TextLabel.java

/*
 * Copyright (c) 1998, 2003, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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 General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
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/*
 * (C) Copyright IBM Corp. 1998-2003 All Rights Reserved
 */

package sun.font;

import java.awt.Graphics2D;
import java.awt.Shape;

import java.awt.geom.Rectangle2D;

/**
 * A label.  
 * Visual bounds is a rect that encompasses the entire rendered area.
 * Logical bounds is a rect that defines how to position this next
 * to other objects.
 * Align bounds is a rect that defines how to align this to margins.
 * it generally allows some overhang that logical bounds would prevent.
 */
public abstract class TextLabel {

  /** 
   * Return a rectangle that surrounds the text outline when this label is rendered at x, y.
   */
  public abstract Rectangle2D getVisualBounds(float x, float y);

  /**
   * Return a rectangle that corresponds to the logical bounds of the text 
   * when this label is rendered at x, y. 
   * This rectangle is used when positioning text next to other text.
   */
  public abstract Rectangle2D getLogicalBounds(float x, float y);

  /**
   * Return a rectangle that corresponds to the alignment bounds of the text
   * when this label is rendered at x, y. This rectangle is used when positioning text next
   * to a margin.  It differs from the logical bounds in that it does not include leading or
   * trailing whitespace.
   */
  public abstract Rectangle2D getAlignBounds(float x, float y);

  /**
   * Return a rectangle that corresponds to the logical bounds of the text, adjusted
   * to angle the leading and trailing edges by the italic angle.
   */
  public abstract Rectangle2D getItalicBounds(float x, float y);

  /**
   * Return an outline of the characters in the label when rendered at x, y.
   */
  public abstract Shape getOutline(float x, float y);

  /**
   * Render the label at x, y in the graphics.
   */
  public abstract void draw(Graphics2D g, float x, float y);

  /**
   * A convenience method that returns the visual bounds when rendered at 0, 0.
   */
  public Rectangle2D getVisualBounds() {
    return getVisualBounds(0f, 0f);
  }

  /**
   * A convenience method that returns the logical bounds when rendered at 0, 0.
   */
  public Rectangle2D getLogicalBounds() {
    return getLogicalBounds(0f, 0f);
  }

  /**
   * A convenience method that returns the align bounds when rendered at 0, 0.
   */
  public Rectangle2D getAlignBounds() {
    return getAlignBounds(0f, 0f);
  }

  /**
   * A convenience method that returns the italic bounds when rendered at 0, 0.
   */
  public Rectangle2D getItalicBounds() {
    return getItalicBounds(0f, 0f);
  }

  /**
   * A convenience method that returns the outline when rendered at 0, 0.
   */
  public Shape getOutline() {
    return getOutline(0f, 0f);
  }

  /**
   * A convenience method that renders the label at 0, 0.
   */
  public void draw(Graphics2D g) {
    draw(g, 0f, 0f);
  }
}