pdfcanvas.py :  » Chart-Report » Pychart » PyChart-1.39 » pychart » Python Open Source

Home
Python Open Source
1.3.1.2 Python
2.Ajax
3.Aspect Oriented
4.Blog
5.Build
6.Business Application
7.Chart Report
8.Content Management Systems
9.Cryptographic
10.Database
11.Development
12.Editor
13.Email
14.ERP
15.Game 2D 3D
16.GIS
17.GUI
18.IDE
19.Installer
20.IRC
21.Issue Tracker
22.Language Interface
23.Log
24.Math
25.Media Sound Audio
26.Mobile
27.Network
28.Parser
29.PDF
30.Project Management
31.RSS
32.Search
33.Security
34.Template Engines
35.Test
36.UML
37.USB Serial
38.Web Frameworks
39.Web Server
40.Web Services
41.Web Unit
42.Wiki
43.Windows
44.XML
Python Open Source » Chart Report » Pychart 
Pychart » PyChart 1.39 » pychart » pdfcanvas.py
#
# Copyright (C) 2000-2005 by Yasushi Saito (yasushi.saito@gmail.com)
#
# Jockey is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2, or (at your option) any
# later version.
#
# Jockey 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 General Public License
# for more details.
#
import sys
import pychart_util
import re
import math
import theme
import os
import basecanvas
from scaling import *

try:
    import zlib
    _zlib_available_p = 1
except:
    _zlib_available_p = 0

class pdf_stream(object):
    def __init__(self, fp):
        self.fp = fp
        self.off = 0
    def write(self, str):
        self.fp.write(str)
        self.off += len(str)
    def tell(self):
        return self.off

def to_radian(deg):
    return deg*2*math.pi / 360.0

class T(basecanvas.T):
    def __init__(self, fname, compress_p_):
        basecanvas.T.__init__(self)
        self.__out_fname = fname
        self.__reset_context()
        self.__next_obj_id = 1
        self.__next_font_id = 1
        self.__obj_offsets = {}

        # Maps font name -> integer font ID.
        self.__registered_fonts = {}

        self.__lines = []
        self.__nr_gsave = 0

  if compress_p_ and not _zlib_available_p:
      pychart_util.warn("Zlib not available. Compression request ignored.\n")
      compress_p_ = 0
        self.__compress_p = compress_p_

    def __register_font(self, name):
        "Assign an ID to the font NAME. Return its ID."
        if not self.__registered_fonts.has_key(name):
            self.__registered_fonts[name] = self.__next_font_id
            self.__next_font_id += 1
        return self.__registered_fonts[name]

    def __define_obj(self, fp, str):
        obj_id = self.__next_obj_id
        self.__next_obj_id += 1
        self.__obj_offsets[obj_id] = fp.tell()
        fp.write("%d 0 obj\n%s\nendobj\n" % (obj_id, str))
        return obj_id

    def __define_stream_obj(self, fp, s):
        if self.__compress_p:
            p = zlib.compress(s)
            return self.__define_obj(fp, "<</Length %d/Filter/FlateDecode>>\nstream\n%sendstream"
                              % (len(p), p))
        else:
            return self.__define_obj(fp, "<</Length %d\n>>\nstream\n%s\nendstream"
                              % (len(s), s))

    def __define_font_obj(self, fp, name, font_id):
        obj_id = self.__define_obj(fp, """<</Type/Font /Subtype/Type1 /Name/F%d /BaseFont/%s /Encoding/MacRomanEncoding>>""" % (font_id, name))
        return obj_id

    def __reset_context(self):
        self.__font_name = None
        self.__font_size = -1
        self.__line_style = None
        self.__fill_color = None
        self.__stroke_color = None
        self.__mtx_pushed = 0

    def newpath(self):
        pass
    def set_fill_color(self, color):
        if self.__fill_color == color:
            return
        if color.r == color.g and color.r == color.b:
            self.__write("%f g\n" % (color.r))
            self.__write("%f G\n" % (color.r))
        else:
            self.__write("%f %f %f rg\n" % (color.r, color.g, color.b))
            self.__write("%f %f %f RG\n" % (color.r, color.g, color.b))
        self.__fill_color = color
    def set_stroke_color(self, color):
        self.set_fill_color(color)
        return

    def __arcsub(self, x, y, radius, start, theta):
  xcos = math.cos(to_radian(theta))
  xsin = math.sin(to_radian(theta))
  x0 = radius * xcos
  y0 = radius * xsin
   x1 = radius * (4-xcos)/3.0
   y1 = radius * (1-xcos)*(xcos-3)/(3*xsin)

        xx0, xy0 = pychart_util.rotate(x0, y0, start+theta)
        xx1, xy1 = pychart_util.rotate(x1, -y1, start+theta)
        xx2, xy2 = pychart_util.rotate(x1, y1, start+theta)
  self.__write("%f %f %f %f %f %f c\n" %
    (x+xx1, y+xy1, x+xx2, y+xy2, x+xx0, y+xy0))
    def path_arc(self, x, y, radius, ratio, start, end):
        self.comment("PATHARC %f %f %f %f %f %f\n"
               % (x, y, radius, ratio, start, end))
        step = 10
        if radius < 10:
            step = 20
        if radius < 5:
            step = 30
        if ratio != 1.0:
            self.push_transformation((x, y), (1, ratio), None)
            deg = start
            while deg < end:
                theta = min(step, end-deg)
                self.__arcsub(x, y, radius, deg, theta/2)
                deg += theta
            self.pop_transformation()
        else:
            deg = start
            while deg < end:
                theta = min(step, end-deg)
                self.__arcsub(x, y, radius, deg, theta/2)
                deg += theta
        self.comment("end PATHARC\n")

