CN112857371A - Navigation two-dimensional code generation method, park navigation method and park navigation device - Google Patents
Navigation two-dimensional code generation method, park navigation method and park navigation device Download PDFInfo
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- G06K7/14—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation using light without selection of wavelength, e.g. sensing reflected white light
- G06K7/1404—Methods for optical code recognition
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Abstract
The invention discloses a navigation two-dimensional code generation method, a park navigation method and a park navigation device, wherein the navigation two-dimensional code generation method comprises the following steps: acquiring an integral plan of a park to be navigated; carrying out electronic coding on the whole plane graph to obtain a three-dimensional coordinate of the park to be navigated; and generating a road sign two-dimensional code according to the three-dimensional coordinate, the position of the park to be navigated and the mark position in the park to be navigated. By implementing the method, the device and the system, the park plan is adopted, the plan is converted into the three-dimensional coordinate, and the three-dimensional coordinate of the mark position in the park plan is extracted to generate the road sign two-dimensional code. Therefore, the navigation in the garden can be realized by the user through the landmark two-dimensional code containing the specific position, and the technical problem that the navigation cost in the garden is higher in the existing RFID network is solved. In addition, the generated road sign two-dimensional code can be used for positioning to a park by adopting a map system, navigation in the park can be realized, and the use experience of a user is improved.
Description
Technical Field
The invention relates to the technical field of navigation, in particular to a navigation two-dimensional code generation method, a park navigation method and a park navigation device.
Background
With the rapid development of modern cities, supermarkets, malls, shopping centers and various commercial centers are enlarged, and customers often need to spend a great deal of time searching for desired target areas during shopping. At present, generally, a direction board or a market map is arranged in an indoor place for navigation, but the destination is difficult to find quickly by the direction board or the market map which is only arranged by a customer.
At present, the widely used outdoor navigation GPS technology cannot be effectively used in indoor occasions; the technical scheme of realizing positioning through Wi-Fi signals is also provided, but the accuracy of Wi-Fi positioning needs to be improved; and the sampling RFID technology needs to arrange a huge RFID network, so that the cost is higher.
Disclosure of Invention
In view of this, embodiments of the present invention provide a navigation two-dimensional code generation method, a campus navigation method, and a campus navigation device, so as to solve the technical problem in the prior art that positioning and navigation using an RFID network are high in cost.
The technical scheme provided by the invention is as follows:
a first aspect of the embodiments of the present invention provides a navigation two-dimensional code generation method, including: acquiring an integral plan of a park to be navigated; carrying out electronic coding on the whole plane graph to obtain a three-dimensional coordinate of the park to be navigated; and generating a road sign two-dimensional code according to the three-dimensional coordinate, the position of the park to be navigated and the sign position in the park to be navigated.
Optionally, the electronically encoding the overall plan to obtain the three-dimensional coordinates of the park to be navigated includes: selecting a preset position in a park to be navigated as an origin of a coordinate system; and obtaining the three-dimensional coordinates of the park to be navigated according to the corresponding position information in the overall plan and the origin.
Optionally, generating a landmark two-dimensional code according to the three-dimensional coordinate, the position of the park to be navigated, and the landmark position in the park to be navigated, includes: obtaining first information according to the position of the park to be navigated; obtaining second information according to the three-dimensional coordinates and the mark position in the park to be navigated; and generating a road sign two-dimensional code according to the first information and the second information.
Optionally, the method for generating a navigation two-dimensional code further includes: and placing the generated two-dimensional code of the road sign in a corresponding sign position in the park and storing the two-dimensional code of the road sign and the corresponding sign position in the mobile terminal, wherein the sign position comprises the corresponding positions of a crossing, an elevator entrance, a landmark store, a landmark building, a parking lot and a shop overview map in the park to be navigated.
