This node generates a mask in the shape of the arc of a circle.

The arc of a circle is defined by 3 points: point 1 and point 3
form the 2 extremities of the arc of a circle, and point 2 adjusts
the radius of curvature between the two end points.

Points 1, 2 and 3 can be moved using the manipulators or their X
and Y coordinates can be entered manually in the node
properties.

The points cannot overlap, i.e. it is impossible to create a closed
circle.

If the coordinate values of a point are constrained
by a value from an optional input connector, the manipulator
associated with these coordinates is not displayed. In the example
below, the coordinate values of point 1 come from another node: the
manipulator of point 1 no longer appears.

To add an Arc node, right-click in the Graph Editor and select
**Create Node > Mask Generation >
Arc** or press the keyboard shortcut **N-A-R**
(Node Arc).

Double click on the node to open its parameters:

To edit the Arc node:

**Preset**: List of existing size presets. Select one from the list to apply the size preset.**Width**: Width of the mask to generate in number of vertices.**Height**: Height of the mask to generate in number of vertices.**Quad size**: Size of the quads of the mask in meters.**Points 1 and**2: These points define the ends of the line. Use the sliders to adjust the point's X and Y coordinates.

The X and Y coordinates of each of the two points are relative to the center of the mask with a value between -1 and +1:- 0 corresponds to the middle in width (X), in height (Y); (0,0) positions the point in the center of the mask.
- -1 and 1 correspond to the minimum and maximum values of the coordinates (limit of the mask); (1,1), (-1,1), (1,-1), and (1,1) position the point in one of the four corners of the mask.

**Line – Width**: Adjusts the thickness of the line from 1 to 20.

The Line and Arc
nodes can be used in components to propagate the coordinates of
their respective points, allowing the formation of a circuit. An
end point of an Arc can be linked to an end point of Line to
guarantee a permanently valid link between the different masks.
This is used in the This is used in the Road sample, available in
the **Help > Samples** menu.

Components can be retrieved from this sample project in the
Models window > Mask generation > Circuit - Arc or Circuit -
Line, and then right-click and select **Export
component**.

Components can also be retrieved from our site at https://www.wysilab.com/Library/#/.

Parameter | Use |
---|---|

Preset | List of existing size presets. |

Width | Width of the mask to generate in number of vertices. |

Height | Height of the mask to generate in number of vertices. |

Quad size | Size of the quads of the mask in meters. |

Points 1 and 2 | Defines the extremities of the circular arc. |

Point 3 | Adjusts the radius of curvature of the arc of a circle. |

Line - Width | Adjusts the thickness of the line from 1 to 20. |

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