basicgraphicalelement.java

jacckit的说明文档,介绍了使用说明,各种接口的使用,是个好的帮助文章

/*
 * Copyright 2003-2004, Franz-Josef Elmer, All rights reserved
 *
 * This library 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 2.1 of the License, or
 * (at your option) any later version.
 *
 * This program 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
 * (http://www.gnu.org/copyleft/lesser.html).
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package jcckit.graphic;

/**
 *  Abstract superclass of all basic {@link GraphicalElement
 *  GraphicalElements}. Concrete subclasses have to implement
 *  the method {@link GraphicalElement#renderWith}.
 *
 *  @author Franz-Josef Elmer
 */
public abstract class BasicGraphicalElement implements GraphicalElement {
  private final GraphicAttributes _attributes;

  /**
   *  Creates an instance with the specified drawing attributes.
   *  Note, that a {@link Renderer} should use default attributes
   *  in the case no attributes are defined.
   *  @param attributes Drawing attributes or <tt>null</tt> if undefined.
   */
  public BasicGraphicalElement(GraphicAttributes attributes) {
    _attributes = attributes;
  }

  /**
   *  Returns the drawing attributes.
   *  @return <tt>null</tt> if undefined.
   */
  public GraphicAttributes getGraphicAttributes() {
    return _attributes;
  }

  /**
   *  Returns whether this basic graphical element has a closed shape
   *  or not. By default always <tt>true</tt>. Subclasses may override
   *  this behaviour.
   *  @return <tt>true</tt> if the shape is closed.
   */
  public boolean isClosed() {
    return true;
  }
}