Lesson 4 Activity 1

package Lesson4;
import kareltherobot.Robot;
import kareltherobot.World;
//This program causes the robot to move until the left side is clear, once it is clear it does a back flip

public class Activity1Main extends Robot {
    /**
     * Constructor for Activity1Main class
     * @param a
     * @param s
     * @param d
     * @param b
     * @ return - none
     */
    public Activity1Main(int a, int s, Direction d, int b){
        super(a,s,d,b);
    }
    public static void main(String[] args){
        World.readWorld("Lesson4World1.kwld");
        World.setDelay(50);
        World.setVisible();
        //New super robot
        Activity1Main gary = new Activity1Main(1,3,North,0);
        //Calls on move method four times, but it is overridden
        gary.move();
        gary.move();
        gary.move();
        gary.move();
        //Does a back flip
        gary.backFlip();

    }

    /**
     * Overrides move method to make the robot move only when the left is not clear
     * @ param - none
     * @ return - void
     */
    public void move(){
        if(!(leftIsClear())){
            super.move();
        }
    }

    /**
     * Checks to see if left is clear by turning left and using frontIsClear method from Robot
     * @ param - none
     * @return - true if front is clear and false if it is not
     */
    public boolean leftIsClear(){
        turnLeft();
        if(frontIsClear()){
            turnRight();
            return true;
        }
        turnRight();
        return false;
    }

    /**
     * Allows robot to do back flip
     * @ param - none
     * @ return - void
     */
    public void backFlip(){
        turnLeft();
        turnLeft();
        turnLeft();
        turnLeft();
    }

    /**
     * Allows robot to turn right
     * @ param - none
     * @ return - void
     */
    public void turnRight(){
        int delay = World.delay();
        //Sets delay to 0 so it can instantaneously turn right
        World.setDelay(0);
        turnLeft();
        turnLeft();
        //Delay set back to normal
        World.setDelay(delay);
        turnLeft();
    }


}