Class: A2Printer::Bitmap

Inherits:
Object
  • Object
show all
Defined in:
lib/a2_printer.rb

Overview

Bitmaps

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(width_or_source, height = nil, source = nil) ⇒ Bitmap

Returns a new instance of Bitmap.



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# File 'lib/a2_printer.rb', line 204

def initialize(width_or_source, height=nil, source=nil)
  if height.nil? && source.nil?
    set_source(width_or_source)
    extract_width_and_height_from_data
  else
    set_source(source)
    @width = width_or_source
    @height = height
  end
end

Instance Attribute Details

#height ⇒ Object (readonly)

Returns the value of attribute height.



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# File 'lib/a2_printer.rb', line 202

def height
  @height
end

#width ⇒ Object (readonly)

Returns the value of attribute width.



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# File 'lib/a2_printer.rb', line 202

def width
  @width
end

Instance Method Details

#each_block ⇒ Object 



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# File 'lib/a2_printer.rb', line 215

def each_block
  row_start = 0
  width_in_bytes = width / 8
  while row_start < height do
    chunk_height = ((height - row_start) > 255) ? 255 : (height - row_start)
    bytes = (0...(width_in_bytes * chunk_height)).map { @data.getbyte }
    yield width_in_bytes, chunk_height, bytes
    row_start += 255
  end
end