Class: Scruffy::Layers::AllSmiles

Inherits:
Base
  • Object
show all
Defined in:
lib/scruffy/layers/all_smiles.rb

Overview

Scruffy::Layers::AllSmiles

Author

Brasten Sager

Date

August 8th, 2006

The AllSmiles graph consists of smiley faces for data points, with smiles or frowns depending upon their relative location on the graph. The highest point is crowned with a wizard hat. The Wizard Smiley eventually become ‘Scruffy’, our mascot.

I don’t know why.

This graph only looks decent in SVG mode. If you’re rasterizing the graph with ImageMagick, you must use the :complexity => :minimal option on Graph#render. This will make the graph look really nasty, but still better than if you try to rasterize with all the gradients in place.

Instance Attribute Summary collapse

Attributes inherited from Base

#color, #complexity, #height, #max_value, #min_value, #opacity, #options, #points, #preferred_color, #relevant_data, #title, #width

Instance Method Summary collapse

Methods inherited from Base

#bottom_value, #legend_data, #relevant_data?, #render, #sum_values, #top_value

Constructor Details

#initialize(options = {}) ⇒ AllSmiles

Returns a new AllSmiles graph.

Options:

standalone

If set to true, dashed lines under smilies run vertically, like bar graphs. If false (default), dashed lines run from smiley to smiley, like a line-graph.



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# File 'lib/scruffy/layers/all_smiles.rb', line 24

def initialize(options = {})
  super
  @standalone = options[:standalone] || false
end

Instance Attribute Details

#standalone ⇒ Object

Returns the value of attribute standalone.



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# File 'lib/scruffy/layers/all_smiles.rb', line 17

def standalone
  @standalone
end

Instance Method Details

#draw(svg, coords, options = {}) ⇒ Object

Renders graph.



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# File 'lib/scruffy/layers/all_smiles.rb', line 30

def draw(svg, coords, options={})

  hero_smiley = nil
  coords.each { |c| hero_smiley = c.last if (hero_smiley.nil? || c.last < hero_smiley) }

  svg.defs {
    svg.radialGradient(:id => 'SmileyGradient', :cx => '50%', 
                       :cy => '50%', :r => '50%', :fx => '30%', :fy => '30%') {
                       
        svg.stop(:offset => '0%', 'stop-color' => '#FFF')
        svg.stop(:offset => '20%', 'stop-color' => '#FFC')
        svg.stop(:offset => '45%', 'stop-color' => '#FF3')
        svg.stop(:offset => '60%', 'stop-color' => '#FF0')
        svg.stop(:offset => '90%', 'stop-color' => '#990')
        svg.stop(:offset => '100%', 'stop-color' => '#220')
    }
    svg.radialGradient(:id => 'HeroGradient', :cx => '50%', 
                       :cy => '50%', :r => '50%', :fx => '30%', :fy => '30%') {
                       
        svg.stop(:offset => '0%', 'stop-color' => '#FEE')
        svg.stop(:offset => '20%', 'stop-color' => '#F0E0C0')
        svg.stop(:offset => '45%', 'stop-color' => '#8A2A1A')
        svg.stop(:offset => '60%', 'stop-color' => '#821')
        svg.stop(:offset => '90%', 'stop-color' => '#210')
    }
    svg.radialGradient(:id => 'StarGradient', :cx => '50%', 
                       :cy => '50%', :r => '50%', :fx => '30%', :fy => '30%') {
                       
        svg.stop(:offset => '0%', 'stop-color' => '#FFF')
        svg.stop(:offset => '20%', 'stop-color' => '#EFEFEF')
        svg.stop(:offset => '45%', 'stop-color' => '#DDD')
        svg.stop(:offset => '60%', 'stop-color' => '#BBB')
        svg.stop(:offset => '90%', 'stop-color' => '#888')
    }
  }
      
  unless standalone
    svg.polyline( :points => stringify_coords(coords).join(' '), :fill => 'none', 
                  :stroke => '#660', 'stroke-width' => scaled(10), 'stroke-dasharray' => "#{scaled(10)}, #{scaled(10)}" )
  end

  # Draw smilies.
  coords.each do |coord|
    if standalone
      svg.line( :x1 => coord.first, :y1 => coord.last, :x2 => coord.first, :y2 => height, :fill => 'none', 
                    :stroke => '#660', 'stroke-width' => scaled(10), 'stroke-dasharray' => "#{scaled(10)}, #{scaled(10)}" )
    end
    svg.circle( :cx => coord.first + scaled(2), :cy => coord.last + scaled(2), :r => scaled(15), 
                :fill => 'black', :stroke => 'none', :opacity => 0.4)
    svg.circle( :cx => coord.first, :cy => coord.last, :r => scaled(15), 
                :fill => (complexity == :minimal ? 'yellow' : 'url(#SmileyGradient)'), :stroke => 'black', 'stroke-width' => scaled(1) )
    svg.line( :x1 => (coord.first - scaled(3)), 
              :x2 => (coord.first - scaled(3)),
              :y1 => (coord.last),
              :y2 => (coord.last  - scaled(7)), :stroke => 'black', 'stroke-width' => scaled(1.4) )
    svg.line( :x1 => (coord.first + scaled(3)), 
              :x2 => (coord.first + scaled(3)),
              :y1 => (coord.last),
              :y2 => (coord.last  - scaled(7)), :stroke => 'black', 'stroke-width' => scaled(1.4) )
            
