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Deprecate BezPath::flatten, prefer flatten.
The free-standing function is more useful as it works on a wider range of types. The `BezPath` method has the documentation though and is just a wrapper around the free-standing function. Most people will want to use the free-standing function, so we can encourage that and make that the place where the docs live.
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‎CHANGELOG.md

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@@ -24,6 +24,7 @@ This release has an [MSRV][] of 1.65.
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- Move `Self: Sized` bound from `Shape` to methods. ([#340] by [@waywardmonkeys])
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- Enable partial SVG path support in `no_std` builds. ([#356] by [@waywardmonkeys])
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- Deprecate `BezPath::flatten`, prefer `flatten`. ([#361] by [@waywardmonkeys])
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### Fixed
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@@ -50,7 +51,11 @@ Note: A changelog was not kept for or before this release
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[#343]: https://github.com/linebender/kurbo/pull/343
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[#347]: https://github.com/linebender/kurbo/pull/347
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[#354]: https://github.com/linebender/kurbo/pull/354
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<<<<<<< HEAD
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[#356]: https://github.com/linebender/kurbo/pull/356
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=======
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[#361]: https://github.com/linebender/kurbo/pull/361
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>>>>>>> d7f955a (Deprecate `BezPath::flatten`, prefer `flatten`.)
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[Unreleased]: https://github.com/linebender/kurbo/compare/v0.11.0...HEAD
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[0.11.0]: https://github.com/linebender/kurbo/releases/tag/v0.11.0

‎src/bezpath.rs

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@@ -95,7 +95,7 @@ use crate::common::FloatFuncs;
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/// [A Primer on Bézier Curves]: https://pomax.github.io/bezierinfo/
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/// [`iter`]: BezPath::iter
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/// [`segments`]: BezPath::segments
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/// [`flatten`]: BezPath::flatten
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/// [`flatten`]: flatten
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/// [`intersect_line`]: PathSeg::intersect_line
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/// [`segments` free function]: segments
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/// [`FromIterator<PathEl>`]: std::iter::FromIterator
@@ -290,72 +290,8 @@ impl BezPath {
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/// Flatten the path, invoking the callback repeatedly.
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///
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/// Flattening is the action of approximating a curve with a succession of line segments.
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///
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/// <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 120 30" height="30mm" width="120mm">
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/// <path d="M26.7 24.94l.82-11.15M44.46 5.1L33.8 7.34" fill="none" stroke="#55d400" stroke-width=".5"/>
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/// <path d="M26.7 24.94c.97-11.13 7.17-17.6 17.76-19.84M75.27 24.94l1.13-5.5 2.67-5.48 4-4.42L88 6.7l5.02-1.6" fill="none" stroke="#000"/>
