Function rotateByVertex

Rotates the vertices of the triangle around one point (by default, b), returning as a new object.

let triangle = Triangles.fromPoints([a, b, c]);
triangle = Triangles.rotateByVertex(triangle, Math.Pi, `a`);

rotateByVertex(triangle, amountRadian, vertex?): Triangle
Parameters
- triangle: Triangle
  Triangle
- amountRadian: number
  Angle to rotate by
- vertex: "a" | "b" | "c" = ...
  Name of vertex: a, b or c.
Returns Triangle
A new triangle