# Rysunek Roboczy: Łuk przez trzy punkty

This page is a translated version of the page Draft Arc 3Points and the translation is 4% complete.
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Draft Arc 3Points

Drafting → Arc tools → Arc by 3 points
Workbenches
Draft, Arch
Default shortcut
A T
Introduced in version
0.19
Draft Arc, Draft Circle

## 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 DANEFirst Angle that is not the same as its DANELast Angle.

Arc defined by three points on its circumference

## Usage

1. There are several ways to invoke the command:
• Press the button.
• Select the Drafting → Arc tools → Arc by 3 points option from the menu.
• Use the keyboard shortcut: A then T. introduced in version 0.20
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. introduced in version 0.20
• 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

• 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

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()
```

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Next: Circle