A second aspect of the embodiments of the present invention provides a park navigation method, including: acquiring a landmark two-dimensional code generated by the navigation two-dimensional code generation method according to any one of the first aspect and the first aspect of the embodiment of the invention according to a target position; scanning the two-dimensional code to obtain first information and second information of the two-dimensional code; obtaining a first navigation path from the current position to the gate of the park by combining the first information with a map system; and calculating a second navigation path from the park doorway to the target position according to the second information.
Optionally, the park navigation method further includes: acquiring and storing a two-dimensional code of a road sign at a parking position; and when the vehicle is searched, calculating to obtain a vehicle searching navigation path according to the two-dimensional code of the road sign at the current position and the two-dimensional code of the road sign at the parking position.
Optionally, the park navigation method further includes: acquiring and storing a two-dimensional code of a road sign at a target position in a shop overview map; and calculating to obtain a shop navigation path according to the two-dimensional code of the road sign at the current position and the two-dimensional code of the road sign at the target position in the shop overview map.
A third aspect of an embodiment of the present invention provides a park navigation apparatus, including: a current obtaining module, configured to obtain, according to a target location, a landmark two-dimensional code generated by the navigation two-dimensional code generation method according to any one of the first aspect and the first aspect of the embodiment of the present invention; the information acquisition module is used for scanning the two-dimensional code of the road sign to obtain first information and second information of the two-dimensional code of the road sign; the first navigation module is used for obtaining a navigation path from the current position to the gate of the garden by combining the first information with a map system; and the second navigation module is used for calculating a navigation path from the park doorway to the target position according to the second information.
A fourth aspect of embodiments of the present invention provides a computer-readable storage medium storing computer instructions for causing a computer to execute the park navigation method according to any one of the second and fourth aspects of embodiments of the present invention.
A fifth aspect of an embodiment of the present invention provides an electronic device, including: a memory and a processor, the memory and the processor being communicatively coupled, the memory storing computer instructions, and the processor executing the computer instructions to perform the park navigation method according to any one of the second aspect and the second aspect of the embodiments of the present invention.
The technical scheme provided by the invention has the following effects:
according to the navigation two-dimensional code generation method provided by the embodiment of the invention, the plane graph is converted into the three-dimensional coordinate by adopting the park plane graph, and the three-dimensional coordinate of the mark position in the park plane graph is extracted to generate the landmark two-dimensional code. Therefore, the navigation in the garden can be realized by the user through the landmark two-dimensional code containing the specific position, and the technical problem that the navigation cost in the garden is higher in the existing RFID network is solved. In addition, according to the navigation two-dimensional code generation method provided by the embodiment of the invention, the generated landmark two-dimensional code not only contains the position information of different positions in the garden, but also contains the position information of the garden, so that the generated landmark two-dimensional code can be used for positioning to the garden by adopting a map system, the navigation in the garden can be realized, and the use experience of a user is improved.
According to the park navigation method and device provided by the embodiment of the invention, the landmark two-dimensional code of the target position to be visited by the user can be obtained through the landmark two-dimensional code generated by the navigation two-dimensional code generation method, and the position of the park where the target position is located and the position of the target position in the park can be obtained through scanning the landmark two-dimensional code, so that the user can reach the park according to the position of the park where the target position is located and a map system, and then reach the target position according to the position of the target position in the park. Therefore, the park navigation method and device provided by the embodiment of the invention realize the tracking of the park and the park range by the method for scanning and positioning the two-dimensional code of the road sign in the park, and solve the technical problem that the navigation cost of the existing RFID network in the park is higher.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flowchart of a navigation two-dimensional code generation method according to an embodiment of the present invention;
FIG. 2 is a flow chart of a park navigation method according to an embodiment of the present invention;
FIG. 3 is a block diagram of a campus navigation device according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a computer-readable storage medium provided according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As described in the background, current map systems, such as a high-resolution map or a Baidu map, are mainly used for navigation at two remote locations, but navigation in a certain park, such as a large mall, a shopping mall, and the like, cannot be achieved by using the existing map systems.
