Module: Denko::Display::PixelCommon

Included in:
SPICommon
Defined in:
lib/denko/display/pixel_common.rb

Instance Method Summary collapse

Instance Method Details

#canvas ⇒ Object 



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# File 'lib/denko/display/pixel_common.rb', line 49

def canvas
  @canvas ||= Canvas.new(columns, rows, colors: colors)
end

#colors ⇒ Object 



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# File 'lib/denko/display/pixel_common.rb', line 45

def colors
  @colors ||= params[:colors] || 1
end

#columns ⇒ Object Also known as: cols 



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# File 'lib/denko/display/pixel_common.rb', line 4

def columns
  return @columns if @columns
  @columns = self.class.const_get("COLUMNS") if self.class.const_defined?("COLUMNS")
  @columns = params[:width] if params[:width]
  @columns = params[:columns] if params[:columns]
  @columns
end

#draw(x_start = x_min, x_finish = x_max, y_start = y_min, y_finish = y_max) ⇒ Object 



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# File 'lib/denko/display/pixel_common.rb', line 70

def draw(x_start=x_min, x_finish=x_max, y_start=y_min, y_finish=y_max)
  # Convert y-coords to page coords.
  p_start  = y_start  / 8
  p_finish = y_finish / 8

  colors.times do |i|
    draw_partial(canvas.framebuffers[i], x_start, x_finish, p_start, p_finish, i+1)
  end

  refresh
end

#get_partial_buffer(buffer, x_start, x_finish, p_start, p_finish) ⇒ Object 



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# File 'lib/denko/display/pixel_common.rb', line 56

def get_partial_buffer(buffer, x_start, x_finish, p_start, p_finish)
  # If bounds == max bounds, just return the buffer.
  return buffer if (x_start == x_min) && (x_finish == x_max) && (p_start == p_min) && (p_finish == p_max)

  # Copy bytes for the given rectangle into a temp buffer.
  temp_buffer = []
  (p_start..p_finish).each do |page|
    src_start = (columns * page) + x_start
    src_end   = (columns * page) + x_finish
    temp_buffer += buffer[src_start..src_end]
  end
  temp_buffer
end

#p_max ⇒ Object 



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# File 'lib/denko/display/pixel_common.rb', line 41

def p_max
  @p_max ||= (rows / 8.0).ceil - 1
end

#p_min ⇒ Object 



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# File 'lib/denko/display/pixel_common.rb', line 37

def p_min
  @p_min ||= 0
end

#refresh ⇒ Object 



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# File 'lib/denko/display/pixel_common.rb', line 53

def refresh
end

#rows ⇒ Object 



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# File 'lib/denko/display/pixel_common.rb', line 13

def rows
  return @rows if @rows
  @rows = self.class.const_get("ROWS") if self.class.const_defined?("ROWS")
  @rows = params[:height] if params[:height]
  @rows = params[:rows] if params[:rows]
  @rows
end

#x_max ⇒ Object 



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# File 'lib/denko/display/pixel_common.rb', line 25

def x_max
  @x_max ||= columns - 1
end

#x_min ⇒ Object 



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# File 'lib/denko/display/pixel_common.rb', line 21

def x_min
  @x_min ||= 0
end

#y_max ⇒ Object 



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# File 'lib/denko/display/pixel_common.rb', line 33

def y_max
  @y_max ||= rows - 1
end

#y_min ⇒ Object 



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# File 'lib/denko/display/pixel_common.rb', line 29

def y_min
  @y_min ||= 0
end