I am trying to change paint as my appplet does some computationns (please see the code below) so that when I use repaint, I paint something new. How is this done in java?

Thank you very much!

package com.guilherme.main;

import javax.swing.JApplet;
import java.lang.Math;
import com.guilherme.investorRelated.VectorOfInvestors;
import com.guilherme.marketRelated.StockMarket;
import java.awt.Graphics;

public class RunnerApplet extends JApplet{

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	
	public void init()
	{this.resize(500,500);

	}
	
	public void start()
	{
		for (int i=0; i<2; i++)
//SOMETHING SHOULD BE CHANGING stockHistoryAux HERE
		{repaint(); } 
	   
	}
	
	public void stop()
	{}
	
	public void paint(Graphics grafo) 
	
{
		 int[] Ycoordinates = stockHistoryAux;
		int[] Xcoordinates = {10,20,30,40,50,60,70,80,90,100};
	 grafo.drawPolyline(Xcoordinates,Ycoordinates,i); 

	}
}
}

*edit: Modified your code tags so they would work. Thanks for using them.

This post has been edited by Martyr2: 18 Mar, 2008 - 12:35 PM

The paint event can be a peculiar event in that it pretty much responds to the environment of the program. So to manipulate it you just need to manipulate the environment a little. What I mean by that is for you do something like make stockHistoryAux a variable of the program where you adjust its value using your loop in start() but then when you call repaint you read the value of stockHistoryAux to determine its course of action. paint() can see the variables out there in a higher scope, so if you can have your functions manipulate these variables and call a repaint, the paint function will use the current values to do its job.

So if in start() you want to store different y coordinates in the array (I am assuming it is an array of integers here based on your usage of it so far) then you would move it to be of a greater scope (like a variable of the class) and alter each of its elements. Then call repaint to have the paint() event read the current values of the array and draw accordingly.

Hopefully that makes sense to you.