Class: Doom::Wad::Sprite

Inherits:
Object
  • Object
show all
Defined in:
lib/doom/wad/sprite.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name, width, height, left_offset, top_offset, columns) ⇒ Sprite

Returns a new instance of Sprite.



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# File 'lib/doom/wad/sprite.rb', line 8

def initialize(name, width, height, left_offset, top_offset, columns)
  @name = name
  @width = width
  @height = height
  @left_offset = left_offset
  @top_offset = top_offset
  @columns = columns
end

Instance Attribute Details

#height ⇒ Object (readonly)

Returns the value of attribute height.



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# File 'lib/doom/wad/sprite.rb', line 6

def height
  @height
end

#left_offset ⇒ Object (readonly)

Returns the value of attribute left_offset.



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# File 'lib/doom/wad/sprite.rb', line 6

def left_offset
  @left_offset
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/doom/wad/sprite.rb', line 6

def name
  @name
end

#top_offset ⇒ Object (readonly)

Returns the value of attribute top_offset.



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# File 'lib/doom/wad/sprite.rb', line 6

def top_offset
  @top_offset
end

#width ⇒ Object (readonly)

Returns the value of attribute width.



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# File 'lib/doom/wad/sprite.rb', line 6

def width
  @width
end

Class Method Details

.load(wad, lump_name) ⇒ Object

Load a sprite from a WAD patch lump



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# File 'lib/doom/wad/sprite.rb', line 22

def self.load(wad, lump_name)
  entry = wad.directory.find { |e| e.name == lump_name }
  return nil unless entry

  data = wad.read_lump_at(entry)
  return nil if data.size < 8

  width = data[0, 2].unpack1('v')
  height = data[2, 2].unpack1('v')
  left_offset = data[4, 2].unpack1('s<')
  top_offset = data[6, 2].unpack1('s<')

  # Read column offsets
  column_offsets = []
  width.times do |i|
    column_offsets << data[8 + i * 4, 4].unpack1('V')
  end

  # Read columns
  columns = []
  width.times do |x|
    column = Array.new(height, nil)  # nil = transparent
    offset = column_offsets[x]

    # Read posts for this column
    loop do
      break if offset >= data.size
      row_start = data[offset].ord
      break if row_start == 255  # End of column marker

      post_height = data[offset + 1].ord
      break if post_height == 0 || offset + 3 + post_height > data.size

      # Skip padding byte, read pixels, skip trailing padding
      post_height.times do |i|
        y = row_start + i
        if y < height
          column[y] = data[offset + 3 + i].ord
        end
      end

      offset += post_height + 4  # row_start + count + padding + pixels + padding
    end

    columns << column
  end

  new(lump_name, width, height, left_offset, top_offset, columns)
end

Instance Method Details

#column_pixels(x) ⇒ Object 



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# File 'lib/doom/wad/sprite.rb', line 17

def column_pixels(x)
  @columns[x] || []
end