Java Square Spiral

Java program to generate square spiral.

Note that spiral size should be uneven number in order to generate it properly.

Main.java

import javax.imageio.ImageIO;
import java.io.File;

// 2018 TheFlyingKeyboard and released under MIT License 
// theflyingkeyboard.net
public class Main {
    public static void main(String[] args) {
        SquareSpiral sierpinskiTriangle = new SquareSpiral();

        try {
            ImageIO.write(sierpinskiTriangle.generate(15), "png", new File("SquareSpiral.png"));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

SquareSpiral.java

import java.awt.*;
import java.awt.image.BufferedImage;

// 2018 TheFlyingKeyboard and released under MIT License
// theflyingkeyboard.net
public class SquareSpiral {
    private final Color foregroundColor;
    private final Color backgroundColor;

    public SquareSpiral() {
        this.foregroundColor = Color.BLACK;
        this.backgroundColor = Color.WHITE;
    }

    public SquareSpiral(final Color foregroundColor, final Color backgroundColor) {
        this.foregroundColor = foregroundColor;
        this.backgroundColor = backgroundColor;
    }

    public BufferedImage generate(final int spiralSize){
        BufferedImage bufferedImage = new BufferedImage(spiralSize, spiralSize, BufferedImage.TYPE_INT_RGB);
        Graphics2D graphics2D = bufferedImage.createGraphics();

        graphics2D.setColor(backgroundColor);
        graphics2D.fillRect(0 ,0, spiralSize, spiralSize);

        graphics2D.setColor(foregroundColor);

        int x = spiralSize / 2;
        int y = spiralSize / 2;
        int length = 1;
        int counter = 0;

        while(x >= 0 && y >= 0 && x < spiralSize && y < spiralSize){
            switch (counter) {
                case 0:
                    graphics2D.drawLine(x, y, x + length, y);

                    x += length;
                    break;
                case 1:
                    graphics2D.drawLine(x, y, x, y + length);

                    y += length;
                    break;
                case 2:
                    graphics2D.drawLine(x, y, x - length, y);

                    x -= length;
                    break;
                case 3:
                    graphics2D.drawLine(x, y, x, y - length);
                    y -= length;

                    counter = -1;
                    break;
            }

            ++counter;
            ++length;
        }

        return bufferedImage;
    }
}