Source code for PIL.PSDraw

#
# 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.
#

from . import EpsImagePlugin
from ._util import py3
import sys

##
# Simple Postscript graphics interface.


[docs]class PSDraw(object): """ 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 not py3 or self.fp == sys.stdout: self.fp.write(to_write) else: self.fp.write(bytes(to_write, "UTF-8"))
[docs] 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 = {}
[docs] 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()
[docs] 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-%s ISOLatin1Encoding /%s E\n" % (font, font)) self.isofont[font] = 1 # rough self._fp_write("/F0 %d /PSDraw-%s F\n" % (size, font))
[docs] 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)
[docs] 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)
[docs] 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)
[docs] 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 = float(im.size[0] * 72) / dpi y = float(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" % (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" % (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 """