Gabriele Santilli wrote the following script in order to create great PDF documents, other scripts use this tool, so it's better to know it.
The main function is
layout-pdf, lets see an example:
a: [
[
line 10 281 201 281
line 10 16 201 16
textbox 10 250 191 30 [center font Helvetica 20
"REBO License"]
textbox 10 20 191 230 [
(system/license)
]
apply rotation 20 translation 180 255 [
solid box 200.200.200 edge width 0.2 0 0 26 16
textbox 3 3 20 7 [
center font Helvetica 3
"APPROVED"
]
]
]
]
write/binary %license.pdf layout-pdf compose/deep a
Here is the result:
The guide is here:
http://www.colellachiara.com/soft/Misc/pdf-maker-doc.pdf
Here is the source:
REBOL [
Title: "PDF Maker"
Purpose: {
A dialect to create PDF files from REBOL.
}
Author: "Gabriele Santilli"
EMail: giesse@rebol.it
Comments: {
Thanks to Volker Nitsch <volker.nitsch@gmail.com> for the AFM parser.
}
File: %pdf-maker.r
License: {
Copyright (c) 2001-2006, Gabriele Santilli
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following
disclaimer in the documentation and/or other materials provided
with the distribution.
* The name of Gabriele Santilli may not be used to endorse or
promote products derived from this software without specific
prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
}
Date: 3-Aug-2006
Version: 1.27.1 ; majorv.minorv.status
; status: 0: unfinished; 1: testing; 2: stable
History: [
15-Jul-2001 1.1.0 "History start"
15-Jul-2001 1.2.0 "Added some comments; this will hopefully be appreciated :)"
15-Jul-2001 1.3.0 "Added graphics system and some primitives"
15-Jul-2001 1.4.0 "Added coordinate transformations"
16-Jul-2001 1.5.0 "Added circle (approx) and bezier"
16-Jul-2001 1.6.0 "(Hopefully) fixed buggy XREF handling"
17-Jul-2001 1.7.0 "Added paths; now graphics lacks only images"
17-Jul-2001 1.8.0 "Better decimal handling in PDF-FORM"
17-Jul-2001 1.9.0 "Added images (not efficient, but works!)"
21-Jul-2001 1.10.0 "Added font metrics information (THANKS VOLKER!)"
22-Jul-2001 1.11.0 "Text sizing experiments..."
26-Jul-2001 1.12.0 "Added text typesetter (alpha version, only justification)"
26-Jul-2001 1.13.0 "Fixed bugs in justification"
26-Jul-2001 1.14.0 "Finished typesetting engine"
27-Jul-2001 1.15.0 "Fixed various bugs"
31-Jul-2001 1.16.0 "Fixed a nasty bug (layout-pdf wasn't clearing pdf-spec)"
1-Aug-2001 1.17.0 "Added the ability to disable wrapping"
9-Aug-2001 1.18.0 "Changed the behaviour of the newline command in textboxes"
9-Aug-2001 1.19.0 "Changed path-rule a bit; now allows circles in a path too"
25-Aug-2001 1.20.0 "traslation -> translation (fixed the spelling)"
10-Jan-2002 1.21.0 {
Fixed a bug: if a page ended with graphic commands, and the following page
started with graphic commands, these were rendered in the previous page.
Added support for the Euro char (€) in font metrics .
}
24-Feb-2003 1.22.0 {Uploaded new version with temporary PRECALC-TEXTBOX function.}
20-Jun-2003 1.23.0 {
Fixed a bug that caused an error when layouting a string starting with a space
or a newline
}
23-Jul-2003 1.24.0 {
Small change to PRECALC-TEXBOX, now should add enough space for letters that
expand below the baseline (as pqg etc.); it is just an hack, and don't expect
it to really be precise. (That is, the typesetter is too stupid right now
to take this kind of things into account. Maybe I'll change it, or you'll just
have to wait for version 2.)
}
11-Aug-2005 1.25.1 "Port to View 1.3; backported some changes from version 2"
2-Jun-2006 1.26.1 "Fixed a bug with images"
3-Aug-2006 1.27.1 "Fixed a bug (make-images returning none if there where no images)"
]
]
context [
; font metrics information for the 14 standard fonts (THANKS VOLKER!)
