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//******************************************************************************
//
// File: Axis.java
// Package: edu.rit.numeric.plot.impl
// Unit: Class edu.rit.numeric.plot.impl.Axis
//
// This Java source file is copyright (C) 2007 by Alan Kaminsky. All rights
// reserved. For further information, contact the author, Alan Kaminsky, at
// ark@cs.rit.edu.
//
// This Java source file is part of the Parallel Java Library ("PJ"). PJ is free
// software; you can redistribute it and/or modify it under the terms of the GNU
// General Public License as published by the Free Software Foundation; either
// version 3 of the License, or (at your option) any later version.
//
// PJ 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 for more details.
//
// Linking this library statically or dynamically with other modules is making a
// combined work based on this library. Thus, the terms and conditions of the
// GNU General Public License cover the whole combination.
//
// As a special exception, the copyright holders of this library give you
// permission to link this library with independent modules to produce an
// executable, regardless of the license terms of these independent modules, and
// to copy and distribute the resulting executable under terms of your choice,
// provided that you also meet, for each linked independent module, the terms
// and conditions of the license of that module. An independent module is a
// module which is not derived from or based on this library. If you modify this
// library, you may extend this exception to your version of the library, but
// you are not obligated to do so. If you do not wish to do so, delete this
// exception statement from your version.
//
// A copy of the GNU General Public License is provided in the file gpl.txt. You
// may also obtain a copy of the GNU General Public License on the World Wide
// Web at http://www.gnu.org/licenses/gpl.html.
//
//******************************************************************************
package edu.rit.numeric.plot.impl;
import edu.rit.numeric.plot.Strokes;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Stroke;
import java.awt.geom.Rectangle2D;
/**
* Class Axis is the abstract base class for an axis on a plot. It also provides
* static methods to help determine the scale for an axis.
*
* @author Alan Kaminsky
* @version 11-Jun-2007
*/
public abstract class Axis
{
// Exported constants.
/**
* The default axis stroke (solid, width=1).
*/
public static final Stroke DEFAULT_STROKE = Strokes.solid (1);
/**
* The default axis paint (black).
*/
public static final Paint DEFAULT_PAINT = Color.black;
// Hidden data members.
/**
* Length of this axis on the display.
*/
protected double myLength;
/**
* Stroke for drawing this axis on the display.
*/
protected Stroke myStroke;
/**
* Paint for drawing this axis on the display.
*/
protected Paint myPaint;
// Hidden constructors.
/**
* Construct a new axis. The axis is drawn with the given length, stroke,
* and paint.
*
* @param theLength
* Length of this axis on the display.
* @param theStroke
* Stroke for drawing this axis on the display.
* @param thePaint
* Paint for drawing this axis on the display.
*
* @exception NullPointerException
* (unchecked exception) Thrown if <TT>theStroke</TT> is null or
* <TT>thePaint</TT> is null.
* @exception IllegalArgumentException
* (unchecked exception) Thrown if <TT>theLength</TT> is less than or
* equal to 0.
*/
protected Axis
(double theLength,
Stroke theStroke,
Paint thePaint)
{
if (theStroke == null || thePaint == null)
{
throw new NullPointerException();
}
if (theLength <= 0.0)
{
throw new IllegalArgumentException();
}
myLength = theLength;
myStroke = theStroke;
myPaint = thePaint;
}
// Exported operations.
/**
* Returns the length of this axis on the display.
*/
public double getLength()
{
return myLength;
}
/**
* Returns the stroke for drawing this axis on the display.
*/
public Stroke getStroke()
{
return myStroke;
}
/**
* Returns the paint for drawing this axis on the display.
*/
public Paint getPaint()
{
return myPaint;
}
/**
* Draw this axis in the given graphics context starting at coordinates (0,
* 0) and moving horizontally to the right.
*
* @param g2d 2-D graphics context.
*/
public abstract void drawHorizontal
(Graphics2D g2d);
/**
* Draw this axis in the given graphics context starting at coordinates (0,
* 0) and moving vertically up.
*
* @param g2d 2-D graphics context.
*/
public abstract void drawVertical
(Graphics2D g2d);
}
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