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