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require 'spec_helper'
describe Prawn::Graphics::Transparency do
def make_transparent(opacity, stroke_opacity = opacity)
pdf.transparent(opacity, stroke_opacity) do
yield if block_given?
end
end
let(:pdf) { create_pdf }
it 'the PDF version should be at least 1.4' do
make_transparent(0.5)
str = pdf.render
expect(str[0, 8]).to eq('%PDF-1.4')
end
it 'a new extended graphics state should be created for ' \
'each unique transparency setting' do
make_transparent(0.5, 0.2) do
make_transparent(0.5, 0.75)
end
extgstates = PDF::Inspector::ExtGState.analyze(pdf.render).extgstates
expect(extgstates.length).to eq(2)
end
it 'a new extended graphics state should not be created for ' \
'each duplicate transparency setting' do
make_transparent(0.5, 0.75) do
make_transparent(0.5, 0.75)
end
extgstates = PDF::Inspector::ExtGState.analyze(pdf.render).extgstates
expect(extgstates.length).to eq(1)
end
it 'setting the transparency with only one parameter sets the ' \
'transparency for both the fill and the stroke' do
make_transparent(0.5)
extgstate = PDF::Inspector::ExtGState.analyze(pdf.render).extgstates[0]
expect(extgstate[:opacity]).to eq(0.5)
expect(extgstate[:stroke_opacity]).to eq(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
make_transparent(0.5, 0.2)
extgstate = PDF::Inspector::ExtGState.analyze(pdf.render).extgstates[0]
expect(extgstate[:opacity]).to eq(0.5)
expect(extgstate[:stroke_opacity]).to eq(0.2)
end
it 'does not allow negative values' do
make_transparent(-0.5, -0.2)
extgstate = PDF::Inspector::ExtGState.analyze(pdf.render).extgstates[0]
expect(extgstate[:opacity]).to eq(0.0)
expect(extgstate[:stroke_opacity]).to eq(0.0)
end
it 'does not allow too big values' do
make_transparent(2.0, 3.0)
extgstate = PDF::Inspector::ExtGState.analyze(pdf.render).extgstates[0]
expect(extgstate[:opacity]).to eq(1.0)
expect(extgstate[:stroke_opacity]).to eq(1.0)
end
describe 'with more than one page' do
it 'the extended graphic state resource should be added to both pages' do
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]
expect(extgstates.length).to eq(2)
expect(extgstate[:opacity]).to eq(0.5)
expect(extgstate[:stroke_opacity]).to eq(0.2)
end
end
end
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