rg4

import java.awt.Graphics;

public class Arrow implements BasicPainter {

    @Override
    public void paint(Graphics g, int x, int y, int width, int height, boolean fill) {
        int[] xovi = {x, (x + width / 2), (x + width / 2), x + width, (x + width / 2), (x + width / 2), x};
        int[] yoni = {y, y, (y - height / 4), (y + height / 4), (y + 3 * height / 4), (y + height / 2), (y + height / 2)};
        if (fill)
            g.fillPolygon(xovi,yoni,7);
        else
            g.drawPolygon(xovi,yoni,7);

    }

}

import java.awt.Graphics;

public class Circle implements BasicPainter {
    @Override
    public void paint(Graphics g, int x, int y, int width, int height, boolean fill) {
        if (!fill)
            g.drawOval(x, y, width, height);
        else
            g.fillOval(x, y, width, height);
    }
}

import java.awt.Graphics;

public class Triangle implements BasicPainter {

    @Override
    public void paint(Graphics g, int x, int y, int width, int height, boolean fill) {
        if (!fill) {
            g.drawLine(x, y, x + (width / 2), y + height);
            g.drawLine(x + (width / 2), y + height, x - (width / 2), y + height);
            g.drawLine(x - (width / 2), y + height, x, y);
        } else {
            int[] xovi = {x, x + (width / 2), x - (width / 2)};
            int[] yoni = {y, y + height, y + height};
            g.fillPolygon(xovi, yoni, 3);
        }
    }

}