import gpdraw.*;

public class ParallelLinesRChangPeriod4 {
		private DrawingTool pen;
		private SketchPad pad;

	public ParallelLinesRChangPeriod4() {
        pad = new SketchPad(500, 500);
        pen = new DrawingTool(pad);
    }

	public void draw(int a) {
		for (int row = 0; row < 8; row++){
			//moves to the other square
			pen.up();
			pen.move(-400 + a/2,400 - a/2);
			pen.down();
			//changes a so that it wont be in the same spot all the time
			a /=3;
  // calculate the start of the row of squares
  // calculate and add a horizontal offset

		  for (int col = 0; col < 7; col++){
		  	pen.fillRect(a,a);
		  // draw the square
		  // calculate and position for the next square
		  }
	pen.up();
	pen.move(-400- a/2,400 - a/2);
	pen.down();
	pen.setDirection(0);
	pen.forward(500);
  // calculate the location and draw the line
}
	}
    public static void main(String[] args) {
    	ParallelLinesRChangPeriod4 bob = new ParallelLinesRChangPeriod4();
    	bob.draw(40);
    }


}