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/// <path d="M77.57 19.37a1.1 1.1 0 0 1-1.08 1.08 1.1 1.1 0 0 1-1.1-1.08 1.1 1.1 0 0 1 1.08-1.1 1.1 1.1 0 0 1 1.1 1.1" color="#000" fill="none" stroke="#030303" stroke-linecap="round" stroke-opacity=".5"/>
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/// <path d="M77.57 19.37a1.1 1.1 0 0 1-1.08 1.08 1.1 1.1 0 0 1-1.1-1.08 1.1 1.1 0 0 1 1.08-1.1 1.1 1.1 0 0 1 1.1 1.1" color="#000" fill="#fff"/>
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/// <path d="M80.22 13.93a1.1 1.1 0 0 1-1.1 1.1 1.1 1.1 0 0 1-1.08-1.1 1.1 1.1 0 0 1 1.1-1.08 1.1 1.1 0 0 1 1.08 1.08" color="#000" fill="none" stroke="#030303" stroke-linecap="round" stroke-opacity=".5"/>
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/// <path d="M80.22 13.93a1.1 1.1 0 0 1-1.1 1.1 1.1 1.1 0 0 1-1.08-1.1 1.1 1.1 0 0 1 1.1-1.08 1.1 1.1 0 0 1 1.08 1.08" color="#000" fill="#fff"/>
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/// <path d="M84.08 9.55a1.1 1.1 0 0 1-1.08 1.1 1.1 1.1 0 0 1-1.1-1.1 1.1 1.1 0 0 1 1.1-1.1 1.1 1.1 0 0 1 1.08 1.1" color="#000" fill="none" stroke="#030303" stroke-linecap="round" stroke-opacity=".5"/>
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/// <path d="M84.08 9.55a1.1 1.1 0 0 1-1.08 1.1 1.1 1.1 0 0 1-1.1-1.1 1.1 1.1 0 0 1 1.1-1.1 1.1 1.1 0 0 1 1.08 1.1" color="#000" fill="#fff"/>
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/// <path d="M89.1 6.66a1.1 1.1 0 0 1-1.08 1.1 1.1 1.1 0 0 1-1.08-1.1 1.1 1.1 0 0 1 1.08-1.08 1.1 1.1 0 0 1 1.1 1.08" color="#000" fill="none" stroke="#030303" stroke-linecap="round" stroke-opacity=".5"/>
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/// <path d="M89.1 6.66a1.1 1.1 0 0 1-1.08 1.1 1.1 1.1 0 0 1-1.08-1.1 1.1 1.1 0 0 1 1.08-1.08 1.1 1.1 0 0 1 1.1 1.08" color="#000" fill="#fff"/>
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/// <path d="M94.4 5a1.1 1.1 0 0 1-1.1 1.1A1.1 1.1 0 0 1 92.23 5a1.1 1.1 0 0 1 1.08-1.08A1.1 1.1 0 0 1 94.4 5" color="#000" fill="none" stroke="#030303" stroke-linecap="round" stroke-opacity=".5"/>
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/// <path d="M94.4 5a1.1 1.1 0 0 1-1.1 1.1A1.1 1.1 0 0 1 92.23 5a1.1 1.1 0 0 1 1.08-1.08A1.1 1.1 0 0 1 94.4 5" color="#000" fill="#fff"/>
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/// <path d="M76.44 25.13a1.1 1.1 0 0 1-1.1 1.1 1.1 1.1 0 0 1-1.08-1.1 1.1 1.1 0 0 1 1.1-1.1 1.1 1.1 0 0 1 1.08 1.1" color="#000" fill="none" stroke="#030303" stroke-linecap="round" stroke-opacity=".5"/>
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/// <path d="M76.44 25.13a1.1 1.1 0 0 1-1.1 1.1 1.1 1.1 0 0 1-1.08-1.1 1.1 1.1 0 0 1 1.1-1.1 1.1 1.1 0 0 1 1.08 1.1" color="#000" fill="#fff"/>
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/// <path d="M27.78 24.9a1.1 1.1 0 0 1-1.08 1.08 1.1 1.1 0 0 1-1.1-1.08 1.1 1.1 0 0 1 1.1-1.1 1.1 1.1 0 0 1 1.08 1.1" color="#000" fill="none" stroke="#030303" stroke-linecap="round" stroke-opacity=".5"/>
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/// <path d="M27.78 24.9a1.1 1.1 0 0 1-1.08 1.08 1.1 1.1 0 0 1-1.1-1.08 1.1 1.1 0 0 1 1.1-1.1 1.1 1.1 0 0 1 1.08 1.1" color="#000" fill="#fff"/>
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/// <path d="M45.4 5.14a1.1 1.1 0 0 1-1.08 1.1 1.1 1.1 0 0 1-1.1-1.1 1.1 1.1 0 0 1 1.1-1.08 1.1 1.1 0 0 1 1.1 1.08" color="#000" fill="none" stroke="#030303" stroke-linecap="round" stroke-opacity=".5"/>
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/// <path d="M45.4 5.14a1.1 1.1 0 0 1-1.08 1.1 1.1 1.1 0 0 1-1.1-1.1 1.1 1.1 0 0 1 1.1-1.08 1.1 1.1 0 0 1 1.1 1.08" color="#000" fill="#fff"/>
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/// <path d="M28.67 13.8a1.1 1.1 0 0 1-1.1 1.08 1.1 1.1 0 0 1-1.08-1.08 1.1 1.1 0 0 1 1.08-1.1 1.1 1.1 0 0 1 1.1 1.1" color="#000" fill="none" stroke="#030303" stroke-linecap="round" stroke-opacity=".5"/>
