angleBetween function

double angleBetween(
  1. double x1,
  2. double y1,
  3. double x2,
  4. double y2,
)

Returns the angle in radians between two positions

Implementation

double angleBetween(double x1, double y1, double x2, double y2) =>
    rad(x2 - x1, y2 - y1);