JGraphpadEPSAction.java :  » Graphic-Library » jgraphpad » com » jgraph » epsplugin » Java Open Source

/* 
 * $Id: JGraphpadEPSAction.java,v 1.2 2005/08/07 10:28:29 gaudenz Exp $
 * Copyright (c) 2001-2005, Gaudenz Alder
 * 
 * All rights reserved.
 * 
 * See LICENSE file for license details. If you are unable to locate
 * this file please contact info (at) jgraph (dot) com.
 */
package com.jgraph.epsplugin;

import java.awt.Component;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.geom.Rectangle2D;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.net.URL;

import javax.swing.RepaintManager;

import org.jgraph.JGraph;
import org.jibble.epsgraphics.EpsGraphics2D;

import com.jgraph.JGraphEditor;
import com.jgraph.editor.JGraphEditorAction;
import com.jgraph.pad.action.JGraphpadFileAction;

/**
 * Implements all actions that require EPSGraphics in the classpath.
 */
public class JGraphpadEPSAction extends JGraphpadFileAction {

  /**
   * Specifies the name for the <code>saveEPS</code> action.
   */
  public static final String NAME_SAVEEPS = "saveEPS";

  /**
   * Constructs a new Batik action for the specified name.
   */
  public JGraphpadEPSAction(String name, JGraphEditor editor) {
    super(name, editor);
  }

  /**
   * Executes the action based on the action name.
   * 
   * @param e
   *            The object that describes the event.
   */
  public void actionPerformed(ActionEvent e) {
    Component component = getPermanentFocusOwner();
    try {
      if (component instanceof JGraph) {
        JGraph graph = (JGraph) component;
        if (getName().equals(NAME_SAVEEPS))
          doSaveEPS(graph, 5, dlgs.fileDialog(
              getPermanentFocusOwnerOrParent(),
              getString("SaveEPSFile"), false, ".eps",
              getString("EPSFileDescription"), lastDirectory));
      }
    } catch (IOException e1) {
      dlgs
          .errorDialog(getPermanentFocusOwner(), e1
              .getLocalizedMessage());
    }
  }

  /**
   * Saves the specified graph as an EPS vector graphics file.
   * 
   * @param graph
   *            The graph to write as an EPS file.
   * @param inset
   *            The inset to use for the EPS graphics.
   * @param filename
   *            The filename to write the EPS.
   */
  public void doSaveEPS(JGraph graph, int inset, String filename)
      throws IOException {
    if (filename != null) {
      OutputStream out = editor.getModel().getOutputStream(filename);
      Object[] cells = graph.getDescendants(graph.getRoots());
      if (cells.length > 0) {
        EpsGraphics2D graphics = new EpsGraphics2D();
        graphics.setColor(graph.getBackground());
        Rectangle2D bounds = graph.toScreen(graph.getCellBounds(cells));
        Dimension d = bounds.getBounds().getSize();
        graphics.fillRect(0, 0, d.width + 2 * inset, d.height + 2
            * inset);
        graphics.translate(-bounds.getX() + inset, -bounds.getY()
            + inset);

        // Paints the graph to the svg generator with no double
        // buffering enabled to make sure we get a vector image.
        RepaintManager currentManager = RepaintManager
            .currentManager(graph);
        currentManager.setDoubleBufferingEnabled(false);
        graph.paint(graphics);
        out.write(graphics.toString().getBytes());
        currentManager.setDoubleBufferingEnabled(true);
      }

      out.close();
      if (JGraphEditor.isURL(filename)) {
        URL url = new URL(filename);
        post(url, url.getFile(), MIME_HTML, out);
      } else
        lastDirectory = new File(filename).getParentFile();
    }
  }

  /**
   * Bundle of all actions in this class.
   */
  public static class AllActions implements Bundle {

    /**
     * Holds the actions. The actions are constructed in the constructor as
     * they require an editor instance.
     */
    public JGraphEditorAction actionSaveEPS;

    /**
     * Constructs the action bundle for the specified editor.
     * 
     * @param editor
     *            The enclosing editor for this bundle.
     */
    public AllActions(JGraphEditor editor) {
      actionSaveEPS = new JGraphpadEPSAction(NAME_SAVEEPS, editor);
    }

    /*
     * (non-Javadoc)
     */
    public JGraphEditorAction[] getActions() {
      return new JGraphEditorAction[] { actionSaveEPS };
    }

    /*
     * (non-Javadoc)
     */
    public void update() {
      Component component = getPermanentFocusOwner();
      boolean e = component instanceof JGraph;
      actionSaveEPS.setEnabled(e);
    }

  }

}