Compents are laid out in a circle.
/*
* 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.]
*
* -----------------
* RadialLayout.java
* -----------------
* (C) Copyright 2003, 2004, by Bryan Scott (for Australian Antarctic Division).
*
* Original Author: Bryan Scott (for Australian Antarctic Division);
* Contributor(s): David Gilbert (for Object Refinery Limited);
*
*
* Changes:
* --------
* 30-Jun-2003 : Version 1 (BS);
* 24-Jul-2003 : Completed missing Javadocs (DG);
*
*/
import java.awt.Checkbox;
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Frame;
import java.awt.Insets;
import java.awt.LayoutManager;
import java.awt.Panel;
import java.io.Serializable;
/**
* RadialLayout is a component layout manager. Compents are laid out in a
* circle. If only one component is contained in the layout it is positioned
* centrally, otherwise components are evenly spaced around the centre with
* the first component placed to the North.
*<P>
* This code was developed to display CTD rosette firing control
*
* WARNING: Not thoughly tested, use at own risk.
*
* @author Bryan Scott (for Australian Antarctic Division)
*/
public class RadialLayout implements LayoutManager, Serializable {
/** For serialization. */
private static final long serialVersionUID = -7582156799248315534L;
/** The minimum width. */
private int minWidth = 0;
/** The minimum height. */
private int minHeight = 0;
/** The maximum component width. */
private int maxCompWidth = 0;
/** The maximum component height. */
private int maxCompHeight = 0;
/** The preferred width. */
private int preferredWidth = 0;
/** The preferred height. */
private int preferredHeight = 0;
/** Size unknown flag. */
private boolean sizeUnknown = true;
/**
* Constructs this layout manager with default properties.
*/
public RadialLayout() {
super();
}
/**
* Not used.
*
* @param comp the component.
*/
public void addLayoutComponent(final Component comp) {
// not used
}
/**
* Not used.
*
* @param comp the component.
*/
public void removeLayoutComponent(final Component comp) {
// not used
}
/**
* Not used.
*
* @param name the component name.
* @param comp the component.
*/
public void addLayoutComponent(final String name, final Component comp) {
// not used
}
/**
* Not used.
*
* @param name the component name.
* @param comp the component.
*/
public void removeLayoutComponent(final String name, final Component comp) {
// not used
}
/**
* Sets the sizes attribute of the RadialLayout object.
*
* @param parent the parent.
*
* @see LayoutManager
*/
private void setSizes(final Container parent) {
final int nComps = parent.getComponentCount();
//Reset preferred/minimum width and height.
this.preferredWidth = 0;
this.preferredHeight = 0;
this.minWidth = 0;
this.minHeight = 0;
for (int i = 0; i < nComps; i++) {
final Component c = parent.getComponent(i);
if (c.isVisible()) {
final Dimension d = c.getPreferredSize();
if (this.maxCompWidth < d.width) {
this.maxCompWidth = d.width;
}
if (this.maxCompHeight < d.height) {
this.maxCompHeight = d.height;
}
this.preferredWidth += d.width;
this.preferredHeight += d.height;
}
}
this.preferredWidth = this.preferredWidth / 2;
this.preferredHeight = this.preferredHeight / 2;
this.minWidth = this.preferredWidth;
this.minHeight = this.preferredHeight;
}
/**
* Returns the preferred size.
*
* @param parent the parent.
*
* @return The preferred size.
* @see LayoutManager
*/
public Dimension preferredLayoutSize(final Container parent) {
final Dimension dim = new Dimension(0, 0);
setSizes(parent);
//Always add the container's insets!
final Insets insets = parent.getInsets();
dim.width = this.preferredWidth + insets.left + insets.right;
dim.height = this.preferredHeight + insets.top + insets.bottom;
this.sizeUnknown = false;
return dim;
}
/**
* Returns the minimum size.
*
* @param parent the parent.
*
* @return The minimum size.
* @see LayoutManager
*/
public Dimension minimumLayoutSize(final Container parent) {
final Dimension dim = new Dimension(0, 0);
//Always add the container's insets!
final Insets insets = parent.getInsets();
dim.width = this.minWidth + insets.left + insets.right;
dim.height = this.minHeight + insets.top + insets.bottom;
this.sizeUnknown = false;
return dim;
}
/**
* This is called when the panel is first displayed, and every time its size
* changes.
* Note: You CAN'T assume preferredLayoutSize or minimumLayoutSize will be
* called -- in the case of applets, at least, they probably won't be.
*
* @param parent the parent.
* @see LayoutManager
*/
public void layoutContainer(final Container parent) {
final Insets insets = parent.getInsets();
final int maxWidth = parent.getSize().width
- (insets.left + insets.right);
final int maxHeight = parent.getSize().height
- (insets.top + insets.bottom);
final int nComps = parent.getComponentCount();
int x = 0;
int y = 0;
// Go through the components' sizes, if neither preferredLayoutSize nor
// minimumLayoutSize has been called.
if (this.sizeUnknown) {
setSizes(parent);
}
if (nComps < 2) {
final Component c = parent.getComponent(0);
if (c.isVisible()) {
final Dimension d = c.getPreferredSize();
c.setBounds(x, y, d.width, d.height);
}
}
else {
double radialCurrent = Math.toRadians(90);
final double radialIncrement = 2 * Math.PI / nComps;
final int midX = maxWidth / 2;
final int midY = maxHeight / 2;
final int a = midX - this.maxCompWidth;
final int b = midY - this.maxCompHeight;
for (int i = 0; i < nComps; i++) {
final Component c = parent.getComponent(i);
if (c.isVisible()) {
final Dimension d = c.getPreferredSize();
x = (int) (midX
- (a * Math.cos(radialCurrent))
- (d.getWidth() / 2)
+ insets.left);
y = (int) (midY
- (b * Math.sin(radialCurrent))
- (d.getHeight() / 2)
+ insets.top);
// Set the component's size and position.
c.setBounds(x, y, d.width, d.height);
}
radialCurrent += radialIncrement;
}
}
}
/**
* Returns the class name.
*
* @return The class name.
*/
public String toString() {
return getClass().getName();
}
/**
* Run a demonstration.
*
* @param args ignored.
*
* @throws Exception when an error occurs.
*/
public static void main(final String[] args) throws Exception {
final Frame frame = new Frame();
final Panel panel = new Panel();
panel.setLayout(new RadialLayout());
panel.add(new Checkbox("One"));
panel.add(new Checkbox("Two"));
panel.add(new Checkbox("Three"));
panel.add(new Checkbox("Four"));
panel.add(new Checkbox("Five"));
panel.add(new Checkbox("One"));
panel.add(new Checkbox("Two"));
panel.add(new Checkbox("Three"));
panel.add(new Checkbox("Four"));
panel.add(new Checkbox("Five"));
frame.add(panel);
frame.setSize(300, 500);
frame.setVisible(true);
}
}
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