//Victor Lam, 10/19/12
import gpdraw.*;

public class KochCurve
{
    private DrawingTool pen;
    private SketchPad paper;

    public KochCurve()
    {
        paper = new SketchPad(500,500);
        pen = new DrawingTool(paper);
    }

    public void drawKochCurve(int level, double length)
    {
        /* The base case is a straight line
         * Else draw something like this _/\_
         */
        if(level == 0){
            pen.forward(length);
        }
        else {
            drawKochCurve(level - 1, length/ 3);
            pen.turnLeft(60);
            drawKochCurve(level - 1, length/3);
            pen.turnRight(120);
            drawKochCurve(level - 1, length/3);
            pen.turnLeft(60);
            drawKochCurve(level - 1, length/3);
        }
    }

    /*
     * Turn right and then draw the graph, rotate and then draw more
     * Draw until a snowflake
     */
    public void drawKoch(int level, int length){
        pen.turnRight();
        drawKochCurve(level, length);
        pen.turnRight(120);
        drawKochCurve(level, length);
        pen.turnRight(120);
        drawKochCurve(level, length);
    }
}