class CustomTilemapAutotiles
  attr_accessor :changed
  def initialize
   @changed=true
   @tiles=[nil,nil,nil,nil,nil,nil,nil]
  end
  def []=(i,value)
   @tiles[i]=value
   @changed=true
  end
  def [](i)
   return @tiles[i]
  end
end

class CustomTilemap
  Animated_Autotiles_Frames = 15
  Autotiles = [
    [ [27, 28, 33, 34], [ 5, 28, 33, 34], [27,  6, 33, 34], [ 5,  6, 33, 34],
      [27, 28, 33, 12], [ 5, 28, 33, 12], [27,  6, 33, 12], [ 5,  6, 33, 12] ],
    [ [27, 28, 11, 34], [ 5, 28, 11, 34], [27,  6, 11, 34], [ 5,  6, 11, 34],
      [27, 28, 11, 12], [ 5, 28, 11, 12], [27,  6, 11, 12], [ 5,  6, 11, 12] ],
    [ [25, 26, 31, 32], [25,  6, 31, 32], [25, 26, 31, 12], [25,  6, 31, 12],
      [15, 16, 21, 22], [15, 16, 21, 12], [15, 16, 11, 22], [15, 16, 11, 12] ],
    [ [29, 30, 35, 36], [29, 30, 11, 36], [ 5, 30, 35, 36], [ 5, 30, 11, 36],
      [39, 40, 45, 46], [ 5, 40, 45, 46], [39,  6, 45, 46], [ 5,  6, 45, 46] ],
    [ [25, 30, 31, 36], [15, 16, 45, 46], [13, 14, 19, 20], [13, 14, 19, 12],
      [17, 18, 23, 24], [17, 18, 11, 24], [41, 42, 47, 48], [ 5, 42, 47, 48] ],
    [ [37, 38, 43, 44], [37,  6, 43, 44], [13, 18, 19, 24], [13, 14, 43, 44],
      [37, 42, 43, 48], [17, 18, 47, 48], [13, 18, 43, 48], [ 1,  2,  7,  8] ]
  ]
  FlashOpacity=[100,90,80,70,80,90]
  attr_reader :tileset
  attr_reader :autotiles
  attr_reader :map_data
  attr_accessor :flash_data
  attr_accessor :priorities
  attr_reader :visible
  attr_accessor :ox
  attr_accessor :oy
  attr_reader :viewport
  attr_accessor :tone
  attr_accessor :color
  def graphicsHeight
    return 480
  end
  def graphicsWidth
    return 640
  end
  def initialize(viewport)
    @tileset    = nil  # Refers to Map Tileset Name
    @autotiles  = CustomTilemapAutotiles.new
    @map_data   = nil  # Refers to 3D Array Of Tile Settings
    @flash_data = nil  # Refers to 3D Array of Tile Flashdata
    @priorities = nil  # Refers to Tileset Priorities
    @visible    = true # Refers to Tileset Visibleness
    @ox         = 0    # Bitmap Offsets
    @oy         = 0    # bitmap Offsets
    @plane       = false
    @tone=Tone.new(0,0,0,0)
    @color=Color.new(0,0,0,0)
    @oldtone=Tone.new(0,0,0,0)
    @oldcolor=Color.new(0,0,0,0)
    @selfviewport=Viewport.new(0,0,graphicsWidth,graphicsHeight)
    @viewport=viewport ? viewport : @selfviewport
    @tiles=[]
    @autotileInfo=[]
    @regularTileInfo=[]
    @oldOx=0
    @oldOy=0
    @layer0=Sprite.new(viewport)
    @layer0.visible=true
    @nowshown=false
    @layer0.bitmap=Bitmap.new([graphicsWidth*2,1].max,[graphicsHeight*2,1].max)
    @flash=nil
    @layer0.ox=0
    @layer0.oy=0
    @oxLayer0=0
    @oyLayer0=0
    @oxFlash=0
    @oyFlash=0
    @layer0.z=0
    @priotiles=[]
    @prioautotiles=[]
    @autosprites=[]
    @framecount=[]
    @tilesetChanged=true
    @flashChanged=false
    @firsttime=true
    @disposed=false
    @usedsprites=false
    @layer0clip=true
    @firsttimeflash=true
    @fullyrefreshed=false