Based on this, an embodiment of the present invention provides a navigation two-dimensional code generation method, as shown in fig. 1, the navigation two-dimensional code generation method includes the following steps:
step S101: acquiring an integral plan of a park to be navigated; in a specific embodiment, the park to be navigated may be a larger park including both an indoor area and an outdoor area, such as a scientific and technological park, a commercial center, a shopping mall, a residential quarter, a school, a hospital, an airport, an enterprise and public institution, or may be an area where navigation cannot be achieved by using an existing map system. In one embodiment, the overall plan of the campus to be navigated may be pre-obtained from the campus doorway or the location where the plan is placed.
Step S102: carrying out electronic coding on the whole plane graph to obtain a three-dimensional coordinate of the park to be navigated; in an embodiment, when determining the three-dimensional coordinates, a preset position in the park to be navigated may be selected as an origin of the coordinate system, for example, a position of a highest building in the park may be selected as the origin, or other positions may be selected as the origin, which is not limited in the present invention. After the origin of the coordinate system is selected, a three-dimensional coordinate system may be established with the origin, for example, the three-dimensional coordinate system may be established in two directions perpendicular to each other on a horizontal plane and a vertical direction and the set origin. After the three-dimensional coordinate system is formed, the three-dimensional coordinates of each mark point in the overall plan view are determined according to the relative positions of each mark point and the origin displayed in the overall plan view and by combining the three-dimensional coordinate system.
Step S103: and generating a road sign two-dimensional code according to the three-dimensional coordinate, the position of the park to be navigated and the mark position in the park to be navigated. In an embodiment, after obtaining the three-dimensional coordinates of each mark point in the overall plan view, the three-dimensional coordinate information of the mark position in the park to be navigated can be extracted to generate a road sign two-dimensional code, for example, the three-dimensional coordinate information of an intersection, an elevator entrance, a landmark store, a landmark building, a parking lot and a shop can be extracted. The mark position can be determined every other preset distance in the parking lot, and the size of the preset distance can be set according to the specific size of the parking lot.
In an embodiment, when the landmark two-dimensional code is formed, the first information may be obtained according to the position of the park to be navigated. In particular, the first information may be determined based on a particular location of the campus on an existing mapping system. Then, second information is obtained according to the three-dimensional coordinates and the mark position in the park to be navigated; specifically, the second information may be obtained according to the determined three-dimensional coordinates corresponding to the mark position in the park to be navigated, and then the landmark two-dimensional code of the mark position in the park to be navigated is generated by combining the first information and the second information. Specifically, the first information and the second information can be input into the two-dimensional code generator together, and then the landmark two-dimensional code of the landmark position in the park to be navigated can be obtained. Therefore, the information contained in the two-dimensional code of the road sign at each mark position consists of two parts: namely a specific location of the campus and a specific location of the index location within the campus.
In an embodiment, the navigation two-dimensional code generating method further includes: and placing the generated two-dimensional code of the road sign at a corresponding sign position in the park and storing the two-dimensional code of the road sign and the corresponding sign position in the mobile terminal. Specifically, the generated landmark two-dimensional code may be placed at a position corresponding to the two-dimensional code, for example, the building two-dimensional code is placed at a doorway of a building, the two-dimensional code of a parking lot is placed at a corresponding position set in the parking lot, and the two-dimensional code of a store is placed at each store doorway; meanwhile, the generated two-dimensional code can be placed at the corresponding position on the park plan, so that the use of a user is facilitated. In addition, the generated landmark two-dimensional code can be stored on the mobile terminal or the cloud end, for example, when a park corresponding to the landmark two-dimensional code has an official website, the generated landmark two-dimensional code corresponding to the park can be placed in the official website, and the acquisition of a user is facilitated.
