[VXAce] Tankenai Realistic Shadow

=begin
================================================================================
                  wltr3565's Tankentai Realistic Shadow
                                v0.3 VX Ace
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This script is a mere eye candy, simply to make Tankentai's battler shadows true
to the battlers' original sprites. But I'm very sure this is not perfect yet.
This version, v0.1, is open to public to be tested for more improvements. Alas,
this script is not perfect. I lack the experience to straightly configure bitmap
drawing. I cannot make sprites slanted as in photoshop. This is the best that I
can do in RGSS3. Please do give feedbacks for further improvements, especially
bugs.

Do free to use it for your own purpose. Just credit me, and watch out for bugs.
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Features:
- Easy to install; Just insert this below Tankentai.
- Make shadows realistic, true to their real form.
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Notes:
- Realistic shadows means making the process heavier than simple shadows. It's
  not recommended yet for low-end PCs.
- The shadows may be misplaced. You can configure the positions by adjusting
  the shadows' position in SBS Battler Configuration.
- Don't ask about this script's compatibility between Kaduki Tankentai, Default
  Tankentai, etc. THIS IS OBVIOUSLY COMPATIBLE FOR ALL VERSIONS OF TANKENTAI!!!
  Except you have a script that do something with shadows.
- It is recommeded to use detailed sprites (Not chibi style e.g. Kaduki's) with
  this script.
- For now it only shades greatly for northern (from screen) source of light.
- This is for RMVX Ace version of Tankentai, and thus, for RMVX Ace only. Not
  to mention that enu remade Tankentai for Ace from scratch!
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Checklist:
- Note to set SHADOW at SBS General Settings to true.
- def shadow of actors and enemies to be placed in this script for more
  convinient configuration
 
=end
module WLTR
  SHADE_PERSPECTIVE = 0.4 # Simply the shadow's vertical zoom, for perspective.
end

class SideView
  def shadow_plus # To adjust each battlers' shadow position, which is non-
                  # existent in Tankentai Ace.
    case id
    when 1 # Actor ID 1
      return [ 0, 9] # [ X, Y]
    when -1 # Enemy ID 1. Enemy IDs are marked with minus.
      return [ 0, 8]
    end
    # Default shadow positioning for all unassigned Enemy IDs.
    return [ 0, 12]
  end
end

class Sprite_Battler < Sprite_Base
  def create_shadow
    reset_shadow
    return if @battler.sv.shadow == false
    @shadow = Sprite.new(viewport) if @shadow == nil
    @shadow.bitmap = self.bitmap
    @shadow.src_rect = self.src_rect
    @shadow.ox = @battler.sv.cw - self.ox
    @shadow.oy = self.oy
    @shadow.zoom_x = $sv_camera.zoom
    @shadow.zoom_y = $sv_camera.zoom * WLTR::SHADE_PERSPECTIVE
    @shadow.tone.set(-255, -255, -255)
    update_shadow
  end
 
  def update_shadow
    @shadow.visible = @battler.sv.shadow_visible
    @shadow.opacity = 108 * @battler.sv.opacity / 255 if @battler.sv.opacity_data[3]
    @shadow.opacity = 108 * self.opacity / 255 if !@battler.sv.opacity_data[3]
    @shadow.ox = @battler.sv.cw - self.ox
    @shadow.oy = self.oy
    @shadow.mirror = !self.mirror
    @shadow.angle = 180 - self.angle
    @shadow.x = @real_x - $sv_camera.x + @battler.sv.shadow_plus[0]
    @shadow.y = (@battler.sv.y - @battler.sv.c)/ 100 - $sv_camera.y + @battler.sv.shadow_plus[1]
    @shadow.z = @battler.sv.z - 10
    @shadow.zoom_x = $sv_camera.zoom
    @shadow.zoom_y = $sv_camera.zoom * WLTR::SHADE_PERSPECTIVE
    @shadow.x += $sv_camera.sx / 100
    @shadow.y += $sv_camera.sy / 100
    @shadow.x *= $sv_camera.zoom
    @shadow.y *= $sv_camera.zoom
  end

  def update_bitmap_actor
    if @battler.character_name != @battler_name or @battler.character_index != @battler_index
      @battler_name = @battler.character_name
      @battler_index = @battler.character_index
      @battler_graphic_file_index = @battler.sv.graphic_file_index
      @graphic_mirror_flag = @battler.sv.graphic_mirror_flag
      self.bitmap = Cache.character(@battler_name + @battler_graphic_file_index)
      @battler.sv.setup(self.bitmap.width, self.bitmap.height, @battler_id != @battler.id)
      create_shadow
      init_visibility
      @battler_id = @battler.id
      @shadow.bitmap = self.bitmap if @shadow != nil
    end
  end

  def update_src_rect
    return if @battler.sv.collapse
    if @battler_graphic_file_index != @battler.sv.graphic_file_index
      @battler_graphic_file_index = @battler.sv.graphic_file_index
      self.bitmap = Cache.character(@battler_name + @battler_graphic_file_index) if @battler.actor?
      self.bitmap = Cache.battler(@battler_name + @battler_graphic_file_index, @battler_hue) if !@battler.actor?
      @battler.sv.set_graphics(self.bitmap.width, self.bitmap.height)
      @shadow.bitmap = self.bitmap if @shadow != nil
    end
    anime_off if @battler.sv.anime_off
    self.src_rect.set(@battler.sv.sx, @battler.sv.sy, @battler.sv.cw, @battler.sv.ch)
    self.opacity = @battler.sv.opacity if @battler_visible
    @shadow.src_rect = self.src_rect if @shadow != nil
    set_process_timing(@battler.sv.timing) if @battler && @battler.sv.timing != []
  end
end
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