Making Scatter Plot Graphs in Java

[Snuffles]

Hello CodeCall,

I'm trying to find a way to make a simple scatter plot in Java. I've Googled around and found lots of things like jgraph and jchart which all claim to be able to do what I want, but the stuff they are doing is a bit too far over my head for me to be able to use them.

I was hoping someone could give me a starter code for one of these to make my aforementioned scatter plot. I have the data i want to graph saved in an ArrayList, and I just want to graph the ArrayList index on the x and the value on the y.

I searched the forums for this but didn't find anything that quite got me what I needed.

Anyways, thanks in advance.

Regards,
~Snuffles

[WingedPanther]

It sounds like you just need a drawing space and to plot some points on it. (no, I don't know the details of how to do that... yet)

[Snuffles]

Ok I actually found something for it, from more intense googling.

heres the code if you want it, comes with axis lines and labels (made by myself i might add, jsut the getting it on a graph part was taken from somewhere else)

import javax.swing.*;
import java.awt.geom.*;
import java.awt.Graphics;
import java.util.*;

public class Scatterplot extends JFrame {

    private List points = new ArrayList();

    public Scatterplot() {
        super("Scatterplot");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        //adding points
        for(int a = 0; a < c.myList.size(); a++)
        {
            points.add(new Point2D.Float(a, c.myList.get(a).getSteps()));
        }
        //end adding points
        
        
        JPanel panel = new JPanel() { 
            public void paintComponent(Graphics g) {
                for(Iterator i=points.iterator(); i.hasNext(); ) {
                    Point2D.Float pt = (Point2D.Float)i.next();
                    g.drawString("*", (int)(pt.x)+40, 
                        (int)(-pt.y+getHeight())- 40);
                }
                int width = getWidth();
                int height = getHeight();
                setVisible(true);
                //axises (axes?)
                g.drawLine(0, height - 40, width, height-40);
                g.drawLine(40, height - 270, 40, height);
                
                //y-axis labels below
                for (int a = 1; a < 5; a++)
                {
                    String temp = 20*a + "--";
                    g.drawString(temp, 20, height - (36 + 20*(a)));
                }
                for (int a = 5; a < 11; a++)
                {
                    String temp = 20*a + "--";
                    g.drawString(temp, 11, height - (36 + 20*(a)));
                }
                //y-axis labels above
                
                //x-axis labels below
                for (int a = 1; a < 21; a++)
                {
                    g.drawString("|", 40 + 50*a, height - 30);
                    int x = 50*a;
                    String temp = x + " ";
                    g.drawString(temp, 30 + 50*a, height - 18);
                }
                g.drawString("The Collatz Conjecture: Number vs. Stopping Time", 400, 60);
                //x-axis labels above

            }
        };

        setContentPane(panel);
        //last two numbers below change the initial size of the graph.
        setBounds(20, 20, 1100, 400);
        setVisible(true);       
    }
}