Space Filling Curve - Moore Curve

package com.gmail.lueejava;

import java.util.ArrayList;
import java.util.Scanner;

public class DrawSpaceFillingCurve {
    public static void main(String args[]){
        Scanner input = new Scanner(System.in);
        int degree = 0;
        int partX, sizeX = 0;
        int partY, sizeY = 0;
        int orient = 0;
        String pattern = "LFL+F+LFL";
        String changePattern = "";
        ArrayList<StringBuilder> graphicRows = new ArrayList<StringBuilder>();

        System.out.println("Moore Curve - http://en.wikipedia.org/wiki/Moore_curve");
        System.out.print("Enter Degree of the Space Filling Curve: ");
        degree = input.nextInt();
        System.out.println();

        // Builds Path to Follow
        for(int i = 1; i < degree; i++){
            for(int j = 0; j < pattern.length(); j++){
                if(pattern.charAt(j) == 'L')
                    changePattern += "-RF+LFL+FR-";
                if(pattern.charAt(j) == 'R')
                    changePattern += "+LF-RFR-FL+";
                if(pattern.charAt(j) == 'F' || pattern.charAt(j) == '+' || pattern.charAt(j) == '-')
                    changePattern += pattern.charAt(j);
            }
            pattern = changePattern;
            changePattern = "";
        }
        // Finds Full Size X/Y
        sizeY = (int) (2 * Math.pow(2.0, degree) - 1.0);
        sizeY -= 1; // Start at 0
        sizeX = sizeY;

        // Setting Start Point
        partX = (int) (Math.pow(2.0, degree) - 1.0);
        partX -= 1; // Start at 0
        partY = sizeY;
        input.close();

        //Forcing Graphic List To Be Full Size
        for(int i = 0; i <= sizeY; i++){
            graphicRows.add(i, new StringBuilder(""));
            graphicRows.get(i).setLength(sizeX+1);
        }


        //Start ASCII Drawing.
        graphicRows.get(partY).setCharAt(partX, '#');
        for(int i = 0; i < pattern.length(); i++){
            if (pattern.charAt(i) == '+' || pattern.charAt(i) == '-'){
                orient = changeOrientation(pattern.charAt(i), orient);
            } else if (pattern.charAt(i) == 'F'){
                for (int j = 0; j < 2; j++){
                    if (orient == 0){
                        partY--;
                    }else if (orient == 1){
                        partX++;
                    }else if (orient == 2){
                        partY++;
                    }else if (orient == 3){
                        partX--;
                    }
                    graphicRows.get(partY).setCharAt(partX, '#'); // Places #
                }
            }
        }

        // Reads Strings and Prints
        for(int i = 0; i < graphicRows.size(); i++){
            for(int j = 0; j < graphicRows.get(i).toString().length(); j++){
                if(graphicRows.get(i).toString().charAt(j) == '#'){
                    System.out.print("#");
                }else{
                    System.out.print(" ");
                }
            }
            System.out.println();
        }
        System.out.println();
        System.out.println("Written by: Colton Fairley");
    }

    private static int changeOrientation(char charAt, int orient) {
        if (charAt == '+'){
            if (orient == 3){
                orient = 0;
            } else {
                orient++;
            }
        } else if (charAt == '-'){
            if (orient == 0){
                orient = 3;
            } else {
                orient--;
            }
        }
        return orient;
    }
}