Class: Retrograph::Easy::SpriteManager

Inherits:
Object
  • Object
show all
Defined in:
lib/retrograph/easy/sprites.rb

Constant Summary collapse

BLANK_SPRITES = 
("\000" * 256).freeze

Instance Method Summary collapse

Constructor Details

#initialize(display) ⇒ SpriteManager

Returns a new instance of SpriteManager.



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# File 'lib/retrograph/easy/sprites.rb', line 43

def initialize(display)
  @display = display
  @sprite_data = "\000" * 4
  @data_offset = 0
  @flip_flags = 0
  @other_flags = 0
  @x_exp = 0
  @y_exp = 0
  @x = 0
  @y = 0
  @mirror_x = 0
  @mirror_y = 0
end

Instance Method Details

#add_multi_sprite(x, y, pattern, width_tiles, height_tiles, flags) ⇒ Object 



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# File 'lib/retrograph/easy/sprites.rb', line 91

def add_multi_sprite(x, y, pattern, width_tiles, height_tiles, flags)
  add_sprite_group(x, y, width_tiles << 3, height_tiles << 3, flags) do
    row = 0
    while row < height_tiles
      col = 0
      while col < width_tiles
        add_sprite(x + (col << 3), y + (row << 3), (pattern + col) & 0xff, 0)
        col += 1
      end
      pattern += 32
      row += 1
    end
  end
  nil
end

#add_sprite(x, y, pattern, flags) ⇒ Object 



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# File 'lib/retrograph/easy/sprites.rb', line 107

def add_sprite(x, y, pattern, flags)
  return nil unless @data_offset < 256
  x = @mirror_x - x if (@flip_flags & 0b00100000).nonzero?
  y = @mirror_y - y if (@flip_flags & 0b00010000).nonzero?
  x = (x << @x_exp) + @x
  y = (y << @y_exp) + @y
  if x >= 0 and x < 256 and y >= 0 and y < 224
    flags = (flags ^ @flip_flags) | @other_flags
    @sprite_data._retrograph_set_byte(0, x)
    @sprite_data._retrograph_set_byte(1, y + 1)
    @sprite_data._retrograph_set_byte(2, pattern)
    @sprite_data._retrograph_set_byte(3, flags)
    @display.write_vdu(0x7e00 + @data_offset, @sprite_data)
  end
  @data_offset += 4
  nil
end

#add_sprite_group(x, y, width, height, flags) ⇒ Object 



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# File 'lib/retrograph/easy/sprites.rb', line 57

def add_sprite_group(x, y, width, height, flags)
  saved_flip_flags = @flip_flags
  saved_other_flags = @other_flags
  saved_x_exp = @x_exp
  saved_y_exp = @y_exp
  saved_x = @x
  saved_y = @y
  saved_mirror_x = @mirror_x
  saved_mirror_y = @mirror_y
  begin
    x = @mirror_x - x if (@flip_flags & 0b00100000).nonzero?
    y = @mirror_y - y if (@flip_flags & 0b00010000).nonzero?
    @x = (x << @x_exp) + @x
    @y = (y << @y_exp) + @y
    @flip_flags ^= flags & 0b00110000
    @other_flags |= flags & 0b00001111
    @x_exp = (@flip_flags & 0b00001000) >> 3
    @y_exp = (@flip_flags & 0b00000100) >> 2
    @mirror_x = (width << @x_exp) - (8 << @x_exp)
    @mirror_y = (height << @y_exp) - (8 << @y_exp)
    yield
  rescue
    @flip_flags = saved_flip_flags
    @other_flags = saved_other_flags
    @x_exp = saved_x_exp
    @y_exp = saved_y_exp
    @x = saved_x
    @y = saved_y
    @mirror_x = saved_mirror_x
    @mirror_y = saved_mirror_y
  end
  nil
end

#clear_sprites ⇒ Object 



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# File 'lib/retrograph/easy/sprites.rb', line 125

def clear_sprites
  @display.write_vdu(0x7e00, BLANK_SPRITES)
  @data_offset = 0
  self
end