thinkyhead

G5 - Bézier cubic spline

1.1.0 motion Cubic B-spline with XYE destination and IJPQ offsets

Description

G5 creates a cubic B-spline in the XY plane with the X and Y axes only. P and Q parameters are required. I and J are required for the first G5 command in a series. For subsequent G5 commands, either both I and J must be specified, or neither. If I and J are unspecified, the starting direction of the cubic will automatically match the ending direction of the previous cubic (as if I and J are the negation of the previous P and Q).

See This interactive demo to understand how Bézier control points work.

Notes

It is an error if an axis other than X or Y is specified.

The first control point is the current position of the head. XY is the destination (the last control point of the spline).

The next control-points are the current position plus IJ and the current position plus PQ.

I and J can be omitted, which results in these offsets being zero. This produces a 3-point spline (try the interactive demo). However, P and Q are required (otherwise you just get a linear movement).

Usage

G5 [E<pos>] [F<rate>] I<pos> J<pos> P<pos> Q<pos> [S<power>] X<pos> Y<pos>

Parameters

[E<pos>]

The length of filament to feed into the extruder between the start and end point
[F<rate>]

The maximum feedrate of the move between the start and end point (in current units per second). This value applies to all subsequent moves.
I<pos>

Offset from the X start point to first control point
J<pos>

Offset from the Y start point to first control point
P<pos>

Offset from the X end point to second control point
Q<pos>

Offset from the Y end point to the second control point
[S<power>] 2.0.8

Set the Laser power for the move.
X<pos>

A destination coordinate on the X axis
Y<pos>

A destination coordinate on the Y axis

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