    @fullyrefreshedautos=false
  end
  def disposed?
   return @disposed
  end
  def flash_data=(value)
   @flash_data=value
   @flashChanged=true
  end
  def update
    if @oldtone!=@tone
      @layer0.tone=@tone
      @flash.tone=@tone if @flash
      for sprite in @autosprites
        sprite.tone=@tone
      end
      for sprite in @tiles
        sprite.tone=@tone if sprite.is_a?(Sprite)
      end
      @oldtone=@tone.clone
    end
    if @oldcolor!=@color
      @layer0.color=@color
      @flash.color=@color if @flash
      for sprite in @autosprites
        sprite.color=@color
      end
      for sprite in @tiles
        sprite.color=@color if sprite.is_a?(Sprite)
      end
      @oldcolor=@color.clone
    end
    if @autotiles.changed
      refresh_autotiles
      repaintAutotiles
    end
    if @flashChanged
      refresh_flash
    end
    if @tilesetChanged
      refresh_tileset
    end
    if @flash
     @flash.opacity=FlashOpacity[(Graphics.frame_count/2) % 6]
    end
    if !(@oldOx==@ox && @oldOy==@oy &&
           !@tilesetChanged &&
           !@autotiles.changed)
      refresh
    end
    if (Graphics.frame_count % Animated_Autotiles_Frames == 0) || @nowshown
      repaintAutotiles
      refresh(true)
    end
    @nowshown=false
    @autotiles.changed=false
    @tilesetChanged=false
  end
def priorities=(value)
  @priorities=value
  @tilesetChanged=true
end
def tileset=(value)
  @tileset=value
  @tilesetChanged=true
end
def shown?
   return false if !@visible
   ysize=@map_data.ysize
   xsize=@map_data.xsize
   xStart=(@ox/32)-1
   xEnd=((@ox+@viewport.rect.width)/32)+1
   yStart=(@oy/32)-1
   yEnd=((@oy+@viewport.rect.height)/32)+1
   xStart=0 if xStart<0
   xStart=xsize-1 if xStart>=xsize
   xEnd=0 if xEnd<0
   xEnd=xsize-1 if xEnd>=xsize
   yStart=0 if yStart<0
   yStart=ysize-1 if yStart>=ysize
   yEnd=0 if yEnd<0
   yEnd=ysize-1 if yEnd>=ysize
   return (xStart<xEnd && yStart<yEnd)
end
def dispose
 return if disposed?
 @help.dispose if @help
 @help=nil
 i=0;len=@autotileInfo.length;while i<len
  if @autotileInfo[i]
     @autotileInfo[i].dispose
     @autotileInfo[i]=nil
  end
  i+=1
 end
 i=0;len=@regularTileInfo.length;while i<len
  if @regularTileInfo[i]
     @regularTileInfo[i].dispose
     @regularTileInfo[i]=nil
  end
  i+=1
 end
 i=0;len=@tiles.length;while i<len
  @tiles[i].dispose
  @tiles[i]=nil
  i+=2
 end
 i=0;len=@autosprites.length;while i<len
  @autosprites[i].dispose
  @autosprites[i]=nil
  i+=2
 end
 if @layer0
  @layer0.bitmap.dispose if !@layer0.disposed?
  @layer0.bitmap=nil if !@layer0.disposed?
  @layer0.dispose
  @layer0=nil
 end
 if @flash
  @flash.bitmap.dispose if !@flash.disposed?
  @flash.bitmap=nil if !@flash.disposed?
  @flash.dispose
  @flash=nil
 end
 for i in 0...7
  self.autotiles[i]=nil
 end
 @tiles.clear
 @autosprites.clear
 @autotileInfo.clear
 @regularTileInfo.clear
 @tilemap=nil
 @tileset=nil
 @priorities=nil
 @selfviewport.dispose
 @selfviewport=nil
 @disposed=true
end