; now handles € (it was somehow left out, don't ask me why :)
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}
; guess what are these?
; note: we will actually emit a 1.4 version PDF file, tough
; we'll use the key in the root catalog to state the real version;
; this way we should stay compatible with 1.3 (i.e. Acrobat 4)
pdf-start: "%PDF-1.3^/"
pdf-end: "%%EOF"
; form a decimal value avoiding scientific format etc.
form-decimal: func [
"Form a decimal number"
num [number!]
/local str sign float ip fp
] [
if zero? num [return copy "0"]
sign: either negative? num [
num: abs num
"-"
] [""]
str: make string! 20
num: form multiply power 10 negate float: to-integer log-10 num to-decimal num
ip: first num
fp: copy skip num 2
; understanding this is left as an exercise to the reader. >:->
insert/dup
insert/part
insert
insert/dup
insert
insert str sign
either float < 0 ["0."] [""]
#"0"
-1 - float
ip
fp
either float < 0 [tail fp] [float]
#"0"
float - length? fp
if all [float >= 0 float < length? fp] [insert insert tail str #"." skip fp float ]
str
]
; valid characters in strings
pdf-string-valid: complement charset "()\"
; this converts REBOL values to PDF values; it's way from perfect but works.
pdf-form: func ["REBOL to PDF" value /only /local result mrk1 mrk2] [
result: make string! 256
if block? :value [
if empty? value [return copy "[]"]
if only [insert result "["]
foreach element value [insert insert tail result pdf-form/only element #" " ]
either only [change back tail result "]"] [remove back tail result]
return result
]
if char? :value [
return head insert result reduce [
#"("
either find pdf-string-valid value [""] [#"\"] value
#")"
]
]
if string? :value [
insert result "("
parse/all value [
some [
mrk1: some pdf-string-valid mrk2: (
insert/part tail result mrk1 mrk2
)
| mrk1: skip (
insert insert tail result #"\" mrk1/1
)
]
]
insert tail result ")"
return result
]
if decimal? :value [return form-decimal value]
; issues are used for tricks. ;-)
if issue? :value [return form value]
; other values simply molded currently.
mold :value
]
; this will hold the document's xref table
xref: []
; this will hold the document itself
contents: #{}
; LOWLEVEL PDF DIALECT
; (this is what people on the ml were looking for. :)
pdf-words: context [
; creates an object
obj: func [
id "Object id (generation will always be 0)"
data "A block of data (will use PDF-FORM above)"
] [
insert tail xref compose/deep [(id) [(-1 + index? tail contents)]]
insert tail contents reduce [id " 0 obj^/" pdf-form data "^/endobj^/" ]
]
; creates a stream
stream: func [
id "Object id (generation will always be 0)"
data "Block (will use PDF-FORM) or any-string"
] [
insert tail xref compose/deep [(id) [(-1 + index? tail contents)]]
if block? data [data: pdf-form data]
insert tail contents reduce [
id " 0 obj^/"
pdf-form compose [
#<< /Length (length? data) #>>
]
"^/stream^/"
data
"^/endstream^/endobj^/"
]
]
; creates an Image XObject
; now has full support for the alpha channel (PDF 1.4)
; you are required to supply the ID for the SoftMask
image: func [
id "Object id for the image (generation will always be 0)"
aid "Object id for the SoftMask (generation will always be 0)"
img [image!] "Image data"
/local rgb alpha
] [
insert tail xref compose/deep [(id) [(-1 + index? tail contents)]]
; requires View 1.3
rgb: img/rgb
alpha: img/alpha
insert tail contents reduce [
id " 0 obj^/"
pdf-form compose [
#<< /Type /XObject
/Subtype /Image
/Width (img/size/x)
/Height (img/size/y)
/ColorSpace /DeviceRGB
/BitsPerComponent 8
/Interpolate true
/SMask (aid) 0 R
/Length (length? rgb)
#>>
]
"^/stream^/"
rgb
"^/endstream^/endobj^/"
]
insert tail xref compose/deep [(aid) [(-1 + index? tail contents)]]
