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- #
- # The Python Imaging Library
- # $Id: PSDraw.py 2813 2006-10-07 10:11:35Z fredrik $
- #
- # 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 EpsImagePlugin
- import string
-
- ##
- # Simple Postscript graphics interface.
-
- class PSDraw:
-
- def __init__(self, fp=None):
- if not fp:
- import sys
- fp = sys.stdout
- self.fp = fp
-
- def begin_document(self, id = None):
- "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):
- "Write Postscript DSC footer"
- self.fp.write("%%EndDocument\n"
- "restore showpage\n"
- "%%End\n")
- if hasattr(self.fp, "flush"):
- self.fp.flush()
-
- def setfont(self, font, size):
- if not self.isofont.has_key(font):
- # 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))
-
- def setink(self, ink):
- print "*** NOT YET IMPLEMENTED ***"
-
- def line(self, xy0, xy1):
- xy = xy0 + xy1
- self.fp.write("%d %d %d %d Vl\n" % xy)
-
- def rectangle(self, box):
- self.fp.write("%d %d M %d %d 0 Vr\n" % box)
-
- def text(self, xy, text):
- text = string.joinfields(string.splitfields(text, "("), "\\(")
- text = string.joinfields(string.splitfields(text, ")"), "\\)")
- xy = xy + (text,)
- self.fp.write("%d %d M (%s) S\n" % xy)
-
- def image(self, box, im, dpi = None):
- "Write an PIL image"
- # 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
- """
-