arc()

arc(arguments…)

Generates an arc for the given arguments. The arguments are arbitrary; they are simply propagated to the arc generator’s accessor functions along with the this object. For example, with the default settings, an object with radii and angles is expected:

var arc = d3.arc();

arc({
  innerRadius: 0,
  outerRadius: 100,
  startAngle: 0,
  endAngle: Math.PI / 2
}); // "M0,-100A100,100,0,0,1,100,0L0,0Z"

If the radii and angles are instead defined as constants, you can generate an arc without any arguments:

var arc = d3.arc()
    .innerRadius(0)
    .outerRadius(100)
    .startAngle(0)
    .endAngle(Math.PI / 2);

arc(); // "M0,-100A100,100,0,0,1,100,0L0,0Z"

If the arc generator has a context, then the arc is rendered to this context as a sequence of path method calls and this function returns void. Otherwise, a path data string is returned.