OOP.js

OOP.js

/*
OOP 
- incapsulare

 Ascunderea datelor interne si controlul accesului la ele prin metode publice.

 Campurile: #id, #color, #x, #y, #borderWidth # visibile sunt declarate cu #, adica sunt private, 

 nu pot fi accesate direct din afara clasei. Shape.#x ar da eroare

Accesul la ele se face prin metode publice controlate
getId()
getColor()
move(dx,dy)
show() / hide()

Datele sunt protejate

- Mostenire
- abstractizare
- polimorfism

*/
//clasa de baza
class Shape {

      #id;
      #color;
      #x;
      #y;
      #borderWidth;
      #visible;      

      constructor(id, color, x, y, borderWidth = 1) {

      	  this.#id = id;
      	  this.#color = color;
      	  this.#x = x;
      	  this.#y = y;
      	  this.#borderWidth = borderWidth;
      	  this.#visible = true;
      }


      getId() {
      	return this.#id
      }

      getColor() {
      	return this.#color
      }

      getPosition() {

      	return {
      		 x: this.#x,
      		 y: this.#y
      	};
      }

      move(dx, dy) {
      	this.#x += dx
      	this.#y += dy
      }

      hide() {
      	this.#visible = false;
      }

      show() {
      	this.#visible = true;
      }

      computeArea() {

      	throw new Error("computeArea() trebuie implementata")
      }

      displayInfo() {

      	 console.log(`ID: ${this.#id} Color: ${this.#color} Position: ( ${this.#x}, ${this.#y} Border: ${this.#borderWidth}px Visible: ${this.#visible}`)  

      }
}


//mostenire OOP
//clasa derivata sau Subclasa
class Circle extends Shape {

      #radius;

      constructor(id, color, x, y, borderWidth, radius) {

                 super(id, color, x, y, borderWidth);

                 this.#radius = radius;
      }

      computeArea() {

             return Math.PI * this.#radius ** 2;
      }

}


class Rectangle extends Shape {

      #width;
      #height;

      constructor(id, color, x, y, borderWidth, width, height) {


      	   super(id, color, x, y, borderWidth);

      	   this.#width = width
      	   this.#height = height
      }  

      computeArea() {

      	  return this.#width * this.#height;
      }

}


class Triangle extends Shape {


	 #base;
	 #height;

	 constructor(id, color, x, y, borderWidth, base, height) {

	 	  super(id, color, x, y, borderWidth);

	 	  this.#base = base;

	 	  this.#height = height;

	 }

	 computeArea() {

	 	return (this.#base * this.#height) / 2;
	 }
}