1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
|
# encoding: utf-8
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
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
create_pdf
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
create_pdf
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
create_pdf
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
create_pdf
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 "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]
expect(extgstate[:opacity]).to eq(0.0)
expect(extgstate[:stroke_opacity]).to eq(0.0)
create_pdf
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
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]
expect(extgstates.length).to eq(2)
expect(extgstate[:opacity]).to eq(0.5)
expect(extgstate[:stroke_opacity]).to eq(0.2)
end
end
end
|
