/*
 * Open Source Physics software is free software as described near the bottom of this code file.
 *
 * For additional information and documentation on Open Source Physics please see:
 * <http://www.opensourcephysics.org/>
 */

package org.opensourcephysics.display;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.geom.AffineTransform;
import java.awt.geom.Point2D;
import java.awt.image.ImageObserver;

/**
 * An image is bounded by hot spots for dragging and resizing.
 *
 * @author W. Christian
 * @version 1.0
 */
public class InteractiveImage extends InteractiveShape implements ImageObserver {
  protected Image image;

  /**
   * Constructs an interactive image centered at the given location.
   *
   * @param x double
   * @param y double
   * @param image Image
   */
  public InteractiveImage(Image image, double x, double y) {
    super(null, x, y);
    this.image = image;
    width = image.getWidth(this);
    width = Math.max(0, width);   // -1 if image is not available
    height = image.getHeight(this);
    height = Math.max(0, height); // -1 if image is not available
    shapeClass = image.getClass().getName();
    setPixelSized(true);
  }

  /**
 * Determines if the shape is enabled and if the given pixel coordinates are within the image.
 *
 * @param panel DrawingPanel
 * @param xpix int
 * @param ypix int
 * @return boolean
 */
  public boolean isInside(DrawingPanel panel, int xpix, int ypix) {
    if((image==null)||!enabled) {
      return false;
    }
    int r = Math.min(image.getWidth(null)/2, image.getHeight(null)/2)+1;
    if((Math.abs(panel.xToPix(x)-xpix)<r)&&(Math.abs(panel.yToPix(y)-ypix)<r)) {
      return true;
    }
    return false;
  }

  /**
   * Draws the image.
   *
   * @param panel  the world in which the arrow is viewed
   * @param g  the graphics context upon which to draw
   */
  public void draw(DrawingPanel panel, Graphics g) {
    toPixels = panel.getPixelTransform();
    Point2D pt = new Point2D.Double(x, y);
    pt = toPixels.transform(pt, pt);
    Graphics2D g2 = (Graphics2D) g;
    g2.translate(pt.getX(), pt.getY());
    AffineTransform trans = new AffineTransform();
    trans.translate(-width/2, -height/2);
    trans.rotate(-theta, width/2, height/2);
    trans.scale(width/image.getWidth(null), height/image.getHeight(null));
    g2.drawImage(image, trans, null);
    g2.translate(-pt.getX(), -pt.getY());
  }

  public boolean imageUpdate(Image img, int infoflags, int x, int y, int width, int height) {
    if((infoflags&ImageObserver.WIDTH)==1) {
      this.width = width;
    }
    if((infoflags&ImageObserver.HEIGHT)==1) {
      this.height = height;
    }
    if((infoflags&ImageObserver.ALLBITS)==1) {
      return false; // further updates not needed
    }
    return true;
  }

}

/*
 * Open Source Physics software is free software; you can redistribute
 * it and/or modify it under the terms of the GNU General Public License (GPL) as
 * published by the Free Software Foundation; either version 2 of the License,
 * or(at your option) any later version.

 * Code that uses any portion of the code in the org.opensourcephysics package
 * or any subpackage (subdirectory) of this package must must also be be released
 * under the GNU GPL license.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston MA 02111-1307 USA
 * or view the license online at http://www.gnu.org/copyleft/gpl.html
 *
 * Copyright (c) 2007  The Open Source Physics project
 *                     http://www.opensourcephysics.org
 */