def bltAutotile(bitmap,x,y,id,frame)
  return if frame<0
  autotile=@autotiles[id/48-1]
  return if !autotile 
  if autotile.height==32
    anim=frame<<5
    src_rect=Rect.new(anim,0,32,32)
    bitmap.blt(x,y,autotile,src_rect)
  else
    anim=frame*96
    id%=48
    tiles = Autotiles[id>>3][id&7]
    src=Rect.new(0,0,0,0)
    for i in 0...4
      tile_position = tiles[i] - 1
      src.set(
       (tile_position % 6)*16 + anim,
       (tile_position / 6)*16, 16, 16)
      bitmap.blt(i%2*16+x,i/2*16+y, autotile, src)
    end
  end
end

def autotileNumFrames(id)
  autotile=@autotiles[id/48-1]
  return 0 if !autotile || autotile.disposed?
  frames=1
  if autotile.height==32
   frames=autotile.width>>5
  else
   frames=autotile.width/96
  end
  return frames
end

def autotileFrame(id)
  autotile=@autotiles[id/48-1]
  return -1 if !autotile || autotile.disposed?
  frames=1
  if autotile.height==32
   frames=autotile.width>>5
  else
   frames=autotile.width/96
  end
  return (Graphics.frame_count/Animated_Autotiles_Frames)%frames
end

def repaintAutotiles
 for i in 0...@autotileInfo.length
  next if !@autotileInfo[i]
  frame=autotileFrame(i)
  bltAutotile(@autotileInfo[i],0,0,i,frame)
 end
end

def getAutotile(sprite,id)
  anim=autotileFrame(id)
  return if anim<0
  bitmap=@autotileInfo[id]
  if !bitmap
    bitmap=Bitmap.new(32,32)
    bltAutotile(bitmap,0,0,id,anim)
    @autotileInfo[id]=bitmap
  end
  sprite.bitmap=bitmap if !sprite.equal?(bitmap) || sprite.bitmap!=bitmap
end

def getRegularTile(sprite,id)
 if false
  sprite.bitmap=@tileset if !sprite.equal?(@tileset) || sprite.bitmap!=@tileset
  sprite.src_rect.set(((id - 384)&7)<<5,((id - 384)>>3)<<5,32,32)
 else
  bitmap=@regularTileInfo[id]
  if !bitmap
   bitmap=Bitmap.new(32,32)
   rect=Rect.new(((id - 384)&7)<<5,((id - 384)>>3)<<5,32,32)
   bitmap.blt(0,0,@tileset,rect)
   @regularTileInfo[id]=bitmap
  end
  sprite.bitmap=bitmap if !sprite.equal?(bitmap) || sprite.bitmap!=bitmap
 end
end

def addTile(tiles,count,xpos,ypos,id)
   if id>=384
     if count>=tiles.length
      sprite=Sprite.new(@viewport)
      tiles.push(sprite,0)
     else
      sprite=tiles[count]
      tiles[count+1]=0
     end
     sprite.visible=@visible
     sprite.x=xpos
     sprite.y=ypos
     sprite.tone=@tone
     sprite.color=@color
     getRegularTile(sprite,id)
     spriteZ=(@priorities[id]==0||!@priorities[id]) ? 0 : ypos+@priorities[id]*32+32
     sprite.z=spriteZ
     count+=2
   else
     if count>=tiles.length
      sprite=Sprite.new(@viewport)
      tiles.push(sprite,1)
     else
      sprite=tiles[count]
      tiles[count+1]=1
     end
     sprite.visible=@visible
     sprite.x=xpos
     sprite.y=ypos
     sprite.tone=@tone
     sprite.color=@color
     getAutotile(sprite,id)
     spriteZ=(@priorities[id]==0||!@priorities[id]) ? 0 : ypos+@priorities[id]*32+32
     sprite.z=spriteZ
     count+=2
   end
   return count
end

def refresh_tileset
 i=0;len=@regularTileInfo.length;while i<len
  if @regularTileInfo[i]
     @regularTileInfo[i].dispose
     @regularTileInfo[i]=nil
  end
  i+=1
 end
 @regularTileInfo.clear
 @priotiles.clear
 ysize=@map_data.ysize
 xsize=@map_data.xsize
 zsize=@map_data.zsize
 if xsize>100 || ysize>100
  @fullyrefreshed=false
 else
  for z in 0...zsize
   for y in 0...ysize
    for x in 0...xsize
     id = @map_data[x, y, z]
     next if id==0 || !@priorities[id]
     next if @priorities[id]==0
     @priotiles.push([x,y,z,id])
    end
   end
  end
  @fullyrefreshed=true
 end
end

def refresh_flash
 if @flash_data && !@flash
  @flash=Sprite.new(viewport)
  @flash.visible=true
  @flash.z=1
  @flash.blend_type=1
  @flash.bitmap=Bitmap.new([graphicsWidth*2,1].max,[graphicsHeight*2,1].max)
  @firsttimeflash=true
 elsif !@flash_data && @flash
  @flash.bitmap.dispose if @flash.bitmap
  @flash.dispose
  @flash=nil
  @firsttimeflash=false
 end
end

