/*

File: SkyCreator.java

Abstract: This is a very simple demo that creates a random image

of a starry sky. It has several star images of different sizes that are 

placed randomly on the screen. The user can drag the stars to re-arrange 

them. This code was written to illustrate the functionallity of QuartzDebug.

There is a slow and a fast version. The slow version is commented out by 

default. The slow version repaints the whole window every time a star is 

moved. And the fast version only re-paints the  dirty region. You can use 

QuartzDebug to see the different beahvior between the two versions.

Version: 1.0

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*/

import javax.swing.*;

import java.awt.*;

import java.awt.geom.*;

import java.awt.event.*;

import java.awt.image.*;

import javax.swing.*;

import java.util.*;

public class SkyCreator

{

    private final static int WIDTH = 1000;

    private final static int HEIGHT = 800;

    Random randomGenerator = new Random();

    public SkyCreator()

    {

    // create the frame and make it visible

    JFrame frame = new JFrame("SkyCreator");

    frame.getContentPane().add(new Sky());

    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    frame.setBounds(50, 50, WIDTH, HEIGHT);

    frame.setVisible(true);

    }

    public static void main(String[] args)

    {

    new SkyCreator();

    }

    // The panel represent the sky. Its job is to paint a black background and draw the individual stars. 

    // It's also responsible for handling mouse events

    private class Sky extends Panel implements MouseMotionListener, MouseListener

    {

    // the heuristic for creating the sky is there are stars of for levels. Level_1 is the brightest and closes, 

    // while Level_4 is the most far away. There also more stars that are darker than brigher.

    private final static int NUM_STARS_LEVEL_1 = 1;

    private final static int NUM_STARS_LEVEL_2 = 2;

    private final static int NUM_STARS_LEVEL_3 = 20;

    private final static int NUM_STARS_LEVEL_4 = 1500;

    private final static int NUM_STARS_LEVEL_5 = 4500;

    private final static int NUM_STARS = NUM_STARS_LEVEL_1 + NUM_STARS_LEVEL_2 + NUM_STARS_LEVEL_3 + NUM_STARS_LEVEL_4 + NUM_STARS_LEVEL_5;

    private Star[] stars = new Star[NUM_STARS];

    private Star currentStar = null;

    public Sky()

    {

        addMouseListener(this);

        addMouseMotionListener(this);

        ImageIcon icon = new ImageIcon(getClass().getResource("star1.png"));

        Image star1 = icon.getImage();    

        icon = new ImageIcon(getClass().getResource("star2.png"));

        Image star2 = icon.getImage();

        icon = new ImageIcon(getClass().getResource("star3.png"));

        Image star3 = icon.getImage();

        icon = new ImageIcon(getClass().getResource("star4.png"));

        Image star4 = icon.getImage();

        icon = new ImageIcon(getClass().getResource("star5.png"));

        Image star5 = icon.getImage();

        // Add the stars in reverse order from farthest to closest. Since we use painters algorithm to paint them

        // the one farthest need to be first in the array.

        int i = 0;

        for (int j = 0; j < NUM_STARS_LEVEL_5; j++)

        {

            stars[i++] = new Star(star5);

        }

        for (int j = 0; j < NUM_STARS_LEVEL_4; j++)

        {

            stars[i++] = new Star(star4);

        }       

        for (int j = 0; j < NUM_STARS_LEVEL_3; j++)

        {

            stars[i++] = new Star(star3);

        }

        for (int j = 0; j < NUM_STARS_LEVEL_2; j++)

        {

            stars[i++] = new Star(star2);

        }

        for (int j = 0; j < NUM_STARS_LEVEL_1; j++)

        {

            stars[i++] = new Star(star1);

        }       

    }

        public void paint(Graphics g)

        {

            // fill the background

            g.setColor(Color.black);

            g.fillRect(0, 0, getWidth(), getHeight());

        Rectangle clip = g.getClipBounds();

        // painters algorithm

        for (int i = 0; i < stars.length; i++)

        {

        // draw the stars

        stars[i].draw(g);

        }

        }

        public void mousePressed(MouseEvent e)

        {

            Point p = e.getPoint();

        for (int i = 0; i < NUM_STARS; i++)

        {

        if (stars[i].hit(p))

        {

            currentStar = stars[i];

            currentStar.startDrag(p);

        }

        }

        }

    // Slow version

//        public void mouseDragged(MouseEvent e)

//        {

//            if (currentStar != null)

//            {

//                currentStar.continueDrag(e.getPoint());

//                repaint();   /** INEFFICIENT - We only need to repaint the dirty region. Look at commented code for fast version **/

//            }

//        }

    // Fast version - also look at DragFrame.continueDrag()

        public void mouseDragged(MouseEvent e)

        {

            if (currentStar != null)

        {

                Rectangle dirtyRegion = currentStar.continueDrag(e.getPoint());

                repaint(dirtyRegion.x, dirtyRegion.y, dirtyRegion.width, dirtyRegion.height);

            }

        }

        public void mouseReleased(MouseEvent e)

        {

            currentStar = null;

        }

        public void mouseEntered(MouseEvent e)

        {

            // do nothing

        }

        public void mouseExited(MouseEvent e)

        {

            // do nothing

        }

        public void mouseMoved(MouseEvent e)

        {

            // do nothing

        }

        public void mouseClicked(MouseEvent e)

        {

            // do nothing

        }

    }

    private class Star

    {

        private int dragX = 0;

        private int dragY = 0;

        private int x;

        private int y;

        private int width;

        private int height;

    private Image image;

    public Star(Image image)

    {

        width = image.getWidth(null);

        height = image.getHeight(null);

        this.image = image;

        x = randomGenerator.nextInt(WIDTH);

        y = randomGenerator.nextInt(HEIGHT);

    }

    public void draw(Graphics g)

    {

        Rectangle clip = g.getClipBounds();

        Rectangle myBounds = new Rectangle(x, y, width, height);

        if ((clip != null) && (!clip.intersects(myBounds)))

        {

            return;

        }

        g.drawImage(image, x, y, null);

    }

        public void startDrag(Point p)

        {

            dragX = p.x;

            dragY = p.y;

        }

    // Slow Version

//        public void continueDrag(Point p)

//        {

//            int deltaX = p.x - dragX;

//            int deltaY = p.y - dragY;

//            dragX = p.x;

//            dragY = p.y;

//

//            x = x + deltaX;

//            y = y + deltaY;

//        }

    // Fast version     

    public Rectangle continueDrag(Point p)

        {

            Rectangle oldBounds = new Rectangle(x, y, width, height);

            int deltaX = p.x - dragX;

            int deltaY = p.y - dragY;

            x = x + deltaX;

            y = y + deltaY;

            Rectangle newBounds = new Rectangle(x, y, width, height);

            Rectangle dirtyRegion = newBounds.union(oldBounds);

            dragX = p.x;

            dragY = p.y;

            return dirtyRegion;

        }

        public boolean hit(Point p)

        {

            if ((p.x >= x) && (p.y >= y) && (p.x <= x + width) && (p.y <= y + height))

            {

                return true;

            }

            return false;

        }

    }

}