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/// <path d="M28.67 13.8a1.1 1.1 0 0 1-1.1 1.08 1.1 1.1 0 0 1-1.08-1.08 1.1 1.1 0 0 1 1.08-1.1 1.1 1.1 0 0 1 1.1 1.1" color="#000" fill="#fff"/>
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/// <path d="M35 7.32a1.1 1.1 0 0 1-1.1 1.1 1.1 1.1 0 0 1-1.08-1.1 1.1 1.1 0 0 1 1.1-1.1A1.1 1.1 0 0 1 35 7.33" color="#000" fill="none" stroke="#030303" stroke-linecap="round" stroke-opacity=".5"/>
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/// <path d="M35 7.32a1.1 1.1 0 0 1-1.1 1.1 1.1 1.1 0 0 1-1.08-1.1 1.1 1.1 0 0 1 1.1-1.1A1.1 1.1 0 0 1 35 7.33" color="#000" fill="#fff"/>
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/// <text style="line-height:6.61458302px" x="35.74" y="284.49" font-size="5.29" font-family="Sans" letter-spacing="0" word-spacing="0" fill="#b3b3b3" stroke-width=".26" transform="translate(19.595 -267)">
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/// <tspan x="35.74" y="284.49" font-size="10.58">→</tspan>
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/// </text>
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/// </svg>
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///
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/// The tolerance value controls the maximum distance between the curved input
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/// segments and their polyline approximations. (In technical terms, this is the
325-
/// Hausdorff distance). The algorithm attempts to bound this distance between
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/// by `tolerance` but this is not absolutely guaranteed. The appropriate value
327-
/// depends on the use, but for antialiased rendering, a value of 0.25 has been
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/// determined to give good results. The number of segments tends to scale as the
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/// inverse square root of tolerance.
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///
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/// <svg viewBox="0 0 47.5 13.2" height="100" width="350" xmlns="http://www.w3.org/2000/svg">
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/// <path d="M-2.44 9.53c16.27-8.5 39.68-7.93 52.13 1.9" fill="none" stroke="#dde9af" stroke-width="4.6"/>
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/// <path d="M-1.97 9.3C14.28 1.03 37.36 1.7 49.7 11.4" fill="none" stroke="#00d400" stroke-width=".57" stroke-linecap="round" stroke-dasharray="4.6, 2.291434"/>
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/// <path d="M-1.94 10.46L6.2 6.08l28.32-1.4 15.17 6.74" fill="none" stroke="#000" stroke-width=".6"/>
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/// <path d="M6.83 6.57a.9.9 0 0 1-1.25.15.9.9 0 0 1-.15-1.25.9.9 0 0 1 1.25-.15.9.9 0 0 1 .15 1.25" color="#000" stroke="#000" stroke-width=".57" stroke-linecap="round" stroke-opacity=".5"/>
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/// <path d="M35.35 5.3a.9.9 0 0 1-1.25.15.9.9 0 0 1-.15-1.25.9.9 0 0 1 1.25-.15.9.9 0 0 1 .15 1.24" color="#000" stroke="#000" stroke-width=".6" stroke-opacity=".5"/>
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/// <g fill="none" stroke="#ff7f2a" stroke-width=".26">
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/// <path d="M20.4 3.8l.1 1.83M19.9 4.28l.48-.56.57.52M21.02 5.18l-.5.56-.6-.53" stroke-width=".2978872"/>
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/// </g>
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/// </svg>
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///
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/// The callback will be called in order with each element of the generated
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/// path. Because the result is made of polylines, these will be straight-line
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/// path elements only, no curves.
