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ImageJ is an open source Java image processing program inspired by NIH Image for the Macintosh.
There is a newer version: 1.54m
package ij.plugin.frame;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.io.*;
import java.awt.datatransfer.*;	
import ij.*;
import ij.plugin.PlugIn;
import ij.plugin.frame.*;
import ij.text.*;
import ij.gui.*;
import ij.util.*;
import ij.io.*;
import ij.process.*;
import ij.measure.*;

/** ImageJ plugin that does curve fitting using the modified CurveFitter class.
 *  Includes simplex settings dialog option.
 *
 * @author  Kieran Holland (email: [email protected])
 *
 * 2013-10-01: fit not in EventQueue, setStatusAndEsc, error if nonnumeric data
 */
public class Fitter extends PlugInFrame implements PlugIn, ItemListener, ActionListener, KeyListener, ClipboardOwner {

	Choice fit;
	Button doIt, open, apply;
	Checkbox settings;
	String fitTypeStr = CurveFitter.fitList[0];
	TextArea textArea;

	double[] dx = {0,1,2,3,4,5};
	double[] dy = {0,.9,4.5,8,18,24};
	double[] x,y;

	static CurveFitter cf;
	static int fitType = -1;
	static String equation = "y = a + b*x + c*x*x";
	static final int USER_DEFINED = -1;

	public Fitter() {
		super("Curve Fitter");
		WindowManager.addWindow(this);
		addKeyListener(this);
		Panel panel = new Panel();
		fit = new Choice();
		for (int i=0; i1000)
			npoints = 1000;
		double[] a = Tools.getMinMax(x);
		double xmin=a[0], xmax=a[1];
		if (eightBitCalibrationPlot) {
			npoints = 256;
			xmin = 0;
			xmax = 255;
		}
		a = Tools.getMinMax(y);
		double ymin=a[0], ymax=a[1]; //y range of data points
		float[] px = new float[npoints];
		float[] py = new float[npoints];
		double inc = (xmax-xmin)/(npoints-1);
		double tmp = xmin;
		for (int i=0; i100))
					break;
				textArea.append(s+"\n");
			}
			r.close();
		}
		catch (Exception e) {
			IJ.error(e.getMessage());
			return;
		}
	}
	
	public void itemStateChanged(ItemEvent e) {
		fitTypeStr = fit.getSelectedItem();
	}
	
	public void actionPerformed(ActionEvent e) {
		if (e.getSource() instanceof MenuItem) {
			String cmd = e.getActionCommand();
			if (cmd==null) return;
			if (cmd.equals("Cut"))
				cut();
			else if (cmd.equals("Copy"))
				copy();
			else if (cmd.equals("Paste"))
				paste();
			return;
		}
		try {
            if (e.getSource()==doIt) {
                final int fitType = CurveFitter.getFitCode(fit.getSelectedItem());
	            Thread thread = new Thread(
	                new Runnable() {
                        final public void run() {
                            doFit(fitType);
                        }
                    }, "CurveFitting"
                );
                thread.setPriority(Thread.currentThread().getPriority());
                thread.start();
            } else if (e.getSource()==apply)
                applyFunction();
            else
                open();
		} catch (Exception ex) {IJ.log(""+ex);}
	}
	
	String zapGremlins(String text) {
		char[] chars = new char[text.length()];
		chars = text.toCharArray();
		int count=0;
		for (int i=0; i127)) {
				count++;
				chars[i] = ' ';
			}
		}
		if (count>0)
			return new String(chars);
		else
			return text;
	}

    public void keyTyped (KeyEvent e) {}
    public void keyReleased (KeyEvent e) {}
    public void keyPressed (KeyEvent e) {
        if (e.getKeyCode() == KeyEvent.VK_ESCAPE)
            IJ.getInstance().keyPressed(e);
    }
    
	private boolean copy() { 
		String s = textArea.getSelectedText();
		Clipboard clip = getToolkit().getSystemClipboard();
		if (clip!=null) {
			StringSelection cont = new StringSelection(s);
			clip.setContents(cont,this);
			return true;
		} else
			return false;
	}
 
	  
	private void cut() {
		if (copy()) {
			int start = textArea.getSelectionStart();
			int end = textArea.getSelectionEnd();
			textArea.replaceRange("", start, end);
		}	
	}

	private void paste() {
		String s;
		s = textArea.getSelectedText();
		Clipboard clipboard = getToolkit( ). getSystemClipboard(); 
		Transferable clipData = clipboard.getContents(s);
		try {
			s = (String)(clipData.getTransferData(DataFlavor.stringFlavor));
		} catch  (Exception e)  {
			s  = e.toString( );
		}
		int start = textArea.getSelectionStart( );
		int end = textArea.getSelectionEnd( );
		textArea.replaceRange(s, start, end);
		if (IJ.isMacOSX())
			textArea.setCaretPosition(start+s.length());
    }
    
	public void lostOwnership (Clipboard clip, Transferable cont) {}

}