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module Rubyvis
# Alias por Rubyvis::Dot
def self.Dot
Rubyvis::Dot
end
# Represents a dot; a dot is simply a sized glyph centered at a given
# point that can also be stroked and filled. The <tt>size</tt> 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.
class Dot < Mark
# Type of mark
def type
"dot"
end
@properties=Mark.properties.dup
##
# :attr: shape_size
# The size of the shape, in square pixels. Square pixels are used such that the
# area of the shape is linearly proportional to the value of the
# <tt>shape_size</tt> property, facilitating representative encodings. This is
# an alternative to using shape_radius
#
##
# :attr: shape_radius
# The radius of the shape, in pixels. This is an alternative to using
# shape_size
#
##
# :attr: shape
# The shape name. Several shapes are supported:<ul>
#
# <li>cross
# <li>triangle
# <li>diamond
# <li>square
# <li>circle
# <li>tick
# <li>bar
#
# </ul>These shapes can be further changed using the angle() property;
# for instance, a cross can be turned into a plus by rotating. Similarly, the
# tick, which is vertical by default, can be rotated horizontally. Note that
# some shapes (cross and tick) do not have interior areas, and thus do not
# support fill style meaningfully.
#
# <p>Note: it may be more natural to use the Rule mark for
# horizontal and vertical ticks. The tick shape is only necessary if angled
# ticks are needed.
##
# :attr: shape_angle
# The shape rotation angle, in radians. Used to rotate shapes, such as to turn
# a cross into a plus.
##
# :attr: line_width
# The width of stroked lines, in pixels; used in conjunction with
# +stroke_style+ to stroke the dot's shape.
##
# :attr: stroke_style
# The style of stroked lines; used in conjunction with +line_width+ to
# stroke the dot's shape. The default value of this property is a categorical color. See Rubyvis.color()
##
# :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()
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)}]
# 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.
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
# 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 <i>inside</i> 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.
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
# @private Sets radius based on size or vice versa.
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
end
end
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