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# = Area Interpolation
# This example show the 5 types of interpolation available for areas:
# * linear
# * step-before
# * step-after
# * basis
# * cardinal
#
# See also "Line Interpolation":line_interpolation.html
$:.unshift(File.dirname(__FILE__)+"/../../lib")
require 'rubyvis'
data = Rubyvis.range(0, 10, 0.5).map {|x|
OpenStruct.new({:x=> x, :y=> Math.sin(x) + 2+rand()*0.3})
}
p_w=200
p_h=150
#p data
w = 20+p_w*2
h = 20+p_h*3
x = Rubyvis.Scale.linear(data, lambda {|d| d.x}).range(0, p_w-30)
y = Rubyvis.Scale.linear(data, lambda {|d| d.y}).range(0, p_h-20);
interpolations=["linear","step-before","step-after", "basis", "cardinal"]
vis = Rubyvis::Panel.new do |pan|
pan.width w
pan.height h
pan.bottom 20
pan.left 20
pan.right 10
pan.top 5
interpolations.each_with_index do |inter,i|
n=i%2
m=(i/2).floor
pan.panel do
left(n*(p_w+10))
top(m*(p_h+10))
width p_w
height p_h
label(:anchor=>'top') do
text(inter)
end
# uses 'a' as reference inside block
# to use data method with data variable
area do |a|
a.data data
a.left {|d| x.scale(d.x)}
a.height {|d| y.scale(d.y)}
a.bottom 1
a.interpolate inter
end
end
end
end
vis.render();
puts vis.to_svg
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