org.smallmind.swing.dragndrop.GhostPanel Maven / Gradle / Ivy

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/*
 * Copyright (c) 2007, 2008, 2009, 2010, 2011, 2012 David Berkman
 * 
 * This file is part of the SmallMind Code Project.
 * 
 * The SmallMind Code Project is free software, you can redistribute
 * it and/or modify it under the terms of GNU Affero General Public
 * License as published by the Free Software Foundation, either version 3
 * of the License, or (at your option) any later version.
 * 
 * The SmallMind Code Project 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 the GNU Affero General Public
 * License, along with The SmallMind Code Project. If not, see
 * .
 * 
 * Additional permission under the GNU Affero GPL version 3 section 7
 * ------------------------------------------------------------------
 * If you modify this Program, or any covered work, by linking or
 * combining it with other code, such other code is not for that reason
 * alone subject to any of the requirements of the GNU Affero GPL
 * version 3.
 */
package org.smallmind.swing.dragndrop;

import java.awt.AlphaComposite;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.image.BufferedImage;
import javax.swing.JPanel;

public class GhostPanel extends JPanel {

  private AlphaComposite composite;
  private BufferedImage dragged = null;
  private Point location = null;

  public GhostPanel () {

    setOpaque(false);
    composite = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.5f);
  }

  public void setImage (BufferedImage dragged) {

    this.dragged = dragged;
  }

  public void setImageLocation (Point location) {

    this.location = location;
  }

  public void paintComponent (Graphics g) {

    if ((dragged != null) && (location != null)) {

      Graphics2D g2 = (Graphics2D)g;

      g2.setComposite(composite);
      g2.drawImage(dragged, (int)(location.getX() - (dragged.getWidth(this) / 2)), (int)(location.getY() - (dragged.getHeight(this) / 2)), null);
    }
  }
}