Class: Rubyvis::Layout::Stack

Inherits:
Rubyvis::Layout show all
Defined in:
lib/rubyvis/layout/stack.rb

Instance Attribute Summary collapse

Attributes inherited from Panel

#_canvas, #children, #root

Attributes inherited from Mark

#_properties, #binds, #child_index, #parent, #proto, #root, #scale, #scene, #target

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Rubyvis::Layout

Stack, attr_accessor_dsl

Methods inherited from Panel

#add, #anchor, #bind, #build_instance, #children_inspect, #panel_build_implied, #to_svg, #type

Methods inherited from Bar

#type, #width

Methods inherited from Mark

#add, #anchor, attr_accessor_dsl, #bind, #build, #build_instance, #build_properties, #context, #context_apply, #context_clear, #cousin, #delete_index, #event, #extend, index, #index, index=, #index=, #index_defined?, #instance, #instances, #margin, #mark_anchor, #mark_bind, #mark_build_implied, #mark_build_instance, #properties, properties, property_method, #property_value, #render, scene, scene=, #sibling, stack, stack=, #type

Constructor Details

#initialize ⇒ Stack

Returns a new instance of Stack.



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# File 'lib/rubyvis/layout/stack.rb', line 14

def initialize
  super
  @none=lambda {nil}
  @prop = {"t"=> @none, "l"=> @none, "r"=> @none, "b"=> @none, "w"=> @none, "h"=> @none}
  @values=nil
  @_x=lambda {return 0}
  @_y=lambda {return 0}
  @_values=Rubyvis.identity
end

Instance Attribute Details

#_values ⇒ Object

Returns the value of attribute _values.



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# File 'lib/rubyvis/layout/stack.rb', line 9

def _values
  @_values
end

#_x ⇒ Object

Returns the value of attribute _x.



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# File 'lib/rubyvis/layout/stack.rb', line 9

def _x
  @_x
end

#_y ⇒ Object

Returns the value of attribute _y.



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# File 'lib/rubyvis/layout/stack.rb', line 9

def _y
  @_y
end

#prop ⇒ Object

Returns the value of attribute prop.



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# File 'lib/rubyvis/layout/stack.rb', line 9

def prop
  @prop
end

Class Method Details

.defaults ⇒ Object 



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# File 'lib/rubyvis/layout/stack.rb', line 11

def self.defaults
  Stack.new.extend(Layout.defaults).orient("bottom-left").offset("zero").layers([[]])
end

Instance Method Details

#build_implied(s) ⇒ Object 



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# File 'lib/rubyvis/layout/stack.rb', line 50

def build_implied(s)
  # puts "Build stack" if $DEBUG
  panel_build_implied(s)
  data = s.layers
  n = data.size
  m = nil
  orient = s.orient
  if orient =~/^(top|bottom)\b/
    horizontal=true
  else
    horizontal=false
  end
  h = self.parent.send(horizontal ? "height" : "width")
  x = []
  y = []
  dy = []
  
  #
  # Iterate over the data, evaluating the values, x and y functions. The
  # context in which the x and y psuedo-properties are evaluated is a
  # pseudo-mark that is a grandchild of this layout.
  #
  stack = Rubyvis::Mark.stack
  
  o = OpenStruct.new({:parent=> OpenStruct.new({:parent=> self})})
  stack.unshift(nil)
  values = []
  n.times {|i|
  dy[i] = []
  y[i] = []
  o.parent.index = i
  stack[0] = data[i]
  values[i] = self._values.js_apply(o.parent, stack);
  m = values[i].size if (i==0) 
  stack.unshift(nil)
  m.times {|j|
    stack[0] = values[i][j]
    o.index = j
    x[j] = self._x.js_apply(o, stack) if i==0
    dy[i][j] = self._y.js_apply(o, stack)
  }
  stack.shift()
  }
  stack.shift()
  
  # order
  _index=nil
  case (s.order) 
  when "inside-out" 
    max  = dy.map {|v| Rubyvis.max.index(v) }
    map  = pv.range(n).sort {|a,b| return max[a] - max[b]}
    sums = dy.map {|v| Rubyvis.sum(v)}
    top = 0
    bottom = 0
    tops = []
    bottoms = []
    n.times {|i|
      j = map[i]
      if (top < bottom) 
        top += sums[j];
        tops.push(j);
      else
        bottom += sums[j];
        bottoms.push(j);
      end
    }
    _index = bottoms.reverse+tops
    
  when "reverse"
    _index = Rubyvis.range(n - 1, -1, -1)
  else
    _index = Rubyvis.range(n)
  end
  
