Class: Rubyvis::Dot

Inherits:
Mark show all
Defined in:
lib/rubyvis/mark/dot.rb

Overview

Represents a dot; a dot is simply a sized glyph centered at a given point that can also be stroked and filled. The size property is proportional to the area of the rendered glyph to encourage meaningful visual encodings. Dots can visually encode up to eight dimensions of data, though this may be unwise due to integrality. See Mark for details on the prioritization of redundant positioning properties.

Instance Attribute Summary

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 Mark

#add, #area, attr_accessor_dsl, #bar, #bind, #build, #build_instance, #build_properties, #context, #context_apply, #context_clear, #cousin, #delete_index, #dot, #event, #execute, #first, #image, index, #index, index=, #index=, #index_defined?, #initialize, #instance, #instances, #label, #last, #layout_arc, #layout_cluster, #layout_grid, #layout_horizon, #layout_indent, #layout_matrix, #layout_pack, #layout_partition, #layout_partition_fill, #layout_stack, #layout_tree, #layout_treemap, #line, #margin, #mark_anchor, #mark_bind, #mark_build_implied, #mark_build_instance, #mark_build_properties, #mark_extend, mark_method, #panel, #properties, properties, property_method, #property_value, #render, #rule, scene, scene=, #sibling, stack, stack=, #wedge

Constructor Details

This class inherits a constructor from Rubyvis::Mark

Class Method Details

.defaults ⇒ Object

Default properties for dots. By default, there is no fill and the stroke style is a categorical color. The default shape is “circle” with radius 4.5.



80
81
82
83
 
# File 'lib/rubyvis/mark/dot.rb', line 80

def self.defaults()
  a=Rubyvis::Colors.category10
  Dot.new().mark_extend(Mark.defaults).shape("circle"). line_width(1.5). stroke_style(lambda {a.scale(self.parent.index)})
end

Instance Method Details

#anchor(name) ⇒ Object

Constructs a new dot anchor with default properties. Dots support five different anchors:<ul>

<li>top <li>left <li>center <li>bottom <li>right

</ul>In addition to positioning properties (left, right, top bottom), the anchors support text rendering properties (text-align, text-baseline). Text is rendered to appear outside the dot. Note that this behavior is different from other mark anchors, which default to rendering text inside the mark.

<p>For consistency with the other mark types, the anchor positions are defined in terms of their opposite edge. For example, the top anchor defines the bottom property, such that a bar added to the top anchor grows upward.



101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
 
# File 'lib/rubyvis/mark/dot.rb', line 101

def anchor(name)
  mark_anchor(name).left(lambda {
    s=scene.target[self.index]
    case self.name
      when 'bottom' then s.left;
      when 'top' then s.left;
      when 'center' then s.left;
      when 'left' then nil;
      else
        s.left+s.shape_radius
    end
  }).right(lambda {
    s=scene.target[self.index]
    self.name()=='left' ? s.right+s.shape_radius : nil
  }).top(lambda {
    s=scene.target[self.index]
    case self.name
      when 'left' then  s.top;
      when 'right' then s.top;
      when 'center' then s.top;
      when 'top' then nil;
      else
        s.top+s.shape_radius
    end
  }).bottom(lambda {
    s=scene.target[self.index]
    self.name()=='top' ? s.bottom+s.shape_radius : nil
  }).text_align(lambda {
    case self.name
      when 'left' then  'right';
      when 'bottom' then 'center';
      when 'top' then 'center';
      when 'center' then 'center';
      else
        'left'
    end
  }).text_baseline( lambda {
    case self.name
      when 'right' then  'middle';
      when 'left' then 'middle';
      when 'center' then 'middle';
      when 'bottom' then 'top';
      else
        'bottom'
    end
  
  })
end

#build_implied(s) ⇒ Object 



152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
 
# File 'lib/rubyvis/mark/dot.rb', line 152

def build_implied(s) # :nodoc:
  r = s.shape_radius
  z = s.shape_size
  if (r.nil?) 
    if (z.nil?) 
      s.shape_size = 20.25;
      s.shape_radius = 4.5;
    else
      s.shape_radius = Math.sqrt(z)
    end
  elsif (z.nil?) 
    s.shape_size = r * r;
  end
  mark_build_implied(s)
end

#shape ⇒ Object

:attr: fill_style The fill style; if non-nil, the interior of the dot is filled with the specified color. The default value of this property is nil, meaning dots are not filled by default. See Rubyvis.color()



77
 
# File 'lib/rubyvis/mark/dot.rb', line 77

attr_accessor_dsl :shape, :shape_angle, :shape_radius, :shape_size, :line_width, [:stroke_style, lambda {|d| Rubyvis.color(d)}], [:fill_style, lambda {|d| Rubyvis.color(d)}]

#type ⇒ Object

Type of mark



14
15
16
 
# File 'lib/rubyvis/mark/dot.rb', line 14

def type
  "dot"
end