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Methods

Gruff::Bezier

Public Instance Methods

draw() click to toggle source
# File lib/gruff/bezier.rb, line 4
def draw
  super

  return unless @has_data

  @x_increment = @graph_width / (@column_count - 1).to_f

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

    data_row[1].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 index == 0 && RUBY_PLATFORM != 'java'
        poly_points << @graph_left
        poly_points << @graph_bottom - 1
      end

      poly_points << new_x
      poly_points << new_y

      draw_label(new_x, index)
    end
 
    @d = @d.fill_opacity 0.0
    @d = @d.stroke data_row[DATA_COLOR_INDEX]
    @d = @d.stroke_width clip_value_if_greater_than(@columns / (@norm_data.first[1].size * 4), 5.0)

    if RUBY_PLATFORM == 'java'
      @d = @d.polyline(*poly_points)
    else
      @d = @d.bezier(*poly_points)
    end
  end

  @d.draw(@base_image)
end

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