PathFollow2D

Inherits: Node2D < CanvasItem < Node < Object

Point sampler for a Path2D.

Description

This node takes its parent Path2D, and returns the coordinates of a point within it, given a distance from the first vertex.

It is useful for making other nodes follow a path, without coding the movement pattern. For that, the nodes must be children of this node. The descendant nodes will then move accordingly when setting an offset in this node.

Property Descriptions

Default

true

Setter

set_cubic_interpolation(value)

Getter

get_cubic_interpolation()

If true, the position between two cached points is interpolated cubically, and linearly otherwise.

The points along the Curve2D of the Path2D are precomputed before use, for faster calculations. The point at the requested offset is then calculated interpolating between two adjacent cached points. This may present a problem if the curve makes sharp turns, as the cached points may not follow the curve closely enough.

There are two answers to this problem: either increase the number of cached points and increase memory consumption, or make a cubic interpolation between two points at the cost of (slightly) slower calculations.


Default

0.0

Setter

set_h_offset(value)

Getter

get_h_offset()

The node's offset along the curve.


Default

4.0

Setter

set_lookahead(value)

Getter

get_lookahead()

How far to look ahead of the curve to calculate the tangent if the node is rotating. E.g. shorter lookaheads will lead to faster rotations.


Default

true

Setter

set_loop(value)

Getter

has_loop()

If true, any offset outside the path's length will wrap around, instead of stopping at the ends. Use it for cyclic paths.


Default

0.0

Setter

set_offset(value)

Getter

get_offset()

The distance along the path in pixels.


Default

true

Setter

set_rotates(value)

Getter

is_rotating()

If true, this node rotates to follow the path, with the +X direction facing forward on the path.


Default

0.0

Setter

set_unit_offset(value)

Getter

get_unit_offset()

The distance along the path as a number in the range 0.0 (for the first vertex) to 1.0 (for the last). This is just another way of expressing the offset within the path, as the offset supplied is multiplied internally by the path's length.


Default

0.0

Setter

set_v_offset(value)

Getter

get_v_offset()

The node's offset perpendicular to the curve.