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182 lines
5.2 KiB
182 lines
5.2 KiB
import re
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def _prefer_non_zero(*args):
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for arg in args:
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if arg != 0:
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return arg
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return 0.
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def _ntos(n):
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# %f likes to add unnecessary 0's, %g isn't consistent about # decimals
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return ('%.3f' % n).rstrip('0').rstrip('.')
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def _strip_xml_ns(tag):
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# ElementTree API doesn't provide a way to ignore XML namespaces in tags
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# so we here strip them ourselves: cf. https://bugs.python.org/issue18304
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return tag.split('}', 1)[1] if '}' in tag else tag
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def _transform(raw_value):
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# TODO assumes a 'matrix' transform.
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# No other transform functions are supported at the moment.
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# https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/transform
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# start simple: if you aren't exactly matrix(...) then no love
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match = re.match(r'matrix\((.*)\)', raw_value)
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if not match:
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raise NotImplementedError
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matrix = tuple(float(p) for p in re.split(r'\s+|,', match.group(1)))
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if len(matrix) != 6:
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raise ValueError('wrong # of terms in %s' % raw_value)
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return matrix
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class PathBuilder(object):
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def __init__(self):
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self.paths = []
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self.transforms = []
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def _start_path(self, initial_path=''):
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self.paths.append(initial_path)
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self.transforms.append(None)
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def _end_path(self):
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self._add('z')
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def _add(self, path_snippet):
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path = self.paths[-1]
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if path:
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path += ' ' + path_snippet
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else:
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path = path_snippet
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self.paths[-1] = path
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def _move(self, c, x, y):
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self._add('%s%s,%s' % (c, _ntos(x), _ntos(y)))
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def M(self, x, y):
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self._move('M', x, y)
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def m(self, x, y):
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self._move('m', x, y)
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def _arc(self, c, rx, ry, x, y, large_arc):
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self._add('%s%s,%s 0 %d 1 %s,%s' % (c, _ntos(rx), _ntos(ry), large_arc,
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_ntos(x), _ntos(y)))
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def A(self, rx, ry, x, y, large_arc=0):
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self._arc('A', rx, ry, x, y, large_arc)
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def a(self, rx, ry, x, y, large_arc=0):
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self._arc('a', rx, ry, x, y, large_arc)
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def _vhline(self, c, x):
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self._add('%s%s' % (c, _ntos(x)))
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def H(self, x):
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self._vhline('H', x)
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def h(self, x):
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self._vhline('h', x)
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def V(self, y):
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self._vhline('V', y)
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def v(self, y):
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self._vhline('v', y)
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def _line(self, c, x, y):
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self._add('%s%s,%s' % (c, _ntos(x), _ntos(y)))
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def L(self, x, y):
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self._line('L', x, y)
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def l(self, x, y):
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self._line('l', x, y)
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def _parse_line(self, line):
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x1 = float(line.attrib.get('x1', 0))
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y1 = float(line.attrib.get('y1', 0))
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x2 = float(line.attrib.get('x2', 0))
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y2 = float(line.attrib.get('y2', 0))
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self._start_path()
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self.M(x1, y1)
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self.L(x2, y2)
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def _parse_rect(self, rect):
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x = float(rect.attrib.get('x', 0))
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y = float(rect.attrib.get('y', 0))
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w = float(rect.attrib.get('width'))
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h = float(rect.attrib.get('height'))
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rx = float(rect.attrib.get('rx', 0))
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ry = float(rect.attrib.get('ry', 0))
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rx = _prefer_non_zero(rx, ry)
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ry = _prefer_non_zero(ry, rx)
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# TODO there are more rules for adjusting rx, ry
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self._start_path()
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self.M(x + rx, y)
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self.H(x + w - rx)
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if rx > 0:
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self.A(rx, ry, x + w, y + ry)
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self.V(y + h - ry)
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if rx > 0:
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self.A(rx, ry, x + w - rx, y + h)
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self.H(x + rx)
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if rx > 0:
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self.A(rx, ry, x, y + h - ry)
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self.V(y + ry)
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if rx > 0:
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self.A(rx, ry, x + rx, y)
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self._end_path()
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def _parse_path(self, path):
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if 'd' in path.attrib:
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self._start_path(initial_path=path.attrib['d'])
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def _parse_polygon(self, poly):
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if 'points' in poly.attrib:
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self._start_path('M' + poly.attrib['points'])
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self._end_path()
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def _parse_polyline(self, poly):
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if 'points' in poly.attrib:
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self._start_path('M' + poly.attrib['points'])
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def _parse_circle(self, circle):
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cx = float(circle.attrib.get('cx', 0))
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cy = float(circle.attrib.get('cy', 0))
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r = float(circle.attrib.get('r'))
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# arc doesn't seem to like being a complete shape, draw two halves
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self._start_path()
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self.M(cx - r, cy)
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self.A(r, r, cx + r, cy, large_arc=1)
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self.A(r, r, cx - r, cy, large_arc=1)
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def _parse_ellipse(self, ellipse):
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cx = float(ellipse.attrib.get('cx', 0))
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cy = float(ellipse.attrib.get('cy', 0))
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rx = float(ellipse.attrib.get('rx'))
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ry = float(ellipse.attrib.get('ry'))
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# arc doesn't seem to like being a complete shape, draw two halves
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self._start_path()
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self.M(cx - rx, cy)
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self.A(rx, ry, cx + rx, cy, large_arc=1)
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self.A(rx, ry, cx - rx, cy, large_arc=1)
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def add_path_from_element(self, el):
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tag = _strip_xml_ns(el.tag)
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parse_fn = getattr(self, '_parse_%s' % tag.lower(), None)
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if not callable(parse_fn):
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return False
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parse_fn(el)
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if 'transform' in el.attrib:
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self.transforms[-1] = _transform(el.attrib['transform'])
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return True
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