Class: AnsiSys::Cursor

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

Constant Summary collapse

CODE_LETTERS =

Escape sequence codes processed in this Class

%w(A B C D E F G H f)

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(cur_col = 1, cur_row = 1, max_col = 80, max_row = 25) ⇒ Cursor

Returns a new instance of Cursor.



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# File 'lib/ansisys.rb', line 142

def initialize(cur_col = 1, cur_row = 1, max_col = 80, max_row = 25)
  @cur_col = cur_col
  @cur_row = cur_row
  @max_col = max_col
  @max_row = max_row
end

Instance Attribute Details

#cur_col ⇒ Object (readonly)

current column number (1-)



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# File 'lib/ansisys.rb', line 137

def cur_col
  @cur_col
end

#cur_row ⇒ Object (readonly)

current row number (1-)



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# File 'lib/ansisys.rb', line 138

def cur_row
  @cur_row
end

#max_col ⇒ Object

maximum column number



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# File 'lib/ansisys.rb', line 139

def max_col
  @max_col
end

#max_row ⇒ Object

maximum row number



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# File 'lib/ansisys.rb', line 140

def max_row
  @max_row
end

Instance Method Details

#advance!(width = 1) ⇒ Object

changes current location for a character with width to be echoed



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# File 'lib/ansisys.rb', line 194

def advance!(width = 1)
  r = nil
  @cur_col += width
  if @cur_col > @max_col
    line_feed!
    r = "\n"
  end
  return r
end

#apply_code!(letter, *pars) ⇒ Object

applies self an escape sequence code that ends with letter as String and with some pars as Integers



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# File 'lib/ansisys.rb', line 151

def apply_code!(letter, *pars)
  case letter
  when 'A'
    @cur_row -= pars[0] ? pars[0] : 1
    @cur_row = @max_row if @max_row and @cur_row > @max_row
  when 'B'
    @cur_row += pars[0] ? pars[0] : 1
    @cur_row = @max_row if @max_row and @cur_row > @max_row
  when 'C'
    @cur_col += pars[0] ? pars[0] : 1
  when 'D'
    @cur_col -= pars[0] ? pars[0] : 1
  when 'E'
    @cur_row += pars[0] ? pars[0] : 1
    @cur_col = 1
    @max_row = @cur_row if @max_row and @cur_row > @max_row
  when 'F'
    @cur_row -= pars[0] ? pars[0] : 1
    @cur_col = 1
    @max_row = @cur_row if @max_row and @cur_row > @max_row
  when 'G'
    @cur_col = pars[0] ? pars[0] : 1
  when 'H'
    @cur_row = pars[0] ? pars[0] : 1
    @cur_col = pars[1] ? pars[1] : 1
    @max_row = @cur_row if @max_row and @cur_row > @max_row
  when 'f'
    @cur_row = pars[0] ? pars[0] : 1
    @cur_col = pars[1] ? pars[1] : 1
    @max_row = @cur_row if @max_row and @cur_row > @max_row
  end
  if @cur_row < 1
    @cur_row = 1
  end
  if @cur_col < 1
    @cur_col = 1
  elsif @cur_col > @max_col
    @cur_col = @max_col
  end
  return self
end

#fit!(width = 1) ⇒ Object

check if a character with width fits within the maximum columns, feed a line if not



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# File 'lib/ansisys.rb', line 206

def fit!(width = 1)
  r = nil
  if @cur_col + width > @max_col + 1
    line_feed!
    r = "\n"
  end
  return r
end

#line_feed! ⇒ Object

feed a line



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# File 'lib/ansisys.rb', line 216

def line_feed!
  @cur_col = 1
  @cur_row += 1
  @max_row = @cur_row if @max_row and @cur_row > @max_row
end