阅读说明：本技术 方向盘模拟按键操作的方法及车载显示终端、车辆和介质 (Method for simulating key operation of steering wheel, vehicle-mounted display terminal, vehicle and medium ) 是由 李开虎 程晓鹏 李锋 于 2019-11-18 设计创作，主要内容包括：本发明公开了一种方向盘模拟按键的方法以及车载显示终端、车辆和介质,所述方向盘模拟按键操作的实现方法,包括：检测到实车处于游戏模式；获取方向盘的当前转动角度值和上一次转动角度值；根据所述当前转动角度值和所述上一次转动角度值判断所述方向盘的转向趋势,并根据所述转向趋势切换所述方向盘转动状态；根据切换后的方向盘转动状态输出显示界面操作指令。该方法可以使方向盘对游戏的操控更为简单,提高游戏操作的流畅度。(The invention discloses a method for simulating keys on a steering wheel, a vehicle-mounted display terminal, a vehicle and a medium, wherein the method for realizing the operation of the simulated keys on the steering wheel comprises the following steps: detecting that the real vehicle is in a game mode; acquiring a current rotation angle value and a last rotation angle value of a steering wheel; judging the steering trend of the steering wheel according to the current rotation angle value and the last rotation angle value, and switching the rotation state of the steering wheel according to the steering trend; and outputting a display interface operation instruction according to the switched steering wheel rotation state. The method can make the control of the steering wheel to the game simpler and improve the fluency of the game operation.)

1. A method for realizing simulation key operation of a steering wheel is characterized by comprising the following steps:

detecting that the real vehicle is in a game mode;

acquiring a current rotation angle value and a last rotation angle value of a steering wheel;

judging the steering trend of the steering wheel according to the current rotation angle value and the last rotation angle value, and switching the rotation state of the steering wheel according to the steering trend;

and outputting a display interface operation instruction according to the switched steering wheel rotation state.

2. The method for implementing the simulated key operation of the steering wheel according to claim 1, wherein the step of determining the steering trend of the steering wheel according to the current rotation angle value and the last rotation angle value and switching the rotation state of the steering wheel according to the steering trend comprises the steps of:

determining the current state of the steering wheel according to the current rotation angle value;

calculating an angle difference value between the current rotation angle value and the last rotation angle value;

determining a target state according to the current state, the last rotation angle value and the angle difference value;

controlling the steering wheel to switch from the current state to the target state.

3. The method for implementing the simulated key operation of the steering wheel according to claim 2, wherein the determining the target state according to the current state, the last rotation angle value and the angle difference value comprises:

and if the steering wheel is in a return-to-positive state currently, the last rotation angle value is larger than zero, and the angle difference value is larger than zero, the target state is a left rotation state.

4. The method for implementing the simulated key operation of the steering wheel according to claim 2, wherein the determining the target state according to the current state, the last rotation angle value and the angle difference value comprises:

and if the steering wheel is in a return-to-positive state currently, the last rotation angle value is smaller than zero, and the angle difference value is smaller than zero, the target state is a right rotation state.

5. The method for implementing the simulated key operation of the steering wheel according to claim 2, wherein the determining the target state according to the current state, the last rotation angle value and the angle difference value comprises:

and if the steering wheel is in a left rotating state currently, the last rotating angle value is larger than zero, and the angle difference value is smaller than zero, the target state is in a return-to-positive state.

6. The method for implementing the simulated key operation of the steering wheel according to claim 2, wherein the determining the target state according to the current state, the last rotation angle value and the angle difference value comprises:

and if the steering wheel is in a right-hand rotation state currently, the last rotation angle value is smaller than zero, and the angle difference value is larger than zero, the target state is in a return-to-positive state.

7. A non-transitory computer storage medium having a computer program stored thereon, wherein the computer program is executed to implement the method for simulating the operation of the steering wheel keys according to any one of claims 1 to 6.

8. An in-vehicle display terminal, comprising:

the display screen provides a display interface;

at least one processor communicatively coupled to the memory;

the memory stores processing instructions, and the processor implements the method for implementing the simulated key operation of the steering wheel according to any one of claims 1 to 6 when executing the processing instructions.

9. A vehicle characterized by comprising a steering system and the in-vehicle display terminal of claim 8, wherein the steering system comprises a steering wheel and a rotation angle sensor.

