Home > Primitives > Arc

< Previous: Circle: 3 Points | Next: Ellipse >

A circular arc from a center, a start point, and an end point.

Category: Primitives | Add menu: Primitives > Arc

The arc is the piece of a circle centered at Center that runs from the Start point round to the End point. The radius is the center-to-start distance; the end point sets where the arc stops. It pairs the three point lists index-for-index, one arc per triple. Unlike the closed circle nodes, its output is an open curve.

• Center (point): the center of the underlying circle.
• Start (point): where the arc begins; its distance from the center is the radius.
• End (point): the direction the arc sweeps toward, where it ends.
• Major (on/off): sweeps the long way round, over 180 degrees, instead of the short way.

• Arc (curve): one open arc per triple of points.

A piece of a circle, for when a full circle is too much: a curved side on a tile, a rounded corner, a petal edge.

The three points are a center and two ends, so the arc is built the way a compass would draw it. Major flips it to the long way round, which is how you get the reflex side without moving any points.

< Previous: Circle: 3 Points | Next: Ellipse >

• In the modeling view: Arc: Center, Start, End - draw the same arc directly on the canvas.