; NOTE: I'm not using the Matte key, i.e. I'm assuming that the image
; is not preblended. handling all that would go far beyond the scope of
; the PDF Maker. if you need to use preblended images you could apply the
; inverse formula on the image before passing it to the PDF Maker, or you could
; hack it here adding /Matte for your own purpose... :)
insert tail contents reduce [
aid " 0 obj^/"
pdf-form compose [
#<< /Type /XObject
/Subtype /Image
/Width (img/size/x)
/Height (img/size/y)
/ColorSpace /DeviceGray
/BitsPerComponent 8
/Interpolate true
; REBOL's alpha channel is inverted with respect to PDF's
/Decode [1 0]
/Length (length? alpha)
#>>
]
"^/stream^/"
alpha
"^/endstream^/endobj^/"
]
]
]
; guess what's this? :)
zero-padded: func [val n] [
val: form val
head insert insert/dup make string! n #"0" n - length? val val
]
; makes the xref table for the document
make-xref: has [pos xref' lastfree firstfree cur] [
pos: tail contents
sort/skip xref 2
xref': clear []
firstfree: lastfree: 0
repeat i pick tail xref -2 [
either cur: select xref i [
insert/only tail xref' reduce [cur/1 'n]
] [
either firstfree = 0 [firstfree: i] [xref'/:lastfree/1: i]
lastfree: i
insert/only tail xref' copy [0 f]
]
]
insert pos reduce ["xref^/0 " 1 + length? xref' "^/" zero-padded firstfree 10 " 65535 f ^/" ]
foreach item xref' [
insert tail pos reduce [
zero-padded item/1 10 " 00000 " item/2 " ^/"
]
]
insert tail pos reduce [
"trailer^/"
pdf-form compose [
#<< /Size (1 + length? xref')
/Root 1 0 R ; this assumes root will always be 1
#>>
]
"^/startxref^/"
-1 + index? pos newline
]
]
; THIS IS THE LOWLEVEL FUNCTION
; use this to make a PDF file using the three lowlevel commands defined above
; (OBJ, STREAM and IMAGE)
set 'make-pdf func [spec [block!]] [
clear xref
clear contents
insert contents pdf-start
do bind spec in pdf-words 'self
make-xref
copy head insert tail contents pdf-end
]
; high level dialect begins here...
; this will hold the pages etc.
pages: []
used-fonts: []
font-resources: []
; this will hold the spec then passed to MAKE-PDF
pdf-spec: []
; default page object
default-page: context [
size: [211 297] ; mm. (ISO A4)
offset: [0 0]
rotation: 0
contents: []
]
; default textbox object
default-textbox: context [
bbox: [10 17 191 263]
; default font is Helvetica 4.23 (12pt)
font-name: 'Helvetica
font-size: 4.23
; last used font (to avoid setting it each time)
last-font: [none none]
; line height handling
max-size: 0
linefactor: 1.1
lineheight: none
; last used line height (to avoid setting it each time)
last-lh: none
left: right: 0 ; margins
last-offset: 0 ; current x text offset
; this is the amount of space a text line can consume
; before being wrapped
fuel: bbox/3 - left - right ; text width
wrappers: charset "+-\/"
no-wrap?: no ; set to yes to disable wrapping
in-para?: no
mode: 'justify ; 'left 'right 'center 'as-is
; justify: word spacing vs char spacing factor
word-spacing: 0.5
; buffer holding each rendered line
linebuff: []
; buffer holding the entire text
text: []
; text color (default is black)
color: 0.0.0
last-color: none
; current y position of text (actually, this is a sort of
; temporary text-height; text-height gets the maximum value
; reached by this word) (needed for automatic page breaks)
current-y-pos: 0
; actual height of text (textbox autosizing, automatic page breaks)
text-height: 0
; space between paragraphs
para-skip: 5
to-pdf: does [
compose [
q
(bbox/1) (bbox/2)
(bbox/3) (bbox/4) re W n
BT (bbox/1) (bbox/2 + bbox/4) Td (text) ET
Q
]
]
]
; default space object
default-space: context [
translate: none ; [x y]
scale: none ; [sx sy]
rotate: none ; angle
skew: none ; [alpha beta]
contents: []
to-pdf: has [result] [
result: make block! 256
insert result 'q
; apply transformations...