10. The vehicle of claim 9, further comprising a gear shifter, the gear shifter being provided with a game gear.

Technical Field

The invention relates to the technical field of man-machine interaction games, in particular to a method for realizing steering wheel simulation key operation, a non-temporary computer storage medium, a vehicle-mounted display terminal and a vehicle.

Background

In the prior art, when a game is played through a steering wheel of a real vehicle, the state of pressing and lifting a key is mainly simulated by using the steering wheel, when the angle of left-right rotation of the steering wheel is greater than a certain threshold value, the operation of pressing left or right is triggered, and when the angle of the steering wheel is less than the certain threshold value, the operation of lifting left or right is triggered. The method is characterized in that the rotation angle of the steering wheel is used for simulating the pressing or lifting of a key, corresponding operation can be completed, but when the angle value is reduced and does not exceed the critical value of the pressed state, the pressed operation is still executed, the process is not consistent with logic, and hands are difficult to operate, so that the operation is not smooth, and the convenience of playing games by using the steering wheel cannot be embodied.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide a method for implementing a steering wheel simulation key operation, which can make the steering wheel easier to control a game and improve the smoothness of game operation when playing the game through the steering wheel.

It is a further object of the present invention to provide a non-transitory computer storage medium.

The second objective of the present invention is to provide a vehicle-mounted display terminal.

The second purpose of the invention is to provide a vehicle.

In order to solve the above problem, an implementation method for simulating a key operation on a steering wheel according to an embodiment of a first aspect of the present invention includes: detecting that the real vehicle is in a game mode; acquiring a current rotation angle value and a last rotation angle value of a steering wheel; judging the steering trend of the steering wheel according to the current rotation angle value and the last rotation angle value, and switching the rotation state of the steering wheel according to the steering trend; and outputting a display interface operation instruction according to the switched steering wheel rotation state.

According to the method for realizing the simulation key operation of the steering wheel, the current rotation angle value and the last rotation angle value of the steering wheel are obtained, the steering trend is determined according to the real-time change of the rotation angle of the steering wheel, and the steering wheel is switched to the corresponding steering wheel rotation state according to the steering trend, so that the game operation is realized.

In some embodiments, determining a steering trend of the steering wheel according to the current rotation angle value and the last rotation angle value, and switching the rotation state of the steering wheel according to the steering trend includes: determining the current state of the steering wheel according to the current rotation angle value; calculating an angle difference value between the current rotation angle value and the last rotation angle value; determining a target state according to the current state of the steering wheel, the last rotation angle value and the angle difference value; controlling the steering wheel to switch from the current state to the target state.

In some embodiments, said determining a target state from said current state, said last rotation angle value and said angle difference value comprises: and if the steering wheel is in a return-to-positive state currently, the last rotation angle value is larger than zero, and the angle difference value is larger than zero, the target state is a left rotation state.

In some embodiments, said determining a target state from said current state, said last rotation angle value and said angle difference value comprises: and if the steering wheel is in a return-to-positive state currently, the last rotation angle value is smaller than zero, and the angle difference value is smaller than zero, the target state is a right rotation state.

In some embodiments, said determining a target state from said current state, said last rotation angle value and said angle difference value comprises: and if the steering wheel is in a left rotating state currently, the last rotating angle value is larger than zero, and the angle difference value is smaller than zero, the target state is in a return-to-positive state.

In some embodiments, said determining a target state from said current state, said last rotation angle value and said angle difference value comprises: and if the steering wheel is in a right-hand rotation state currently, the last rotation angle value is smaller than zero, and the angle difference value is larger than zero, the target state is in a return-to-positive state.

A second aspect of the present invention provides a non-transitory computer storage medium, on which a computer program is stored, where the computer program is configured to implement the method for implementing steering wheel simulation key operation according to the foregoing embodiments when executed.

An embodiment of a third aspect of the present invention provides a vehicle-mounted display terminal, including: the display screen provides a display interface; at least one processor communicatively coupled to the memory; the memory stores a processing instruction, and the processor implements the method for implementing the steering wheel simulation key operation according to the above embodiment when executing the processing instruction.

According to the vehicle-mounted display terminal provided by the embodiment of the invention, by adopting the implementation method of the steering wheel simulation key operation, the response speed is higher and the control is smoother based on the steering wheel operation.

In a fourth aspect, the present invention provides a vehicle, including a steering system and the vehicle-mounted display terminal of the above embodiments, where the steering system includes a steering wheel and a steering angle sensor.