According to the navigation two-dimensional code generation method provided by the embodiment of the invention, the plane graph is converted into the three-dimensional coordinate by adopting the park plane graph, and the three-dimensional coordinate of the mark position in the park plane graph is extracted to generate the landmark two-dimensional code. Therefore, the navigation in the garden can be realized by the user through the landmark two-dimensional code containing the specific position, and the technical problem that the navigation cost in the garden is higher in the existing RFID network is solved. In addition, according to the navigation two-dimensional code generation method provided by the embodiment of the invention, the generated landmark two-dimensional code not only contains the position information of different positions in the garden, but also contains the position information of the garden, so that the generated landmark two-dimensional code can be used for positioning to the garden by adopting a map system, the navigation in the garden can be realized, and the use experience of a user is improved.
The embodiment of the invention also provides a park navigation method, as shown in fig. 2, the navigation method comprises the following steps:
step S110: acquiring a landmark two-dimensional code generated by the navigation two-dimensional code generation method according to the embodiment according to a target position; in an embodiment, when the landmark two-dimensional code is obtained, the landmark two-dimensional code can be obtained from a cloud end storing the landmark two-dimensional code. In a specific embodiment, when the park to which the user goes has the official website, the two-dimensional code of the corresponding position in the park can be acquired from the official website. For example, a user who wants to go to a certain shop in a certain business center may obtain a road sign two-dimensional code of the shop from an official website of the business center.
Step S120: scanning the two-dimensional code to obtain first information and second information of the two-dimensional code; specifically, after obtaining the landmark two-dimensional code corresponding to the target position, the landmark two-dimensional code may be scanned, and during scanning, any existing APP with a two-dimensional code scanning function may be used, for example, WeChat or other APPs; because the generated two-dimensional code of the road sign comprises the first information and the second information, the first information and the second information corresponding to the two-dimensional code of the road sign can be obtained after the two-dimensional code of the road sign is scanned.
Step S130: obtaining a first navigation path from the current position to the gate of the park by combining the first information with a map system; specifically, as can be seen from the above, the first information of the landmark two-dimensional code includes the location information of the campus where the target location is located, so that the location information of the campus included in the first information can be searched by using an existing map system, such as a Baidu map or a Gade map, to obtain a first navigation path from the current location to the campus. The user can reach the park where the target position is located according to the first navigation path.
Step S140: and calculating a second navigation path from the park doorway to the target position according to the second information. Specifically, the second information of the landmark two-dimensional code includes specific location information of the target location in the campus, for example, which building and which floor are located in the campus. The user can find the target position according to the position information contained in the scanned second information. In addition, the user can scan the landmark two-dimensional code of the current position after arriving at the park to obtain the position information of the current position, and then the mobile terminal can calculate and obtain a second navigation path from the current position to the target position based on the current position and the target position according to all the landmark two-dimensional codes in the park.
According to the park navigation method provided by the embodiment of the invention, the two-dimensional code of the landmark of the target position which the user wants to go can be obtained through the two-dimensional code of the landmark generated by the navigation two-dimensional code generation method, and the position of the park of the target position and the position of the target position in the park can be obtained through scanning the two-dimensional code of the landmark, so that the user can firstly reach the park according to the position of the park of the target position in combination with a map system, and then reach the target position according to the position of the target position in the park. Therefore, the campus navigation method provided by the embodiment of the invention realizes the tracking of the campus and the campus range by scanning and positioning the two-dimensional code of the landmark in the campus, and solves the technical problem of high navigation cost of the existing RFID network in the campus.
In one embodiment, the park navigation method may also be used for locating vehicles within a park parking lot. In one embodiment, the method comprises the following steps: acquiring and storing a two-dimensional code of a road sign at a parking position; when the vehicle is searched, a vehicle searching navigation path is calculated according to the two-dimensional code of the road sign at the current position and the two-dimensional code of the road sign at the parking position. In a specific implementation mode, when a user gets off a car in a parking lot of a park, the two-dimensional code of the road sign at the parking position can be scanned for memorizing, when the user leaves the park and wants to search the car, the two-dimensional code of the road sign at a position nearby is scanned for positioning again, the background calculates a route according to the two-dimensional code of the road sign and the two-dimensional code of the road sign at the parking position, and the park is navigated according to the two-dimensional code sequence of the road sign required to pass through, so that a car searching navigation path can be obtained.
