OpenPath class final

A path through points, measured by distance along it: where it is at s metres, which way it runs there, and which way is right.

A road is not a list of points. A racing game asks "where is the car eighty metres on" and "which way is the road pointing there", and a list of points answers neither without the arithmetic every such game wrote for itself: which segment, how far into it, and a heading that does not snap at every corner. Distances are cumulative lengths of the straight pieces between points; smooth the points first (a CatmullRom sampled finely) for a smooth road.

Right is the tangent crossed with up, so a path over flat ground has its right on the ground. Beyond either end the path goes straight on.

Constructors

OpenPath(List<Vector3> points, {Vector3? up})

Properties

hashCode → int

The hash code for this object.

no setter, inherited

length → double

How long the path is, in metres.

no setter

points → List<Vector3>

final

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

up → Vector3

What right is taken against.

final

Methods

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

pointAt(double s, [Vector3? out]) → Vector3

Where the path is s metres along it, into out if given.

rightAt(double s, [Vector3? out]) → Vector3

Which way is right of the path at s, a unit vector on the plane square to up, into out if given.

tangentAt(double s, [Vector3? out]) → Vector3

Which way the path runs at s, a unit vector, into out if given.

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited