Class for drawing graphs??

Question

hello out there,
is there a class in java how is able to draw graphs (like f(x)=x^2)??
thanks for your help

Answer 1

import java.awt.*;
import java.awt.geom.*;
import javax.swing.*;
public class GraphingTest
    public static void main(String[] args)
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.getContentPane().add(new GraphingTestPanel());
        f.setSize(400,400);
        f.setLocation(200,200);
        f.setVisible(true);
class GraphingTestPanel extends JPanel
    final int PAD;
    public GraphingTestPanel()
        PAD = 20;
        setBackground(Color.white);
    protected void paintComponent(Graphics g)
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D)g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                            RenderingHints.VALUE_ANTIALIAS_ON);
        double w = getWidth();
        double h = getHeight();
        double yInc = (h - 2*PAD)/20.0;
        double xInc = (w - 2*PAD)/20.0;
        // ordinate
        g2.draw(new Line2D.Double(w/2, PAD, w/2, h - PAD));
        // tick marks and labels
        double x = w/2, y = PAD;
        for(int i = 0; i <= 20; i++)
            g2.draw(new Line2D.Double(x - 2, y, x + 2, y));
            if(i % 5 == 0 && i != 10)
                g2.drawString(String.valueOf(10 - i), (int)(x + 5), (int)(y + 4));
            y += yInc;
        // abcissa
        g2.draw(new Line2D.Double(PAD, h/2, w - PAD, h/2));
        // tick marks and labels
        x = PAD; y = h/2;
        for(int i = 0; i <= 20; i++)
            g2.draw(new Line2D.Double(x, y - 2, x, y + 2));
            if(i % 5 == 0 && i != 10)
                g2.drawString(String.valueOf(i - 10), (int)(x - 9), (int)(y + 12));
            x += xInc;
        // plot function y = x^2;
        g2.setPaint(Color.red);
        for(int i = -10; i <=10; i++)
            double square = i * i * yInc;
            //double linear = i * yInc;
            //double constant = /*constant ==*/ 3 * yInc;
            //y = h/2 - (square + linear + constant);
            y = h/2 - square;
            x = w/2 + i * xInc;
            g2.fill(new Ellipse2D.Double(x - 2, y - 2, 4, 4));
}