In an embodiment, the park navigation method may also be used for searching shops, and in an embodiment, the park navigation method includes: acquiring and storing a two-dimensional code of a road sign at a target position in a shop overview map; and calculating to obtain the shop navigation path according to the two-dimensional code of the road sign at the current position and the two-dimensional code of the road sign at the target position in the shop overview map. In a specific embodiment, when the park is a shopping mall, the user may scan the landmark two-dimensional code corresponding to the target landmark on the landmark overview, scan the landmark two-dimensional code of the current location, and calculate a route according to the landmark two-dimensional code and the landmark two-dimensional code at the target landmark in the background for navigation.
An embodiment of the present invention further provides a park navigation apparatus, as shown in fig. 3, including:
a current obtaining module 10, configured to obtain, according to a target location, a landmark two-dimensional code generated by the navigation two-dimensional code generation method according to the foregoing embodiment; for details, refer to the related description of step S110 in the above method embodiment.
The information acquisition module 20 is configured to scan the landmark two-dimensional code to obtain first information and second information of the landmark two-dimensional code; for details, refer to the related description of step S120 in the above method embodiment.
The first navigation module 30 is configured to obtain a navigation path from the current position to a gate of the campus by combining the first information with a map system; for details, refer to the related description of step S130 in the above method embodiment.
And the second navigation module 40 is configured to calculate a navigation path from the park doorway to the target position according to the second information. For details, refer to the related description of step S140 in the above method embodiment.
According to the campus navigation device provided by the embodiment of the invention, the landmark two-dimensional code of the target position to be visited by the user can be obtained through the landmark two-dimensional code generated by the navigation two-dimensional code generation method, and the position of the target position in the campus can be obtained through scanning the landmark two-dimensional code, so that the user can reach the campus by combining a map system according to the position of the target position in the campus, and then reach the target position according to the position of the target position in the campus. Therefore, the campus navigation device provided by the embodiment of the invention realizes the tracking of the campus and in the campus range by scanning and positioning the two-dimensional code of the landmark in the campus, and solves the technical problem that the navigation cost of the existing RFID network in the campus is high.
The functional description of the campus navigation apparatus provided by the embodiment of the present invention refers to the descriptions of the campus navigation method in the above embodiments.
An embodiment of the present invention further provides a storage medium, as shown in fig. 4, on which a computer program 601 is stored, and when the instructions are executed by a processor, the steps of the park navigation method in the above embodiment are implemented. The storage medium is also stored with audio and video stream data, characteristic frame data, an interactive request signaling, encrypted data, preset data size and the like. The storage medium may be a magnetic Disk, an optical Disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a Flash Memory (Flash Memory), a Hard Disk (Hard Disk Drive, abbreviated as HDD), a Solid State Drive (SSD), or the like; the storage medium may also comprise a combination of memories of the kind described above.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a flash Memory (FlashMemory), a Hard Disk (Hard Disk Drive, abbreviated as HDD), a Solid-State Drive (SSD), or the like; the storage medium may also comprise a combination of memories of the kind described above.
An embodiment of the present invention further provides an electronic device, as shown in fig. 5, the electronic device may include a processor 51 and a memory 52, where the processor 51 and the memory 52 may be connected by a bus or in another manner, and fig. 5 takes the connection by the bus as an example.
The processor 51 may be a Central Processing Unit (CPU). The Processor 51 may also be other general purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components, or combinations thereof.
The memory 52, which is a non-transitory computer readable storage medium, may be used to store non-transitory software programs, non-transitory computer executable programs, and modules, such as the corresponding program instructions/modules in the embodiments of the present invention. The processor 51 executes various functional applications and data processing of the processor by executing non-transitory software programs, instructions and modules stored in the memory 52, that is, implementing the campus navigation method in the above method embodiments.
