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require File.join(File.expand_path(File.dirname(__FILE__)), "spec_helper")
module TransparencyHelper
def make_transparent(opacity, stroke_opacity=opacity)
@pdf.transparent(opacity, stroke_opacity) do
yield if block_given?
end
end
end
describe "Document with transparency" do
include TransparencyHelper
it "the PDF version should be at least 1.4" do
create_pdf
make_transparent(0.5)
str = @pdf.render
str[0,8].should == "%PDF-1.4"
end
it "a new extended graphics state should be created for "+
"each unique transparency setting" do
create_pdf
make_transparent(0.5, 0.2) do
make_transparent(0.5, 0.75)
end
extgstates = PDF::Inspector::ExtGState.analyze(@pdf.render).extgstates
extgstates.length.should == 2
end
it "a new extended graphics state should not be created for "+
"each duplicate transparency setting" do
create_pdf
make_transparent(0.5, 0.75) do
make_transparent(0.5, 0.75)
end
extgstates = PDF::Inspector::ExtGState.analyze(@pdf.render).extgstates
extgstates.length.should == 1
end
it "setting the transparency with only one parameter sets the transparency"+
" for both the fill and the stroke" do
create_pdf
make_transparent(0.5)
extgstate = PDF::Inspector::ExtGState.analyze(@pdf.render).extgstates[0]
extgstate[:opacity].should == 0.5
extgstate[:stroke_opacity].should == 0.5
end
it "setting the transparency with a numerical parameter and "+
"a :stroke should set the fill transparency to the numerical parameter "+
"and the stroke transparency to the option" do
create_pdf
make_transparent(0.5, 0.2)
extgstate = PDF::Inspector::ExtGState.analyze(@pdf.render).extgstates[0]
extgstate[:opacity].should == 0.5
extgstate[:stroke_opacity].should == 0.2
end
it "should enforce the valid range of 0.0 to 1.0" do
create_pdf
make_transparent(-0.5, -0.2)
extgstate = PDF::Inspector::ExtGState.analyze(@pdf.render).extgstates[0]
extgstate[:opacity].should == 0.0
extgstate[:stroke_opacity].should == 0.0
create_pdf
make_transparent(2.0, 3.0)
extgstate = PDF::Inspector::ExtGState.analyze(@pdf.render).extgstates[0]
extgstate[:opacity].should == 1.0
extgstate[:stroke_opacity].should == 1.0
end
describe "with more than one page" do
include TransparencyHelper
it "the extended graphic state resource should be added to both pages" do
create_pdf
make_transparent(0.5, 0.2)
@pdf.start_new_page
make_transparent(0.5, 0.2)
extgstates = PDF::Inspector::ExtGState.analyze(@pdf.render).extgstates
extgstate = extgstates[0]
extgstates.length.should == 2
extgstate[:opacity].should == 0.5
extgstate[:stroke_opacity].should == 0.2
end
end
end
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