Merge pull request #1055 from hugovk/test_psdraw

Update and test PSDraw
This commit is contained in:
wiredfool 2014-12-29 15:17:23 -08:00
commit 5390aa1692
3 changed files with 79 additions and 31 deletions

View File

@ -35,23 +35,29 @@ class PSDraw:
fp = sys.stdout fp = sys.stdout
self.fp = fp self.fp = fp
def _fp_write(self, to_write):
if bytes is str:
self.fp.write(to_write)
else:
self.fp.write(bytes(to_write, 'UTF-8'))
def begin_document(self, id=None): def begin_document(self, id=None):
"""Set up printing of a document. (Write Postscript DSC header.)""" """Set up printing of a document. (Write Postscript DSC header.)"""
# FIXME: incomplete # FIXME: incomplete
self.fp.write("%!PS-Adobe-3.0\n" self._fp_write("%!PS-Adobe-3.0\n"
"save\n" "save\n"
"/showpage { } def\n" "/showpage { } def\n"
"%%EndComments\n" "%%EndComments\n"
"%%BeginDocument\n") "%%BeginDocument\n")
# self.fp.write(ERROR_PS) # debugging! # self.fp_write(ERROR_PS) # debugging!
self.fp.write(EDROFF_PS) self._fp_write(EDROFF_PS)
self.fp.write(VDI_PS) self._fp_write(VDI_PS)
self.fp.write("%%EndProlog\n") self._fp_write("%%EndProlog\n")
self.isofont = {} self.isofont = {}
def end_document(self): def end_document(self):
"""Ends printing. (Write Postscript DSC footer.)""" """Ends printing. (Write Postscript DSC footer.)"""
self.fp.write("%%EndDocument\n" self._fp_write("%%EndDocument\n"
"restore showpage\n" "restore showpage\n"
"%%End\n") "%%End\n")
if hasattr(self.fp, "flush"): if hasattr(self.fp, "flush"):
@ -66,18 +72,11 @@ class PSDraw:
""" """
if font not in self.isofont: if font not in self.isofont:
# reencode font # reencode font
self.fp.write("/PSDraw-%s ISOLatin1Encoding /%s E\n" % self._fp_write("/PSDraw-%s ISOLatin1Encoding /%s E\n" %
(font, font)) (font, font))
self.isofont[font] = 1 self.isofont[font] = 1
# rough # rough
self.fp.write("/F0 %d /PSDraw-%s F\n" % (size, font)) self._fp_write("/F0 %d /PSDraw-%s F\n" % (size, font))
def setink(self, ink):
"""
.. warning:: This has been in the PIL API for ages but was never implemented.
"""
print("*** NOT YET IMPLEMENTED ***")
def line(self, xy0, xy1): def line(self, xy0, xy1):
""" """
@ -86,7 +85,7 @@ class PSDraw:
left corner of the page). left corner of the page).
""" """
xy = xy0 + xy1 xy = xy0 + xy1
self.fp.write("%d %d %d %d Vl\n" % xy) self._fp_write("%d %d %d %d Vl\n" % xy)
def rectangle(self, box): def rectangle(self, box):
""" """
@ -101,7 +100,7 @@ class PSDraw:
%d %d M %d %d 0 Vr\n %d %d M %d %d 0 Vr\n
""" """
self.fp.write("%d %d M %d %d 0 Vr\n" % box) self._fp_write("%d %d M %d %d 0 Vr\n" % box)
def text(self, xy, text): def text(self, xy, text):
""" """
@ -111,7 +110,7 @@ class PSDraw:
text = "\\(".join(text.split("(")) text = "\\(".join(text.split("("))
text = "\\)".join(text.split(")")) text = "\\)".join(text.split(")"))
xy = xy + (text,) xy = xy + (text,)
self.fp.write("%d %d M (%s) S\n" % xy) self._fp_write("%d %d M (%s) S\n" % xy)
def image(self, box, im, dpi=None): def image(self, box, im, dpi=None):
"""Draw a PIL image, centered in the given box.""" """Draw a PIL image, centered in the given box."""
@ -135,14 +134,14 @@ class PSDraw:
y = ymax y = ymax
dx = (xmax - x) / 2 + box[0] dx = (xmax - x) / 2 + box[0]
dy = (ymax - y) / 2 + box[1] dy = (ymax - y) / 2 + box[1]
self.fp.write("gsave\n%f %f translate\n" % (dx, dy)) self._fp_write("gsave\n%f %f translate\n" % (dx, dy))
if (x, y) != im.size: if (x, y) != im.size:
# EpsImagePlugin._save prints the image at (0,0,xsize,ysize) # EpsImagePlugin._save prints the image at (0,0,xsize,ysize)
sx = x / im.size[0] sx = x / im.size[0]
sy = y / im.size[1] sy = y / im.size[1]
self.fp.write("%f %f scale\n" % (sx, sy)) self._fp_write("%f %f scale\n" % (sx, sy))
EpsImagePlugin._save(im, self.fp, None, 0) EpsImagePlugin._save(im, self.fp, None, 0)
self.fp.write("\ngrestore\n") self._fp_write("\ngrestore\n")
# -------------------------------------------------------------------- # --------------------------------------------------------------------
# Postscript driver # Postscript driver

50
Tests/test_psdraw.py Normal file
View File

@ -0,0 +1,50 @@
from helper import unittest, PillowTestCase
class TestPsDraw(PillowTestCase):
def test_draw_postscript(self):
# Based on Pillow tutorial, but there is no textsize:
# http://pillow.readthedocs.org/en/latest/handbook/tutorial.html
# Arrange
from PIL import Image
from PIL import PSDraw
tempfile = self.tempfile('temp.ps')
fp = open(tempfile, "wb")
im = Image.open("Tests/images/hopper.ppm")
title = "hopper"
box = (1*72, 2*72, 7*72, 10*72) # in points
# Act
ps = PSDraw.PSDraw(fp)
ps.begin_document(title)
# draw diagonal lines in a cross
ps.line((1*72, 2*72), (7*72, 10*72))
ps.line((7*72, 2*72), (1*72, 10*72))
# draw the image (75 dpi)
ps.image(box, im, 75)
ps.rectangle(box)
# draw title
ps.setfont("Courier", 36)
ps.text((3*72, 4*72), title)
ps.end_document()
fp.close()
# Assert
# Check non-zero file was created
import os
self.assertTrue(os.path.isfile(tempfile))
self.assertGreater(os.path.getsize(tempfile), 0)
if __name__ == '__main__':
unittest.main()
# End of file

View File

@ -445,10 +445,9 @@ Drawing Postscript
ps.image(box, im, 75) ps.image(box, im, 75)
ps.rectangle(box) ps.rectangle(box)
# draw centered title # draw title
ps.setfont("HelveticaNarrow-Bold", 36) ps.setfont("HelveticaNarrow-Bold", 36)
w, h, b = ps.textsize(title) ps.text((3*72, 4*72), title)
ps.text((4*72-w/2, 1*72-h), title)
ps.end_document() ps.end_document()