Source for java.awt.font.GraphicAttribute

   1: /* GraphicAttribute.java
   2:    Copyright (C) 2003 Free Software Foundation, Inc.
   3: 
   4: This file is part of GNU Classpath.
   5: 
   6: GNU Classpath is free software; you can redistribute it and/or modify
   7: it under the terms of the GNU General Public License as published by
   8: the Free Software Foundation; either version 2, or (at your option)
   9: any later version.
  10: 
  11: GNU Classpath is distributed in the hope that it will be useful, but
  12: WITHOUT ANY WARRANTY; without even the implied warranty of
  13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14: General Public License for more details.
  15: 
  16: You should have received a copy of the GNU General Public License
  17: along with GNU Classpath; see the file COPYING.  If not, write to the
  18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19: 02110-1301 USA.
  20: 
  21: Linking this library statically or dynamically with other modules is
  22: making a combined work based on this library.  Thus, the terms and
  23: conditions of the GNU General Public License cover the whole
  24: combination.
  25: 
  26: As a special exception, the copyright holders of this library give you
  27: permission to link this library with independent modules to produce an
  28: executable, regardless of the license terms of these independent
  29: modules, and to copy and distribute the resulting executable under
  30: terms of your choice, provided that you also meet, for each linked
  31: independent module, the terms and conditions of the license of that
  32: module.  An independent module is a module which is not derived from
  33: or based on this library.  If you modify this library, you may extend
  34: this exception to your version of the library, but you are not
  35: obligated to do so.  If you do not wish to do so, delete this
  36: exception statement from your version. */
  37: 
  38: 
  39: package java.awt.font;
  40: 
  41: import java.awt.Graphics2D;
  42: import java.awt.geom.Rectangle2D;
  43: 
  44: /**
  45:  * This class represents a graphic embedded in text.
  46:  *
  47:  * @author Michael Koch
  48:  * @author Lillian Angel (langel at redhat dot com)
  49:  */
  50: public abstract class GraphicAttribute
  51: {
  52:   public static final int BOTTOM_ALIGNMENT = - 2;
  53:   public static final int CENTER_BASELINE = 1;
  54:   public static final int HANGING_BASELINE = 2;
  55:   public static final int ROMAN_BASELINE = 0;
  56:   public static final int TOP_ALIGNMENT = - 1;
  57: 
  58:   private int alignment;
  59: 
  60:   /**
  61:    * Constructor.
  62:    *
  63:    * @param alignment - the alignment to use for the graphic
  64:    */
  65:   protected GraphicAttribute(int alignment)
  66:   {
  67:     if (alignment < BOTTOM_ALIGNMENT || alignment > HANGING_BASELINE)
  68:       throw new IllegalArgumentException("Invalid alignment");
  69:     this.alignment = alignment;
  70:   }
  71: 
  72:   /**
  73:    * Draws the graphic.
  74:    *
  75:    * @param graphics - the graphics configuration to use
  76:    * @param x - the x location
  77:    * @param y - the y location
  78:    */
  79:   public abstract void draw(Graphics2D graphics, float x, float y);
  80: 
  81:   /**
  82:    * Gets the distance from the origin of its graphic to the right side of the
  83:    * bounds of its graphic.
  84:    *
  85:    * @return the advance
  86:    */
  87:   public abstract float getAdvance();
  88: 
  89:   /**
  90:    * Gets the positive distance from the origin of its graphic to the top of
  91:    * bounds.
  92:    *
  93:    * @return the ascent
  94:    */
  95:   public abstract float getAscent();
  96: 
  97:   /**
  98:    * Gets the distance from the origin of its graphic to the bottom of the bounds.
  99:    *
 100:    * @return the descent
 101:    */
 102:   public abstract float getDescent();
 103: 
 104:   /**
 105:    * Gets the alignment.
 106:    *
 107:    * @return the alignment
 108:    */
 109:   public final int getAlignment()
 110:   {
 111:     return alignment;
 112:   }
 113: 
 114:   /**
 115:    * Returns a Rectangle2D that encloses the rendered area.
 116:    * Default bounds is the rectangle (0, -ascent, advance, ascent+descent).
 117:    *
 118:    * @return the bounds of the rendered area
 119:    */
 120:   public Rectangle2D getBounds()
 121:   {
 122:     float asc = getAscent();
 123:     return new Rectangle2D.Float(0, - asc, getAdvance(), asc + getDescent());
 124:   }
 125: 
 126:   /**
 127:    * Returns the justification information for this object.
 128:    *
 129:    * @return the justification information
 130:    */
 131:   public GlyphJustificationInfo getJustificationInfo()
 132:   {
 133:     float adv = getAdvance();
 134:     return new GlyphJustificationInfo(adv, false, 2, adv / 3, adv / 3, false,
 135:                                       1, 0, 0);
 136:   }
 137: }