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///
346-
/// This algorithm is based on the blog post [Flattening quadratic Béziers]
347-
/// but with some refinements. For one, there is a more careful approximation
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/// at cusps. For two, the algorithm is extended to work with cubic Béziers
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/// as well, by first subdividing into quadratics and then computing the
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/// subdivision of each quadratic. However, as a clever trick, these quadratics
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/// are subdivided fractionally, and their endpoints are not included.
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///
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/// TODO: write a paper explaining this in more detail.
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///
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/// Note: the [`flatten`] function provides the same
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/// functionality but works with slices and other [`PathEl`] iterators.
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///
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/// [Flattening quadratic Béziers]: https://raphlinus.github.io/graphics/curves/2019/12/23/flatten-quadbez.html
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/// See [`flatten`] for more discussion.
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#[deprecated(since = "0.11.1", note = "use the free function flatten instead")]
359295
pub fn flatten(&self, tolerance: f64, callback: impl FnMut(PathEl)) {
360296
flatten(self, tolerance, callback);
361297
}
@@ -551,9 +487,69 @@ const TO_QUAD_TOL: f64 = 0.1;
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552488
/// Flatten the path, invoking the callback repeatedly.
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///
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/// See [`BezPath::flatten`] for more discussion.
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/// This signature is a bit more general, allowing flattening of `&[PathEl]` slices
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/// and other iterators yielding `PathEl`.
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/// Flattening is the action of approximating a curve with a succession of line segments.
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///
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/// <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 120 30" height="30mm" width="120mm">
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/// <path d="M26.7 24.94l.82-11.15M44.46 5.1L33.8 7.34" fill="none" stroke="#55d400" stroke-width=".5"/>
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/// <path d="M26.7 24.94c.97-11.13 7.17-17.6 17.76-19.84M75.27 24.94l1.13-5.5 2.67-5.48 4-4.42L88 6.7l5.02-1.6" fill="none" stroke="#000"/>
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/// <path d="M77.57 19.37a1.1 1.1 0 0 1-1.08 1.08 1.1 1.1 0 0 1-1.1-1.08 1.1 1.1 0 0 1 1.08-1.1 1.1 1.1 0 0 1 1.1 1.1" color="#000" fill="none" stroke="#030303" stroke-linecap="round" stroke-opacity=".5"/>
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/// <path d="M77.57 19.37a1.1 1.1 0 0 1-1.08 1.08 1.1 1.1 0 0 1-1.1-1.08 1.1 1.1 0 0 1 1.08-1.1 1.1 1.1 0 0 1 1.1 1.1" color="#000" fill="#fff"/>
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/// <path d="M80.22 13.93a1.1 1.1 0 0 1-1.1 1.1 1.1 1.1 0 0 1-1.08-1.1 1.1 1.1 0 0 1 1.1-1.08 1.1 1.1 0 0 1 1.08 1.08" color="#000" fill="none" stroke="#030303" stroke-linecap="round" stroke-opacity=".5"/>