if translate [
insert tail result reduce [1 0 0 1 translate/1 translate/2 'cm]
]
if rotate [
insert tail result reduce [
cosine rotate sine rotate
negate sine rotate cosine rotate 0 0 'cm
]
]
if scale [
insert tail result reduce [scale/1 0 0 scale/2 0 0 'cm]
]
if skew [
insert tail result reduce [1 tangent skew/1 tangent skew/2 1 0 0 'cm]
]
; handle contents
foreach object contents [insert tail result object/to-pdf ]
head insert tail result 'Q
]
]
; default graphics object
default-gfx: context [
contents: []
to-pdf: does [contents ]
]
; this is a "context" stack; it is used to make spaces work
stack: []
push: func [thing] [insert tail stack thing]
but: func [a [any-type!] b [any-type!]] [:a]
pop: does [if not empty? stack [but last stack remove back tail stack]]
; this creates the document's root objects
make-docroot: func [pages] [
insert tail pdf-spec [
obj 1 compose [
#<< /Type /Catalog
/Version /1.4
/Outlines 2 0 R
/Pages (pages) 0 R
#>>
]
obj 2 [
#<< /Type /Outlines
/Count 0
#>>
]
obj 3 [; ProcSet to use in pages
[/PDF /Text /ImageC]
]
]
]
new: val1: val2: txtb: gfx: none
gfx-emit: func [data] [
if not gfx [insert tail new/contents gfx: make default-gfx []]
insert tail gfx/contents reduce data
]
; TEXT TYPESETTER
typeset-text: none
emit-line: none
context [
sum: chset: widths: kern: prev: char: buff: wbuff: wstr: invalid: wrappers: none
; emit first char in a line
emit-veryfirst: func [char] [
wbuff: reduce [wstr: to-string char]
sum: pick widths prev: 1 + to-integer char
emit-char: :emit-other
]
; emit first char in a word
emit-first: func [char /local k] [
clear wbuff
either k: select/case pick kern prev char [
sum: k
insert insert tail wbuff negate k wstr: to-string char
] [
sum: 0
insert tail wbuff wstr: to-string char
]
sum: sum + pick widths prev: 1 + to-integer char
emit-char: :emit-other
]
; emit any other char
emit-other: func [char /local k] [
either k: select/case pick kern prev char [
sum: sum + k
insert insert tail wbuff negate k wstr: to-string char
] [insert tail wstr char ]
sum: sum + pick widths prev: 1 + to-integer char
]
emit-char: :emit-veryfirst
; handles spaces at the end of a word; they should not be
; rendered if we are at the end of the line
old-spaces: [0 0 0 [""]]
spaces: [0 0 0 []]
emit-space: has [k] [
if all [prev k: select/case pick kern prev #" "] [
spaces/3: spaces/3 + k
spaces/2: spaces/2 - k
]
spaces/1: spaces/1 + 1
spaces/3: spaces/3 + pick widths prev: 33
spaces/4: buff
]
; this actually assumes #"?" is available in any font...
char-rule: [char: chset (emit-char char/1 bc) | invalid (emit-char #"?" bc)]
wrapper-rule: [char: wrappers (emit-char char/1 bc)]
word-rule: [
[some wrapper-rule any char-rule | some char-rule]
opt wrapper-rule
opt [#" " (emit-space) any [#" " (if txtb/mode = 'as-is [emit-space])]]
]
; needed for justification
word-chars: word-spaces: 0
line-chars: line-spaces: 0
bc: does [word-chars: word-chars + 1]
bs: does [word-spaces: word-spaces + 1]
reset-margin: does [
if txtb/left <> txtb/last-offset [
insert tail txtb/text reduce [txtb/left - txtb/last-offset 0 'Td]
txtb/last-offset: txtb/left
]
]
set 'emit-line has [lh ofs] [
if txtb/max-size = 0 [
return empty-line
]
lh: any [txtb/lineheight txtb/max-size * txtb/linefactor]
if txtb-vskip lh [
;print "overflow"
return false
]
if lh <> txtb/last-lh [insert insert tail txtb/text lh 'TL ]
txtb/last-lh: lh
insert tail txtb/text 'T*
switch txtb/mode [
justify [
reset-margin
; no space should be added after the last char!
