import javax.swing.JComponent;
import java.awt.*;
 
public class Sablier extends JComponent 
{
    public Sablier() 
    {
        super();
    }

    @Override
    protected void paintComponent(Graphics pinceau) 
    {
        Graphics secondPinceau = pinceau.create();
        if (this.isOpaque()) 
        {
            secondPinceau.setColor(this.getBackground());
            secondPinceau.fillRect(0, 0, this.getWidth(), this.getHeight());
        }

        Polygon poly1 = new Polygon();
        poly1.addPoint(0, 0);
        poly1.addPoint(this.getWidth(), 0);
        poly1.addPoint(this.getWidth()/2, this.getHeight()/2);
        Polygon poly2 = new Polygon();
        poly2.addPoint(0, this.getHeight());
        poly2.addPoint(this.getWidth(), this.getHeight());
        poly2.addPoint(this.getWidth()/2, this.getHeight()/2);

        secondPinceau.setColor(Color.CYAN);
        secondPinceau.fillPolygon(poly1);
        secondPinceau.fillPolygon(poly2);
    }
}