Module: PrintShopFont

Includes:
Font
Included in:
AppleDosPrintShopFont
Defined in:
lib/native_file_types/apple2/ApplePrintShopFont.rb

Instance Method Summary collapse

Methods included from Font

#draw_string, #font_description, #font_format, #normalised_font_name, #picture_format, #picture_height, #picture_width, #to_font, #to_picture

Instance Method Details

#ascii_to_shape_number(char) ⇒ Object 



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# File 'lib/native_file_types/apple2/ApplePrintShopFont.rb', line 109

def ascii_to_shape_number(char)
  b=char.upcase[0]
  case b
    when 32..90 then return b-32
  end
  nil
end

#char_height(char = "A") ⇒ Object 



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# File 'lib/native_file_types/apple2/ApplePrintShopFont.rb', line 53

def char_height(char="A")
  2*inter_character_gap+unpadded_char_height(char)
end

#char_width(char) ⇒ Object 



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# File 'lib/native_file_types/apple2/ApplePrintShopFont.rb', line 39

def char_width(char)
  inter_character_gap+unpadded_char_width(char)
end

#draw_char(canvas, char, x, y, colour) ⇒ Object 



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# File 'lib/native_file_types/apple2/ApplePrintShopFont.rb', line 116

def draw_char(canvas,char,x,y,colour)
  bitmap=get_bitmap(char)
  return [x,y] if bitmap.nil?
  bitmap.length.times do |line|
    bitmap[line].length.times do |col|
      if bitmap[line][col]==1 then
        canvas[x+col, y+line]=colour
      end
    end
  end
  [x+char_width(char),y]
end

#get_bitmap(char) ⇒ Object 



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# File 'lib/native_file_types/apple2/ApplePrintShopFont.rb', line 73

def get_bitmap(char)
  b=ascii_to_shape_number(char)
  return nil if b.nil?
  lo= contents[b+bitmap_pointer_lo_table]
  hi= contents[b+bitmap_pointer_hi_table]
  ptr=(hi<<8)+lo
  width_in_pixels=unpadded_char_width(char)
  padded_width_in_pixels=char_width(char)
  width_in_bytes=(width_in_pixels+7)/8
  height=unpadded_char_height(char)
# puts "#{char}/%02x = %04x - width-%02x/%01x, height=%02x" % [b,ptr,width_in_pixels,width_in_bytes,height]
  bitmap=[]
  inter_character_gap.times {bitmap<<Array.new(Array.new(padded_width_in_pixels,0))}
  offset=inter_character_gap
  height.times do |i|
    line=i+offset
    bitmap[line]=Array.new(padded_width_in_pixels,0)
    col=0
    width_in_bytes.times do 
      font_byte=data_without_header[ptr-load_address+i*width_in_bytes+col/8]
      8.times do |x_offset|
        bit_mask=1<<(8-(x_offset+1))
        if ((font_byte & bit_mask)==bit_mask) then
          bitmap[line][col]=1
        end
        col+=1
        break if col>=width_in_pixels
      end
    end
  end
  inter_character_gap.times {bitmap<<Array.new(Array.new(padded_width_in_pixels,0))}
  
  raise "bitmap length error" unless bitmap.length==char_height(char)
  bitmap
end

#get_charlist ⇒ Object 



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# File 'lib/native_file_types/apple2/ApplePrintShopFont.rb', line 23

def get_charlist
  if @charlist.nil? then
    @charlist=[]
    (32..90).each do |b|
      c=b.chr
      char_data={}
      char_data[:native_encoding]=b
      char_data[:unicode_encoding]=b
      char_data[:width]=char_width(c) #width in pixels
      char_data[:bitstreams]=get_bitmap(c)
      @charlist<<char_data
    end

  end
  @charlist
end

#inter_character_gap ⇒ Object 



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# File 'lib/native_file_types/apple2/ApplePrintShopFont.rb', line 49

def inter_character_gap
  2
end

#line_of_print ⇒ Object 



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# File 'lib/native_file_types/apple2/ApplePrintShopFont.rb', line 57

def line_of_print
 unpadded_char_height("A")
end

#point_size ⇒ Object 



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# File 'lib/native_file_types/apple2/ApplePrintShopFont.rb', line 66

def point_size
  if @point_size.nil? then
    @point_size=char_height('A')
  end
  @point_size
end

#unpadded_char_height(char) ⇒ Object 



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# File 'lib/native_file_types/apple2/ApplePrintShopFont.rb', line 60

def unpadded_char_height(char)
  b=ascii_to_shape_number(char)
  return nil if b.nil?
  return contents[b+height_table_start]
end

#unpadded_char_width(char) ⇒ Object 



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# File 'lib/native_file_types/apple2/ApplePrintShopFont.rb', line 43

def unpadded_char_width(char)
  b=ascii_to_shape_number(char)
  return nil if b.nil?
  return contents[b+width_table_start]
end