donner::Path::MeasuredPath Class Reference

Precomputed arc-length index for repeated path sampling. More...

#include "donner/base/Path.h"

Public Types
enum class	BoundarySide : uint8_t {   Incoming ,   Outgoing }
	Side of a connected segment boundary used for its tangent and normal. More...

Public Member Functions
double	pathLength () const
	Return the total measured arc length, or infinity when the measurement is not valid.
PointOnPath	pointAtArcLength (double distance, BoundarySide boundarySide=BoundarySide::Incoming) const
	Sample this measured path at the given arc length.
std::vector< double >	segmentEndDistances () const
	Return an owning list of cumulative distances at the drawable segment endpoints.
std::size_t	segmentCount () const
	Number of drawable segments retained by this index.
bool	valid () const
	Return true when measurement completed within its numeric and work limits.
std::size_t	measurementWorkUnits () const
	Number of command visits and recursive subdivisions used to build this index.
std::optional< std::size_t >	retainedBytes () const
	Exact object and vector-capacity bytes retained by this index, or nullopt on overflow.

Friends
class	Path

Detailed Description

Precomputed arc-length index for repeated path sampling.

Construction is linear in the number of path commands. Sampling uses a binary search over drawable segments, so text-on-path does not rescan the complete source path once per glyph.

Member Enumeration Documentation

BoundarySide

enum class donner::Path::MeasuredPath::BoundarySide : uint8_t

strong

Side of a connected segment boundary used for its tangent and normal.

Enumerator
Incoming	Sample the segment ending at the boundary.
Outgoing	Sample the connected segment beginning at the boundary.

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The documentation for this class was generated from the following file:

• donner/base/Path.h