line-chars: line-chars - 1
either line-spaces > 0 [
if line-chars > 0 [
insert tail txtb/text reduce [
txtb/fuel * txtb/word-spacing / line-spaces 'Tw
1 - txtb/word-spacing * txtb/fuel / line-chars 'Tc
]
]
] [
if line-chars > 0 [
insert tail txtb/text reduce [
txtb/fuel / line-chars 'Tc
]
]
]
]
right [
ofs: txtb/left + txtb/fuel
insert tail txtb/text reduce [ofs - txtb/last-offset 0 'Td]
txtb/last-offset: ofs
]
center [
ofs: txtb/left + txtb/fuel / 2
insert tail txtb/text reduce [ofs - txtb/last-offset 0 'Td]
txtb/last-offset: ofs
]
left [reset-margin ]
as-is [reset-margin ]
]
insert tail txtb/text txtb/linebuff
txtb/fuel: txtb/bbox/3 - txtb/left - txtb/right
txtb/max-size: 0
clear txtb/linebuff
emit-char: :emit-veryfirst
old-spaces: [0 0 0 [""]]
line-spaces: line-chars: 0
insert tail txtb/linebuff reduce [buff: copy/deep [""] 'TJ]
true
]
; render an empty line
empty-line: does [
if txtb-vskip any [txtb/last-lh 0] [return false ]
insert tail txtb/text 'T*
true
]
emit-word: does [
sum: sum * txtb/font-size / 1000
old-spaces/3: old-spaces/3 * txtb/font-size / 1000
either any [txtb/no-wrap? sum + old-spaces/3 <= txtb/fuel line-chars = 0] [
; let's render spaces we did not render before
if old-spaces/2 <> 0 [
insert insert tail old-spaces/4 old-spaces/2 copy ""
]
insert/dup tail last old-spaces/4 #" " old-spaces/1
line-spaces: line-spaces + old-spaces/1 + word-spaces
line-chars: line-chars + old-spaces/1 + word-chars
insert tail buff either integer? wbuff/1 [wbuff ] [
insert tail last buff wbuff/1
next wbuff
]
txtb/fuel: txtb/fuel - sum - old-spaces/3
] [
emit-line
spaces/4: buff
if integer? wbuff/1 [wbuff: next wbuff]
insert tail last buff wbuff/1
insert tail buff next wbuff
txtb/fuel: txtb/fuel - sum
txtb/max-size: txtb/font-size
line-spaces: word-spaces
line-chars: word-chars
]
emit-char: :emit-first
old-spaces: spaces
spaces: copy [0 0 0 [""]]
word-spaces: word-chars: 0
]
set 'typeset-text func [text /local wrp] [
if empty? text [exit]
replace/all text newline #" "
txtb/max-size: max txtb/max-size txtb/font-size
set [widths kern chset] get in metrics txtb/font-name
if txtb/last-font <> reduce [txtb/font-name txtb/font-size] [
used-fonts: union used-fonts reduce [txtb/font-name]
insert tail txtb/linebuff reduce [to-refinement txtb/font-name txtb/font-size 'Tf]
txtb/last-font/1: txtb/font-name
txtb/last-font/2: txtb/font-size
]
if txtb/last-color <> txtb/color [
txtb/last-color: txtb/color
insert tail txtb/linebuff reduce [
c2d txtb/color/1 c2d txtb/color/2 c2d txtb/color/3 'rg
]
]
either all [not empty? txtb/linebuff 'TJ = last txtb/linebuff] [buff: pick tail txtb/linebuff -2 ] [
insert tail txtb/linebuff reduce [buff: copy/deep [""] 'TJ]
]
chset: exclude make bitset! chset wrp: union wrappers: txtb/wrappers charset " ^/"
invalid: exclude complement chset wrp
emit-char: :emit-veryfirst
spaces: copy [0 0 0 [""]]
parse/all text [
opt [
#" " (emit-space) any [#" " (if txtb/mode = 'as-is [emit-space])]
(old-spaces: spaces spaces: copy [0 0 0 [""]])
]
some [word-rule (emit-word) | newline (empty-line)]
]
]
]
; sets the current font; notice that the line height is set to
; size * 1.1 as a reasonable default.
