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Bezier-rs: Add project function for Subpaths (#914)

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* Added subpath project function

* Set appropriate project default in single manipulator group case

* Lint

* Return optional from subpath project + stylistic changes per review

Co-authored-by: Keavon Chambers <keavon@keavon.com>
This commit is contained in:
Rob Nadal
2022-12-29 18:32:22 -05:00
committed by Keavon Chambers
parent 0d703e857b
commit 72cd204c64
5 changed files with 59 additions and 5 deletions
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25
libraries/bezier-rs/src/subpath/lookup.rs
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@@ -1,4 +1,6 @@
use super::*;
use crate::{ComputeType, ProjectionOptions};
use glam::DVec2;
/// Functionality relating to looking up properties of the `Subpath` or points along the `Subpath`.
impl Subpath {
@@ -7,13 +9,32 @@ impl Subpath {
pub fn length(&self, num_subdivisions: Option<usize>) -> f64 {
self.iter().fold(0., |accumulator, bezier| accumulator + bezier.length(num_subdivisions))
}
/// Returns the segment index and `t` value that corresponds to the closest point on the curve to the provided point.
/// Uses a searching algorithm akin to binary search that can be customized using the [ProjectionOptions] structure.
pub fn project(&self, point: DVec2, options: ProjectionOptions) -> Option<(usize, f64)> {
if self.is_empty() {
return None;
}
// TODO: Optimization opportunity: Filter out segments which are *definitely* not the closest to the given point
let (index, (_, project_t)) = self
.iter()
.map(|bezier| {
let project_t = bezier.project(point, options);
(bezier.evaluate(ComputeType::Parametric(project_t)).distance(point), project_t)
})
.enumerate()
.min_by(|(_, (distance1, _)), (_, (distance2, _))| distance1.total_cmp(distance2))
.unwrap_or((0, (0., 0.))); // If the Subpath contains only a single manipulator group, returns (0, 0.)
Some((index, project_t))
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::Bezier;
use glam::DVec2;
#[test]
fn length_quadratic() {