Bullets.js

/*Stores all bullets*/
function Bullets() {
  this.bullets = new Array();
}

/*Add an Bullet
@param {Point} The current position of a bullet
@param {Number} The starting rotation (in radians)
@param {Enemy} targetEnemy The enemy the bullet is targeting
@param {Integer} targetFrame The target frame of the bullet we are shooting
@param {Number} speed The speed of the bullet (in pixels per frame)
@param {Integer} drawingType 1 = circle, 2 = square, 3 = rectangle, 4 = long rectangle, 5 = rocket 
@param {Number} radius used for dimensions of all types of drawing types
@param {String} color The color to draw the bullet
*/
Bullets.prototype.add = function (
  position,
  rotation,
  targetEnemy,
  targetFrame,
  speed,
  drawingType,
  radius,
  color
) {
  var bullet = new Bullet(
    position,
    rotation,
    targetEnemy,
    targetFrame,
    speed,
    drawingType,
    radius,
    color
  );
  this.bullets.push(bullet);
};

/*Remove a Bullet
 *@param {Integer} index, The element to remove
 */
Bullets.prototype.remove = function (index) {
  this.bullets.splice(index, 1);
};

/*Remove all Bullets
 */
Bullets.prototype.removeAll = function () {
  for (var i = this.bullets.length - 1; i >= 0; i--) {
    this.remove(i);
  }
};

/*Draws all bullets, deletes all bullets that have reached the end of their life
 * @param {Canvas Drawing Context} ctx
 */
Bullets.prototype.drawAll = function (ctx, frame) {
  ctx.clearRect(0, 0, Background.WIDTH, Background.HEIGHT);
  for (var i = this.bullets.length - 1; i >= 0; i--) {
    if (this.bullets[i].draw(ctx)) {
      this.remove(i);
    }
  }
};