forked from s444420/AL-2020
238 lines
6.6 KiB
Python
238 lines
6.6 KiB
Python
#
|
|
# The Python Imaging Library
|
|
# $Id$
|
|
#
|
|
# simple postscript graphics interface
|
|
#
|
|
# History:
|
|
# 1996-04-20 fl Created
|
|
# 1999-01-10 fl Added gsave/grestore to image method
|
|
# 2005-05-04 fl Fixed floating point issue in image (from Eric Etheridge)
|
|
#
|
|
# Copyright (c) 1997-2005 by Secret Labs AB. All rights reserved.
|
|
# Copyright (c) 1996 by Fredrik Lundh.
|
|
#
|
|
# See the README file for information on usage and redistribution.
|
|
#
|
|
|
|
import sys
|
|
|
|
from . import EpsImagePlugin
|
|
|
|
##
|
|
# Simple Postscript graphics interface.
|
|
|
|
|
|
class PSDraw:
|
|
"""
|
|
Sets up printing to the given file. If **fp** is omitted,
|
|
:py:attr:`sys.stdout` is assumed.
|
|
"""
|
|
|
|
def __init__(self, fp=None):
|
|
if not fp:
|
|
fp = sys.stdout
|
|
self.fp = fp
|
|
|
|
def _fp_write(self, to_write):
|
|
if self.fp == sys.stdout:
|
|
self.fp.write(to_write)
|
|
else:
|
|
self.fp.write(bytes(to_write, "UTF-8"))
|
|
|
|
def begin_document(self, id=None):
|
|
"""Set up printing of a document. (Write Postscript DSC header.)"""
|
|
# FIXME: incomplete
|
|
self._fp_write(
|
|
"%!PS-Adobe-3.0\n"
|
|
"save\n"
|
|
"/showpage { } def\n"
|
|
"%%EndComments\n"
|
|
"%%BeginDocument\n"
|
|
)
|
|
# self._fp_write(ERROR_PS) # debugging!
|
|
self._fp_write(EDROFF_PS)
|
|
self._fp_write(VDI_PS)
|
|
self._fp_write("%%EndProlog\n")
|
|
self.isofont = {}
|
|
|
|
def end_document(self):
|
|
"""Ends printing. (Write Postscript DSC footer.)"""
|
|
self._fp_write("%%EndDocument\nrestore showpage\n%%End\n")
|
|
if hasattr(self.fp, "flush"):
|
|
self.fp.flush()
|
|
|
|
def setfont(self, font, size):
|
|
"""
|
|
Selects which font to use.
|
|
|
|
:param font: A Postscript font name
|
|
:param size: Size in points.
|
|
"""
|
|
if font not in self.isofont:
|
|
# reencode font
|
|
self._fp_write("/PSDraw-{} ISOLatin1Encoding /{} E\n".format(font, font))
|
|
self.isofont[font] = 1
|
|
# rough
|
|
self._fp_write("/F0 %d /PSDraw-%s F\n" % (size, font))
|
|
|
|
def line(self, xy0, xy1):
|
|
"""
|
|
Draws a line between the two points. Coordinates are given in
|
|
Postscript point coordinates (72 points per inch, (0, 0) is the lower
|
|
left corner of the page).
|
|
"""
|
|
xy = xy0 + xy1
|
|
self._fp_write("%d %d %d %d Vl\n" % xy)
|
|
|
|
def rectangle(self, box):
|
|
"""
|
|
Draws a rectangle.
|
|
|
|
:param box: A 4-tuple of integers whose order and function is currently
|
|
undocumented.
|
|
|
|
Hint: the tuple is passed into this format string:
|
|
|
|
.. code-block:: python
|
|
|
|
%d %d M %d %d 0 Vr\n
|
|
"""
|
|
self._fp_write("%d %d M %d %d 0 Vr\n" % box)
|
|
|
|
def text(self, xy, text):
|
|
"""
|
|
Draws text at the given position. You must use
|
|
:py:meth:`~PIL.PSDraw.PSDraw.setfont` before calling this method.
|
|
"""
|
|
text = "\\(".join(text.split("("))
|
|
text = "\\)".join(text.split(")"))
|
|
xy = xy + (text,)
|
|
self._fp_write("%d %d M (%s) S\n" % xy)
|
|
|
|
def image(self, box, im, dpi=None):
|
|
"""Draw a PIL image, centered in the given box."""
