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Bezier-rs: Add curvature and rotate functions to subpath (#1081)

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* Add rotate and curvature

* Fix comments

* Fix case where curve is linear

* Address comments

* Fixed breakages caused by UI updates

* Scootch rotation point to center in frame

* Code review

* Visualize t value point when segment is linear

---------

Co-authored-by: Rob Nadal <robnadal44@gmail.com>
Co-authored-by: Keavon Chambers <keavon@keavon.com>
This commit is contained in:
Linda Zheng
2023-03-27 19:35:57 -04:00
committed by Keavon Chambers
co-authored by Rob Nadal Keavon Chambers
parent 3f8adbafba
commit d0ac86b713
8 changed files with 116 additions and 31 deletions
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libraries/bezier-rs/src/subpath/transform.rs
+23
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@@ -333,6 +333,29 @@ impl<ManipulatorGroupId: crate::Identifier> Subpath<ManipulatorGroupId> {
Some((clipped_subpath1, clipped_subpath2.unwrap()))
}
/// Returns a subpath that results from rotating this subpath around the origin by the given angle (in radians).
/// <iframe frameBorder="0" width="100%" height="375px" src="https://graphite.rs/bezier-rs-demos#subpath/rotate/solo" title="Rotate Demo"></iframe>
pub fn rotate(&self, angle: f64) -> Subpath<ManipulatorGroupId> {
let mut rotated_subpath = self.clone();
let affine_transform: DAffine2 = DAffine2::from_angle(angle);
rotated_subpath.apply_transform(affine_transform);
rotated_subpath
}
/// Returns a subpath that results from rotating this subpath around the provided point by the given angle (in radians).
pub fn rotate_about_point(&self, angle: f64, pivot: DVec2) -> Subpath<ManipulatorGroupId> {
// Translate before and after the rotation to account for the pivot
let translate: DAffine2 = DAffine2::from_translation(pivot);
let rotate: DAffine2 = DAffine2::from_angle(angle);
let translate_inverse = translate.inverse();
let mut rotated_subpath = self.clone();
rotated_subpath.apply_transform(translate * rotate * translate_inverse);
rotated_subpath
}
/// Reduces the segments of the subpath into simple subcurves, then scales each subcurve a set `distance` away.
/// The intersections of segments of the subpath are joined using the method specified by the `join` argument.
/// <iframe frameBorder="0" width="100%" height="400px" src="https://graphite.rs/bezier-rs-demos#subpath/offset/solo" title="Offset Demo"></iframe>