KanizsaSquare.java
/* 
 * program to paint a kanizsa square 
 */

package npw;

import java.awt.Color;
import javax.swing.SwingUtilities;
import painter.SPainter;
import shapes.SCircle;
import shapes.SSquare;

public class KanizsaSquare {

    // THE SOLUTION TO THE BLUE DOT PROBLEM

    private void paintTheImage() {
        SPainter guy = new SPainter("Kanizsa Square",400,400);

        SCircle dot = new SCircle(75);
        paintBlueCircle(guy, dot);
        paintRedCircle(guy, dot);
        paintGreenCircles(guy, dot);

        SSquare square = new SSquare(200);
        paintWhiteSquare(guy, square);
    }

    private void paintWhiteSquare(SPainter guy, SSquare square) {
        guy.setColor(Color.white);
        guy.paint(square);
    }

    private void paintGreenCircles(SPainter guy, SCircle dot) {
        //top right green circle
        guy.mbk(100);
        guy.mlt(100);
        guy.setColor(Color.green);
        guy.paint(dot);
        guy.moveToCenter();
        //bottom left green circle
        guy.mfd(100);
        guy.mrt(100);
        guy.paint(dot);
        guy.moveToCenter();
    }

    private void paintRedCircle(SPainter guy, SCircle dot) {
        guy.mfd(100);
        guy.mlt(100);
        guy.setColor(Color.RED);
        guy.paint(dot);
        guy.moveToCenter();
    }

    private void paintBlueCircle(SPainter guy, SCircle dot) {
        guy.mbk(100);
        guy.mrt(100);
        guy.setColor(Color.blue);
        guy.paint(dot);
        guy.moveToCenter();
    }

//REQUIRED INFASTRUCTURE

    public KanizsaSquare() {
        paintTheImage();
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                new KanizsaSquare();
            }
        });}
}