package com.almondmendoza.CanvasDrawing;

import java.util.ArrayList;

import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Path;
import android.os.Bundle;
import android.view.MotioneventonEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

public class CanvasDrawingActivity extends  Activity   {
	private ArrayList<Path> _graphics = new ArrayList<Path>();
	private Paint mPaint;
	
	
	
	@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(new DrawingPanel(this));
        mPaint = new Paint();
        mPaint.setDither(true);
        mPaint.setColor(0xFFFFFF00);
        mPaint.setStyle(Paint.Style.STROKE);
        mPaint.setStrokeJoin(Paint.Join.ROUND);
        mPaint.setStrokeCap(Paint.Cap.ROUND);
        mPaint.setStrokeWidth(3);
		
	}
	
	
	
	class DrawingPanel extends SurfaceView implements SurfaceHolder.Callback {
		private DrawingThread _thread;
		private Path path;
		
		public DrawingPanel(Context context) {
			super(context);
            getHolder().addCallback(this);
            _thread = new DrawingThread(getHolder(), this);
		}
		
		@Override
        public boolean onTouchEvent(MotionEvent event) {
            synchronized (_thread.getSurfaceHolder()) {
            	if(event.getAction() == MotionEvent.ACTION_DOWN){
            		path = new Path();
            		path.moveTo(event.getX(), event.getY());
            		path.lineTo(event.getX(), event.getY());
            	}else if(event.getAction() == MotionEvent.ACTION_MOVE){
            		path.lineTo(event.getX(), event.getY());
            	}else if(event.getAction() == MotionEvent.ACTION_UP){
            		path.lineTo(event.getX(), event.getY());
            		_graphics.add(path);
            	}
            	
            	return true;
            }
		}
		
		@Override
        public void onDraw(Canvas canvas) {
			for (Path path : _graphics) {
				//canvas.drawPoint(graphic.x, graphic.y, mPaint);
				canvas.drawPath(path, mPaint);
			}
		}
		
		public void surfaceChanged(SurfaceHolder holder, int format, int width,
								   int height) {
			// TODO Auto-generated method stub
			
		}
		
		public void surfaceCreated(SurfaceHolder holder) {
			// TODO Auto-generated method stub
			_thread.setRunning(true);
            _thread.start();
		}
		
		public void surfaceDestroyed(SurfaceHolder holder) {
			// TODO Auto-generated method stub
			boolean retry = true;
            _thread.setRunning(false);
            while (retry) {
                try {
                    _thread.join();
                    retry = false;
                } catch (InterruptedException e) {
                    // we will try it again and again...
                }
            }
		}
	}
	
	class DrawingThread extends Thread {
        private SurfaceHolder _surfaceHolder;
        private DrawingPanel _panel;
        private boolean _run = false;
		
        public DrawingThread(SurfaceHolder surfaceHolder, DrawingPanel panel) {
            _surfaceHolder = surfaceHolder;
            _panel = panel;
        }
		
        public void setRunning(boolean run) {
            _run = run;
        }
		
        public SurfaceHolder getSurfaceHolder() {
            return _surfaceHolder;
        }
		
        @Override
        public void run() {
            Canvas c;
            while (_run) {
                c = null;
                try {
                    c = _surfaceHolder.lockCanvas(null);
                    synchronized (_surfaceHolder) {
                        _panel.onDraw(c);
                    }
                } finally {
                    // do this in a finally so that if an exception is thrown
                    // during the above, we don't leave the Surface in an
                    // inconsistent state
                    if (c != null) {
                        _surfaceHolder.unlockCanvasAndPost(c);
                    }
                }
            }
        }
    }
	
	
	
}