alternative_d.py

from svgpathtools import Line, CubicBezier, QuadraticBezier, Arc


# This is a modified version of the d function from svgpathtools.path.Path.d
# It allows rounding the float outputs
def alternative_d(self, useSandT=False, use_closed_attrib=False, rel=False):
    """Returns a path d-string for the path object.
    For an explanation of useSandT and use_closed_attrib, see the
    compatibility notes in the README."""
    if len(self) == 0:
        return ''
    if use_closed_attrib:
        self_closed = self.iscontinuous() and self.isclosed()
        if self_closed:
            segments = self[:-1]
        else:
            segments = self[:]
    else:
        self_closed = False
        segments = self[:]

    current_pos = None
    parts = []
    previous_segment = None
    end = self[-1].end

    for segment in segments:
        seg_start = segment.start
        # If the start of this segment does not coincide with the end of
        # the last segment or if this segment is actually the close point
        # of a closed path, then we should start a new subpath here.
        if current_pos != seg_start or \
                (self_closed and seg_start == end and use_closed_attrib):
            if rel:
                _seg_start = seg_start - current_pos if current_pos is not None else seg_start
            else:
                _seg_start = seg_start
            parts.append('M {:g},{:g}'.format(_seg_start.real, _seg_start.imag))

        if isinstance(segment, Line):
            if rel:
                _seg_end = segment.end - seg_start
            else:
                _seg_end = segment.end
            parts.append('L {:g},{:g}'.format(_seg_end.real, _seg_end.imag))
        elif isinstance(segment, CubicBezier):
            if useSandT and segment.is_smooth_from(previous_segment,
                                                    warning_on=False):
                if rel:
                    _seg_control2 = segment.control2 - seg_start
                    _seg_end = segment.end - seg_start
                else:
                    _seg_control2 = segment.control2
                    _seg_end = segment.end
                args = (_seg_control2.real, _seg_control2.imag,
                        _seg_end.real, _seg_end.imag)
                parts.append('S {:g},{:g} {:g},{:g}'.format(*args))
            else:
                if rel:
                    _seg_control1 = segment.control1 - seg_start
                    _seg_control2 = segment.control2 - seg_start
                    _seg_end = segment.end - seg_start
                else:
                    _seg_control1 = segment.control1
                    _seg_control2 = segment.control2
                    _seg_end = segment.end
                args = (_seg_control1.real, _seg_control1.imag,
                        _seg_control2.real, _seg_control2.imag,
                        _seg_end.real, _seg_end.imag)
                parts.append('C {:g},{:g} {:g},{:g} {:g},{:g}'.format(*args))
        elif isinstance(segment, QuadraticBezier):
            if useSandT and segment.is_smooth_from(previous_segment,
                                                    warning_on=False):
                if rel:
                    _seg_end = segment.end - seg_start
                else:
                    _seg_end = segment.end
                args = _seg_end.real, _seg_end.imag
                parts.append('T {:g},{:g}'.format(*args))
            else:
                if rel:
                    _seg_control = segment.control - seg_start
                    _seg_end = segment.end - seg_start
                else:
                    _seg_control = segment.control
                    _seg_end = segment.end
                args = (_seg_control.real, _seg_control.imag,
                        _seg_end.real, _seg_end.imag)
                parts.append('Q {:g},{:g} {:g},{:g}'.format(*args))

        elif isinstance(segment, Arc):
            if rel:
                _seg_end = segment.end - seg_start
            else:
                _seg_end = segment.end
            args = (segment.radius.real, segment.radius.imag,
                    segment.rotation,int(segment.large_arc),
                    int(segment.sweep),_seg_end.real, _seg_end.imag)
            parts.append('A {:g},{:g} {:g} {:d},{:d} {:g},{:g}'.format(*args))
        current_pos = segment.end
        previous_segment = segment

    if self_closed:
        parts.append('Z')

    s = ' '.join(parts)
    return s if not rel else s.lower()