|
|
# default resolution depends on mode
|
|
if not dpi:
|
|
if im.mode == "1":
|
|
dpi = 200 # fax
|
|
else:
|
|
dpi = 100 # greyscale
|
|
# image size (on paper)
|
|
x = im.size[0] * 72 / dpi
|
|
y = im.size[1] * 72 / dpi
|
|
# max allowed size
|
|
xmax = float(box[2] - box[0])
|
|
ymax = float(box[3] - box[1])
|
|
if x > xmax:
|
|
y = y * xmax / x
|
|
x = xmax
|
|
if y > ymax:
|
|
x = x * ymax / y
|
|
y = ymax
|
|
dx = (xmax - x) / 2 + box[0]
|
|
dy = (ymax - y) / 2 + box[1]
|
|
self._fp_write("gsave\n{:f} {:f} translate\n".format(dx, dy))
|
|
if (x, y) != im.size:
|
|
# EpsImagePlugin._save prints the image at (0,0,xsize,ysize)
|
|
sx = x / im.size[0]
|
|
sy = y / im.size[1]
|
|
self._fp_write("{:f} {:f} scale\n".format(sx, sy))
|
|
EpsImagePlugin._save(im, self.fp, None, 0)
|
|
self._fp_write("\ngrestore\n")
|
|
|
|
|
|
# --------------------------------------------------------------------
|
|
# Postscript driver
|
|
|
|
#
|
|
# EDROFF.PS -- Postscript driver for Edroff 2
|
|
#
|
|
# History:
|
|
# 94-01-25 fl: created (edroff 2.04)
|
|
#
|
|
# Copyright (c) Fredrik Lundh 1994.
|
|
#
|
|
|
|
|
|
EDROFF_PS = """\
|
|
/S { show } bind def
|
|
/P { moveto show } bind def
|
|
/M { moveto } bind def
|
|
/X { 0 rmoveto } bind def
|
|
/Y { 0 exch rmoveto } bind def
|
|
/E { findfont
|
|
dup maxlength dict begin
|
|
{
|
|
1 index /FID ne { def } { pop pop } ifelse
|
|
} forall
|
|
/Encoding exch def
|
|
dup /FontName exch def
|
|
currentdict end definefont pop
|
|
} bind def
|
|
/F { findfont exch scalefont dup setfont
|
|
[ exch /setfont cvx ] cvx bind def
|
|
} bind def
|
|
"""
|
|
|
|
#
|
|
# VDI.PS -- Postscript driver for VDI meta commands
|
|
#
|
|
# History:
|
|
# 94-01-25 fl: created (edroff 2.04)
|
|
#
|
|
# Copyright (c) Fredrik Lundh 1994.
|
|
#
|
|
|
|
VDI_PS = """\
|
|
/Vm { moveto } bind def
|
|
/Va { newpath arcn stroke } bind def
|
|
/Vl { moveto lineto stroke } bind def
|
|
/Vc { newpath 0 360 arc closepath } bind def
|
|
/Vr { exch dup 0 rlineto
|
|
exch dup neg 0 exch rlineto
|
|
exch neg 0 rlineto
|
|
0 exch rlineto
|
|
100 div setgray fill 0 setgray } bind def
|
|
/Tm matrix def
|
|
/Ve { Tm currentmatrix pop
|
|
translate scale newpath 0 0 .5 0 360 arc closepath
|
|
Tm setmatrix
|
|
} bind def
|
|
/Vf { currentgray exch setgray fill setgray } bind def
|
|
"""
|
|
|
|
#
|
|
# ERROR.PS -- Error handler
|
|
#
|
|
# History:
|
|
# 89-11-21 fl: created (pslist 1.10)
|
|
#
|
|
|
|
ERROR_PS = """\
|
|
/landscape false def
|
|
/errorBUF 200 string def
|
|
/errorNL { currentpoint 10 sub exch pop 72 exch moveto } def
|
|
errordict begin /handleerror {
|
|
initmatrix /Courier findfont 10 scalefont setfont
|
|
newpath 72 720 moveto $error begin /newerror false def
|
|
(PostScript Error) show errorNL errorNL
|
|
(Error: ) show
|
|
/errorname load errorBUF cvs show errorNL errorNL
|
|
(Command: ) show
|
|
/command load dup type /stringtype ne { errorBUF cvs } if show
|
|
errorNL errorNL
|
|
(VMstatus: ) show
|
|
vmstatus errorBUF cvs show ( bytes available, ) show
|
|
errorBUF cvs show ( bytes used at level ) show
|
|
errorBUF cvs show errorNL errorNL
|
|
(Operand stargck: ) show errorNL /ostargck load {
|
|
dup type /stringtype ne { errorBUF cvs } if 72 0 rmoveto show errorNL
|
|
} forall errorNL
|
|
(Execution stargck: ) show errorNL /estargck load {
|
|
dup type /stringtype ne { errorBUF cvs } if 72 0 rmoveto show errorNL
|
|
} forall
|
|
end showpage
|
|
} def end
|
|
"""
|