projects.mako.cc - selectricity/blob - lib/gruff-0.2.8/lib/gruff/area.rb

   1
   2 require File.dirname(__FILE__) + '/base'
   3
   4 class Gruff::Area < Gruff::Base
   5
   6   def draw
   7     super
   8
   9     return unless @has_data
  10
  11     @x_increment = @graph_width / (@column_count - 1).to_f
  12     @d = @d.stroke 'transparent'
  13
  14     @norm_data.each do |data_row|
  15       poly_points = Array.new
  16       prev_x = prev_y = 0.0
  17       @d = @d.fill data_row[DATA_COLOR_INDEX]
  18
  19       data_row[1].each_with_index do |data_point, index|
  20         # Use incremented x and scaled y
  21         new_x = @graph_left + (@x_increment * index)
  22         new_y = @graph_top + (@graph_height - data_point * @graph_height)
  23
  24         if prev_x > 0 and prev_y > 0 then
  25           poly_points << new_x
  26           poly_points << new_y
  27
  28           #@d = @d.polyline(prev_x, prev_y, new_x, new_y)
  29         else
  30           poly_points << @graph_left
  31           poly_points << @graph_bottom - 1
  32           poly_points << new_x
  33           poly_points << new_y
  34
  35           #@d = @d.polyline(@graph_left, @graph_bottom, new_x, new_y)
  36         end
  37
  38         draw_label(new_x, index)
  39
  40         prev_x = new_x
  41         prev_y = new_y
  42       end
  43
  44       # Add closing points, draw polygon
  45       poly_points << @graph_right
  46       poly_points << @graph_bottom - 1
  47       poly_points << @graph_left
  48       poly_points << @graph_bottom - 1
  49
  50       @d = @d.polyline(*poly_points)
  51
  52     end
  53
  54     @d.draw(@base_image)
  55   end
  56
  57
  58 end