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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.]
*
* ----------
* Align.java
* ----------
* (C) Copyright 2000-2004, by Object Refinery Limited and Contributors.
*
* Original Author: Christian W. Zuckschwerdt;
* Contributor(s): David Gilbert (for Object Refinery Limited);
*
* $Id: Align.java,v 1.5 2005/10/18 13:18:34 mungady Exp $
*
* Changes (from 30-May-2002)
* --------------------------
* 30-May-2002 : Added title (DG);
* 13-Oct-2002 : Fixed errors reported by Checkstyle (DG);
*
*/
package org.jfree.ui;
import java.awt.geom.Rectangle2D;
/**
* A utility class for aligning rectangles.
*
* @author David Gilbert
*/
public final class Align {
/** Center alignment. */
public static final int CENTER = 0x00;
/** Top alignment. */
public static final int TOP = 0x01;
/** Bottom alignment. */
public static final int BOTTOM = 0x02;
/** Left alignment. */
public static final int LEFT = 0x04;
/** Right alignment. */
public static final int RIGHT = 0x08;
/** Top/Left alignment. */
public static final int TOP_LEFT = TOP | LEFT;
/** Top/Right alignment. */
public static final int TOP_RIGHT = TOP | RIGHT;
/** Bottom/Left alignment. */
public static final int BOTTOM_LEFT = BOTTOM | LEFT;
/** Bottom/Right alignment. */
public static final int BOTTOM_RIGHT = BOTTOM | RIGHT;
/** Horizontal fit. */
public static final int FIT_HORIZONTAL = LEFT | RIGHT;
/** Vertical fit. */
public static final int FIT_VERTICAL = TOP | BOTTOM;
/** Complete fit. */
public static final int FIT = FIT_HORIZONTAL | FIT_VERTICAL;
/** North alignment (same as TOP). */
public static final int NORTH = TOP;
/** South alignment (same as BOTTOM). */
public static final int SOUTH = BOTTOM;
/** West alignment (same as LEFT). */
public static final int WEST = LEFT;
/** East alignment (same as RIGHT). */
public static final int EAST = RIGHT;
/** North/West alignment (same as TOP_LEFT). */
public static final int NORTH_WEST = NORTH | WEST;
/** North/East alignment (same as TOP_RIGHT). */
public static final int NORTH_EAST = NORTH | EAST;
/** South/West alignment (same as BOTTOM_LEFT). */
public static final int SOUTH_WEST = SOUTH | WEST;
/** South/East alignment (same as BOTTOM_RIGHT). */
public static final int SOUTH_EAST = SOUTH | EAST;
/**
* Private constructor.
*/
private Align() {
super();
}
/**
* Aligns one rectangle (rect) relative to another rectangle (frame).
*
* @param rect the rectangle to be aligned (null not permitted).
* @param frame the reference frame (null not permitted).
* @param align the alignment code.
*/
public static void align(final Rectangle2D rect, final Rectangle2D frame, final int align) {
double x = frame.getCenterX() - rect.getWidth() / 2.0;
double y = frame.getCenterY() - rect.getHeight() / 2.0;
double w = rect.getWidth();
double h = rect.getHeight();
if ((align & FIT_VERTICAL) == FIT_VERTICAL) {
h = frame.getHeight();
}
if ((align & FIT_HORIZONTAL) == FIT_HORIZONTAL) {
w = frame.getWidth();
}
if ((align & TOP) == TOP) {
y = frame.getMinY();
}
if ((align & BOTTOM) == BOTTOM) {
y = frame.getMaxY() - h;
}
if ((align & LEFT) == LEFT) {
x = frame.getX();
}
if ((align & RIGHT) == RIGHT) {
x = frame.getMaxX() - w;
}
rect.setRect(x, y, w, h);
}
}