Class: Screen

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

Constant Summary collapse

OFFSET = 
-20

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(width, height, world) ⇒ Screen

Returns a new instance of Screen.



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# File 'lib/roflbalt.rb', line 45

def initialize width, height, world
  @width = width
  @height = height
  @world = world
  @background = world.background
  create_frame_buffer
  %x{stty -icanon -echo}
  print "\033[0m" # reset
  print "\033[2J" # clear screen
  print "\x1B[?25l" # disable cursor
end

Instance Attribute Details

#height ⇒ Object (readonly)

Returns the value of attribute height.



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# File 'lib/roflbalt.rb', line 56

def height
  @height
end

#width ⇒ Object (readonly)

Returns the value of attribute width.



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# File 'lib/roflbalt.rb', line 56

def width
  @width
end

#world ⇒ Object (readonly)

Returns the value of attribute world.



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# File 'lib/roflbalt.rb', line 56

def world
  @world
end

Instance Method Details

#create_frame_buffer ⇒ Object 



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# File 'lib/roflbalt.rb', line 57

def create_frame_buffer
  @fb = Framebuffer.new @background
end

#draw(renderable) ⇒ Object 



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# File 'lib/roflbalt.rb', line 60

def draw renderable
  renderable.each_pixel(world.ticks) do |x, y, pixel|
    @fb.set x, y, pixel
  end
end

#on_exit ⇒ Object 



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# File 'lib/roflbalt.rb', line 90

def on_exit
  print "\033[0m" # reset colours
  print "\x1B[?25h" # re-enable cursor
  print "\n"
end

#render(start_time) ⇒ Object 



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# File 'lib/roflbalt.rb', line 65

def render start_time
  print "\e[H"
  buffer = ''
  previous_pixel = nil
  (0...height).each do |y|
    (OFFSET...(width + OFFSET)).each do |x|
      pixel = @fb.get(x, y)
      if Pixel === previous_pixel && Pixel === pixel && pixel.color_equal?(previous_pixel)
        buffer << pixel.char
      else
        buffer << pixel.to_s
      end
      previous_pixel = pixel
    end
    buffer << "\n"
  end
  print "\033[0m"

  dt = Time.new.to_f - start_time;
  target_time = 0.04
  sleep target_time - dt if dt < target_time

  print buffer
  create_frame_buffer
end