Class: Gruff::Bezier

Inherits:
Base
  • Object
show all
Defined in:
lib/gruff/bezier.rb

Constant Summary

Constants inherited from Base

Gruff::Base::DATA_COLOR_INDEX, Gruff::Base::DATA_LABEL_INDEX, Gruff::Base::DATA_VALUES_INDEX, Gruff::Base::DATA_VALUES_X_INDEX, Gruff::Base::DEBUG, Gruff::Base::DEFAULT_MARGIN, Gruff::Base::DEFAULT_TARGET_WIDTH, Gruff::Base::LABEL_MARGIN, Gruff::Base::LEGEND_MARGIN, Gruff::Base::THOUSAND_SEPARATOR

Instance Attribute Summary

Attributes inherited from Base

#additional_line_values, #bold_title, #bottom_margin, #center_labels_over_point, #colors, #font, #font_color, #has_left_labels, #hide_legend, #hide_line_markers, #hide_line_numbers, #hide_title, #label_formatting, #label_max_size, #label_stagger_height, #label_truncation_style, #labels, #left_margin, #legend_at_bottom, #legend_box_size, #legend_font_size, #legend_margin, #marker_color, #marker_count, #marker_font_size, #marker_shadow_color, #maximum_value, #minimum_value, #no_data_message, #right_margin, #show_labels_for_bar_values, #sort, #sorted_drawing, #stacked, #title, #title_font, #title_font_size, #title_margin, #top_margin, #use_data_label, #x_axis_increment, #x_axis_label, #y_axis_increment, #y_axis_label

Instance Method Summary collapse

Methods inherited from Base

#add_color, #data, #initialize, #initialize_ivars, #margins=, #replace_colors, #theme=, #theme_37signals, #theme_greyscale, #theme_keynote, #theme_odeo, #theme_pastel, #theme_rails_keynote, #to_blob, #write

Methods included from Deprecated

#graph_height, #graph_left, #graph_top, #graph_width, #scale_measurements, #total_height

Constructor Details

This class inherits a constructor from Gruff::Base

Instance Method Details

#draw ⇒ Object 



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# 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 << 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