1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
|
#!python
#
# This file is part of aafigure. https://github.com/aafigure/aafigure
# (C) 2008 Chris Liechti <cliechti@gmx.net>
#
# SPDX-License-Identifier: BSD-3-Clause
"""\
PDF renderer for the aafigure package.
"""
import sys
from .error import UnsupportedFormatError
try:
# import reportlab
from reportlab.lib import colors
from reportlab.graphics.shapes import *
from reportlab.graphics import renderPDF
from reportlab.pdfbase import pdfmetrics
from reportlab.pdfbase.ttfonts import TTFont
except ImportError:
raise UnsupportedFormatError('please install Reportlab to get PDF output support')
class PDFOutputVisitor:
"""Render a list of shapes as PDF vector image."""
def __init__(self, options):
"""\
Dual use as PDF file writer or as Reportlab Drawing generator.
files: file_like or filname is given in the options:
The PDF file is written there.
Drawing: file_like and filname are missing in the options:
No output is generated. The Drawing can be used for example::
visitor = PDFOutputVisitor(None, ...)
do_something(renderPDF.GraphicsFlowable(visitor.drawing))
"""
self.options = options
self.scale = 4 * options['scale']
self.line_width = 0.4 * options['line_width']
self.foreground = options['foreground']
self.background = options['background']
self.fillcolor = options['fill']
# if front is given explicit, use it instead of textual/proportional flags
if 'font' in options:
self.font = options['font']
if self.font.endswith('.ttf'):
# ttf support
pdfmetrics.registerFont(TTFont(self.font, self.font))
else:
if options['proportional']:
self.font = 'Helvetica'
else:
self.font = 'Courier'
def _num(self, number):
"""helper to format numbers with scale for PDF output"""
return number * self.scale
def _color(self, color):
return colors.HexColor(color)
def visit_image(self, aa_image):
"""
Process the given ASCIIArtFigure and output the shapes in
the PDF file
"""
self.aa_image = aa_image # save for later XXX not optimal to do it here
self.width = aa_image.width * aa_image.nominal_size * aa_image.aspect_ratio
self.height = aa_image.height * aa_image.nominal_size
self.drawing = Drawing(self._num(self.width), self._num(self.height))
self.visit_shapes(aa_image.shapes)
# if file is given, write
if 'file_like' in self.options:
renderPDF.drawToFile(self.drawing, self.options['file_like'], '')
def visit_shapes(self, shapes):
for shape in shapes:
shape_name = shape.__class__.__name__.lower()
visitor_name = 'visit_{}'.format(shape_name)
if hasattr(self, visitor_name):
getattr(self, visitor_name)(shape)
else:
sys.stderr.write("WARNING: don't know how to handle shape {!r}\n".format(shape))
# - - - - - - PDF drawing helpers - - - - - - -
def _line(self, x1, y1, x2, y2, thick):
"""Draw a line, coordinates given as four decimal numbers"""
self.drawing.add(Line(
self._num(x1), self._num(self.height - y1),
self._num(x2), self._num(self.height - y2),
strokeColor=self._color(self.foreground),
strokeWidth=self.line_width*(1 + 0.5 * bool(thick))))
def _rectangle(self, x1, y1, x2, y2, style=''):
"""Draw a rectangle, coordinates given as four decimal numbers."""
if x1 > x2:
x1, x2 = x2, x1
if y1 > y2:
y1, y2 = y2, y1
self.drawing.add(Rect(
self._num(x1), self._num(self.height - y2),
self._num(x2 - x1), self._num(y2 - y1),
fillColor=self._color(self.fillcolor),
strokeWidth=self.line_width))
# - - - - - - visitor function for the different shape types - - - - - - -
def visit_point(self, point):
self.drawing.add(Circle(
self._num(point.x), self._num(self.height - point.y),
self._num(0.2),
fillColor=self._color(self.foreground),
strokeWidth=self.line_width))
def visit_line(self, line):
x1, x2 = line.start.x, line.end.x
y1, y2 = line.start.y, line.end.y
self._line(x1, y1, x2, y2, line.thick)
def visit_rectangle(self, rectangle):
self._rectangle(
rectangle.p1.x, rectangle.p1.y,
rectangle.p2.x, rectangle.p2.y)
def visit_circle(self, circle):
self.drawing.add(Circle(
self._num(circle.center.x), self._num(self.height - circle.center.y),
self._num(circle.radius),
strokeColor=self._color(self.foreground),
fillColor=self._color(self.fillcolor),
strokeWidth=self.line_width))
def visit_label(self, label):
# font-weight="bold" style="stroke:%s"
self.drawing.add(String(
self._num(label.position.x), self._num(self.height - label.position.y + self.aa_image.nominal_size * 0.2),
label.text,
fontSize=self._num(self.aa_image.nominal_size),
fontName=self.font,
fillColor=self._color(self.foreground)))
def visit_group(self, group):
# XXX could add a group to the PDF file
self.visit_shapes(group.shapes)
def visit_arc(self, arc):
p1, p2 = arc.start, arc.end
c1 = arc.start_control_point()
c2 = arc.end_control_point()
path = Path(strokeColor=self._color(self.foreground),
strokeWidth=self.line_width)
path.moveTo(self._num(p1.x), self._num(self.height - p1.y))
path.curveTo(self._num(c1.x), self._num(self.height - c1.y),
self._num(c2.x), self._num(self.height - c2.y),
self._num(p2.x), self._num(self.height - p2.y))
self.drawing.add(path)
|
