class Gruff::Area

Public Instance Methods

draw() click to toggle source
# File lib/gruff/area.rb, line 6
def draw
  super

  return unless @has_data

  @x_increment = @graph_width / (@column_count - 1).to_f
  @d = @d.stroke 'transparent'

  @norm_data.each do |data_row|
    poly_points = Array.new
    prev_x = prev_y = 0.0
    @d = @d.fill data_row[DATA_COLOR_INDEX]

    data_row[DATA_VALUES_INDEX].each_with_index do |data_point, index|
      # Use incremented x and scaled y
      new_x = @graph_left + (@x_increment * index)
      new_y = @graph_top + (@graph_height - data_point * @graph_height)

      if prev_x > 0 and prev_y > 0 then
        poly_points << new_x
        poly_points << new_y
        
        #@d = @d.polyline(prev_x, prev_y, new_x, new_y)
      else
        poly_points << @graph_left
        poly_points << @graph_bottom - 1
        poly_points << new_x
        poly_points << new_y
        
        #@d = @d.polyline(@graph_left, @graph_bottom, new_x, new_y)
      end

      draw_label(new_x, index)

      prev_x = new_x
      prev_y = new_y
    end

    # Add closing points, draw polygon
    poly_points << @graph_right
    poly_points << @graph_bottom - 1
    poly_points << @graph_left
    poly_points << @graph_bottom - 1

    @d = @d.polyline(*poly_points)

  end

  @d.draw(@base_image)
end