content: // ===============================================================================
  // Authors: AFRL/RQQD
  // Organization: Air Force Research Laboratory, Aerospace Systems Directorate, Power and Control Division
  // 
  // Copyright (c) 2017 Government of the United State of America, as represented by
  // the Secretary of the Air Force.  No copyright is claimed in the United States under
  // Title 17, U.S. Code.  All Other Rights Reserved.
  // ===============================================================================
  
  /*
   * GRAL: GRAphing Library for Java(R)
   *
   * (C) Copyright 2009-2013 Erich Seifert <dev[at]erichseifert.de>,
   * Michael Seifert <mseifert[at]error-reports.org>
   *
   * This file is part of GRAL.
   *
   * GRAL is free software: you can redistribute it and/or modify
   * it under the terms of the GNU Lesser General Public License as published by
   * the Free Software Foundation, either version 3 of the License, or
   * (at your option) any later version.
   *
   * GRAL 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 Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public License
   * along with GRAL.  If not, see <http://www.gnu.org/licenses/>.
   */
  package de.erichseifert.gral.ui;
  
  import java.awt.Dimension;
  import java.awt.Graphics;
  import java.awt.Graphics2D;
  import java.awt.Rectangle;
  import java.awt.RenderingHints;
  import java.awt.geom.Dimension2D;
  
  import javax.swing.JPanel;
  
  import de.erichseifert.gral.graphics.Drawable;
  import de.erichseifert.gral.graphics.DrawingContext;
  
  /**
   * A class that represents an adapter between the components of this library
   * and Swing. It displays a single {@code Drawable} in a {@code JPanel}.
   */
  public class DrawablePanel extends JPanel {
  	/** Version id for serialization. */
  	private static final long serialVersionUID = 1036506991203257170L;
  
  	/** Drawable that should be displayed. */
  	private final Drawable drawable;
  
  	/** Defines whether this panel uses antialiasing. */
  	private boolean antialiased;
  
  	/**
  	 * Initializes a new instance with the specified {@code Drawable}.
  	 * Antialiasing is enabled by default.
  	 * @param drawable {@code Drawable} to be displayed
  	 */
  	public DrawablePanel(Drawable drawable) {
  		this.drawable = drawable;
  		setOpaque(false);
  		antialiased = true;
  	}
  
  	/**
  	 * Returns the {@code Drawable} instance that is displayed by this
  	 * panel.
  	 * @return {@code Drawable} instance
  	 */
  	public Drawable getDrawable() {
  		return drawable;
  	}
  
  	@Override
  	protected void paintComponent(Graphics g) {
  		super.paintComponent(g);
  		if (isVisible()) {
  			Graphics2D graphics = (Graphics2D) g;
  			if (isAntialiased()) {
  				graphics.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
  			}
  
  			getDrawable().draw(new DrawingContext(graphics));
  		}
  	}
  
  	@Override
  	public void setBounds(Rectangle bounds) {
  		super.setBounds(bounds);
  		getDrawable().setBounds(bounds);
  	}
  
  	@Override
  	public void setBounds(int x, int y, int width, int height) {
  		super.setBounds(x, y, width, height);
  		getDrawable().setBounds(0.0, 0.0, width, height);
  	}
  
  	@Override
  	public Dimension getPreferredSize() {
  		Dimension dims = super.getPreferredSize();
  		Dimension2D dimsPlot = getDrawable().getPreferredSize();
  		dims.setSize(dimsPlot);
  		return dims;
  	}
  
  	@Override
  	public Dimension getMinimumSize() {
  		return super.getPreferredSize();
  	}
  
  	/**
  	 * Returns whether antialiasing is applied.
  	 * @return {@code true} if the panel uses antialiasing, {@code false} otherwise.
  	 */
  	public boolean isAntialiased() {
  		return antialiased;
  	}
  
  	/**
  	 * Sets whether antialiasing should be applied.
  	 * @param antialiased {@code true} if the panel should use antialiasing, {@code false} otherwise.
  	 */
  	public void setAntialiased(boolean antialiased) {
  		this.antialiased = antialiased;
  	}
  }
  