/*
 * Copyright (c) 1995, 2008, Oracle and/or its affiliates. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Oracle or the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

import java.awt.*;
import java.awt.event.*;
import java.applet.Applet;
import java.awt.image.*;

/*
 * This applet allows the user to move a texture painted rectangle around the applet
 * window.  The rectangle flickers and draws slowly because this applet does not use 
 * double buffering.
 */
public class ShapeMover extends Applet {

  static protected Label label;

  public void init() {

    setLayout(new BorderLayout());
    add(new SMCanvas());

    label = new Label("Drag rectangle around within the area");
    add("South", label);
  }

  public static void main(String s[]) {
    Frame f = new Frame("ShapeMover");
    f.addWindowListener(new WindowAdapter() {

      public void windowClosing(WindowEvent e) {
        System.exit(0);
      }
    });
    Applet applet = new ShapeMover();
    f.add("Center", applet);
    applet.init();
    f.pack();
    f.setSize(new Dimension(550, 250));
    f.setVisible(true);
  }
}

class SMCanvas extends Canvas implements MouseListener, MouseMotionListener {

  Rectangle rect = new Rectangle(0, 0, 100, 50);
  BufferedImage bi;
  Graphics2D big;
  // Holds the coordinates of the user's last mousePressed event.
  int last_x, last_y;
  boolean firstTime = true;
  TexturePaint fillPolka, strokePolka;
  Rectangle area;
  // True if the user pressed, dragged or released the mouse outside of the rectangle; false otherwise.
  boolean pressOut = false;

  public SMCanvas() {
    setBackground(Color.white);
    addMouseMotionListener(this);
    addMouseListener(this);

    // Creates the fill texture paint pattern.
    bi = new BufferedImage(5, 5, BufferedImage.TYPE_INT_RGB);
    big = bi.createGraphics();
    big.setColor(Color.pink);
    big.fillRect(0, 0, 7, 7);
    big.setColor(Color.cyan);
    big.fillOval(0, 0, 3, 3);
    Rectangle r = new Rectangle(0, 0, 5, 5);
    fillPolka = new TexturePaint(bi, r);
    big.dispose();

    //Creates the stroke texture paint pattern.
    bi = new BufferedImage(5, 5, BufferedImage.TYPE_INT_RGB);
    big = bi.createGraphics();
    big.setColor(Color.cyan);
    big.fillRect(0, 0, 7, 7);
    big.setColor(Color.pink);
    big.fillOval(0, 0, 3, 3);
    r = new Rectangle(0, 0, 5, 5);
    strokePolka = new TexturePaint(bi, r);
    big.dispose();

  }

  // Handles the event of the user pressing down the mouse button.
  public void mousePressed(MouseEvent e) {
    last_x = rect.x - e.getX();
    last_y = rect.y - e.getY();

    // Checks whether or not the cursor is inside of the rectangle while the
    // user is pressing the mouse.
    if (rect.contains(e.getX(), e.getY())) {
      pressOut = false;
      updateLocation(e);
    } else {
      ShapeMover.label.setText("First position the cursor on the rectangle "
        + "and then drag.");
      pressOut = true;
    }
  }

  // Handles the event of a user dragging the mouse while holding down the
  // mouse button.
  public void mouseDragged(MouseEvent e) {
    if (!pressOut) {
      updateLocation(e);
    } else {
      ShapeMover.label.setText("First position the cursor on the rectangle "
        + "and then drag.");
    }
  }

  // Handles the event of a user releasing the mouse button.
  public void mouseReleased(MouseEvent e) {

    // Checks whether or not the cursor is inside of the rectangle when the
    // user releases the mouse button.
    if (rect.contains(e.getX(), e.getY())) {
      if (!pressOut) {
        updateLocation(e);
      }
    } else {
      ShapeMover.label.setText("First position the cursor on the rectangle "
        + "and then drag.");
    }
  }
  // This method required by MouseListener.

  public void mouseMoved(MouseEvent e) {
  }

  // These methods are required by MouseMotionListener.
  public void mouseClicked(MouseEvent e) {
  }

  public void mouseExited(MouseEvent e) {
  }

  public void mouseEntered(MouseEvent e) {
  }

  // Updates the coordinates representing the location of the current rectangle.
  public void updateLocation(MouseEvent e) {
    rect.setLocation(last_x + e.getX(), last_y + e.getY());
    /*
     * Updates the label to reflect the location of the
     * current rectangle
     * if checkRect returns true; otherwise, returns error message.
     */
    if (checkRect()) {
      ShapeMover.label.setText("Rectangle located at "
              + rect.getX() + ", "
              + rect.getY());
    } else {
      ShapeMover.label.setText("Please don't try to "
              + " drag outside the area.");
    }

    repaint();
  }

  public void paint(Graphics g) {
    update(g);
  }

  public void update(Graphics g) {
    Graphics2D g2 = (Graphics2D) g;
    Dimension dim = getSize();
    int w = (int) dim.getWidth();
    int h = (int) dim.getHeight();
    g2.setStroke(new BasicStroke(8.0f));

    if (firstTime) {
      area = new Rectangle(dim);
      rect.setLocation(w / 2 - 50, h / 2 - 25);
      firstTime = false;
    }

    // Clears the rectangle that was previously drawn.
    g2.setPaint(Color.white);
    g2.fillRect(0, 0, w, h);

    // Draws and fills the newly positioned rectangle.
    g2.setPaint(strokePolka);
    g2.draw(rect);
    g2.setPaint(fillPolka);
    g2.fill(rect);

  }

  /*
   * Checks if the rectangle is contained within the applet window.  If the rectangle
   * is not contained withing the applet window, it is redrawn so that it is adjacent
   * to the edge of the window and just inside the window.
   */
  boolean checkRect() {

    if (area == null) {
      return false;
    }

    if (area.contains(rect.x, rect.y, 100, 50)) {
      return true;
    }
    int new_x = rect.x;
    int new_y = rect.y;

    if ((rect.x + 100) > area.getWidth()) {
      new_x = (int) area.getWidth() - 99;
    }
    if (rect.x < 0) {
      new_x = -1;
    }
    if ((rect.y + 50) > area.getHeight()) {
      new_y = (int) area.getHeight() - 49;
    }
    if (rect.y < 0) {
      new_y = -1;
    }
    rect.setLocation(new_x, new_y);
    return false;
  }
}