def refresh_autotiles
 i=0;len=@autotileInfo.length;while i<len
  if @autotileInfo[i]
     @autotileInfo[i].dispose
     @autotileInfo[i]=nil
  end
  i+=1
 end
 i=0;len=@autosprites.length;while i<len
  if @autosprites[i]
     @autosprites[i].dispose
     @autosprites[i]=nil
  end
  i+=2
 end
 @autosprites.clear
 @autotileInfo.clear
 @prioautotiles.clear
 hasanimated=false
 for i in 0...7
  numframes=autotileNumFrames(48*(i+1))
  hasanimated=true if numframes>=2
  @framecount[i]=numframes
 end
 if hasanimated
  ysize=@map_data.ysize
  xsize=@map_data.xsize
  zsize=@map_data.zsize
  if xsize>100 || ysize>100
    @fullyrefreshedautos=false
  else
    for y in 0...ysize
     for x in 0...xsize
      haveautotile=false
      for z in 0...zsize
       id = @map_data[x, y, z]
       next if id==0 || id>=384 || @priorities[id]!=0 || !@priorities[id]
       next if @framecount[id/48-1]<2
       haveautotile=true
       break
      end
      @prioautotiles.push([x,y]) if haveautotile
     end
    end
    @fullyrefreshedautos=true
  end
 else
  @fullyrefreshedautos=true 
 end
end

def map_data=(value)
 @map_data=value
 @tilesetChanged=true
end

def refreshFlashSprite
 return if !@flash || @flash_data.nil?
 ptX=@ox-@oxFlash
 ptY=@oy-@oyFlash
 if !@firsttimeflash && !@usedsprites &&
    ptX>=0 && ptX+@viewport.rect.width<=@flash.bitmap.width &&
    ptY>=0 && ptY+@viewport.rect.height<=@flash.bitmap.height
  @flash.ox=0
  @flash.oy=0
  @flash.src_rect.set(ptX.round,ptY.round,
     @viewport.rect.width,@viewport.rect.height)
  return
 end
 width=@flash.bitmap.width
 height=@flash.bitmap.height
 bitmap=@flash.bitmap
 ysize=@map_data.ysize
 xsize=@map_data.xsize
 zsize=@map_data.zsize
 @firsttimeflash=false
 @oxFlash=@ox-(width>>2)
 @oyFlash=@oy-(height>>2)
 @flash.ox=0
 @flash.oy=0
 @flash.src_rect.set(width>>2,height>>2,
     @viewport.rect.width,@viewport.rect.height)
 @flash.bitmap.clear
 @oxFlash=@oxFlash.floor
 @oyFlash=@oyFlash.floor
 xStart=(@oxFlash>>5)
 xStart=0 if xStart<0
 yStart=(@oyFlash>>5)
 yStart=0 if yStart<0
 xEnd=xStart+(width>>5)+1
 yEnd=yStart+(height>>5)+1
 xEnd=xsize if xEnd>=xsize
 yEnd=ysize if yEnd>=ysize
 if xStart<xEnd && yStart<yEnd
  yrange=yStart...yEnd
  xrange=xStart...xEnd
  tmpcolor=Color.new(0,0,0,0)
  for y in yrange
   ypos=(y<<5)-@oyFlash
   for x in xrange
     xpos=(x<<5)-@oxFlash
     id = @flash_data[x, y, 0]
     r=(id>>8)&15
     g=(id>>4)&15
     b=(id)&15
     tmpcolor.set(r<<4,g<<4,b<<4)
     bitmap.fill_rect(xpos,ypos,32,32,tmpcolor)
   end
  end
 end
end


