Python arc_segment_count Examples

Example #1

File: test_645_construction_arc.py Project: yening2020/ezdxf

def test_arc_segment_count():
    radius = 100
    max_sagitta = 2
    assert arc_segment_count(radius, math.tau, max_sagitta) == 16
    alpha = math.tau / 16
    l2 = math.sin(alpha / 2) * radius
    sagitta = radius - math.sqrt(radius**2 - l2**2)
    assert max_sagitta / 2 < sagitta < max_sagitta

Example #2

    def flattening(self, sagitta: float) -> Iterable[Vec3]:
        """Approximate the circle by vertices in WCS, argument `sagitta` is the
        max. distance from the center of an arc segment to the center of its
        chord. Returns a closed polygon: start vertex == end vertex!

        Yields always :class:`~ezdxf.math.Vec3` objects.

        .. versionadded:: 0.15

        """
        radius = abs(self.dxf.radius)
        if radius > 0.0:
            count = arc_segment_count(radius, math.tau, sagitta)
            yield from self.vertices(linspace(0.0, 360.0, count + 1))