Draw an arc on the screen.

An arc is a segment that traces part of the outline of a circle. If you are looking for something shaped like a piece of pie, then you want a segment.

Arcs are often drawn on top of a segment to get an affect where a piece of pie is filled in, but only the curvy edge is stroked.

Note that you can fill an arc, but that will result in a shape that looks like a potato wedge.

data

Data

{radius, angle}

The data for an arc is a tuple.

• radius - the radius of the arc
• angle - the angle the arc is swept through in radians

note

Note

The format for Arc has changed since v0.10. It used to be {radius, start_angle, end_angle}. You can achieve the same effect in the new, simpler format by using the same radius and the new angle is the difference between the old end_angle and start_angle. Then you can apply a rotation transform to get it in the right position.

styles

Styles

This primitive recognizes the following styles

• hidden - show or hide the primitive
• scissor - "scissor rectangle" that drawing will be clipped to.
• fill - fill in the area of the primitive
• cap - says how to draw the ends of the arc.
• stroke - stroke the outline of the primitive. In this case, only the curvy part.

usage

Usage

You should add/modify primitives via the helper functions in Scenic.Primitives

graph
  |> arc( {100, 1.5}, stroke: {1, :yellow} )