According to the vehicle provided by the embodiment of the invention, by adopting the vehicle-mounted display terminal of the embodiment, the control of the steering wheel on the game is simpler in the real vehicle game mode, the operation smoothness is improved, the response speed is high, the time delay is low, and the trigger action is more sensitive.

In some embodiments, the vehicle further comprises a gear shifter provided with a game gear.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a flow chart of a method for implementing a simulated key operation of a steering wheel according to an embodiment of the present invention;

FIG. 2 is a graph showing a trend of a change in a rotation angle value when the steering wheel is turned left and right according to an embodiment of the present invention;

FIG. 3 is a flowchart of a method for implementing a simulated key operation of a steering wheel according to another embodiment of the present invention;

FIG. 4 is a block diagram of a vehicle-mounted display terminal according to one embodiment of the present invention;

fig. 5 is a block diagram of a vehicle according to an embodiment of the invention.

Reference numerals:

a vehicle 10;

a vehicle-mounted display terminal 1; a memory 2; at least one processor 3; a display screen 4; a steering system 5; a steering wheel 6; and a rotation angle sensor 7.

Detailed Description

Embodiments of the present invention will be described in detail below, the embodiments described with reference to the drawings being illustrative, and the embodiments of the present invention will be described in detail below.

In the related art, the operation instruction can be switched only when the steering wheel turns left and right and the turning angle reaches a preset angle value, so that the game operation is not smooth enough by simulating keys on the steering wheel. And when the CAN bus of the vehicle reports data, the CAN bus has the characteristic of intermittent delay, if the steering wheel is rotated rapidly in the process of reporting the data, the reported data is suddenly small or even abnormal data is generated, so that the control algorithm cannot cover all situations, for example, when the state of rotating leftwards or rightwards is not switched to the return state, but the state of rotating leftwards or rightwards CAN only be switched in the return state, so that the program is abnormal, the direction is out of control, and the game operation is not smooth.

In order to solve the above problems, a method for implementing a steering wheel simulation button according to an embodiment of the present invention is described below with reference to the accompanying drawings, and when a game is played through a steering wheel, the method can make the steering wheel easier to control the game, and improve the smoothness of game operation.

Fig. 1 shows a flowchart of an implementation method for simulating key operation of a steering wheel according to an embodiment of the present invention. As shown in FIG. 1, the method for implementing the simulated key operation of the steering wheel in the embodiment of the invention includes steps S1-S4.

In step S1, it is detected that the real vehicle is in the game mode.

Specifically, a game gear can be set on a gear shifter of the vehicle, a user switches the gear to the game gear by operating the gear shifter, and the controller detects a game gear switching instruction, and switches the entire vehicle to a game mode, for example, the clutch device of the steering mechanism is controlled to disconnect the steering wheel from the connecting mechanism thereof mechanically, the vehicle-mounted display device provides a display interface, the game is started according to the input instruction, and the simulation key operation of the steering wheel is responded, so that the display interface instruction input, the game function operation and the like are realized.

And step S2, acquiring the current rotation angle value and the last rotation angle value of the steering wheel.

In a game mode, according to the rotation of the steering wheel, the vehicle-mounted end acquires the rotation angle value of the steering wheel in real time, reports the rotation angle data through the CAN bus and stores the rotation angle data, so that the current rotation angle value and the last rotation angle value of the steering wheel CAN be acquired when a game is played, and the rotation trend of the steering wheel CAN be determined. Among them, a CAN bus (Controller Area Network) is mainly applied to data communication between electric appliances in a strong disturbing environment inside a vehicle.

And step S3, judging the steering trend of the steering wheel according to the current rotation angle value and the last rotation angle value, and switching the rotation state of the steering wheel according to the steering trend.

During the game operation, the pressing or lifting action of the key is simulated according to the turning angle trend of the steering wheel during rotation, the current rotation angle value is compared with the last rotation angle value, the steering trend of the steering wheel is determined according to the angle difference, and the current rotation state of the steering wheel is switched to the corresponding rotation state by the vehicle-mounted end according to the steering trend of the steering wheel.

Specifically, the current state of the steering wheel is determined according to the current rotation angle value; calculating an angle difference value between the current rotation angle value and the last rotation angle value, and determining the steering trend of the steering wheel; determining a target state according to the current state of the steering wheel, the last rotation angle value and the angle difference value; and switching the current state of the steering wheel to a target state according to the steering trend.

