class ImageParadise::Gruff::Bezier

Public Instance Methods

draw() click to toggle source
#

draw

#
Calls superclass method ImageParadise::Gruff::Base#draw
# File lib/image_paradise/graphs/bezier.rb, line 14
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 << new_x
        poly_points << new_y
      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