Notes

/**
* This program is designed to draw a fractal using a string of characters to define the base pattern
*
* @author Sijia Liang
* @version 7/27/2016
*
*/
import java.awt.*;
import turtlegraphics.*;
class FractalEngine
{
FractalEngine() //default constructor for Fractal class
{
}
//write the set up drawing method here
public void prepareTurtleToDraw(Turtle myrtle, Color color, int x1, int y1, int x2, int y2)
{
myrtle.hide();
myrtle.penUp();
myrtle.setPenColor(color);
myrtle.setPenWidth(1);
myrtle.moveTo(x1, y1);
myrtle.penDown();
myrtle.moveTo(x2, y2);
myrtle.hide();
}
//moving method here
public void moveTurtle(Turtle myrtle, Color color, int x1, int y1, int x2, int y2)
{
prepareTurtleToDraw(myrtle, color, x1, y1, x2, y2); //prepare Turtle object at (x1, y1)
myrtle.moveTo(x2, y2); //move Turtle object to (x2, y2)
}
//write the drawFractal method here
public static void drawFractal(String rule)
{
//create objects for the world, the turtle, and the fractal class here
World worldObj = new World();
Turtle myrtleTheTurtle = new Turtle (400, 450, worldObj);
FractalEngine fractal = new FractalEngine();

int lengthOfString = rule.length();
int n = 0;
int beginIndex = n;
int endIndex = n + 1;
int lineLength = 5;
//end of setting up so it reads character by character

while (n <= lengthOfString && endIndex <= lengthOfString) //n cannot be longer than string of words
{
n++;
String subString = rule.substring(beginIndex, endIndex);
beginIndex = n;
endIndex = 1 + n;

if("F".equals(subString))
{
myrtleTheTurtle.forward(lineLength);
}
else if("+".equals(subString))
{
myrtleTheTurtle.turn(45);
}
else if("-".equals(subString))
{
myrtleTheTurtle.turn(-45);
}
}
}//end of if else if statement
}
public class FractalEngineTester
{
public static void main(String[] args)
{
//create objects for the world, the turtle, and the fractal class here

//the following series of drawing rules are supplied to help test your program.
//only one can be uncommented at a time.
//String drawingRule = "F";
//String rule = "F-F+F+F-F";
//String rule = "F-F+F+F-F-F-F+F+F-F+F-F+F+F-F+F-F+F+F-F-F-F+F+F-F";
String rule = "F-F+F+F-F-F-F+F+F-F+F-F+F+F-F+F-F+F+F-F-F-F+F+F-F-F-F+F+F-F-F-F+F+F-F+F-F+F+F-F+F-F+F+F-F-F-F+F+F-F+F-F+F+F-F-F-F+F+F-F+F-F+F+F-F+F-F+F+F-F-F-F+F+F-F+F-F+F+F-F-F-F+F+F-F+F-F+F+F-F+F-F+F+F-F-F-F+F+F-F-F-F+F+F-F-F-F+F+F-F+F-F+F+F-F+F-F+F+F-F-F-F+F+F-F";
FractalEngine.drawFractal(rule);
}
}