    def text_begin(self):
        self.__write("BT ")
        self.__font_name = None
        self.__font_size = None

    def text_end(self):
        self.__write("ET\n")
    def text_moveto(self, x, y, angle):
  if angle != None:
      xcos = math.cos(to_radian(angle))
      xsin = math.sin(to_radian(angle))
      self.__write("%f %f %f %f %f %f Tm " % (xcos, xsin, -xsin, xcos, x, y))
  else:
      self.__write("1 0 0 1 %f %f Tm " % (x, y))

    def text_show(self, font_name, font_size, color, str):
        if self.__font_name  != font_name or self.__font_size != font_size:
            self.__write("/F%d %d Tf " % (self.__register_font(font_name), font_size))
            self.__font_name = font_name
            self.__font_size = font_size
        self.set_fill_color(color)
        self.__write("(%s) Tj " % (str.encode('mac_roman')))

    def push_transformation(self, baseloc, scale, angle, in_text = 0):
        if in_text:
            op = "Tm"
        else:
            op = "cm"
            self.gsave()

        if baseloc == None:
            baseloc = (0,0)

        if angle != None:
            radian = to_radian(angle)
            self.__write("%f %f %f %f %f %f %s\n" %
                         (math.cos(radian), math.sin(radian),
                          -math.sin(radian), math.cos(radian),
                          baseloc[0], baseloc[1], op))
        if scale != None:
            self.__write("%f 0 0 %f %f %f %s\n" % (scale[0], scale[1],
                                                   baseloc[0],
                                                   baseloc[1], op))

    def pop_transformation(self, in_text = 0):
        if not in_text:
            self.grestore()
    def closepath(self):
        self.__write("h\n")
    def clip_sub(self):
        self.__write("W n\n")
    def fill(self):
        self.__write("f n\n")
    def gsave(self):
        self.__write("q\n")
    def grestore(self):
        self.__write("Q\n")
        self.__reset_context()

    def moveto(self, x, y):
        self.__write('%f %f m ' % (x, y))
    def lineto(self, x, y):
        self.__write("%f %f l\n" % (x, y))
    def stroke(self):
        self.__write("S\n")

    def set_line_style(self, style):
        if (self.__line_style == style):
            pass
        else:
            self.set_stroke_color(style.color)
            self.__write("%f w " % nscale(style.width))
            if style.dash != None:
                self.__write("[%s] 0 d\n" %
                             " ".join(map(str, nscale_seq(style.dash))))
            else:
                self.__write("[] 0 d\n")
            self.__write("%d j %d J\n" % (style.cap_style, style.join_style))
            self.__line_style = style

    def comment(self, str):
        if not self.__compress_p:
            self.__write("%%" + str + "\n")

    def verbatim(self, str):
        self.__write(str)

    def __write(self, str):
        self.__lines.append(str)

    def close(self):
        basecanvas.T.close(self)
  if self.__lines == []:
      return

        _fp, need_close = self.open_output(self.__out_fname)
        fp = pdf_stream(_fp)

        fp.write("%PDF-1.2\n")

        stream_obj_id = self.__define_stream_obj(fp, " ".join(self.__lines))

        fontstr = ""
        for font_name, font_id in self.__registered_fonts.items():
            obj_id = self.__define_font_obj(fp, font_name, font_id)
            fontstr += "/F%d %d 0 R " % (font_id, obj_id)

        pages_obj_id = self.__define_obj(fp, " <</Type/Pages /Kids [%d 0 R] /Count 1 >>" % (self.__next_obj_id + 1))

        bbox = theme.adjust_bounding_box([xscale(self.__xmin), yscale(self.__ymin),
                                          xscale(self.__xmax), yscale(self.__ymax)])

        page_obj_id = self.__define_obj(fp, """  <</Type/Page
\t/Parent %d 0 R
\t/Contents %d 0 R
\t/MediaBox [%d %d %d %d]
\t/Resources << /ProcSet [/PDF /Text]
\t\t/Font << %s >>
>> >>""" % (pages_obj_id, stream_obj_id,
            bbox[0], bbox[1], bbox[2], bbox[3], fontstr))

        info_str = "/Producer (%s)\n/CreationDate (%s)" % (self.creator, self.creation_date)

        if self.title:
            info_str += "\n/Title (%s)" % (self.title, )
        if self.author:
            info_str += "\n/Author (%s)" % (self.author, )

        info_obj_id = self.__define_obj(fp, """<<%s>>""" % info_str)
        catalog_obj_id = self.__define_obj(fp, """  <</Type/Catalog/Pages %d 0 R>>""" % (pages_obj_id))

        xref_offset = fp.tell()
        fp.write("xref\n0 %d\n" % (len(self.__obj_offsets)+1))
        fp.write("0000000000 65535 f \n")
        id = 1
        while id <= len(self.__obj_offsets):
            fp.write("%010d 00000 n \n" % (self.__obj_offsets[id]))
            id += 1
        fp.write("trailer << /Size %d /Root %d 0 R /Info %d 0 R\n>>\n" % (len(self.__obj_offsets)+1, catalog_obj_id, info_obj_id))
        fp.write("startxref\n%d\n%%%%EOF\n" % xref_offset)

        if need_close:
            _fp.close()
www.java2java.com | Contact Us
Copyright 2009 - 12 Demo Source and Support. All rights reserved.
All other trademarks are property of their respective owners.