graphicsinfox.java

ALGAE是一个快速创建算法演示的框架。目前支持的算法实现语言包括java和c

package edu.odu.cs.zeil.AlgAE.Client.DataViewer.DataGraph;

import java.awt.Canvas;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Graphics;

import edu.odu.cs.zeil.AlgAE.Client.IncrementControl;

/**
 * An extended set of information about the graphics context in which
 * the data graph will be written, including support for double-buffered
 * implementations.
 *
 * @author Steven J. Zeil
 */
public abstract class GraphicsInfo 
{
  /**
   *  The graphics context in which to display the graph.
   *  This is valid only between an <code>openGraphics</code>,
   *  <code>closeGraphics</code> pair.
   *
   *  @see edu.odu.cs.zeil.AlgAE.Client.DataViewer.DataGraph.GraphicsInfo.openGraphics
   *  @see edu.odu.cs.zeil.AlgAE.Client.DataViewer.DataGraph.GraphicsInfo.closeGraphics
   */
  public Graphics g;

  /**
   *  The size of the area in which the graph is to be drawn.
   */
  public Dimension canvasSize;

  /**
   *  The font to be used for node and edge labels.
   */
  public Font font;

  /**
   *  The size of the font (in points) to be used for node and edge labels.
   */
  public int fontSize;

  /**
   *  Indicates the amount of space (in pixels/graphics units) to be left
   *  as a border to each side and above and below the text of a node.  
   *  This size should be proportional to the fontSize.
   *  @see openGraphics
   */
  public Dimension textOffset;

  /**
   *  Information about incremental drawing.
   *  @see edu.odu.cs.zeil.AlgAE.Client.DataViewer.DataGraph.Graph.initiateMovement
   */
  public IncrementControl increment;


  /**
   *  Number of major iterations to be employed when repositioning
   *  nodes.
   */
  public int repositionEffort;


  /**
   *  Are nodes repositioned automatically at the end of each frame?
   */
  public boolean autoArranging;
  

  /**
   *  The canvas that this graphic information is associated with.
   */
  public Canvas canvas;

  public GraphicsInfo()
  {
    g = null;
    fontSize = 16;
    canvasSize = new Dimension(10, 10);
    textOffset = new Dimension (fontSize/2, fontSize/2);
    increment = new IncrementControl();
    repositionEffort = 3;
    autoArranging = true;
  }

  /**
   *  Initialize the graphics data member <code>g</code> to a valid
   *  graphics context and sets the canvasSize and textOffset values.
   */
  public abstract void openGraphics();


  /**
   *  Indicates that the graphics data member <code>g</code> is no longer
   *  in use.
   *  @param wasWrittenTo  Input parameter, true if anything has been
   *     written to the graphics context since it was opened.
   *     False if we were "only looking".
   */
  public abstract void closeGraphics(boolean wasWrittenTo);
  
}