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---
- GuiCommand:
   Name: Draft Arc 3Points
   MenuLocation: Drafting -> Arc tools -> Arc by 3 points
   Workbenches: Draft_Workbench, Arch_Workbench
   Shortcut: **A** **T**
   Version: 0.19
   SeeAlso: Draft_Arc, Draft_Circle
---

Draft Arc 3Points

Description

The Draft Arc 3Points command creates a circular arc in the current working plane from three points that define its circumference. The center and radius are calculated from these points.

A Draft Arc is in fact a Draft Circle with a First Angle that is not the same as its Last Angle.

*Arc defined by three points on its circumference*

Usage

See also: Draft Tray, Draft Snap and Draft Constrain.

  1. There are several ways to invoke the command:
    • Press the Draft Arc 3Points button.
    • Select the Drafting → Arc tools → Arc by 3 points option from the menu.
    • Use the keyboard shortcut: A then T. (v0.20)
  2. The Arc by 3 points task panel opens. See Options for more information.
  3. Pick the first point in the 3D view, or type coordinates and press the Enter point button.
  4. Pick the second point in the 3D view, or type coordinates and press the Enter point button.
  5. Pick the third point in the 3D view, or type coordinates and press the Enter point button.

Options

The single character keyboard shortcuts available in the task panel can be changed. See Draft Preferences. The shortcuts mentioned here are the default shortcuts.

  • To manually enter coordinates enter the X, Y and Z component, and press Enter after each. Or you can press the Enter point button when you have the desired values. It is advisable to move the pointer out of the 3D view before entering coordinates.
  • Press R or click the Relative checkbox to toggle relative mode. If relative mode is on, coordinates are relative to the last point, if available, else they are relative to the coordinate system origin.
  • Press G or click the Global checkbox to toggle global mode. If global mode is on, coordinates are relative to the global coordinate system, else they are relative to the working plane coordinate system. (v0.20)
  • Press T or click the Continue checkbox to toggle continue mode. If continue mode is on, the command will restart after finishing, allowing you to continue creating arcs. (v0.20)
  • Press S to switch Draft snapping on or off.
  • Press Esc or the Close button to abort the command.

Notes

  • A Draft Arc can be edited with the Draft Edit command.

Preferences

See also: Preferences Editor and Draft Preferences.

  • To change the number of decimals used for the input of coordinates: Edit → Preferences... → General → Units → Units settings → Number of decimals.
  • If the Edit → Preferences... → Draft → General settings → Draft tools options → Use Part Primitives when available option is checked, the command will create a non-editable Part Feature instead of a Draft Circle.

Properties

See Draft Circle.

Scripting

See also: Autogenerated API documentation and FreeCAD Scripting Basics.

To create a Draft Arc by 3 points use the make_arc_3points method of the Draft module:

arc = make_arc_3points(points, placement=None, face=False, support=None, map_mode="Deactivated", primitive=False)
  • Creates an arc object from the given points list.
  • If a placement is given, the center of the circular arc will be moved to this place. See Placement for more information.
  • If face is True, the arc will make a face, that is, it will appear filled.
  • If support is given, it is a LinkSubList, that is, a list indicating an object and a subelement of that object. This is used so that the object appears referenced to this support.

: For example: support=[(obj, ("Face1"))].

  • If map_mode is given, it is a string defining a type of mapping, for example: map_mode='FlatFace', map_mode='ThreePointsPlane', etc. See Part EditAttachment for more information.
  • If primitive is True, the arc created will be a simple Part Feature, not a complex Draft object.

Example:

import FreeCAD as App
import Draft

doc = App.newDocument()

points = [App.Vector(0, 0, 0),
          App.Vector(5, 10, 0),
          App.Vector(10, 0, 0)]

arc = Draft.make_arc_3points(points)

doc.recompute()

⏵ documentation index > Draft > Draft Arc 3Points