Точка со смещением, конус и т.п.

x + distance * Cos(angle * bj_DEGTORAD)
y + disatnce * Sin(angle * bj_DEGTORAD)

function AngleBetweenXY_DEG( A_x,  A_y,  B_x,  B_y)
        return Atan2(B_y - A_y, B_x - A_x) * bj_RADTODEG
    end
^^^ можно просто сделать функцию с радианами

function IsPointInAngleWindow(facing, window, start_x, start_y, point_x, point_y)
		local angle  = AngleBetweenXY_DEG(start_x, start_y, point_x, point_y)
		local float_angle

		if angle < 0. then angle = angle + 360. end


		if facing < angle then
			float_angle = angle - facing
			if float_angle > 180. then float_angle = (facing - angle + 360.) end
		else
			float_angle = facing - angle
			if float_angle > 180. then float_angle = (angle - facing + 360.) end
		end

		return float_angle <= window
	end