SwingWorker gui repaint - swing

Question

Im trying to use the SwingWorker to update my gui without calling repaint().
I want the SwigWorker to update the status of each GridGraphic[i][j] and the have the gui be repsonsive to the changes without calling repaint().
GridGraphic.java
import java.awt.*;
import javax.swing.*;
public class GridGraphic extends JComponent {
private int intensity = 0;
public GridGraphic() {
//setBorder(BorderFactory.createLineBorder(Color.BLUE));
}
public void paintComponent(Graphics g) {
//paints the GridGraphic black
if (intensity == 0){
super.paintComponent(g);
g.setColor(Color.BLACK);
g.fillRect(0, 0, getWidth(), getHeight());
}
//paints the GridGraphic black with a yellow dot
else if (intensity == 5){
super.paintComponent(g);
g.setColor(Color.BLACK);
g.fillRect(0, 0, getWidth(), getHeight());
g.setColor(Color.YELLOW);
g.fillOval(3, 3, getWidth()/2, getHeight()/2);
}
}
public Dimension getPreferredSize() {
return new Dimension(10, 10);
}
public void setAgent(){
intensity = 5;
}
public void setDefault(){
intensity = 0;
}
public int getIntensity(){
return intensity;
}
}