Class: Statsample::Graph::SvgBoxplot

Inherits:
SVG::Graph::Bar
  • Object
show all
Defined in:
lib/statsample/graph/svgboxplot.rb

Overview

:nodoc:

Instance Method Summary collapse

Constructor Details

#initialize(config = {}) ⇒ SvgBoxplot

Returns a new instance of SvgBoxplot.



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# File 'lib/statsample/graph/svgboxplot.rb', line 4

def initialize(config={})
    config[:fields]=["dummy"]
    super(config)
end

Instance Method Details

#draw_data ⇒ Object 



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# File 'lib/statsample/graph/svgboxplot.rb', line 30

def draw_data
minvalue = min_value
fieldwidth = field_width
unit_size =  (@graph_height.to_f - font_size*2*top_font) / 
              (get_y_labels.max - get_y_labels.min)
bargap = bar_gap ? (fieldwidth < 10 ? fieldwidth / 2 : 10) : 0

bar_width = fieldwidth - bargap
bar_width /= @data.length if stack == :side
x_mod = (@graph_width-bargap) / 2 - (stack==:side ? bar_width/2 : 0)

bottom = @graph_height

field_count = 0
for dataset in @data

# cases (assume 0 = +ve):
#   value  min  length
#    +ve   +ve  value - min
#    +ve   -ve  value - 0
#    -ve   -ve  value.abs - 0

min=dataset[:data].min
max=dataset[:data].max
median=dataset[:vector].median
q1=dataset[:vector].percentil(25)
q3=dataset[:vector].percentil(75)
iqr=q3-q1
left = (fieldwidth * field_count)
#length = (value.abs - (minvalue > 0 ? minvalue : 0)) * unit_size
# top is 0 if value is negative
top_wisk=(q3+iqr*1.5 < max) ? q3+iqr*1.5 : max
down_wisk= (q1-iqr*1.5 > min) ? q1-iqr*1.5 : min

top=@graph_height-((top_wisk-minvalue)*unit_size)
down=@graph_height-((down_wisk-minvalue)*unit_size)

median_bar=@graph_height-((median-minvalue)*unit_size)
middle= left+(bar_width / 2)
left_whis=left+(bar_width * 0.4)
rigth_whis=left+(bar_width*0.6)
left_rect= left+(bar_width * 0.25)
rigth_rect = left+ (bar_width * 0.75)
top_rect=@graph_height-((q3-minvalue)*unit_size)
height_rect=iqr*unit_size
path="M #{left_whis} #{top} H #{rigth_whis} M #{middle} #{top} V #{down} M #{left_whis} #{down} H #{rigth_whis} M #{left_rect} #{median_bar} H #{rigth_rect}"


# Marcamos Outliers
if top_wisk!=max or down_wisk!=min
    dataset[:vector].valid_data.each{|d|
        if(d<down_wisk) or (d>top_wisk)
        y_out=(@graph_height - (d -minvalue)*unit_size).to_s
            @graph.add_element( "circle", {
             "cx" => (middle).to_s,
             "cy" => y_out,
            "r" => "3",
            "class" => "dataPoint#{field_count+1}"
            })
            @graph.add_element( "text", {
            "x" => (middle+20).to_s,
            "y" => y_out,
            "class" => "dataPointLabel",
            "style" => "#{style} stroke: #000;"
            }).text = d.to_s                    end
    }
end

@graph.add_element( "rect", { "x" => left_rect.to_s, "y" => top_rect.to_s, "width" => (bar_width / 2).to_s, "height" => (height_rect).to_s, "class" => "fill#{field_count+1}"})

@graph.add_element("path",{"d"=>path, "style"=>"stroke:black;stroke-width:2"})

field_count += 1
end
       
end

#get_x_labels ⇒ Object 



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# File 'lib/statsample/graph/svgboxplot.rb', line 8

def get_x_labels
    @data.collect{|d|
        d[:title]
    }
end

#min_value ⇒ Object 



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# File 'lib/statsample/graph/svgboxplot.rb', line 14

def min_value
    min = 0
    if min_scale_value.nil? 
        min = @data.collect{|x| x[:data].min}.min
        if min > 0
            if min > 10
                min=min-2
            else
                min=0
            end
        end
    else
        min = min_scale_value
    end
    return min
end