package com.example.android.surfaceview;

import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.os.Bundle;
import android.util.Log;
import android.view.Display;
import android.view.MotionEvent;
import android.view.SurfaceView;
import android.view.WindowManager;

public class MyGame extends Activity {
	MyView view;
	Thread mainThread;
	//Boolean isRunning;

	class MyView extends SurfaceView implements Runnable {
		Bitmap droid;
		int d_x, d_y, d_dx, d_dy;

		public MyView(Context context) {
			super(context);
			droid = BitmapFactory.decodeResource(context.getResources(),
					R.drawable.droid);

			Display disp = ((WindowManager)getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
			d_x = (disp.getWidth() - droid.getWidth()) / 2;
			d_y = (disp.getHeight() - droid.getHeight()) / 2 - 20;
			mainThread = new Thread(this);
			mainThread.start();
		}

		void doDraw() {
			//Log.d("MyGame", "doDraw()");
			Canvas canvas = getHolder().lockCanvas();
			if (canvas != null) {
				if (d_x > canvas.getWidth())
					d_x = - droid.getWidth();
				else if (d_x < - droid.getWidth())
					d_x = canvas.getWidth();
				if (d_y > canvas.getHeight())
					d_y = - droid.getHeight();
				else if (d_y < - droid.getHeight())
					d_y = canvas.getHeight();
				canvas.drawColor(Color.BLACK);
				canvas.drawBitmap(droid, d_x, d_y, null);
				getHolder().unlockCanvasAndPost(canvas);
			}
		}

		@Override
		public boolean onTouchEvent(MotionEvent event) {
			Log.d("MyGame", "onTouchEvent()");
			int x = d_x + droid.getWidth() / 2;
			int y = d_y + droid.getHeight() / 2;
			d_dx += (event.getX() - x) / 50;
			d_dy += (event.getY() - y) / 50;
			return true;
		}

		public void run() {
			while (true) {
				d_x += d_dx;
				d_y += d_dy;
				doDraw();
				try {
					Thread.sleep(100);
				} catch (InterruptedException e) {}
			}
		}
	}

	@Override
	protected void onCreate(final Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setTitle("My Game");
		view = new MyView(this);
		setContentView(view);
	}
	@Override
	protected void onDestroy() {
		super.onDestroy();
		if (mainThread != null && mainThread.isAlive()) {
			mainThread.interrupt();
		}
	}
}