Computer scienceProgramming languagesKotlinObject-oriented programmingClass hierarchy

Introduction to Interfaces

Implementing an interface

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Suppose we're now making some kind of a 2D simulation, where we have vectors and moving objects. Fix the implementation of the interface Moving and implement its functions in the YourMovingObject class.

data class Vector2(var x: Int, var y: Int)        

interface Moving {
    var currentCoordinates: Vector2

    var speed: Int

    var direction: Vector2

    // This function changes the X and Y coordinates
    // Vector2 of the object by the value equal to 
    // the multiplied speed of the object by the direction 
    // of the object plus the current coordinate.
    // (the object has the same speed along the X and Y axes).
    fun move()

    // This function reduces the speed of an object
    // along X and Y axes 
    fun slowDown(subtractedSpeed: Int)

    // This function increases the speed of an object
    // along X and Y axes 
    fun speedUp(addedSpeed: Int)

    // This function sets a new speed vector, 
    // changing the X and Y values of speed
    fun rotate(newDirection: Vector2)
}

Write a program in Kotlin

// Do not change the code below.

data class Vector2(var x: Int, var y: Int)

interface Moving {

var currentCoordinates: Vector2

var speed: Int

var direction: Vector2

// This function changes X and Y coordinates

// of an object by the amount of the object's speed

// (object has same speed along X and Y axis)

// according to direction of the object.

fun move()

// This function reduces the speed of an object

// along X and Y axes, subtracting given amount.

fun slowDown(subtractedSpeed: Int)

// This function increases the speed of an object

// along X and Y axes, adding given amount.

fun speedUp(addedSpeed: Int)

// This function sets new direction for the object,

// overwriting previous values.

fun rotate(newDirection: Vector2)

}

// Do not change the code above.

class YourMovingObject(

override var currentCoordinates: Vector2,

override var speed: Int,

override var direction: Vector2

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