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/// <path d="M80.22 13.93a1.1 1.1 0 0 1-1.1 1.1 1.1 1.1 0 0 1-1.08-1.1 1.1 1.1 0 0 1 1.1-1.08 1.1 1.1 0 0 1 1.08 1.08" color="#000" fill="#fff"/>
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/// <path d="M84.08 9.55a1.1 1.1 0 0 1-1.08 1.1 1.1 1.1 0 0 1-1.1-1.1 1.1 1.1 0 0 1 1.1-1.1 1.1 1.1 0 0 1 1.08 1.1" color="#000" fill="none" stroke="#030303" stroke-linecap="round" stroke-opacity=".5"/>
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/// <path d="M84.08 9.55a1.1 1.1 0 0 1-1.08 1.1 1.1 1.1 0 0 1-1.1-1.1 1.1 1.1 0 0 1 1.1-1.1 1.1 1.1 0 0 1 1.08 1.1" color="#000" fill="#fff"/>
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/// <path d="M89.1 6.66a1.1 1.1 0 0 1-1.08 1.1 1.1 1.1 0 0 1-1.08-1.1 1.1 1.1 0 0 1 1.08-1.08 1.1 1.1 0 0 1 1.1 1.08" color="#000" fill="none" stroke="#030303" stroke-linecap="round" stroke-opacity=".5"/>
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/// <path d="M89.1 6.66a1.1 1.1 0 0 1-1.08 1.1 1.1 1.1 0 0 1-1.08-1.1 1.1 1.1 0 0 1 1.08-1.08 1.1 1.1 0 0 1 1.1 1.08" color="#000" fill="#fff"/>
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/// <path d="M94.4 5a1.1 1.1 0 0 1-1.1 1.1A1.1 1.1 0 0 1 92.23 5a1.1 1.1 0 0 1 1.08-1.08A1.1 1.1 0 0 1 94.4 5" color="#000" fill="none" stroke="#030303" stroke-linecap="round" stroke-opacity=".5"/>
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/// <path d="M94.4 5a1.1 1.1 0 0 1-1.1 1.1A1.1 1.1 0 0 1 92.23 5a1.1 1.1 0 0 1 1.08-1.08A1.1 1.1 0 0 1 94.4 5" color="#000" fill="#fff"/>
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/// <path d="M76.44 25.13a1.1 1.1 0 0 1-1.1 1.1 1.1 1.1 0 0 1-1.08-1.1 1.1 1.1 0 0 1 1.1-1.1 1.1 1.1 0 0 1 1.08 1.1" color="#000" fill="none" stroke="#030303" stroke-linecap="round" stroke-opacity=".5"/>
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/// <path d="M76.44 25.13a1.1 1.1 0 0 1-1.1 1.1 1.1 1.1 0 0 1-1.08-1.1 1.1 1.1 0 0 1 1.1-1.1 1.1 1.1 0 0 1 1.08 1.1" color="#000" fill="#fff"/>
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/// <path d="M27.78 24.9a1.1 1.1 0 0 1-1.08 1.08 1.1 1.1 0 0 1-1.1-1.08 1.1 1.1 0 0 1 1.1-1.1 1.1 1.1 0 0 1 1.08 1.1" color="#000" fill="none" stroke="#030303" stroke-linecap="round" stroke-opacity=".5"/>
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/// <path d="M27.78 24.9a1.1 1.1 0 0 1-1.08 1.08 1.1 1.1 0 0 1-1.1-1.08 1.1 1.1 0 0 1 1.1-1.1 1.1 1.1 0 0 1 1.08 1.1" color="#000" fill="#fff"/>
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/// <path d="M45.4 5.14a1.1 1.1 0 0 1-1.08 1.1 1.1 1.1 0 0 1-1.1-1.1 1.1 1.1 0 0 1 1.1-1.08 1.1 1.1 0 0 1 1.1 1.08" color="#000" fill="none" stroke="#030303" stroke-linecap="round" stroke-opacity=".5"/>
510+
/// <path d="M45.4 5.14a1.1 1.1 0 0 1-1.08 1.1 1.1 1.1 0 0 1-1.1-1.1 1.1 1.1 0 0 1 1.1-1.08 1.1 1.1 0 0 1 1.1 1.08" color="#000" fill="#fff"/>
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/// <path d="M28.67 13.8a1.1 1.1 0 0 1-1.1 1.08 1.1 1.1 0 0 1-1.08-1.08 1.1 1.1 0 0 1 1.08-1.1 1.1 1.1 0 0 1 1.1 1.1" color="#000" fill="none" stroke="#030303" stroke-linecap="round" stroke-opacity=".5"/>
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/// <path d="M28.67 13.8a1.1 1.1 0 0 1-1.1 1.08 1.1 1.1 0 0 1-1.08-1.08 1.1 1.1 0 0 1 1.08-1.1 1.1 1.1 0 0 1 1.1 1.1" color="#000" fill="#fff"/>
513+
/// <path d="M35 7.32a1.1 1.1 0 0 1-1.1 1.1 1.1 1.1 0 0 1-1.08-1.1 1.1 1.1 0 0 1 1.1-1.1A1.1 1.1 0 0 1 35 7.33" color="#000" fill="none" stroke="#030303" stroke-linecap="round" stroke-opacity=".5"/>
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/// <path d="M35 7.32a1.1 1.1 0 0 1-1.1 1.1 1.1 1.1 0 0 1-1.08-1.1 1.1 1.1 0 0 1 1.1-1.1A1.1 1.1 0 0 1 35 7.33" color="#000" fill="#fff"/>
