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Bezier-rs: continue converting demos from canvas to SVG (#779)

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* Convert constructor to use svg

* Convert the through_points functions to svg

* Convert length, lut, derivative, and tangent from canvas to svg

* Fixed bug when t1 == t2 in split

* Converted split and trim to use svg representation, and swapped slider options default to use quadratic options

* Convert normal and curvature to use svg representation in bezier-rs-demos

* Convert the project function to use svg representation in bezier-rs-demos

* Convert the local_extrema, bbox, and inflections to use svgs

* Add text offset constants

* Fix typo

Co-authored-by: Robert Nadal <Robnadal44@gmail.com>
Co-authored-by: Keavon Chambers <keavon@keavon.com>
This commit is contained in:
Hannah Li
2022-09-27 17:37:30 -07:00
committed by Keavon Chambers
parent e9cd792635
commit 55f6d13daf
8 changed files with 358 additions and 243 deletions
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11
libraries/bezier-rs/src/bezier/transform.rs
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@@ -1,4 +1,5 @@
use super::*;
use crate::utils::f64_compare;
use glam::DMat2;
use std::f64::consts::PI;
@@ -41,12 +42,20 @@ impl Bezier {
/// Returns the Bezier curve representing the sub-curve starting at the point corresponding to `t1` and ending at the point corresponding to `t2`.
pub fn trim(&self, t1: f64, t2: f64) -> Bezier {
if f64_compare(t1, t2, MAX_ABSOLUTE_DIFFERENCE) {
let point = self.evaluate(t1);
return match self.handles {
BezierHandles::Linear => Bezier::from_linear_dvec2(point, point),
BezierHandles::Quadratic { handle: _ } => Bezier::from_quadratic_dvec2(point, point, point),
BezierHandles::Cubic { handle_start: _, handle_end: _ } => Bezier::from_cubic_dvec2(point, point, point, point),
};
}
// Depending on the order of `t1` and `t2`, determine which half of the split we need to keep
let t1_split_side = if t1 <= t2 { 1 } else { 0 };
let t2_split_side = if t1 <= t2 { 0 } else { 1 };
let bezier_starting_at_t1 = self.split(t1)[t1_split_side];
// Adjust the ratio `t2` to its corresponding value on the new curve that was split on `t1`
let adjusted_t2 = if t1 < t2 || (t1 == t2 && t1 == 0.) {
let adjusted_t2 = if t1 < t2 || t1 == 0. {
// Case where we took the split from t1 to the end
// Also cover the `t1` == t2 case where there would otherwise be a divide by 0
(t2 - t1) / (1. - t1)