package main;

import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.canvas.Canvas;
import javafx.scene.canvas.GraphicsContext;
import javafx.stage.Stage;

public class Turtle extends Application {

    double angle = 90;
    double oldX = 0;
    double oldY = 300;
    double x = 0;
    double y = 300;

    GraphicsContext gc;

    public static void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(Stage primaryStage) {
        primaryStage.setTitle("Schildkroeten und Fraktale <3");
        Group root = new Group();
        Canvas canvas = new Canvas(600, 600);
        gc = canvas.getGraphicsContext2D();
        root.getChildren().add(canvas);
        primaryStage.setScene(new Scene(root));
        primaryStage.show();

        //hier Methoden aufrufen
        koch(600,5);

    }

    private void _zeroKoch(double length){
    	forward(length / 3);
    	turn(-60);
    	forward(length / 3);
    	turn(120);
    	forward(length / 3);
    	turn(-60);
    	forward(length / 3);
    }

    public void koch(double length, int depth){
    	if(depth == 1) {
    		_zeroKoch(length);
    		return;
    	}

    	koch(length / 3, depth - 1);
    	turn(-60);
    	koch(length / 3, depth - 1);
    	turn(120);
    	koch(length / 3, depth - 1);
    	turn(-60);
    	koch(length / 3, depth - 1);
    }

    public void turn( double degree ){
        if ( (angle += degree) > 360 )
            angle %= 360;
    }

    public void forward( double step ){
        oldX = x;
        oldY = y;

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

        gc.strokeLine( (int) x, (int) y, (int) oldX, (int) oldY );
    }

}