yaqt/lib/bounds.js

Yet another quad tree

module.exports = Bounds;

function Bounds(x, y, half) {
  this.x = typeof x === 'number' ? x : 0;
  this.y = typeof y === 'number' ? y : 0;
  this.half = typeof half === 'number' ? half : 0;
}

Bounds.prototype.left = function left() {
  return this.x - this.half;
};

Bounds.prototype.top = function top() {
  return this.y - this.half;
};

Bounds.prototype.width = function width() {
  return this.half * 2;
};

Bounds.prototype.height = function height() {
  return this.half * 2;
};

Bounds.prototype.centerX = function cx() {
  return this.x;
};

Bounds.prototype.centerY = function cy() {
  return this.y;
};

Bounds.prototype.contains = function contains(x, y) {
  var half = this.half;
  return this.x - half <= x && x < this.x + half &&
         this.y - half <= y && y < this.y + half;
};