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require File.expand_path(File.dirname(__FILE__)+"/spec_helper.rb")
describe Rubyvis::Scale::Linear do
if Rubyvis::JohnsonLoader.available?
context "direct protovis API comparison" do
before(:all) do
@rt= Rubyvis::JohnsonLoader.new().runtime
end
before do
@h=280
@h_dom=1000
@y = Rubyvis.Scale.linear(0, @h_dom).range(0,@h)
@rt[:h_dom] = @h_dom
@rt[:h] = @h
@y_js=@rt.evaluate("y=pv.Scale.linear(0, h_dom).range(0,h)")
@v1,@v2,@v3=rand(),rand()+3,rand()+5
@rt[:v1]=@v1
@rt[:v2]=@v2
@rt[:v3]=@v3
end
it "domain() implemented equally" do
@y.domain(@v1)
@rt.evaluate("y.domain(v1)")
@y.domain.should==@rt.evaluate("y.domain()").to_a
@y.domain(@v1,@v2,@v3)
@rt.evaluate("y.domain(v1,v2,v3)")
@y.domain.should==@rt.evaluate("y.domain()").to_a
end
it "scale() implemented equally for complex domain" do
@y.domain(@v1,@v2,@v3)
@rt.evaluate("y.domain(v1,v2,v3)")
@y.scale(@v1+1).should==@rt.evaluate("y(v1+1)")
@y.scale(@v2+1).should==@rt.evaluate("y(v2+1)")
@y.scale(@v3+1).should==@rt.evaluate("y(v3+1)")
end
it "invert() implemented equally" do
@y.domain(@v1,@v2,@v3)
@rt.evaluate("y.domain(v1,v2,v3)")
@y.invert(@v1+1).should==@rt.evaluate("y.invert(v1+1)")
@y.invert(@v2+1).should==@rt.evaluate("y.invert(v2+1)")
@y.invert(@v3+1).should==@rt.evaluate("y.invert(v3+1)")
end
it "ticks() implemented equally for numbers" do
@y.ticks.should==@rt.evaluate("y.ticks()").to_a
(5..20).each {|i|
@rt[:i]=i
@y.ticks(i).should==@rt.evaluate("y.ticks(i)").to_a
}
end
it "nice() implemented equally" do
@y.domain(@v1,@v2)
@rt.evaluate("y.domain(v1,v2)")
@y.nice
@rt.evaluate("y.nice()")
@y.domain.should==@rt.evaluate("y.domain()").to_a
end
end
end
it "should be created as Javascript" do
h=280
y = Rubyvis.Scale.linear(0, 1500)
end
before do
@h=280
@h_dom=1000
@y = Rubyvis.Scale.linear(0, @h_dom).range(0,@h)
end
it "y should be a Scale" do
@y.should be_a(Rubyvis::Scale::Linear)
end
it "should respond to domain" do
@y.domain.should==[0, 1000]
@y.domain(1)
@y.domain.should==[1,1]
@y.domain(1,100,300)
@y.domain.should==[1,100,300]
end
it "should respond to range" do
@y.range.should==[0, 280]
@y.range(1)
@y.range.should==[1,1]
@y.range(1,100,300)
@y.range.should==[1,100,300]
end
it "should returns correct scale" do
@y.scale(@h_dom).should==280
@y[@h_dom].should==280
val=20
@y.scale(val).should be_within( 0.001).of(val.quo(@h_dom)*@h.to_f)
end
it "should return correct scale when values are extracted from data " do
data = pv.range(0, 10, 0.1).map {|x| OpenStruct.new({:x=> x, :y=> Math.sin(x) + 2+rand()}) }
w = 400
h = 200
x = pv.Scale.linear(data, lambda {|d| d.x}).range(0, w)
y = pv.Scale.linear(data, lambda {|d| d.y}).range(0, h)
lambda {y.scale 0.5}.should_not raise_error
end
it "should returns correct invert" do
@y.invert(100).should be_within( 0.001).of(357.1428)
@y.invert(200).should be_within( 0.001).of(714.2857)
end
it "should returns correct ticks" do
@y.ticks.should==[0,100,200,300,400,500,600,700,800,900,1000]
@y.ticks(13).should==[0,100,200,300,400,500,600,700,800,900,1000]
@y.ticks(5).should==[0,200,400,600,800,1000]
end
it "should return correct tick when domain is a scalar" do
@y.domain(1,1,1).ticks.should==[1]
end
it "should nice nicely" do
@y.domain([0.20147987687960267, 0.996679553296417])
@y.nice
@y.domain().should==[0.2,1]
end
it "should returns correct tick_format" do
@y.tick_format.should be_instance_of Proc
@y.tick_format.call( 2).should=='2'
@y.tick_format.call(2.0).should=='2'
@y.tick_format.call(2.1).should=='2.1'
@y.tick_format.call("a").should==''
end
it "should return correct tick_format for small numbers" do
@y.domain(0.00001,0.0001)
@y.range(0.000001,0.0001)
@y.ticks.should==[1.quo(100000), 1.quo(50000), 3.quo(100000), 1.quo(25000), 1.quo(20000), 3.quo(50000), 7.quo(100000), 1.quo(12500), 9.quo(100000), 1.quo(10000)]
@y.tick_format.call(0.2).should=='0.20000'
end
it "should return correct by" do
by=@y.by(lambda {|v| v.value})
a=OpenStruct.new({:value=>rand})
by.call(a).should==@y[a.value]
end
end
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