				
				p2 = prevBitmapData.getPixel(x, y);
				r2 = (p2 & 0xFF0000) >> 16;
				g2 = (p2 & 0x00FF00) >> 8;
				b2 = (p2 & 0x0000FF);
				
				diff = Math.min(255, (2 * Math.abs(r - r2) + 2 * Math.abs(g - g2) + 2 * Math.abs(b - b2)) / 3);
				
				outR = diff;
				outG = diff;
				outB = diff;
				
				newMotionBM.setPixel(x, y, (outR << 16) + (outG << 8) + outB);
			}
		}
		
		// edge detector
		for(y = 0; y < inputBitmap.height -1; ++y)
		{
			for(x = 0; x < inputBitmap.width -1; ++x)
			{
				p = inputBitmap.getPixel(x, y);
				r = (p & 0xFF0000) >> 16;
				g = (p & 0x00FF00) >> 8;
				b = (p & 0x0000FF);
			
				p2  = inputBitmap.getPixel(x +1, y);
				r2 = (p2 & 0xFF0000) >> 16;
				g2 = (p2 & 0x00FF00) >> 8;
				b2 = (p2 & 0x0000FF);
				
				p3  = inputBitmap.getPixel(x, y + 1);
				r3 = (p3 & 0xFF0000) >> 16;
				g3 = (p3 & 0x00FF00) >> 8;
				b3 = (p3 & 0x0000FF);
				
				diff = Math.min(255, (2 * Math.abs(r - r2) + 2 * Math.abs(g - g2) + 2 * Math.abs(b - b2)) / 3);
				diff += Math.min(255, (2 * Math.abs(r - r3) + 2 * Math.abs(g - g3) + 2 * Math.abs(b - b3)) / 3);
			
				if( diff > 50 ) 
					newEdgeBM.setPixel(x, y,0xFFFFFF);
				else
					newEdgeBM.setPixel(x, y, 0x0);
			}
		}
		
		motionBM.bitmapData = newMotionBM;
		edgeBM.bitmapData = newEdgeBM;
		prevBitmapData = inputBitmap.clone(); 
	}
}}