homework.js

var sqrt = Math.sqrt;
var pow = Math.pow;
var random = Math.random;

/* POINT */

var Point = function (x, y) {
  this.x = x || 0;
  this.y = y || 0;
}

Point.prototype.getDistance = function(point) {
  return sqrt(pow(point.y - this.y, 2) + pow(point.x - this.y, 2));
};

Point.prototype.translate = function(dx, dy) {
  this.x += dx;
  this.y += dy;

  return this;
};


/* TRIANGLE */

var Triangle = function (p1, p2, p3) {
  this.p1 = p1;
  this.p2 = p2;
  this.p3 = p3;

  this.l1 = p2.getDistance(p3);
  this.l2 = p3.getDistance(p1);
  this.l3 = p1.getDistance(p2);
}

Triangle.prototype.getPerimeter = function() {
  return this.l1 + this.l2 + this.l3;
};

Triangle.prototype.getArea = function() {
  var p = this.getPerimeter() / 2;

  return sqrt(p*(p - this.l1)*(p - this.l2)*(p - this.l3));
};


var randomPoint = function () {
  var x1 = random() * 200 - 100;
  var y1 = random() * 200 - 100;
  
  return new Point(x1, y1);
};

var randomPoints = function (n) {
  var n = n || 1;
  var res = new Array(n);

  for (var i = 0; i < n ; i += 1) {
    res[i] = randomPoint();
  }

  return res;
}

var points = randomPoints(100);

var sopraLaBisettrice = function (array){
  var test = function (point){
    return point.y - point.x > 0 ;  
  }
  var result = array.filter (function (item,index,array){
    return test(item);
  })
  return result ;

} 

var Line = function (a, b, c){
  if (!(this instanceof Line )){
    return new Line (a,b,c);
  }

  this.a = a || 0;
  this.b = b || 0;
  this.c = c || 0;
}

Point.prototype.distance = function (Line){
  var distance = Math.abs((( line.a * this.x ) + (line.b * this.y) + line.c )) / Math.sqrt ((Math.pow(line.a,2) + Math.pow(line.b,2))
  return distance;  
}