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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
"""\
Bitmap renderer for the aafigure package, using the Python Imaging Library.
"""
import sys
from .error import UnsupportedFormatError
try:
from PIL import Image, ImageDraw
except ImportError:
raise UnsupportedFormatError('please install PIL or Pillow to get bitmap output support')
from . import PILhelper
class PILOutputVisitor:
"""Render a list of shapes as bitmap."""
def __init__(self, options):
self.options = options
self.scale = options['scale'] * 8
self.debug = options['debug']
self.line_width = options['line_width']
self.foreground = options['foreground']
self.background = options['background']
self.fillcolor = options['fill']
def _num(self, number):
return number * self.scale
def visit_image(self, aa_image):
"""\
Process the given ASCIIArtFigure and draw the shapes in
the bitmap file
"""
self.aa_image = aa_image # save for later XXX not optimal to do it here
self.width = (aa_image.width + 1) * aa_image.nominal_size * aa_image.aspect_ratio
self.height = (aa_image.height + 1) * aa_image.nominal_size
# if font is given explicit, use it instead of proportional flag
font_size = int(self._num(self.aa_image.nominal_size * 1.1))
if 'font' in self.options:
self.font = PILhelper.font_by_name(self.options['font'], font_size)
else:
self.font = PILhelper.font_by_type(self.options['proportional'], font_size)
if self.font is None:
sys.stderr.write("WARNING: font not found, using PIL default font\n")
self.image = Image.new(
'RGB',
(int(self._num(self.width)), int(self._num(self.height))),
self.background
)
self.draw = ImageDraw.Draw(self.image)
#~ if self.debug:
#~ #draw a rectangle around entire image
#~ self._rectangle(
#~ 0,0,
#~ aa_image.width, aa_image.height,
#~ style = 'fill:none;',
#~ )
self.visit_shapes(aa_image.shapes)
del self.draw
file_type = self.options['format'].lower()
if file_type == 'jpg':
file_type = 'jpeg' # alias
try:
if 'file_like' in self.options:
self.image.save(self.options['file_like'], file_type)
except KeyError:
raise UnsupportedFormatError("PIL doesn't support image format {!r}".format(file_type))
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))
def visit_group(self, group):
self.visit_shapes(group.shapes)
# - - - - - - drawing helpers - - - - - - -
def _line(self, x1, y1, x2, y2):
"""Draw a line, coordinates given as four decimal numbers"""
self.draw.line((self._num(x1), self._num(y1),
self._num(x2), self._num(y2)),
fill=self.foreground) # self.line_width
def _rectangle(self, x1, y1, x2, y2):
"""\
Draw a rectangle, coordinates given as four decimal numbers.
``style`` is inserted in the SVG. It could be e.g. "fill:yellow"
"""
self.draw.rectangle((self._num(x1), self._num(y1),
self._num(x2), self._num(y2)),
fill=self.fillcolor,
outline=self.foreground) # self.line_width
# - - - - - - visitor function for the different shape types - - - - - - -
def visit_point(self, point):
dotsize = 2
self.draw.ellipse(
(
self._num(point.x) - dotsize, self._num(point.y) - dotsize,
self._num(point.x) + dotsize, self._num(point.y) + dotsize
),
fill=self.foreground
)
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)
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.draw.ellipse(
(
self._num(circle.center.x - circle.radius), self._num(circle.center.y - circle.radius),
self._num(circle.center.x + circle.radius), self._num(circle.center.y + circle.radius)
),
fill=self.fillcolor,
outline=self.foreground,
)
def visit_label(self, label):
# font-weight="bold"
self.draw.text(
(self._num(label.position.x), self._num(label.position.y - self.aa_image.nominal_size * 1.1)),
label.text,
fill=self.foreground,
font=self.font
)
def _bezier(self, p1, c1, c2, p2, level=1):
# de Casteljau's algorithm
if self._num(p1.distance(p2)) <= 3:
self._line(p1.x, p1.y, p2.x, p2.y)
else:
cmid = c1.midpoint(c2)
lp1 = p1
lc1 = p1.midpoint(c1)
lc2 = lc1.midpoint(cmid)
rp2 = p2
rc2 = p2.midpoint(c2)
rc1 = rc2.midpoint(cmid)
lp2 = rc1.midpoint(lc2)
rp1 = lp2
self._bezier(lp1, lc1, lc2, lp2, level + 1)
self._bezier(rp1, rc1, rc2, rp2, level + 1)
def visit_arc(self, arc):
p1, p2 = arc.start, arc.end
c1 = arc.start_control_point()
c2 = arc.end_control_point()
self._bezier(p1, c1, c2, p2)
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