MultiSquareSpiral.java

public class MultiSquareSpiral {

  public static void main(String[] args) {
    Turtle dan = new Turtle();

    dan.penup();
    dan.backward(400);
    dan.pendown();
    multiSquare(dan, 20, 5);

    dan.penup();
    dan.forward(150);
    dan.pendown();
    multiSquare2(dan, 20, 5);

    dan.penup();
    dan.forward(250);
    dan.pendown();
    concentricSquares(dan, 20, 5);

    dan.penup();
    dan.forward(250);
    dan.pendown();
    squareSpiral(dan, 10, 20);
  }

  public static void square(Turtle t, double x) {
    for (int i = 0; i < 4; i++) {
      t.forward(x);
      t.left(90);
    }
  }

  public static void multiSquare(Turtle t, double base, int numSquares) {
    for (int i = 0; i < numSquares; i++) {
      //draws a square that grows
      square(t, (i + 1) * base);
    }
  }


  public static void multiSquare2(Turtle t, double base, int numSquares) {
    for (int i = 1; i <= numSquares; i++) {
      square(t, i * base);
    }
  }


  public static void concentricSquares(Turtle t, double base, int numSquares) {
    for (int i = 0; i < numSquares; i++) {
      square(t, (2 * i + 1) * base);
      t.penup();
      t.backward(base);
      t.right(90);
      t.forward(base);
      t.left(90);
      t.pendown();
    }
    t.penup();
    t.forward(numSquares * base);
    t.left(90);
    t.forward(numSquares * base);
    t.right(90);
    t.pendown();
  }


  public static void squareSpiral(Turtle t, double base, int numSides) {
    for (int i = 0; i < numSides; i++) {
      t.forward((i + 1) * base);
      t.left(90);
    }
    for (int i = numSides; i > 0; i--){
      t.right(90);
      t.backward(i * base);
    }
  }

}