Wherein, three variable marks can be defined as three rotation states of the steering wheel, which are respectively: a right-turn state, a left-turn state and a return-to-center state, while defining rules for switching between different turn states depending on the turn state of the steering wheel, specifically a return-to-center state when the steering wheel is not turned in the initial position, a right-turn state when the steering wheel is turned to the right from the return-to-center state, and a left-turn state when the steering wheel is turned to the left from the return-to-center state. In addition, the conversion of the three turning states is changed by the turning tendency of the steering wheel, and when the steering wheel is turned to the right from the initial neutral position, the conversion is made to the right turning state; when the steering wheel rotates to the left from the initial middle position, the steering wheel is converted into a left-turning state; when the steering wheel is turned from the neutral position to the neutral position, the state is switched to the return state.

And step S4, outputting a display interface operation instruction according to the switched steering wheel rotation state.

In the game operation process, when the current rotation state of the steering wheel is switched, the operation instruction of the current rotation state of the steering wheel in the switching process is not needed to be considered, and the operation instruction of the target state is output on the display interface according to the rotation state of the steering wheel after switching, namely the target state. That is, when the rotation state of the current steering wheel identifier is in different operation states, the corresponding operation instruction is triggered, and the character in the game is controlled to perform game operation, but after the rotation state is switched to the target state, the operation instruction in the target state is output, so that the result of executing the operation instruction is displayed on the game display interface, and the purpose of reasonably controlling the game operation is achieved.

According to the method for realizing the simulation key operation of the steering wheel, the reasonable control of the game is realized by switching different rotating states by utilizing the trend of the rotating angle when the steering wheel rotates, namely the current rotating angle value and the last rotating angle value of the steering wheel are obtained, the change of the rotating angle of the steering wheel is determined by comparison, namely the steering trend of the steering wheel is judged, the rotating state of the steering wheel is switched according to the steering trend, and the game is realized, compared with the operation by utilizing the rotating angle of the steering wheel, the method of the embodiment of the invention can avoid the situation that the operation is out of control when the rotating angle value is reduced or increased but not exceeds the critical value of the pressed or lifted state without considering the operation instruction in the switching process when the steering wheel is utilized to play the game, the steering wheel is simpler and more convenient to control the game, the response speed is high, the triggering action is more sensitive, and the smoothness of game operation is improved.

Further, in the embodiment, a temporary variable may be defined for storing the previous turning angle value, so as to determine whether the steering wheel turning angle is an increasing trend or a decreasing trend by comparing the magnitude between the current turning angle value and the previous turning angle value, and then define the determination condition of the specific turning state transition. Specifically, the determination is made based on the current rotation angle value, the last rotation angle value, and the angle difference value, if the steering wheel is currently in the return-to-positive state, and the last rotation angle value is greater than zero, and the angle difference value is greater than zero, the target state is the left-rotation state, and if the steering wheel is currently in the return-to-positive state, and the last rotation angle value is less than zero, and the angle difference value is less than zero, the target state is the right-rotation state, and if the steering wheel is currently in the left-rotation state, and the last rotation angle value is greater than zero, and the angle difference value is less than zero, the target state is the return-to-positive state, and if the steering wheel is currently in the right-rotation state, and the last rotation angle value is less than zero, and the angle difference value is greater than zero, the target state.

For example, as shown in fig. 2, it is a graph showing the trend of the change of the rotation angle value when the steering wheel is turned left and right, wherein the x-axis represents time and the unit is 0.1 second; the y-axis represents angle in degrees, positive values of angle indicating left-hand steering and negative values of angle indicating right-hand steering. As CAN be seen from fig. 2, the change trend of the angle data reported by the steering wheel through the CAN bus is similar to the trend of a sine function, so that the conversion rule CAN be defined as the following form, and when the angle value is gradually decreased (decreased) from zero, the steering wheel is switched to a right-hand rotation state; when the angle value is gradually increased from zero (gradually increased), the angle value is switched to a left rotating state; when the angle value becomes small from a value larger than zero degrees or becomes large from a value smaller than zero degrees, the state is switched to the return-to-positive state. In fig. 2, the zero point position is taken as the initial center-aligned position of the steering wheel, that is, the steering wheel is in the alignment state when the steering wheel is not rotated at the initial position.

The following describes, in detail, an implementation method of the simulated key operation of the steering wheel according to the embodiment of the present invention with reference to fig. 3, as shown in fig. 3, the specific steps are as follows.

In step S5, a steering wheel turning state variable is defined, and S6 is executed.

