Function orient2d

orient2d(
    ax: number,
    ay: number,
    bx: number,
    by: number,
    cx: number,
    cy: number,
): number
Check the orientation of c relative to the line through a and b
Parameters
- ax: number
  x coordinate of first point
- ay: number
  y coordinate of first point
- bx: number
  x coordinate of second point
- by: number
  y coordinate of second point
- cx: number
  x coordinate of comparison point
- cy: number
  y coordinate of comparison point
Returns number
- a positive value if the points a, b, and c occur in counterclockwise order (c lies to the left of the directed line defined by points a and b).
- Returns a negative value if they occur in clockwise order (c lies to the right of the directed line ab).
- Returns zero if they are collinear.