  
    # Some minor mathematics for the smile/frown
    percent = 1.0 - (coord.last.to_f / height.to_f)
    corners = scaled(8 - (5 * percent))
    anchor  = scaled((20 * percent) - 5)
    
    # Draw the mouth
    svg.path( :d => "M#{coord.first - scaled(9)} #{coord.last + corners} Q#{coord.first} #{coord.last + anchor} #{coord.first + scaled(9)} #{coord.last + corners}",
              :stroke => 'black', 'stroke-width' => scaled(1.4), :fill => 'none' )
            
            
    # Wizard hat for hero smiley.
    if coord.last == hero_smiley
      svg.ellipse(:cx => coord.first, :cy => (coord.last - scaled(13)), 
                  :rx => scaled(17), :ry => scaled(6.5), :fill => (complexity == :minimal ? 'purple' : 'url(#HeroGradient)'), :stroke => 'black', 'stroke-width' => scaled(1.4) )
    
      svg.path(:d => "M#{coord.first} #{coord.last - scaled(60)} " +
                     "L#{coord.first + scaled(10)} #{coord.last - scaled(14)} " +
                     "C#{coord.first + scaled(10)},#{coord.last - scaled(9)} #{coord.first - scaled(10)},#{coord.last - scaled(9)} #{coord.first - scaled(10)},#{coord.last - scaled(14)}" +
                     "L#{coord.first} #{coord.last - scaled(60)}",
                :stroke => 'black', 'stroke-width' => scaled(1.4), :fill => (complexity == :minimal ? 'purple' : 'url(#HeroGradient)'))

      svg.path(:d =>  "M#{coord.first - scaled(4)} #{coord.last - scaled(23)}" +
                      "l-#{scaled(2.5)} #{scaled(10)} l#{scaled(7.5)} -#{scaled(5)} l-#{scaled(10)} 0 l#{scaled(7.5)} #{scaled(5)} l-#{scaled(2.5)} -#{scaled(10)}", :stroke => 'none', :fill => (complexity == :minimal ? 'white': 'url(#StarGradient)') )
      svg.path(:d =>  "M#{coord.first + scaled(2)} #{coord.last - scaled(30)}" +
                      "l-#{scaled(2.5)} #{scaled(10)} l#{scaled(7.5)} -#{scaled(5)} l-#{scaled(10)} 0 l#{scaled(7.5)} #{scaled(5)} l-#{scaled(2.5)} -#{scaled(10)}", :stroke => 'none', :fill => (complexity == :minimal ? 'white': 'url(#StarGradient)') )
      svg.path(:d =>  "M#{coord.first - scaled(2)} #{coord.last - scaled(33)}" +
                      "l-#{scaled(1.25)} #{scaled(5)} l#{scaled(3.75)} -#{scaled(2.5)} l-#{scaled(5)} 0 l#{scaled(3.75)} #{scaled(2.5)} l-#{scaled(1.25)} -#{scaled(5)}", :stroke => 'none', :fill => 'white' )
      svg.path(:d =>  "M#{coord.first - scaled(2.2)} #{coord.last - scaled(32.7)}" +
                      "l-#{scaled(1.25)} #{scaled(5)} l#{scaled(3.75)} -#{scaled(2.5)} l-#{scaled(5)} 0 l#{scaled(3.75)} #{scaled(2.5)} l-#{scaled(1.25)} -#{scaled(5)}", :stroke => 'none', :fill => (complexity == :minimal ? 'white': 'url(#StarGradient)') )
      svg.path(:d =>  "M#{coord.first + scaled(4.5)} #{coord.last - scaled(20)}" +
                      "l-#{scaled(1.25)} #{scaled(5)} l#{scaled(3.75)} -#{scaled(2.5)} l-#{scaled(5)} 0 l#{scaled(3.75)} #{scaled(2.5)} l-#{scaled(1.25)} -#{scaled(5)}", :stroke => 'none', :fill => (complexity == :minimal ? 'white': 'url(#StarGradient)') )
      svg.path(:d =>  "M#{coord.first} #{coord.last - scaled(40)}" +
                      "l-#{scaled(1.25)} #{scaled(5)} l#{scaled(3.75)} -#{scaled(2.5)} l-#{scaled(5)} 0 l#{scaled(3.75)} #{scaled(2.5)} l-#{scaled(1.25)} -#{scaled(5)}", :stroke => 'none', :fill => (complexity == :minimal ? 'white': 'url(#StarGradient)') )

    end

  end
end

#scaled(pt) ⇒ Object

Legacy (4 days old). Removed scaled from layout engine, changed to #relative, with different math involved. Translate here so I don’t have to entirely redo this graph.



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# File 'lib/scruffy/layers/all_smiles.rb', line 133

def scaled(pt)
  relative(pt) / 2
end