Class: Display

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

Overview

Graphics Display

Constant Summary collapse

BLACK = 
'000'
WHITE = 
'FFF'
DSTD_HEIGHT = 
600
DSTD_WIDTH = 
600

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(grid, framerate = 60) ⇒ Display

Returns a new instance of Display.



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# File 'lib/display.rb', line 17

def initialize(grid, framerate=60)
  SDL2.init(SDL2::INIT_VIDEO | SDL2::INIT_TIMER | SDL2::INIT_EVENTS)
  @window      = create_window
  @renderer    = window.create_renderer(-1, 0)
  @framerate   = framerate

  @grid        = grid
  @grid_height = Grid::ROWS
  @grid_width  = Grid::COLS

  @cell_width  = DSTD_WIDTH / Grid::COLS
  @cell_height = DSTD_HEIGHT / Grid::ROWS
end

Instance Attribute Details

#event_function ⇒ Object

Returns the value of attribute event_function.



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# File 'lib/display.rb', line 15

def event_function
  @event_function
end

#framerate ⇒ Object

Returns the value of attribute framerate.



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# File 'lib/display.rb', line 15

def framerate
  @framerate
end

#renderer ⇒ Object

Returns the value of attribute renderer.



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# File 'lib/display.rb', line 15

def renderer
  @renderer
end

#window ⇒ Object

Returns the value of attribute window.



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# File 'lib/display.rb', line 15

def window
  @window
end

Class Method Details

.render_grid(grid) ⇒ Object 



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# File 'lib/display.rb', line 75

def self.render_grid(grid)
  new(grid).render
end

Instance Method Details

#event_handler ⇒ Object 



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# File 'lib/display.rb', line 44

def event_handler
  while ev = SDL2::Event.poll
    if SDL2::Event::KeyDown === ev && ev.scancode == SDL2::Key::Scan::ESCAPE
      exit
    end
  end
end

#plot_cell(cell) ⇒ Object 



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# File 'lib/display.rb', line 64

def plot_cell(cell)
  @renderer.draw_color = decode_color(cell.state == Cell::ALIVE ? WHITE : BLACK)
  @renderer.fill_rect(
    SDL2::Rect.new(
      cell.coordinates[0] * @cell_height,
      cell.coordinates[1] * @cell_width,
      @cell_height, @cell_width
    )
  )
end

#plot_grid ⇒ Object 



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# File 'lib/display.rb', line 52

def plot_grid
  @grid.map do |row|
    row.map do |cell|
      plot_cell(cell)
    end
  end
end

#render ⇒ Object 



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# File 'lib/display.rb', line 31

def render
  loop do
    event_handler

    clear_screen
    plot_grid
    update_grid

    @renderer.present
    sleep 1.0 / @framerate
  end
end

#update_grid ⇒ Object 



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

def update_grid
  @grid.inc_gen
end