meter.js

var inherits = require('inherits');
var Entity = require('crtrdg-entity');

module.exports = Meter;

function Meter(options) {
  Entity.call(this);

  var self = this;

  this.level = 100;
  this.rate = 1;
  this.size = { y: 11 };
  this.listeners = [];

  if (options.hasOwnProperty("name")) {
    this.name = options.name;
  }
  if (options.hasOwnProperty("color")) {
    this.color = options.color;
  }
  if (options.hasOwnProperty("game")) {
    this.game = options.game;
  }
  if (options.hasOwnProperty("camera")) {
    this.camera = options.camera;
  }
  this.position = options.position;

  this.game.addIntervalEvent(this);

  this.everySecond = function() {
    if (this.level > 0) {
      this.level -= 1;
      this.listeners.forEach(function(listener, index, array) {
        listener.changeEvent("remove", 1);
      });
    }

    //console.log(this.name + " meter level: "+ this.level);
  };

  this.on('draw', function(c) {
    c.save();

    var label = this.name;

    c.fillStyle = "white";
    c.font = "12px Arial";
    c.fillText(label, self.position.x - 5, self.position.y + 9);

    c.beginPath();
    c.lineWidth = 2;
    c.strokeStyle = "black";

    c.fillStyle = self.color;
    c.rect(
      self.position.x + 45,// - self.camera.position.x + 45,
      self.position.y,// - self.camera.position.y,
      102,
      self.size.y + 2
    );
    c.stroke();

    c.fillRect(
      self.position.x + 46, // - self.camera.position.x + 46,
      self.position.y + 1, // - self.camera.position.y + 1,
      self.level,
      self.size.y
    );
    c.restore();
  });
};

inherits(Meter, Entity);

// Add value to this meter
Meter.prototype.add = function(value) {
  var new_level = this.level += value;
  if (new_level > 100) {
    new_level = 100;
  }
  this.level = new_level;
}

// Remove value to this meter
Meter.prototype.remove = function(value) {
  var new_level = this.level -= value;
  if (new_level < 0) {
    new_level = 0;
  }
  this.level = new_level;
  this.listeners.forEach(function(listener, index, array) {
    listener("remove", value);
  });
}

Meter.prototype.addListener = function(listener) {
  this.listeners.push(listener);
}