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# pdftools - A library of classes for parsing and rendering PDF documents.
# Copyright (C) 2001-2008 by David Boddie
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Library General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Library General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
# Created: 2003
"""
pdftext.py
Classes for representing textual information in PDF documents.
Text state command support.
"""
# Import required items from the pdftools module.
from pdfdefs import point
try:
from PyQt4.QtGui import QFontDatabase, QFontMetricsF
with_metrics = True
except ImportError:
with_metrics = False
class Font:
def __init__(self, font, size):
self.font = font
self.size = size
def _width_without_metrics(self, text):
# Return the width of this piece of text when rendered using this
# font.
# * To be replaced: return a value for a monospaced font. *
return len(text) * self.size
def _width_with_metrics(self, text):
# Return the width of this piece of text when rendered using this
# font.
fontName = self.font["BaseFont"].name
at = fontName.find("+")
if at != -1:
fontName = fontName[at+1:]
if "-" in fontName:
family, style = fontName.split("-")[:2]
elif " " in fontName:
family, style = fontName.split(" ")[:2]
elif "," in fontName:
family, style = fontName.split(",")[:2]
else:
family = fontName
style = ""
font = QFontDatabase().font(family, style, self.size)
font.setPointSizeF(self.size)
fm = QFontMetricsF(font)
return fm.width(text)
def width(self, text, use_metrics = False):
if use_metrics and with_metrics:
return self._width_with_metrics(text)
else:
return self._width_without_metrics(text)
class Text:
def __init__(self, text, font, size, character_spacing, word_spacing,
rendering_matrix, position):
self.text = text
# Keep a reference to the font dictionary used.
self.font = font
self.size = size
self.character_spacing = character_spacing
self.word_spacing = word_spacing
self.rendering_matrix = rendering_matrix.copy()
self.position = position
# This is temporary
#sys.stdout.write(text)
def after(self):
# Calculate the location of the current point after the text has
# been placed using the position given as the initial location of the
# current point.
# We must first determine the direction of the text.
# * Assume horizontal text. *
# We examine each character in turn, calculating its width or
# height, depending on the writing direction, then apply the
# character spacing correction to this length value.
# If a space character is found then the word spacing correction is
# additionally applied to the length found for the space.
# Finally, the total displacement of the current point is added to
# its initial value to determine its new value.
return point(self.font.width(self.text) + self.character_spacing, 0)
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