EVR.Animation.Scroller = function(graphics, step, rate)
{
   EVR.Animation.call(this, rate);
   this.graphics = graphics;
   this.step = step;
}
EVR.Animation.Scroller.prototype = new EVR.Animation;
EVR.Animation.Scroller.prototype.sequence = function()
{
   var graphics = this.graphics;
   var range = graphics[0].container.get_dimensions()[0];
   var current, width, x, difference, step = this.step * range;
   for (var ii = 0, len = graphics.length; ii < len; ii++)
   {
      current = graphics[ii];
      width = current.get_dimensions()[0];
      x = current.get_coordinates()[0] - step;
      if (x < -width)
      {
	 difference = -x - width;
	 x = range - difference;
      }
      current.set_coordinates([x]);
   }
}
EVR.Animation.Scroller.prototype.toString = function()
{
   return "[object EVR.Animation.Scroller]";
}

EVR.Animation.Introduction.Black_Hole = function(introduction, rate)
{
   var container = introduction.container;
   var width = introduction.beam_width_ratio;
   EVR.Beam.call(this, container, "black", width, null, null, ALIGN_TOP);
   EVR.Animation.call(this, introduction.rate);
   this.introduction = introduction;
   this.entrance = introduction.entrance;
   this.set_opacity(0);
   this.place(0, introduction.offset);
}
EVR.Animation.Introduction.Black_Hole.prototype = new EVR.Beam;
EVR.inherit(EVR.Animation.Introduction.Black_Hole, EVR.Animation);
EVR.Animation.Introduction.Black_Hole.prototype.sequence = function(step)
{
   var new_opacity = this.get_opacity() + step;
   this.set_opacity(new_opacity);
   if (new_opacity >= 1 || new_opacity <= 0)
   {
      this.stop();
      if (new_opacity >= 1)
      {
	 this.set_opacity(1);
	 this.next.play();
      }
      else
      {
	 this.set_opacity(0);
	 var current = this;
	 window.setTimeout(
	    function()
	    {
	       current.introduction.play();
	    }, INTRODUCTION_RESET_DELAY);
      }
   }
}
EVR.Animation.Introduction.Black_Hole.prototype.remove = function()
{
   this.stop();
   if (this.attached)
   {
      EVR.Beam.prototype.remove.call(this);
   }
}
EVR.Animation.Introduction.Black_Hole.prototype.toString = function()
{
   return "[object EVR.Animation.Introduction.Black_Hole]";
}

EVR.Animation.Introduction.Entrance = function(
   emoticon, jump, option_count, top_edge, bottom_edge, rate)
{
   EVR.Animation.call(this, rate);
   this.emoticon = emoticon;
   this.jump = jump;
   this.option_count = option_count;
   this.top_edge = top_edge;
   this.bottom_edge = bottom_edge;
   this.distance = 0;
}
EVR.Animation.Introduction.Entrance.prototype = new EVR.Animation;
EVR.Animation.Introduction.Entrance.prototype.sequence = function()
{
   var step = this.jump * INTRODUCTION_EMOTICON_WALK_SPEED;
   this.distance += step;
   this.emoticon.move(step, 0);
   if (this.distance >= this.jump)
   {
      this.stop();
   }
}
EVR.Animation.Introduction.Entrance.prototype.travel = function(boundary)
{
   boundary -= this.emoticon.get_dimensions(true)[0];
   var step = this.jump * INTRODUCTION_EMOTICON_RUN_SPEED;
   this.emoticon.move(step, 0);
   var border = this.get_border();
   if (border >= boundary)
   {
      this.emoticon.move(boundary - border);
      this.stop();
   }
}
EVR.Animation.Introduction.Entrance.prototype.get_border = function()
{
   return this.emoticon.get_coordinates(true)[0] + 
      this.emoticon.get_dimensions(true)[0];
}
EVR.Animation.Introduction.Entrance.prototype.raise = function(black_hole)
{
   var step = this.jump * INTRODUCTION_EMOTICON_FLOAT_SPEED;
   this.emoticon.move(null, -step);
   var y = this.emoticon.get_coordinates(true)[1];
   if (y <= this.top_edge)
   {
      this.stop();
      this.emoticon.move(null, this.top_edge - y);
      this.end(black_hole);
   }
}
EVR.Animation.Introduction.Entrance.prototype.end = function(black_hole)
{
   this.stop();
   var y_offset = this.jump * this.option_count;
   this.emoticon.range = black_hole;
   this.emoticon.place(null, -y_offset);
   this.offset();
}
EVR.Animation.Introduction.Entrance.prototype.offset = function()
{
   this.emoticon.draw();
   if (this.emoticon.range != this.emoticon.container)
   {
      var x_offset = this.emoticon.get_dimensions(true)[0] * 2;
      this.emoticon.place(-x_offset);
   }
}
EVR.Animation.Introduction.Entrance.prototype.toString = function()
{
   return "[object EVR.Animation.Introduction.Entrance]";
}

EVR.include("Beam.js");
EVR.include("animation/introduction/Black_Hole.js");
EVR.include("animation/introduction/transmission/Transmission.js");
EVR.include("animation/introduction/Entrance.js");
EVR.include("animation/introduction/Prompt.js");
EVR.Animation.Introduction = function(container, emoticon, title)
{
   this.container = container;
   this.emoticon = emoticon;
   this.title = title;
   this.beam_width_ratio = INTRODUCTION_BEAM_WIDTH_RATIO;
   this.margin = MENU_OPTION_MARGIN;
   this.option_count = TRANSMISSION_COLORS.length;
   this.offset = INTRODUCTION_Y_RATIO;
   this.rate = INTRODUCTION_FRAMERATE;
   this.cleared = false;
   this.set_jump();
   this.set_edges();
   this.add_children();
   this.prompt.play();
   this.play();
}
EVR.Animation.Introduction.prototype.set_jump = function()
{
   this.jump = BEAM_HEIGHT_RATIO + this.margin;
}
EVR.Animation.Introduction.prototype.set_edges = function()
{
   var beam_displacement = this.margin + BEAM_HEIGHT_RATIO;
   this.top_edge = this.offset - beam_displacement * this.option_count;
   this.bottom_edge = this.offset + beam_displacement;
}
EVR.Animation.Introduction.prototype.add_children = function()
{
   this.entrance = new EVR.Animation.Introduction.Entrance(
      this.emoticon, this.jump, this.option_count, this.top_edge,
      this.bottom_edge, this.rate);
   this.black_hole = new EVR.Animation.Introduction.Black_Hole(this);
   this.transmission = new EVR.Animation.Introduction.Transmission(
      this.container, this.black_hole, this.option_count, this.jump, this.rate);
   this.prompt = new EVR.Animation.Introduction.Prompt(this.container);
}
EVR.Animation.Introduction.prototype.play = function()
{
   this.transmission.reset();
   this.black_hole.next = this.transmission.projections;
   this.black_hole.play(null, INTRODUCTION_DELAY, BLACK_HOLE_FADE_IN_SPEED);
}
EVR.Animation.Introduction.prototype.redraw = function()
{
   if (this.title.attached)
   {
      this.title.draw();
   }
   if (this.cleared == false)
   {
      this.black_hole.draw();
      this.transmission.redraw();
   }
}
EVR.Animation.Introduction.prototype.clear = function()
{
   this.black_hole.remove();
   this.transmission.erase();
   this.prompt.remove();
   this.prompt.stop();
   this.cleared = true;
}
EVR.Animation.Introduction.prototype.toString = function()
{
   return "[object EVR.Animation.Introduction]";
}