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/// <text style="line-height:6.61458302px" x="35.74" y="284.49" font-size="5.29" font-family="Sans" letter-spacing="0" word-spacing="0" fill="#b3b3b3" stroke-width=".26" transform="translate(19.595 -267)">
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/// <tspan x="35.74" y="284.49" font-size="10.58">→</tspan>
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/// </text>
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/// </svg>
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///
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/// The tolerance value controls the maximum distance between the curved input
521+
/// segments and their polyline approximations. (In technical terms, this is the
522+
/// Hausdorff distance). The algorithm attempts to bound this distance between
523+
/// by `tolerance` but this is not absolutely guaranteed. The appropriate value
524+
/// depends on the use, but for antialiased rendering, a value of 0.25 has been
525+
/// determined to give good results. The number of segments tends to scale as the
526+
/// inverse square root of tolerance.
527+
///
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/// <svg viewBox="0 0 47.5 13.2" height="100" width="350" xmlns="http://www.w3.org/2000/svg">
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/// <path d="M-2.44 9.53c16.27-8.5 39.68-7.93 52.13 1.9" fill="none" stroke="#dde9af" stroke-width="4.6"/>
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/// <path d="M-1.97 9.3C14.28 1.03 37.36 1.7 49.7 11.4" fill="none" stroke="#00d400" stroke-width=".57" stroke-linecap="round" stroke-dasharray="4.6, 2.291434"/>
531+
/// <path d="M-1.94 10.46L6.2 6.08l28.32-1.4 15.17 6.74" fill="none" stroke="#000" stroke-width=".6"/>
532+
/// <path d="M6.83 6.57a.9.9 0 0 1-1.25.15.9.9 0 0 1-.15-1.25.9.9 0 0 1 1.25-.15.9.9 0 0 1 .15 1.25" color="#000" stroke="#000" stroke-width=".57" stroke-linecap="round" stroke-opacity=".5"/>
533+
/// <path d="M35.35 5.3a.9.9 0 0 1-1.25.15.9.9 0 0 1-.15-1.25.9.9 0 0 1 1.25-.15.9.9 0 0 1 .15 1.24" color="#000" stroke="#000" stroke-width=".6" stroke-opacity=".5"/>
534+
/// <g fill="none" stroke="#ff7f2a" stroke-width=".26">
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/// <path d="M20.4 3.8l.1 1.83M19.9 4.28l.48-.56.57.52M21.02 5.18l-.5.56-.6-.53" stroke-width=".2978872"/>
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/// </g>
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/// </svg>
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///
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/// The callback will be called in order with each element of the generated
540+
/// path. Because the result is made of polylines, these will be straight-line
541+
/// path elements only, no curves.
542+
///
543+
/// This algorithm is based on the blog post [Flattening quadratic Béziers]
544+
/// but with some refinements. For one, there is a more careful approximation
545+
/// at cusps. For two, the algorithm is extended to work with cubic Béziers
546+
/// as well, by first subdividing into quadratics and then computing the
547+
/// subdivision of each quadratic. However, as a clever trick, these quadratics
548+
/// are subdivided fractionally, and their endpoints are not included.
549+
///
550+
/// TODO: write a paper explaining this in more detail.
551+
///
552+
/// [Flattening quadratic Béziers]: https://raphlinus.github.io/graphics/curves/2019/12/23/flatten-quadbez.html
557553
pub fn flatten(
558554
path: impl IntoIterator<Item = PathEl>,
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tolerance: f64,

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