Calculations of Profits/Hr - Pug Tutorials

import java.awt.Graphics2D;
import java.text.DecimalFormat;
import java.util.concurrent.TimeUnit;

import org.osbot.rs07.script.Script;
import org.osbot.rs07.script.ScriptManifest;


@ScriptManifest(name="ExampleScript", author="author", info="1.0", logo="", version=1.0D)
public final class paintScript
  extends Script
{

	// PAINT VARIABLE DECLARATIONS
	private long timeRan;
  	private long timeBegan;

	private int costOfItem;
	private int itemsMade;
	private double gpGained;
	private double totalGpGained;

	private int gpPerHour;
	private int totalGpPerHour;

	// ONSTART() METHOD
	public final void onStart()
	{
		timeBegan = System.currentTimeMillis();
		costOfItem = 500;
	}

	// ONLOOP() METHOD
	@Override
	public int onLoop() throws InterruptedException
	{
		itemsMade += 1;
		return 123;
	}

	// ONPAINT() METHOD
	public void onPaint(Graphics2D g)
	  {
	    Graphics2D gr = g;
	    timeRan = System.currentTimeMillis() - timeBegan;
	    gpGained = itemsMade - costOfItem;
	    gpPerHour = (int)(gpGained / ((System.currentTimeMillis() - this.timeBegan) / 3600000.0D));
	    totalGpPerHour = gpPerHour / 1000;
	    DecimalFormat df = new DecimalFormat("#");
	    g.drawString(ft(timeRan), 295, 349);
	    g.drawString("" + df.format(totalGpPerHour) + " k", 295, 417);
	  }

	private String ft(long duration)
	{
		String res = "";
		long days = TimeUnit.MILLISECONDS.toDays(duration);
		long hours = TimeUnit.MILLISECONDS.toHours(duration)
		- TimeUnit.DAYS.toHours(TimeUnit.MILLISECONDS.toDays(duration));
		long minutes = TimeUnit.MILLISECONDS.toMinutes(duration)
		- TimeUnit.HOURS.toMinutes(TimeUnit.MILLISECONDS
		.toHours(duration));
		long seconds = TimeUnit.MILLISECONDS.toSeconds(duration)
		- TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS
		.toMinutes(duration));
		if (days == 0) {
		res = (hours + ":" + minutes + ":" + seconds);
		} else {
		res = (days + ":" + hours + ":" + minutes + ":" + seconds);
		}
		return res;
	}

}