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JCommon is a free general purpose Java class library that is used in
several projects at www.jfree.org, including JFreeChart and
JFreeReport.
/* ========================================================================
* JCommon : a free general purpose class library for the Java(tm) platform
* ========================================================================
*
* (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
*
* Project Info: http://www.jfree.org/jcommon/index.html
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library 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 Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*
* [Java is a trademark or registered trademark of Sun Microsystems, Inc.
* in the United States and other countries.]
*
* -------------
* TextLine.java
* -------------
* (C) Copyright 2003-2005, by Object Refinery Limited and Contributors.
*
* Original Author: David Gilbert (for Object Refinery Limited);
* Contributor(s): -;
*
* $Id: TextLine.java,v 1.13 2007/11/02 17:50:35 taqua Exp $
*
* Changes
* -------
* 07-Nov-2003 : Version 1 (DG);
* 22-Dec-2003 : Added workaround for Java bug 4245442 (DG);
* 29-Jan-2004 : Added new constructor (DG);
* 22-Mar-2004 : Added equals() method and implemented Serializable (DG);
* 01-Apr-2004 : Changed java.awt.geom.Dimension2D to org.jfree.ui.Size2D
* because of JDK bug 4976448 which persists on JDK 1.3.1 (DG);
* 03-Sep-2004 : Added a method to remove a fragment (DG);
* 08-Jul-2005 : Fixed bug in calculateBaselineOffset() (DG);
*
*/
package org.jfree.text;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.io.Serializable;
import java.util.Iterator;
import java.util.List;
import org.jfree.ui.Size2D;
import org.jfree.ui.TextAnchor;
/**
* A sequence of {@link TextFragment} objects that together form a line of
* text. A sequence of text lines is managed by the {@link TextBlock} class.
*
* @author David Gilbert
*/
public class TextLine implements Serializable {
/** For serialization. */
private static final long serialVersionUID = 7100085690160465444L;
/** Storage for the text fragments that make up the line. */
private List fragments;
/**
* Creates a new empty line.
*/
public TextLine() {
this.fragments = new java.util.ArrayList();
}
/**
* Creates a new text line using the default font.
*
* @param text the text (null not permitted).
*/
public TextLine(final String text) {
this(text, TextFragment.DEFAULT_FONT);
}
/**
* Creates a new text line.
*
* @param text the text (null not permitted).
* @param font the text font (null not permitted).
*/
public TextLine(final String text, final Font font) {
this.fragments = new java.util.ArrayList();
final TextFragment fragment = new TextFragment(text, font);
this.fragments.add(fragment);
}
/**
* Creates a new text line.
*
* @param text the text (null not permitted).
* @param font the text font (null not permitted).
* @param paint the text color (null not permitted).
*/
public TextLine(final String text, final Font font, final Paint paint) {
if (text == null) {
throw new IllegalArgumentException("Null 'text' argument.");
}
if (font == null) {
throw new IllegalArgumentException("Null 'font' argument.");
}
if (paint == null) {
throw new IllegalArgumentException("Null 'paint' argument.");
}
this.fragments = new java.util.ArrayList();
final TextFragment fragment = new TextFragment(text, font, paint);
this.fragments.add(fragment);
}
/**
* Adds a text fragment to the text line.
*
* @param fragment the text fragment (null not permitted).
*/
public void addFragment(final TextFragment fragment) {
this.fragments.add(fragment);
}
/**
* Removes a fragment from the line.
*
* @param fragment the fragment to remove.
*/
public void removeFragment(final TextFragment fragment) {
this.fragments.remove(fragment);
}
/**
* Draws the text line.
*
* @param g2 the graphics device.
* @param anchorX the x-coordinate for the anchor point.
* @param anchorY the y-coordinate for the anchor point.
* @param anchor the point on the text line that is aligned to the anchor
* point.
* @param rotateX the x-coordinate for the rotation point.
* @param rotateY the y-coordinate for the rotation point.
* @param angle the rotation angle (in radians).
*/
public void draw(final Graphics2D g2,
final float anchorX, final float anchorY,
final TextAnchor anchor,
final float rotateX, final float rotateY,
final double angle) {
float x = anchorX;
final float yOffset = calculateBaselineOffset(g2, anchor);
final Iterator iterator = this.fragments.iterator();
while (iterator.hasNext()) {
final TextFragment fragment = (TextFragment) iterator.next();
final Size2D d = fragment.calculateDimensions(g2);
fragment.draw(
g2, x, anchorY + yOffset, TextAnchor.BASELINE_LEFT,
rotateX, rotateY, angle
);
x = x + (float) d.getWidth();
}
}
/**
* Calculates the width and height of the text line.
*
* @param g2 the graphics device.
*
* @return The width and height.
*/
public Size2D calculateDimensions(final Graphics2D g2) {
double width = 0.0;
double height = 0.0;
final Iterator iterator = this.fragments.iterator();
while (iterator.hasNext()) {
final TextFragment fragment = (TextFragment) iterator.next();
final Size2D dimension = fragment.calculateDimensions(g2);
width = width + dimension.getWidth();
height = Math.max(height, dimension.getHeight());
}
return new Size2D(width, height);
}
/**
* Returns the first text fragment in the line.
*
* @return The first text fragment in the line.
*/
public TextFragment getFirstTextFragment() {
TextFragment result = null;
if (this.fragments.size() > 0) {
result = (TextFragment) this.fragments.get(0);
}
return result;
}
/**
* Returns the last text fragment in the line.
*
* @return The last text fragment in the line.
*/
public TextFragment getLastTextFragment() {
TextFragment result = null;
if (this.fragments.size() > 0) {
result = (TextFragment) this.fragments.get(this.fragments.size()
- 1);
}
return result;
}
/**
* Calculate the offsets required to translate from the specified anchor
* position to the left baseline position.
*
* @param g2 the graphics device.
* @param anchor the anchor position.
*
* @return The offsets.
*/
private float calculateBaselineOffset(final Graphics2D g2,
final TextAnchor anchor) {
float result = 0.0f;
Iterator iterator = this.fragments.iterator();
while (iterator.hasNext()) {
TextFragment fragment = (TextFragment) iterator.next();
result = Math.max(result,
fragment.calculateBaselineOffset(g2, anchor));
}
return result;
}
/**
* Tests this object for equality with an arbitrary object.
*
* @param obj the object to test against (null permitted).
*
* @return A boolean.
*/
public boolean equals(final Object obj) {
if (obj == null) {
return false;
}
if (obj == this) {
return true;
}
if (obj instanceof TextLine) {
final TextLine line = (TextLine) obj;
return this.fragments.equals(line.fragments);
}
return false;
}
/**
* Returns a hash code for this object.
*
* @return A hash code.
*/
public int hashCode() {
return (this.fragments != null ? this.fragments.hashCode() : 0);
}
}
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