arc-to

Implements CanvasContext2D arc() function with bare 2D points, attempting to maintain visual consistency.

var arc = require('arc-to')

var radius = 5
var points = arc(50, 50, radius, 0, Math.PI*2)

Now points will look like this:

[ [ 55, 50 ],
  [ 54.75528258147577, 51.545084971874736 ],
  
  ... etc ...

  [ 54.75528258147577, 48.454915028125264 ],
  [ 55, 50 ] ]
]

Usage

arcTo(x, y, radius, start, end[, clockwise, steps, path])

Using [x, y] as the origin (center) and a circle radius, this draws an arc (i.e. part of a circle) from start to end angle (in radians) with the given steps.

x, y, radius, start and end all default to zero if unspecified.

clockwise defaults to false.

If steps is not given, it will estimate it based on the cube root of the radius.

You can also specify a path argument if you want the 2D points to be added to an existing array, rather than creating a new array.

License

MIT, see LICENSE.md for details.