gann-cdf / turtle-logo

import org.gannacademy.cdf.turtlelogo.Turtle;

import org.gannacademy.cdf.turtlelogo.docs.SavableTerrarium;

public class Hearts {

    public static void arc(Turtle turtle, double radius, double arcLength) {

        for (int i = 0; i < arcLength; i++) {

            turtle.rt(1);

            turtle.fd(2.0 * Math.PI * radius / 360.0);

        }

    }

    public static void heart(Turtle turtle, double size) {

        double heading = turtle.getHeadingInDegrees();

        double  radius = size / 4.0,

                side = size / 2.0 - (radius - Math.cos(Math.PI / 4.0) * radius),

                diagonal = Math.sqrt(2 * Math.pow(side, 2));

        turtle.lt(45);

        arc(turtle, radius, 225);

        turtle.head(heading);

        arc(turtle, radius, 225);

        turtle.fd(diagonal);

        turtle.rt(90);

        turtle.fd(diagonal);

        turtle.head(heading);

    }

}