use-font: func [name size] [
txtb/font-name: name
txtb/font-size: size
]
txtb-vskip: func [amount] [
txtb/current-y-pos: txtb/current-y-pos + amount
txtb/text-height: max txtb/text-height txtb/current-y-pos
txtb/text-height > txtb/bbox/4
]
; dialect rules
endp: does [
if txtb/in-para? [
emit-last
txtb-vskip txtb/para-skip
append txtb/text compose [0 (negate txtb/para-skip) Td]
txtb/in-para?: no
]
]
end-para: [opt 'end ['p | 'paragraph] (endp)]
set-wrappers: [
'wrap (txtb/no-wrap?: no) opt ['on set val1 string! (txtb/wrappers: charset val1)]
| 'don't 'wrap (txtb/no-wrap?: yes)
]
set-margins: [opt 'with [
'left 'margin set val1 number! (txtb/left: val1)
| 'right 'margin set val1 number! (txtb/right: val1)
]]
set-para: [
set val1 ['justify | 'left 'align | 'right 'align | 'center | 'as-is] (
endp
txtb/mode: val1
)
any [
set-margins
| opt ['with 'word] 'spacing opt 'factor set val1 number! (txtb/word-spacing: val1)
] (txtb/fuel: txtb/bbox/3 - txtb/left - txtb/right)
]
font-def: ['font set val1 word! set val2 number! (use-font val1 val2)]
set-lead: ['line [
'height set val1 number! (txtb/lineheight: val1)
| 'factor set val1 number! (txtb/lineheight: none txtb/linefactor: val1)
]]
set-para-skip: ['space 'after opt 'paragraphs set val1 number! (txtb/para-skip: val1) ]
draw-text: [set val1 string! (
txtb/in-para?: yes
either txtb/mode = 'as-is [
val1: parse/all val1 "^/"
if not empty? val1 [
typeset-text val1/1
foreach text next val1 [
emit-line
typeset-text text
]
]
] [typeset-text val1]
)]
; 0-255 -> 0.0-1.0
c2d: func [val] [divide any [val 0] 255]
set-color: [set val1 tuple! (txtb/color: val1)]
vspace: [opt ['vertical] 'space set val1 number! (txtb-vskip val1 append txtb/text reduce [0 negate val1 'Td])]
emit-last: does [
either txtb/mode = 'justify [
txtb/mode: 'left
append txtb/text [0 Tc 0 Tw]
emit-line
txtb/mode: 'justify
] [emit-line ]
]
textbox-rule: [
some [
font-def
| 'newline (emit-line)
| vspace
| end-para
| set-para
| set-lead
| draw-text
| set-color
| set-wrappers
| set-para-skip
] end (emit-last)
]
gfxstate-words: context [
butt: 0 round: 1 square: 2
miter: 0 bevel: 2
]
gfxstate-rule: [
'width set val1 number! (gfx-emit [val1 'w])
| 'cap set val1 ['butt | 'round | 'square] (
gfx-emit [get in gfxstate-words val1 'J]
)
| 'join set val1 ['miter | 'round | 'bevel] (
gfx-emit [get in gfxstate-words val1 'j]
)
| 'miter 'limit set val1 number! (gfx-emit [val1 'M])
| 'dash [
'solid (gfx-emit [[] 0 'd])
| set val1 into [some number!] set val2 number! (gfx-emit [val1 val2 'd])
]
]
color-rule: [opt ['color] set val1 tuple! (gfx-emit [c2d val1/1 c2d val1/2 c2d val1/3])]
sc-rule: [color-rule (gfx-emit ['RG])]
fc-rule: [color-rule (gfx-emit ['rg])]
box-rule: [
copy val1 4 number! (
gfx-emit [val1/1 val1/2 val1/3 val1/4 're]
)
]
lineopt-rule: [any [gfxstate-rule | sc-rule]]
boxopt-rule: [any ['line gfxstate-rule | sc-rule]]
sboxopt-rule: [any ['edge gfxstate-rule | 'edge sc-rule | fc-rule]]
circle-rule: [
