KanizsaSquare.java
package npw;
import painter.SPainter;
import shapes.SCircle;
import shapes.SSquare;

import javax.swing.*;
import java.awt.*;

public class KanizsaSquare {
    // THE SOLUTION TO THE BLUE DOT PROBLEM
    private void paintTheImage() {
        SPainter painter = new SPainter("Kanizsa Square",400,400);
        SSquare square = new SSquare(200);
        SCircle dot = new SCircle(50);

        drawBlackSqauare(painter, square);
        paintBlueCircle(painter, dot);
        paintGreenCircles(painter, dot);
        paintWhiteSquare(painter, square);


    }

    private void drawBlackSqauare(SPainter painter, SSquare square) {
        painter.tl(45);
        painter.setColor(Color.BLACK);
        painter.draw(square);

    }
    private void paintBlueCircle(SPainter painter, SCircle dot) {
        painter.tr(45);
        painter.mlt(100);
        painter.mfd(100);
        painter.setColor(Color.BLUE);
        painter.paint(dot);

        painter.mbk(200);
        painter.mrt(200);
        painter.paint(dot);
    }

    private void paintGreenCircles(SPainter painter, SCircle dot) {

        painter.mlt(200);
        painter.setColor(Color.GREEN);
        painter.paint(dot);
        painter.mfd(200);
        painter.mrt(200);
        painter.paint(dot);
    }

    private void paintWhiteSquare(SPainter painter, SSquare square) {
        painter.mlt(100);
        painter.mbk(100);
        painter.setColor(Color.WHITE);
        painter.paint(square);
    }

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