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#!python
#
# This file is part of aafigure. https://github.com/aafigure/aafigure
# (C) 2006 Chris Liechti <cliechti@gmx.net>
#
# SPDX-License-Identifier: BSD-3-Clause
"""\
SVG renderer for the aafigure package.
"""
import sys
import codecs
from xml.sax.saxutils import escape
class SVGOutputVisitor:
"""Render a list of shapes as SVG image."""
def __init__(self, options):
self.options = options
self.file_like = codecs.getwriter('utf-8')(options['file_like'])
self.scale = options['scale'] * 7
self.line_width = options['line_width']
self.foreground = options['foreground']
self.background = options['background']
self.fillcolor = options['fill']
self.border = 3
self.indent = ''
# if front is given explicit, use it instead of textual/proportional flags
if 'font' in options:
self.font = options['font']
else:
if options['proportional']:
self.font = u'sans-serif'
else:
self.font = u'monospace'
def _num(self, number):
"""helper to scale numbers for svg output"""
return number * self.scale
def _coordinate(self, number):
"""helper to scale numbers for svg output"""
return self._num(number) + self.border
def get_size_attrs(self):
"""get image size as svg text"""
# this function is here beacuse of a hack. the rst2html converter
# has to know the size of the figure it inserts
return u'width="{}" height="{}"'.format(
self._num(self.width) + 2 * self.border,
self._num(self.height) + 2 * self.border)
def visit_image(self, aa_image, xml_header=True):
"""\
Process the given ASCIIArtFigure and output the shapes in
the SVG 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
if xml_header:
self.file_like.write(
u'<?xml version="1.0" standalone="no"?>\n'
'<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" '
'"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">\n\n'
'<svg width="{w}" height="{h}" viewBox="0 0 {w} {h}" version="1.1" xmlns="http://www.w3.org/2000/svg" '
'xmlns:xlink="http://www.w3.org/1999/xlink">\n'
'<!-- automatically generated by aafigure -->'.format(
w=self._num(self.width) + 2 * self.border,
h=self._num(self.height) + 2 * self.border))
else:
self.file_like.write(
u'<svg width="{w}" height="{h}" viewBox="0 0 {w} {h}" version="1.1" '
'xmlns="http://www.w3.org/2000/svg">\n'.format(
w=self._num(self.width) + 2 * self.border,
h=self._num(self.height) + 2 * self.border))
self.visit_shapes(aa_image.shapes)
self.file_like.write(u'</svg>\n')
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(u"WARNING: don't know how to handle shape {!r}\n".format(shape))
# - - - - - - SVG drawing helpers - - - - - - -
def _line(self, x1, y1, x2, y2, thick):
"""Draw a line, coordinates given as four decimal numbers"""
self.file_like.write(
u'{}<line x1="{}" y1="{}" x2="{}" y2="{}" stroke="{}" '
'stroke-width="{}" />\n'.format(
self.indent,
self._coordinate(x1),
self._coordinate(y1),
self._coordinate(x2),
self._coordinate(y2),
self.foreground,
self.line_width * (1 + bool(thick))))
def _rectangle(self, x1, y1, x2, y2, style=''):
"""\
Draw a rectangle, coordinates given as four decimal numbers.
``style`` is inserted in the SVG. It could be e.g. "fill:yellow"
"""
if x1 > x2:
x1, x2 = x2, x1
if y1 > y2:
y1, y2 = y2, y1
self.file_like.write(
u'{}<rect x="{}" y="{}" width="{}" height="{}" stroke="{}" '
'fill="{}" stroke-width="{}" style="{}" />'.format(
self.indent,
self._coordinate(x1), self._coordinate(y1),
self._num(x2 - x1), self._num(y2 - y1),
self.fillcolor, # stroke:%s;
self.fillcolor,
self.line_width,
style))
# - - - - - - visitor function for the different shape types - - - - - - -
def visit_point(self, point):
self.file_like.write(
u'{}<circle cx="{}" cy="{}" r="{}" fill="{}" stroke="{}" '
'stroke-width="{}" />'.format(
self.indent,
self._coordinate(point.x), self._coordinate(point.y),
self._num(0.2),
self.foreground, self.foreground,
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.file_like.write(
u'{}<circle cx="{}" cy="{}" r="{}" stroke="{}" stroke-width="{}" '
'fill="{}" />'.format(
self.indent,
self._coordinate(circle.center.x), self._coordinate(circle.center.y),
self._num(circle.radius),
self.foreground,
self.line_width,
self.fillcolor))
def visit_label(self, label):
# font-weight="bold" style="stroke:%s"
self.file_like.write(
u'{}<text x="{}" y="{}" font-family="{}" font-size="{}" '
'fill="{}" >\n {}\n{}</text>\n'.format(
self.indent,
self._coordinate(label.position.x), self._coordinate(label.position.y - 0.3), # XXX static offset not good in all situations
self.font,
self._num(self.aa_image.nominal_size),
self.foreground,
escape(label.text),
self.indent))
def visit_group(self, group):
self.file_like.write(u'<g>\n')
old_indent = self.indent
self.indent += u' '
self.visit_shapes(group.shapes)
self.indent = old_indent
self.file_like.write(u'</g>\n')
def visit_arc(self, arc):
p1, p2 = arc.start, arc.end
c1 = arc.start_control_point()
c2 = arc.end_control_point()
self.file_like.write(
u'{}<path d="M{},{} C{},{} {},{} {},{}" fill="none" '
'stroke="{}" stroke-width="{}" />'.format(
self.indent,
self._coordinate(p1.x), self._coordinate(p1.y),
self._coordinate(c1.x), self._coordinate(c1.y),
self._coordinate(c2.x), self._coordinate(c2.y),
self._coordinate(p2.x), self._coordinate(p2.y),
self.foreground,
self.line_width))
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