copy val1 3 number! (
; approximates a circle
gfx-emit [
val1/1 + val1/3 val1/2 'm
val1/1 + val1/3 val1/3 * 0.552 + val1/2
val1/3 * 0.552 + val1/1 val1/2 + val1/3
val1/1 val1/2 + val1/3 'c
-0.552 * val1/3 + val1/1 val1/2 + val1/3
val1/1 - val1/3 val1/3 * 0.552 + val1/2
val1/1 - val1/3 val1/2 'c
val1/1 - val1/3 -0.552 * val1/3 + val1/2
-0.552 * val1/3 + val1/1 val1/2 - val1/3
val1/1 val1/2 - val1/3 'c
0.552 * val1/3 + val1/1 val1/2 - val1/3
val1/1 + val1/3 -0.552 * val1/3 + val1/2
val1/1 + val1/3 val1/2 'c 'h
]
)
]
move-to: ['move opt 'to]
line-to: ['line opt 'to]
boxpath-rule: ['box copy val1 4 number! (gfx-emit [val1/1 val1/2 val1/3 val1/4 're])]
path-rule: [some [boxpath-rule | 'circle circle-rule | shape-rule]]
shape-rule: [
opt move-to copy val1 2 number! (gfx-emit [val1/1 val1/2 'm]) some [
opt line-to copy val1 2 number! (gfx-emit [val1/1 val1/2 'l])
| move-to copy val1 2 number! (gfx-emit [val1/1 val1/2 'm])
| 'bezier copy val1 6 number! (gfx-emit [val1/1 val1/2 val1/3 val1/4 val1/5 val1/6 'c])
| 'bezier 'to copy val1 4 number! (gfx-emit [val1/1 val1/2 val1/3 val1/4 'v])
| 'bezier 'from copy val1 4 number! (gfx-emit [val1/1 val1/2 val1/3 val1/4 'y])
| 'close (gfx-emit ['h])
]
]
contents-rule: [
any [
'textbox (gfx: none insert tail new/contents txtb: make default-textbox [])
opt [copy val1 4 number! (change txtb/bbox val1 txtb/fuel: val1/3 - txtb/left - txtb/right)]
into textbox-rule
| 'apply (
push new
gfx: none
insert tail new/contents new: make default-space []
) any [
'translation copy val1 2 number! (new/translate: val1)
| 'rotation set val1 number! (new/rotate: val1)
| 'scaling copy val1 2 number! (new/scale: val1)
| 'skew copy val1 2 number! (new/skew: val1)
] into contents-rule (new: pop gfx: none)
| 'line lineopt-rule opt [
copy val1 4 number! (gfx-emit [val1/1 val1/2 'm val1/3 val1/4 'l 'S])
]
| 'bezier lineopt-rule copy val1 8 number! (
gfx-emit [
val1/1 val1/2 'm
val1/3 val1/4 val1/5 val1/6 val1/7 val1/8 'c 'S
]
)
| 'box boxopt-rule box-rule (gfx-emit ['S])
| 'solid 'box sboxopt-rule box-rule (gfx-emit ['B])
| 'circle boxopt-rule circle-rule (gfx-emit ['S])
| 'solid 'circle sboxopt-rule circle-rule (gfx-emit ['B])
| 'stroke boxopt-rule into path-rule (gfx-emit ['S])
| 'fill (val2: 'f) any [fc-rule | 'even-odd (val2: 'f*)] opt [into path-rule (gfx-emit [val2])]
| 'paint (val2: 'B) any ['edge gfxstate-rule | 'edge sc-rule | fc-rule | 'even-odd (val2: 'B*) ] into path-rule (gfx-emit [val2])
| 'clip opt 'to (val2: 'W) opt ['even-odd (val2: 'W*)] into path-rule (gfx-emit [val2 'n])
| 'image (
push new
gfx: none
insert tail new/contents new: make default-space []
) opt 'at copy val1 2 number! (new/translate: val1)
opt 'size copy val1 2 number! (new/scale: val1) any [
'rotated set val1 number! (new/rotate: val1)
| 'skew copy val1 2 number! (new/skew: val1)
] set val1 [image! | file! | word!] (
if word? val1 [val1: get val1]
if file? val1 [val1: load val1]
insert insert tail used-images val2: join "Img" length? used-images val1
