ConcentricLoop.java

package org.teachingkidsprogramming.recipes.completed.section03ifs;

import org.teachingextensions.logo.Tortoise;

public class ConcentricLoop
{
  public static void main(String[] args)
  {
    Tortoise.show();
    //  Set the tortoise x position to 150 --#4.1
    Tortoise.setX(150);
    //  Set the tortoise y position to 200 --#4.2
    Tortoise.setY(200);
    //  Set the tortoise speed to 10  --#4.3
    Tortoise.setSpeed(10);
    //  Do the following 360 times --#3.1
    for (int i = 0; i < 360; i++)
    {
      //    Move the tortoise 3 pixels --#1
      Tortoise.move(3);
      //    Turn the tortoise 1 degree --#2
      Tortoise.turn(1);
      //    If i is divisible by 20 --(HINT: Use mod operator '%') --#7
      if (i % 20 == 0)
      {
        //  Do the following 360 times --#8.1
        for (int j = 0; j < 360; j++)
        {
          //   Move the tortoise 1 pixel  --#5  
          Tortoise.move(1);
          //   Turn the tortoise 1 degree --#6    
          Tortoise.turn(1);
          //   Change the width of the line that the tortoise draws to 1/100th of the current line --#9      
          Tortoise.setPenWidth(j / 100);
          //   End Repeat --#8.2
        }
      }
      //   End Repeat --#3.2
    }
  }
}