Displaying float numbers in a graph

Question

Good afternoon!
I need to dislay my output results from the loop into graph. My results are all float numbers, so I cannot use drawLine. Please help if you can. I would really appreciate it.
Sincerely,
Byryndyk

Answer 1

Correction: yOrigin in post 6 is accurate for min < 0.
This works better . . .
import java.awt.*;
import java.awt.geom.*;
import java.util.*;
import javax.swing.*;
public class PlottingFloats {
  static class Plotter extends JPanel {
    float PAD = 25;
    java.util.List dataList = new ArrayList();
    public Plotter() {
      setBackground(Color.white);
      setPreferredSize(new Dimension(400,300));
    public void paintComponent(Graphics g) {
      super.paintComponent(g);
      Graphics2D g2 = (Graphics2D)g;
      float width = getWidth();
      float height = getHeight();
      float xStep = (width - 2*PAD)/(dataList.size() - 1);
      float x = PAD;
      float y;
      // scale data
      float max = ((Float)Collections.max(dataList)).floatValue();
      float min = ((Float)Collections.min(dataList)).floatValue();
      float vertSpace = height - 2*PAD;
      float yOffset = height - PAD;
      float scale = vertSpace/(max - min);
      float yOrigin = vertSpace * max/(max - (min > 0 ? 0 : min)) + PAD;
      // draw ordinate
      g2.draw(new Line2D.Float(PAD, PAD, PAD, yOffset));
      // draw abcissa
      g2.draw(new Line2D.Float(PAD, yOrigin, width - PAD, yOrigin));
      // label ordinate limits
      g2.drawString(String.valueOf(max), 10, PAD - 10);
      g2.drawString(String.valueOf(min), 10, yOffset + PAD/2);
      g2.setStroke(new BasicStroke(4f));
      g2.setPaint(Color.red);
      for(int j = 0; j < dataList.size(); j++) {
        y = yOrigin - scale * ((Float)dataList.get(j)).floatValue();
        g2.draw(new Line2D.Float(x, y, x, y));
        x += xStep;
    protected void plot(float input) {
      dataList.add(new Float(input));
      repaint();
  public static void main(String[] args) {
    float[] data = {
      100f, 220f, 12.9f, 65f, 47.3f, 15f, 190f, -18f
    Plotter plotter = new Plotter();
    for(int j = 0; j < 8; j++)
      plotter.plot(data[j]);
    JFrame f = new JFrame("Plotting Floats");
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.getContentPane().add(plotter);
    f.pack();
    f.setLocationRelativeTo(null);
    f.setVisible(true);
}