  #/* offset */
  case (s.offset) 
  when "silohouette"
    m.times {|j|
      o = 0;
      n.times {|i| 
        o += dy[i][j]
      }
      y[_index[0]][j] = (h - o) / 2.0;
    }
  
  when "wiggle"
    o = 0;
    n.times {|i|  o += dy[i][0] }
    
    y[_index[0]][0] = o = (h - o) / 2.0
    
    (1...m).each  {|j|
      s1 = 0
      s2 = 0
      dx = x[j] - x[j - 1]
      n.times {|i| s1 += dy[i][j]}
      n.times {|i|
        
        s3 = (dy[_index[i]][j] - dy[_index[i]][j - 1]) / (2.0 * dx)
        i.times {|k|
          s3 += (dy[_index[k]][j] - dy[_index[k]][j - 1]) / dx.to_f
        }
        s2 += s3 * dy[_index[i]][j]
      }
      o -= (s1!=0) ? s2 / s1.to_f * dx : 0
      y[_index[0]][j] = o
      
    }
  when "expand"
    m.times {|j|
      y[_index[0]][j] = 0
      
      k = 0
      n.times {|i|k += dy[i][j]}
      if (k!=0) 
        k = h / k.to_f
        n.times {|i| dy[i][j] *= k}
      else 
        k = h / n.to_f
        n.times { dy[i][j] = k}
      end
    }
  else
    m.times {|j| y[_index[0]][j] = 0}
  end
  
  # Propagate the offset to the other series. */
  m.times {|j|
  o = y[_index[0]][j]
  (1...n).each {|i|
    
    o += dy[_index[i - 1]][j]
    y[_index[i]][j] = o
  }
  }
  
  # /* Find the property definitions for dynamic substitution. */
  
  i = orient.index("-")
  pdy = horizontal ? "h" : "w"
  px = i < 0 ? (horizontal ? "l" : "b") : orient[i + 1,1]
  py = orient[0,1]
  
  @values=values
  
  @prop.each {|k,v|
    @prop[k]=@none
  }
  # puts "stack: x:#{px}, y:#{py}, dy:#{pdy}" if $DEBUG
  @prop[px] =lambda {|i1,j| x[j]}
  @prop[py] =lambda {|i1,j| y[i1][j]}
  @prop[pdy]=lambda {|i1,j| dy[i1][j]}  
end

#layer ⇒ Object 



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# File 'lib/rubyvis/layout/stack.rb', line 204

def layer
  that=self
  value = Rubyvis::Mark.new().data(lambda { that.values[self.parent.index] }).top(proxy("t")).left(proxy("l")).right(proxy("r")).
    bottom(proxy("b")).
  width(proxy("w")).
  height(proxy("h"))
  
  class << value
    def that=(v)
      @that = v
    end
    def add(type)
      that  = @that
      that.add( Rubyvis.Panel ).data(lambda { that.layers() }).add(type).extend( self )
    end
  end
  value.that=self
  return value
end

#proxy(name) ⇒ Object 



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# File 'lib/rubyvis/layout/stack.rb', line 41

def proxy(name)
  that=self
  return lambda {
    a=that.prop[name].js_call(self, self.parent.index, self.index);
    puts "proxy(#{name}): #{a}" if $DEBUG
    a
  }
end

#values(f = nil) ⇒ Object 



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# File 'lib/rubyvis/layout/stack.rb', line 31

def values(f=nil)
  if f.nil?
    @values
  else
    @_values=Rubyvis.functor(f)
    return self
  end
end

#x(f) ⇒ Object 



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# File 'lib/rubyvis/layout/stack.rb', line 23

def x(f)
  @_x=Rubyvis.functor(f)
  return self
end

#y(f) ⇒ Object 



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# File 'lib/rubyvis/layout/stack.rb', line 27

def y(f)
  @_y=Rubyvis.functor(f)
  return self
end