pub enum CurveKind {
Line {
start: PointId,
end: PointId,
},
Arc {
start: PointId,
end: PointId,
sweep: Scalar,
},
Circle {
center: PointId,
radius: Scalar,
},
Spline {
control_points: Vec<PointId>,
shape: Option<SplineShape>,
},
Text {
anchor: PointId,
text: String,
height: Scalar,
angle: Scalar,
},
}Variants§
Line
Arc
A circular arc from start to end, turning counter-clockwise by
sweep radians (clockwise if negative, |sweep| < 2π). Equivalent to
giving its curvature 2 sin(sweep / 2) / |end - start| — see
crate::geometry for why the sweep is what is stored and solved.
Circle
Spline
A clamped B-spline through its first and last control points: as
drawn, uniform and non-rational of degree
min(3, control_points.len() - 1); taken from elsewhere — an edge of
the part projected into the plane — any NURBS (see SplineShape).
Text
The outlines of text’s glyphs in the sketch font (see
crate::text): its first baseline from anchor on, its capitals
height tall, turned counter-clockwise by angle radians. Each of
a glyph’s closed contours is a loop of the profile — an o an
outline and a hole in it. Only its anchor is solved for: a text is
placed by constraining that point, and takes no constraint itself.