def refreshLayer0(autotiles=false)
 if autotiles
   return true if !shown?
 end
 ptX=@ox-@oxLayer0
 ptY=@oy-@oyLayer0
 if !autotiles && !@firsttime && !@usedsprites &&
    ptX>=0 && ptX+@viewport.rect.width<=@layer0.bitmap.width &&
    ptY>=0 && ptY+@viewport.rect.height<=@layer0.bitmap.height
  if @layer0clip
   @layer0.ox=0
   @layer0.oy=0
   @layer0.src_rect.set(ptX.round,ptY.round,
     @viewport.rect.width,@viewport.rect.height)
  else
   @layer0.ox=ptX.round
   @layer0.oy=ptY.round
   @layer0.src_rect.set(0,0,@layer0.bitmap.width,@layer0.bitmap.height)
  end
  return true
 end
 width=@layer0.bitmap.width
 height=@layer0.bitmap.height
 bitmap=@layer0.bitmap
 ysize=@map_data.ysize
 xsize=@map_data.xsize
 zsize=@map_data.zsize
 if autotiles
  return true if @fullyrefreshedautos && @prioautotiles.length==0
  xStart=(@oxLayer0>>5)
  xStart=0 if xStart<0
  yStart=(@oyLayer0>>5)
  yStart=0 if yStart<0
  xEnd=xStart+(width>>5)+1
  yEnd=yStart+(height>>5)+1
  xEnd=xsize if xEnd>xsize
  yEnd=ysize if yEnd>ysize
  return true if xStart>=xEnd || yStart>=yEnd
  trans=Color.new(0,0,0,0)
  temprect=Rect.new(0,0,0,0)
  tilerect=Rect.new(0,0,32,32)
  range=0...zsize
  overallcount=0
  count=0
  if !@fullyrefreshedautos
   for y in yStart..yEnd
    for x in xStart..xEnd
     haveautotile=false
     for z in range
      id = @map_data[x, y, z]
      next if id<48 || id>=384 || @priorities[id]!=0 || !@priorities[id]
      next if @framecount[id/48-1]<2
      if !haveautotile
        haveautotile=true
        overallcount+=1
        xpos=(x<<5)-@oxLayer0
        ypos=(y<<5)-@oyLayer0
        bitmap.fill_rect(xpos,ypos,0,0,trans) if overallcount<=2000
        break
      end
     end
     for z in range
      id = @map_data[x,y,z]
      next if id<48 || @priorities[id]!=0 || !@priorities[id]
      if overallcount>2000
       xpos=(x<<5)-@oxLayer0
       ypos=(y<<5)-@oyLayer0
       count=addTile(@autosprites,count,xpos,ypos,id)
       next
      elsif id>=384
       temprect.set(((id - 384)&7)<<5,((id - 384)>>3)<<5,32,32)
       xpos=(x<<5)-@oxLayer0
       ypos=(y<<5)-@oyLayer0
       bitmap.blt(xpos,ypos,@tileset,temprect)
      else
       tilebitmap=@autotileInfo[id]
       if !tilebitmap
        anim=autotileFrame(id)
        next if anim<0
        tilebitmap=Bitmap.new(32,32)
        bltAutotile(tilebitmap,0,0,id,anim)
        @autotileInfo[id]=tilebitmap
       end
       xpos=(x<<5)-@oxLayer0
       ypos=(y<<5)-@oyLayer0
       bitmap.blt(xpos,ypos,tilebitmap,tilerect)
      end
     end
    end
   end
  else
   for tile in @prioautotiles
    x=tile[0]
    y=tile[1]
    next if x<xStart||x>xEnd
    next if y<yStart||y>yEnd
    overallcount+=1
    xpos=(x<<5)-@oxLayer0
    ypos=(y<<5)-@oyLayer0
    bitmap.fill_rect(xpos,ypos,0,0,trans) if overallcount<=2000
    for z in range
     id = @map_data[x,y,z]
     next if id<48 || @priorities[id]!=0 || !@priorities[id]
     if overallcount>2000
      count=addTile(@autosprites,count,xpos,ypos,id)
      next
     elsif id>=384
      temprect.set(((id - 384)&7)<<5,((id - 384)>>3)<<5,32,32)
      bitmap.blt(xpos,ypos,@tileset,temprect)
     else
      tilebitmap=@autotileInfo[id]
      if !tilebitmap
        anim=autotileFrame(id)
        next if anim<0
        tilebitmap=Bitmap.new(32,32)
        bltAutotile(tilebitmap,0,0,id,anim)
        @autotileInfo[id]=tilebitmap
      end
      bitmap.blt(xpos,ypos,tilebitmap,tilerect)
     end
    end
   end
  end
  Graphics.frame_reset if overallcount>2000
