Line graph with error band

Example of line graph with error band.

The function draws a series of quadrilaterals whose vertices matched pairs of the two series data_up and data_down then inserting a line is the average values.
To actually use series with variable error just simply change the code by passing the three sets as parameters instead generate randomly.

test_it_controller.rb

class TestItController < ApplicationController
def index
 @graph1 = open_flash_chart_object(600,300,"/test_it/graph1_code")
end

def graph1_code

 title = Title.new("a Graph")

 chart = OpenFlashChart.new
 chart.set_title(title)

 @data_up = [1]
 @data_down = [-1]

 0.step(30, 1) {|i|
     @data_up << @data_up[i] +rand - 0.5
     @data_down << @data_down[i] + rand - 0.5
     }

 def draw_quadri(i)
   q = Shape.new( '#80B11A' )                        
   q.append_value(ShapePoint.new(i,@data_up[i]))
   q.append_value(ShapePoint.new(i,@data_down[i]))
   q.append_value(ShapePoint.new(i+1,@data_down[i+1]))
   q.append_value(ShapePoint.new(i+1,@data_up[i+1])) 
   return q
 end

 flux = []
 (@data_up.length-1).times do |h|
   flux << draw_quadri(h)
   end

 flux.each do  |shape|
    chart.add_element(shape)
    end

 scatter_line = ScatterLine.new( '#FF0000', 5 )
 scatter_line_u = ScatterLine.new( '#FF0000', 3 )
 scatter_line_d = ScatterLine.new( '#FF0000', 3 )
 data = []
 data_u = []
 data_d = []

 x=0
 (@data_up.length).times do |h|
   data   << (ScatterValue.new(x,(@data_up[h] + @data_down[h])/ 2))
   data_u << (ScatterValue.new(x,@data_up[h]))
   data_d << (ScatterValue.new(x,@data_down[h]))
   x+=1
   end

 scatter_line.set_values(data);         chart.add_element(scatter_line)
 scatter_line_u.set_values(data_u);     chart.add_element(scatter_line_u)
 scatter_line_d.set_values(data_d);     chart.add_element(scatter_line_d)

 x = XAxis.new
 x.set_range(0,32,5)
 x.set_offset(false)
 chart.set_x_axis(x)

 y = YAxis.new
 y.set_range(-5,5,1)
 y.set_offset(true)
 chart.set_y_axis(y)

 render :text => chart.to_s
end
end

Radar chart lines

First attempt to offer something to my referring to the excellent tutorial by pullmonkey.com and harryseldon
here is the ruby in transposition of the third example of radar chart
radar chart lines

test_it_controller.rb

class TestItController < ApplicationController
 def index
   @graph1 = open_flash_chart_object(600,300,"/test_it/graph1_code")
 end

 def graph_code
   chart = OpenFlashChart.new
   chart.set_title(Title.new('Radar Chart'))

   values = [30,50,60,70,80,90,100,115,130,115,100,90,80,70,60,50]
   spokes = ['a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p']
   vals = []

   values.each_with_index do |value, i|
     tmp = DotValue.new( value, '#D41E47' )
     tmp.set_tooltip("#val#&ltbr%rtSpoke: #{spokes[i]}")
     vals.push(tmp)
     end
  
   line = LineHollow.new()
   line.set_values( vals )
   line.set_halo_size( 0 )
   line.set_width( 2 )
   line.set_dot_size( 6 )
   line.set_colour( '#FBB829' )
   line.set_key( 'Hearts', 10 )
   line.loop()


   # add the area object to the chart:
   chart.add_element(line)

   r = RadarAxis.new( 150 )
   r.set_steps(10)
   r.set_colour( '#DAD5E0' )
   r.set_grid_colour( '#EFEFEF' )
   chart.set_radar_axis( r )

   tooltip = Tooltip.new()
   tooltip.set_proximity()
   chart.set_tooltip( tooltip )

   chart.set_bg_colour( '#ffffff' )

   render :text => chart.to_s
 end
end