float point_distance(float x1, float y1, float x2, float y2)
{
  float dx = x2 - x1;
  float dy = y2 - y1;
  float inner = sq(dx) + sq(dy);
  float result = sqrt(inner);
  return result;
}
float[] move_in_direction(float startx, float starty, float direction, float distance)
{
	float newx = startx + cos(radians(direction)) * distance;
	float newy = starty - sin(radians(direction)) * distance;
	float[] result = {newx, newy};
	return result;
}
float point_direction(float x1, float y1, float x2, float y2)
{
  float dx = x2 - x1;
  float dy = y2 - y1;
  float direction = degrees(atan2(-dy, dx));
  return direction;
}