dlabel.java

著名的神经网络工具箱

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/**
 *  Filename: $RCSfile: DLabel.java,v $
 *  Purpose:  Possibility to set String labels to an DElement
 *  Language: Java
 *  Compiler: JDK 1.3
 *  Authors:  Fabian Hennecke
 *  Version:  $Revision: 1.1.2.3 $
 *            $Date: 2005/02/03 17:51:19 $
 *            $Author: hoensela $
 *  Copyright (c) Dept. Computer Architecture, University of Tuebingen, Germany
 */

package wsi.ra.chart2d;

import java.awt.Graphics;
import java.awt.Point;
import java.awt.Font;
import java.awt.FontMetrics;

/**
 * Class DLabel makes it possible, to set an String label to a DElement.
 * The position of the label is determined by the position of the element it
 * belongs to and four double values:
 * pos_x and pos_y describe, where the anchor of the label relativly to the
 * rectangle of the DElement lies,
 * align_x and align_y describe the place of the anchor relativly to the size
 * of the text.
 *
 * Example:
 *
 * You want to put the label on top of the upper right corner of the displayed
 * element, in that way that it ends together with the right side of the
 * rectangle, then the values are:
 * pos_x = RIGHT,
 * pos_y = TOP,
 * align_x = RIGHT,
 * align_y = BOTTOM
 */
public class DLabel extends DComponent{

  public static final double TOP    = 1.0;
  public static final double BOTTOM = 0.0;
  public static final double LEFT   = 0.0;
  public static final double RIGHT  = 1.0;

  private Font font;
  private double pos_x, pos_y;
  private double align_x, align_y;
  private String text;
  private DElement elt;

  public DLabel( String text, DElement e ){
    this( text, e, LEFT, TOP, LEFT, TOP );
  }

  public DLabel( String text, DElement e,
                 double pos_x, double pos_y,
                 double align_x, double align_y ){
    this.text = text;
    elt = e;
    this.pos_x = pos_x;
    this.pos_y = pos_y;
    this.align_x = align_x;
    this.align_y = align_y;
  }

  public DRectangle getRectangle(){
    return elt.getRectangle();
  }

  public void paint( DMeasures m ){
    if( !parent.contains( elt ) ) {
      parent.removeDElement( this );
      return;
    }
    if( !elt.isVisible() ) return;

    Graphics g = m.getGraphics();
    if( color != null ) g.setColor( color );
    Font old_font = g.getFont();
    if( font != null ) g.setFont( font );
    FontMetrics fm = g.getFontMetrics();
    DRectangle rect = elt.getRectangle();

    int str_w = fm.stringWidth( text ),
        str_a = fm.getAscent();

    Point sw = m.getPoint(rect.x, rect.y),
          ne = m.getPoint(rect.x + rect.width, rect.y + rect.height),
          anchor = m.getPoint( rect.x + pos_x * rect.width, rect.y + pos_y * rect.height ),
          p = new Point(anchor.x - (int)(align_x * str_w ),
                        anchor.y + (int)(align_y * str_a ) );

    setDBorder( new DBorder( ne.y + fm.getAscent() - p.y,
                              sw.x - p.x,
                              p.y - sw.y + fm.getDescent(),
                              p.x + str_w - ne.x) );
    g.drawString( text, p.x, p.y );
    g.setFont( old_font );
  }

  public void setFont( Font f ){
    boolean changed = ( font == null && f != null ) || !font.equals( f );
    font = f;
    if( changed ) repaint();
  }

  public Font getFont(){ return font; }

  public String toString(){
    return "wsi.ra.chart2d.DLabel[text=\"" + text + "\", font="+font+"]";
  }
}