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module Rubyvis
# Alias for Rubyvis::Bar
def self.Bar
Rubyvis::Bar
end
# Represents a bar: an axis-aligned rectangle that can be stroked and
# filled. Bars are used for many chart types, including bar charts, histograms
# and Gantt charts. Bars can also be used as decorations, for example to draw a
# frame border around a panel; in fact, a panel is a special type (a subclass)
# of bar.
#
# Bars can be positioned in several ways. Most commonly, one of the four
# corners is fixed using two margins, and then the width and height properties
# determine the extent of the bar relative to this fixed location. For example,
# using the bottom and left properties fixes the bottom-left corner; the width
# then extends to the right, while the height extends to the top. As an
# alternative to the four corners, a bar can be positioned exclusively using
# margins; this is convenient as an inset from the containing panel, for
# example. See Mark for details on the prioritization of redundant
# positioning properties.
class Bar < Mark
def type # :nodoc:
"bar"
end
@properties=Mark.properties.dup
##
# :attr: width
# The width of the bar, in pixels. If the left position is specified, the bar
# extends rightward from the left edge; if the right position is specified, the
# bar extends leftward from the right edge.
##
# :attr: height
# The height of the bar, in pixels. If the bottom position is specified, the
# bar extends upward from the bottom edge; if the top position is specified,
# the bar extends downward from the top edge.
##
# :attr: line_width
# The width of stroked lines, in pixels; used in conjunction with
# stroke_style to stroke the bar's border.
##
# :attr: stroke_style
# The style of stroked lines; used in conjunction with line_width to
# stroke the bar's border. The default value of this property is nil, meaning bars are not stroked by default.
##
# :attr: fill_style
# The bar fill style; if non-nil, the interior of the bar is filled with the
# specified color. The default value of this property is a categorical color.
attr_accessor_dsl :width, :height, :line_width, [:stroke_style, lambda {|d| Rubyvis.color(d)}], [:fill_style, lambda {|d| Rubyvis.color(d)}]
# Default properties for bars. By default, there is no stroke and the fill
# style is a categorical color.
def self.defaults
a=Rubyvis.Colors.category20()
Bar.new.mark_extend(Mark.defaults).line_width(1.5).fill_style( lambda {
a.scale(self.parent.index)
})
end
end
end
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