private static double GetAngle(IUtils utils, Point firstPoint, Point secondPoint)
{
var angle = utils.GetAngle(firstPoint, secondPoint);
// convert to proper Cartesian angle of rotation
angle = (450 - angle) % 360;
// convert to Radians
angle = angle * Math.PI / 180.0;
// Get perpendicular angle:
angle += 90 * Math.PI / 180.0;
if (angle > 2 * Math.PI)
{
angle -= 2 * Math.PI;
}
return(angle);
}
