---
tag: g005
title: Bézier Cubic Spline Move
brief: Cubic Bézier spline with XYE destination and IJPQ offsets
author: thinkyhead

group: motion
since: 1.1.0

codes: [ G5 ]

videos:
- aVwxzDHniEw

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](//www.geogebra.org/m/WPHQ9rUt)). However, `P` and `Q` are required (otherwise you just get a linear movement)."

parameters:

- tag: X
  optional: false
  description: A destination coordinate on the X axis
  values:
  - tag: pos
    type: float

- tag: Y
  optional: false
  description: A destination coordinate on the Y axis
  values:
  - tag: pos
    type: float

- tag: E
  optional: true
  description: The length of filament to feed into the extruder between the start and end point
  values:
  - tag: pos
    type: float

- tag: F
  optional: true
  description: The maximum feedrate of the move between the start and end point (in current units per second). This value applies to all subsequent moves.
  values:
  - tag: rate
    type: float

- tag: I
  optional: false
  description: Offset from the `X` start point to first control point
  values:
  - tag: pos
    type: float

- tag: J
  optional: false
  description: Offset from the `Y` start point to first control point
  values:
  - tag: pos
    type: float

- tag: P
  optional: false
  description: Offset from the `X` end point to second control point
  values:
  - tag: pos
    type: float

- tag: Q
  optional: false
  description: Offset from the `Y` end point to the second control point
  values:
  - tag: pos
    type: float

- tag: S
  optional: true
  since: 2.0.8
  description: Set the Laser power for the move.
  values:
  - tag: power
    type: float

examples:
- pre: 'For example, to program a curvy "N" shape:'
  code:
    - G0 X0 Y0
    - G5 I0 J3 P0 Q-3 X1 Y1

- pre: 'A second curvy "N" that attaches smoothly to this one can now be made without specifying `I` and `J`:'
  code: G5 P0 Q-3 X2 Y2

---

`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](//www.geogebra.org/m/WPHQ9rUt) to understand how Bézier control points work.
