Class: TagCloud

Inherits:
Object
  • Object
show all
Defined in:
lib/sdb_dal/tag_cloud.rb

Overview

TagCloud.rb July 6, 2007

Instance Method Summary collapse

Constructor Details

#initialize(tag_data) ⇒ TagCloud

Returns a new instance of TagCloud.



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# File 'lib/sdb_dal/tag_cloud.rb', line 18

def initialize(tag_data)
 
  @histogram=tag_data.inject(Hash.new(0)){|hash,x| hash[x.tag_name]+=1;hash}
            
  @tag_data=tag_data.sort_by{|x|[@histogram[x.tag_name],x.tag_name]}
 calculate_max_min
  while @histogram.size>40
      @histogram.reject!{|key, value| value == @min }
      calculate_max_min
  end
  @normal_histogram={}
  if tag_data.length>0
    range=@max-@min
    for key in @histogram.keys
      if range==0
         @normal_histogram[key]=2
      else
         @normal_histogram[key]=((@histogram[key]-@min)*4)/range
      end
     
    end
    @tags=@histogram.keys
    @tags.sort!
  else 
    @tags=[]
  end
end

Instance Method Details

#calculate_max_min ⇒ Object 



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# File 'lib/sdb_dal/tag_cloud.rb', line 6

def calculate_max_min
     @max=nil
  @min=nil
     for key in @histogram.keys
    if @min==nil || @histogram[key]<@min
      @min=@histogram[key]
    end
    if @max==nil || @histogram[key]>@max
      @max=@histogram[key]
    end
  end
end

#get_count(tag_name) ⇒ Object 



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# File 'lib/sdb_dal/tag_cloud.rb', line 48

def get_count(tag_name)
  return @histogram[tag_name]
end

#get_magnitude(tag_name) ⇒ Object 



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# File 'lib/sdb_dal/tag_cloud.rb', line 51

def get_magnitude(tag_name)
  return @normal_histogram[tag_name]
end

#tags ⇒ Object 



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# File 'lib/sdb_dal/tag_cloud.rb', line 45

def tags
  return @tags
end