And step S6, defining and recording the current steering wheel rotation angle value variable and the last rotation angle value variable, and executing step S7.

In step S7, the current rotation state of the steering wheel is determined. If the left rotation state is the left rotation state, executing S8; if the return state is positive, go to S9; if the right-turn state is detected, S10 is executed.

In step S8, after the left rotation state is determined, the previous rotation angle value and 0 are determined. If greater than 0, go to S11.

In step S9, after the return-to-positive state is determined, the previous rotation angle value and 0 are determined. If greater than 0, go to S12, and if less than 0, go to S13.

In step S10, after the right rotation state is determined, the previous rotation angle value is determined to be 0. If less than 0, go to S14.

Step S11, determine the difference between the current angle value and the last rotation angle value and the value of 0. If less than 0, go to S15.

Step S12, determine the difference between the current angle value and the last rotation angle value and the value of 0. If greater than 0, go to S16.

Step S13, determine the difference between the current angle value and the last rotation angle value and the value of 0. If less than 0, go to S17.

Step S14, determine the difference between the current angle value and the last rotation angle value and the value of 0. If greater than 0, go to S18.

In step S15, the current state is switched to the return-to-positive state.

In step S16, the current state is switched to the left-hand rotation state.

In step S17, the current state is switched to the rightward rotation state.

In step S18, the current state is switched to the return-to-positive state.

In summary, according to the method for implementing the simulated key operation of the steering wheel of the embodiment of the present invention, the pressing or lifting action of the key is simulated by using the trend of the rotation angle when the steering wheel rotates, specifically, the rotation trend is reasonably controlled according to the actual situation, and the switching between different rotation states is performed according to the rotation trend of the steering wheel, so that the fluency of the game operation is greatly improved, and the method of the embodiment of the present invention perfectly decouples the switching between the operation instruction executed in the game and the rotation state of the steering wheel, that is, when the rotation state is switched, the operation instruction in the switching process is not considered, and only when the operation instruction in the target state is switched to different target states, the operation instruction in the target state is executed, so that the response speed is fast, the delay is low, and the triggering action is more sensitive.

In a second aspect, the embodiment of the present invention provides a non-transitory computer readable storage medium, on which a computer program is stored, and when the computer program is executed, the implementation method for simulating a key operation on a steering wheel of the above embodiment is implemented.

In a third embodiment of the present invention, an in-vehicle display terminal is provided, as shown in fig. 4, the in-vehicle display terminal 1 includes a display screen 2, a memory 3, and at least one processor 4 communicatively connected to the memory 3.

The display screen 2 provides a display interface, the memory 3 stores a processing instruction, and the processor 4 implements the method for implementing the simulated key operation of the steering wheel provided by the above embodiment when executing the processing instruction.

According to the vehicle-mounted display terminal 1 provided by the embodiment of the invention, the processor 4 is used for executing the method for realizing the steering wheel simulation key, so that when the vehicle is in a game mode and the rotating state is switched, the game can be operated and controlled more smoothly, the response speed is high, and the game experience is improved.

A fourth aspect embodiment of the present invention proposes a vehicle, and as shown in fig. 5, a vehicle 10 includes a steering system 5 and the on-vehicle display terminal 1 of the above-described embodiment, wherein the steering system 5 includes a steering wheel 6 and a rotation angle sensor 7.

Wherein the steering wheel 6 is used to simulate a pressed or lifted operation state in the game mode. The rotation angle sensor 7 is used for detecting the rotation angle of the steering wheel 6 and transmitting the rotation angle to the vehicle-mounted end.

In some embodiments, the vehicle 10 further includes a gear shifter, the gear shifter is provided with a game gear, and when the game mode is switched, a user can operate the gear shifter to switch to the game gear, so that the vehicle can be controlled to enter the game mode, and then the vehicle 10 can perform the simulated key operation of the above embodiments through a steering wheel, so as to realize the input of the instruction in the interface of the vehicle-mounted display terminal 1.

According to the vehicle 10 provided by the embodiment of the invention, the vehicle-mounted display terminal 1 adopts the implementation method of the steering wheel simulation key of the embodiment, namely, the steering wheel rotation trend is utilized to switch between different rotation states, so that when the vehicle is in a game mode, the control of a game is simpler and smoother, the response speed is high, the time delay is low, the trigger action is more sensitive, and the game experience is improved.

In the description of this specification, any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of custom logic functions or processes, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present invention.

The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.

It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.

It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.

In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.

The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.