Turtle.java in programe

Turtle.java

import java.awt.Color;

 public class Turtle

{

    private double x, y;   

    private double angle;

             public Turtle(double x0, double y0, double a0)

            {

        x = x0;

        y = y0;

        angle = a0;

    }

    public void turnLeft(double delta)

    {

        angle += delta;

    }

     public void goForward(double step)

    {

        double oldx = x;

        double oldy = y;

        x += step * Math.cos(Math.toRadians(angle));

        y += step * Math.sin(Math.toRadians(angle));

        StdDraw.line(oldx, oldy, x, y);

     }

                 public void pause(int t)

                 {

        StdDraw.show(t);

    }

                public void setPenColor(Color color)

                 {

        StdDraw.setPenColor(color);

    }

    public void setPenRadius(double radius)

   {

        StdDraw.setPenRadius(radius);

    }

    public void setCanvasSize(int width, int height)

    {

        StdDraw.setCanvasSize(width, height);

    }

    public void setXscale(double min, double max)

    {

        StdDraw.setXscale(min, max);

    }

    public void setYscale(double min, double max)

   {

        StdDraw.setYscale(min, max);

    }

                 public static void main(String[] args)

                 {

        double x0 = 0.5;

        double y0 = 0.0;

        double a0 = 60.0;

        double step = Math.sqrt(3)/2;

        Turtle turtle  = new Turtle(x0, y0, a0);

        turtle.goForward(step);

        turtle.turnLeft(120.0);

        turtle.goForward(step);

        turtle.turnLeft(120.0);

        turtle.goForward(step);

        turtle.turnLeft(120.0);

    }

}