gfx-emit [to-refinement val2 'Do]
new: pop gfx: none
)
]
]
page-rule: [
(insert tail pages new: make default-page [] gfx: none)
opt ['page any [
'size set val1 number! set val2 number! (new/size: reduce [val1 val2])
| 'rotation set val1 integer! (new/rotation: val1)
| 'offset set val1 number! set val2 number! (new/offset: reduce [val1 val2])
]]
contents-rule
]
; dialect parser
parse-spec: func [spec] [
parse spec [some [into page-rule]]
]
; this creates the font objects in the PDF file
; only the 14 standard PDF fonts supported currently
make-fonts: has [i] [
i: 4
clear font-resources
foreach font used-fonts [
insert tail font-resources reduce [to-refinement font i 0 'R]
insert tail pdf-spec compose/deep [
obj (i) [
#<< /Type /Font
/Subtype /Type1
/BaseFont (to-refinement font)
/Encoding /WinAnsiEncoding
#>>
]
]
i: i + 1
]
i
]
image-resources: []
used-images: []
; this creates the Image XObjects in the PDF file
make-images: func [i] [
clear image-resources
foreach [name image] used-images [
insert tail image-resources reduce [to-refinement name i 0 'R]
insert tail pdf-spec compose/deep [image (i) (i + 1) (image) ]
i: i + 2
]
i
]
; guess what's this? ;)
mm2pt: func [mm] compose [mm * (72 / 25.4)]
; this creates the page objects
make-pages: func [i /local kids mediabox stream pid] [
kids: clear []
pid: (2 * length? pages) + i
foreach page pages [
insert tail kids reduce [i 0 'R]
mediabox: reduce [0 0 mm2pt page/size/1 mm2pt page/size/2]
stream: clear []
insert tail stream compose [(mm2pt 1) 0 0 (mm2pt 1) (mm2pt page/offset/1) (mm2pt page/offset/2) cm]
foreach object page/contents [insert tail stream object/to-pdf ]
insert tail pdf-spec compose/deep [
obj (i) [
#<< /Type /Page
/Parent (pid) 0 R
/MediaBox [(mediabox)]
/Rotate (page/rotation)
/Contents (i + 1) 0 R
/Resources #<<
/ProcSet 3 0 R
(either empty? font-resources [] [compose [/Font #<< (font-resources) #>>]])
(either empty? image-resources [] [compose [/XObject #<< (image-resources) #>>]])
#>>
#>>
]
stream (i + 1) [(stream) ]
]
i: i + 2
]
insert tail pdf-spec compose/deep [
obj (i) [
#<< /Type /Pages
/Kids [(kids)]
/Count (length? pages)
#>>
]
]
i + 1
]
; MAIN FUNCTION - takes a dialect block and returns a binary
set 'layout-pdf func [
"Layout a PDF file (based on the provided spec)"
spec [block!] "PDF contents, see documentation for details"
/local pgs
] [
clear pages
clear used-fonts
clear used-images
clear pdf-spec
parse-spec spec
pgs: make-pages make-images make-fonts
make-docroot pgs - 1
make-pdf pdf-spec
]
; quick hack to allow the creation of tables and so that things like
; MDP will be able to use the PDF Maker
set 'precalc-textbox func [
"Precalculate a textbox, to get its vertical space"
width [number!] "Width of the textbox"
spec [block!] "Textbox spec"
] [
txtb: make default-textbox [
bbox/3: width
fuel: width - left - right
]
parse spec textbox-rule
but (any [txtb/last-lh 0]) * 0.1818 + txtb/text-height txtb: none
]
]