  @usedsprites=false
  return true
 end
 return false if @usedsprites
 @firsttime=false
 @oxLayer0=@ox-(width>>2)
 @oyLayer0=@oy-(height>>2)
 if @layer0clip
  @layer0.ox=0
  @layer0.oy=0
  @layer0.src_rect.set(width>>2,height>>2,
     @viewport.rect.width,@viewport.rect.height)
 else
  @layer0.ox=(width>>2)
  @layer0.oy=(height>>2)
 end
 @layer0.bitmap.clear
 @oxLayer0=@oxLayer0.floor
 @oyLayer0=@oyLayer0.floor
 xStart=(@oxLayer0>>5)
 xStart=0 if xStart<0
 yStart=(@oyLayer0>>5)
 yStart=0 if yStart<0
 xEnd=xStart+(width>>5)+1
 yEnd=yStart+(height>>5)+1
 xEnd=xsize if xEnd>=xsize
 yEnd=ysize if yEnd>=ysize
 if xStart<xEnd && yStart<yEnd
  tmprect=Rect.new(0,0,0,0)
  yrange=yStart...yEnd
  xrange=xStart...xEnd
  for z in 0...zsize
   for y in yrange
    ypos=(y<<5)-@oyLayer0
    for x in xrange
     xpos=(x<<5)-@oxLayer0
     id = @map_data[x, y, z]
     next if id==0 || @priorities[id]!=0 || !@priorities[id]
     if id>=384
       tmprect.set((id - 384) % 8 * 32, (id - 384) / 8 * 32,32,32)
       bitmap.blt(xpos,ypos,@tileset,tmprect)
     else
       frame=autotileFrame(id)
       bltAutotile(bitmap,xpos,ypos,id,frame)
     end
    end
   end
  end
  Graphics.frame_reset
 end
 return true
end
def getResizeFactor
  return $ResizeFactor ? $ResizeFactor : 1.0
end
def ox=(val)
   val=(val*getResizeFactor).to_i
   val=(val/getResizeFactor).to_i
   wasshown=self.shown?
   @ox=val.floor
   @nowshown=(!wasshown && self.shown?)
end
def oy=(val)
   val=(val*getResizeFactor).to_i
   val=(val/getResizeFactor).to_i
   wasshown=self.shown?
   @oy=val.floor
   @nowshown=(!wasshown && self.shown?)
end
def visible=(val)
   wasshown=@visible
   @visible=val
   @nowshown=(!wasshown && val)
end
def refresh(autotiles=false)
 @oldOx=@ox
 @oldOy=@oy
 usesprites=false
 if @layer0
  @layer0.visible=@visible
  usesprites=!refreshLayer0(autotiles)
  if autotiles && !usesprites
   return
  end
 else
  usesprites=true
 end
 refreshFlashSprite
 vpx=@viewport.rect.x
 vpy=@viewport.rect.y
 vpr=@viewport.rect.width+vpx
 vpb=@viewport.rect.height+vpy
 xsize=@map_data.xsize
 ysize=@map_data.ysize
 minX=(@ox/32)-1
 maxX=((@ox+@viewport.rect.width)/32)+1
 minY=(@oy/32)-1
 maxY=((@oy+@viewport.rect.height)/32)+1
 minX=0 if minX<0
 minX=xsize-1 if minX>=xsize
 maxX=0 if maxX<0
 maxX=xsize-1 if maxX>=xsize
 minY=0 if minY<0
 minY=ysize-1 if minY>=ysize
 maxY=0 if maxY<0
 maxY=ysize-1 if maxY>=ysize
 count=0
 if minX<maxX && minY<maxY
  @usedsprites=usesprites || @usedsprites
  if @layer0
   @layer0.visible=false if usesprites
  end
  if @fullyrefreshed
   for prio in @priotiles
    x=prio[0]
    y=prio[1]
    next if x<minX||x>maxX
    next if y<minY||y>maxY
    id=prio[3]
    xpos=(x<<5)-@ox
    ypos=(y<<5)-@oy
    count=addTile(@tiles,count,xpos,ypos,id)
   end
  else
   for z in 0...@map_data.zsize
    for y in minY..maxY
     for x in minX..maxX
      id = @map_data[x, y, z]
      next if id==0 || !@priorities[id]
      next if @priorities[id]==0
      xpos=(x<<5)-@ox
      ypos=(y<<5)-@oy
      count=addTile(@tiles,count,xpos,ypos,id)
     end
    end
   end
  end
 end
 if count<@tiles.length
  bigchange=(count<=(@tiles.length*2/3)) && (@tiles.length*2/3)>25
  j=count;len=@tiles.length;while j<len
   sprite=@tiles[j]
   @tiles[j+1]=-1
   if bigchange
    sprite.dispose
    @tiles[j]=nil
    @tiles[j+1]=nil
   elsif !@tiles[j].disposed?
    sprite.visible=false if sprite.visible
   end
   j+=2
  end
  @tiles.compact! if bigchange
 end
end

end