The memory 52 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created by the processor 51, and the like. Further, the memory 52 may include high speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, the memory 52 may optionally include memory located remotely from the processor 51, and these remote memories may be connected to the processor 51 via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The one or more modules are stored in the memory 52 and, when executed by the processor 51, perform the park navigation method in the embodiment shown in figure 2.
The details of the electronic device may be understood with reference to the corresponding related description and effects in the embodiment shown in fig. 2, and are not described herein again.
Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (10)
1. A navigation two-dimensional code generation method is characterized by comprising the following steps:
acquiring an integral plan of a park to be navigated;
carrying out electronic coding on the whole plane graph to obtain a three-dimensional coordinate of the park to be navigated;
and generating a road sign two-dimensional code according to the three-dimensional coordinate, the position of the park to be navigated and the sign position in the park to be navigated.
2. The navigation two-dimensional code generation method according to claim 1, wherein the electronic coding of the overall plan view to obtain the three-dimensional coordinates of the park to be navigated comprises:
selecting a preset position in a park to be navigated as an origin of a coordinate system;
and obtaining the three-dimensional coordinates of the park to be navigated according to the corresponding position information in the overall plan and the origin.
3. The navigation two-dimensional code generation method according to claim 1, wherein generating a landmark two-dimensional code according to the three-dimensional coordinate, the position of the park to be navigated, and the landmark position in the park to be navigated comprises:
obtaining first information according to the position of the park to be navigated;
obtaining second information according to the three-dimensional coordinates and the mark position in the park to be navigated;
and generating a road sign two-dimensional code according to the first information and the second information.
4. The navigation two-dimensional code generation method according to claim 1, further comprising: and placing the generated two-dimensional code of the road sign in a corresponding sign position in the park and storing the two-dimensional code of the road sign and the corresponding sign position in the mobile terminal, wherein the sign position comprises the corresponding positions of a crossing, an elevator entrance, a landmark store, a landmark building, a parking lot and a shop overview map in the park to be navigated.
5. A park navigation method, comprising:
acquiring a landmark two-dimensional code generated by the navigation two-dimensional code generation method according to any one of claims 1 to 4 according to a target position;
scanning the two-dimensional code to obtain first information and second information of the two-dimensional code;
obtaining a first navigation path from the current position to the gate of the park by combining the first information with a map system;
and calculating a second navigation path from the park doorway to the target position according to the second information.
6. The campus navigation method of claim 5 further comprising:
acquiring and storing a two-dimensional code of a road sign at a parking position;
and when the vehicle is searched, calculating to obtain a vehicle searching navigation path according to the two-dimensional code of the road sign at the current position and the two-dimensional code of the road sign at the parking position.
7. The campus navigation method of claim 5 further comprising:
acquiring and storing a two-dimensional code of a road sign at a target position in a shop overview map;
and calculating to obtain a shop navigation path according to the two-dimensional code of the road sign at the current position and the two-dimensional code of the road sign at the target position in the shop overview map.
8. A campus navigation device, comprising:
a current acquisition module, configured to acquire, according to a target location, a landmark two-dimensional code generated by the navigation two-dimensional code generation method according to any one of claims 1 to 4;
the information acquisition module is used for scanning the two-dimensional code of the road sign to obtain first information and second information of the two-dimensional code of the road sign;
the first navigation module is used for obtaining a navigation path from the current position to the gate of the garden by combining the first information with a map system;
and the second navigation module is used for calculating a navigation path from the park doorway to the target position according to the second information.
9. A computer-readable storage medium having stored thereon computer instructions for causing a computer to perform the park navigation method of any one of claims 5-7.
10. An electronic device, comprising: a memory and a processor communicatively coupled to each other, the memory storing computer instructions, the processor executing the computer instructions to perform the park navigation method of any one of claims 5-7.
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