# Sketcher ToggleActiveConstraint

Sketcher ToggleActiveConstraint |

Menu location |
---|

Sketch → Sketcher constraints → Activate/deactivate constraint |

Workbenches |

Sketcher |

Default shortcut |

K Z |

Introduced in version |

0.19 |

See also |

Sketcher Toggle driving constraints |

## Description

ToggleActiveConstraint allows you to activate and deactivate an already placed constraint. This allows you to keep the constraint in the background but temporarily test another arrangement of the existing geometry.

The Toggle driving constraint tool is similar in that it disables the effect of the constraint; however, with this tool, the constraint does not keep its old value. On the other hand, with ToggleActiveConstraint you can re-activate the old constraint immediately.

## Usage

- Select an already placed constraint, then press ToggleActiveConstraint.
- Alternatively, got to the task panel, to the
**Constraints**section, select the constraint, then open the context menu (right-click), and select**Deactivate**. - To activate the constraint again, select it, and press ToggleActiveConstraint again.

## Examples

Fully constrained sketch.

Left: deactivated constraint; the sketch is no longer fully constrained. Right: the unconstrained geometry can be moved around; the older constraint is still available, and can be re-activated to return to the fully constrained sketch.

Task panel with the deactivated constraint.

## Scripting

*See also:* FreeCAD Scripting Basics.

The active status of a constraint can be controlled in macros and from the Python console.

```
SketchObject.toggleActive(index)
```

Use the `toggleActive`

method of an existing Sketcher SketchObject, and the `index`

of the constraint to activate it or deactivate it. The index starts from `0`

all the way to `N-1`

, where `N`

is the total number of constraints.

Example:

```
import FreeCAD as App
sketch = App.ActiveDocument.Sketch
sketch.toggleActive(3)
```

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**Sketcher constraints:****Geometric constraints:**Coincident, Point on object, Vertical, Horizontal, Parallel, Perpendicular, Tangent, Equal, Symmetric, Block**Dimensional constraints:**Lock, Horizontal distance, Vertical distance, Distance, Radius, Diameter, Auto radius/diameter, Angle, Snell's law**Constraint tools:**Toggle driving/reference constraint, Activate/deactivate constraint

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