CN102023289A - Electronic device and map display method - Google Patents

Abstract

The invention relates to a map display method, which comprises the following steps of: receiving a satellite signal transmitted by a satellite, and generating the current position information for reflecting the current position of an electronic device provided with a global positioning system (GPS) signal receiving module according to the received satellite signal; acquiring the resolution of a display screen of the electronic device; establishing a mapping relationship between the current position information and the display screen by taking the current position information as the center of the display screen; acquiring a position information group corresponding to the edge of the display screen according to the acquired resolution and the established mapping relationship; transmitting the current position information and the position information group to a map server in network connection with the electronic device; receiving corresponding preset map data transmitted by the map server according to the current position information and the position information group; and displaying a map matched with the display screen in the display screen according to the received map data. The invention also provides the electronic device with navigation function.

Description

Electronic device and map display method

technical field

The invention relates to the field of navigation, in particular to an electronic device and a map display method.

Background technique

Global Positioning System (GPS, Global Positioning System) has been widely used in mobile electronic devices as personal navigation devices. According to the existing method: the mobile electronic device pre-stores a map with a large amount of data. After the navigation function of the mobile electronic device is activated, the mobile electronic device receives signals from GPS satellites and generates signals for responding to movement by processing the received signals. The current location information of the current location of the electronic device, and then select the corresponding map from the pre-stored maps to display according to the generated current location information, and mark the current location of the mobile electronic device in the displayed map.

However, due to the relatively large amount of map data pre-stored in the mobile electronic device (the data volume is above 1G), the storage space of the mobile electronic device is occupied, and the storage space of the mobile electronic device becomes insufficient, and the mobile electronic device cannot respond in time. In addition, the user needs to spend time updating the map stored in the mobile electronic device to ensure the integrity of the geographical information in the map. In this way, the user is inconvenienced in use.

Contents of the invention

In view of this, it is necessary to provide an electronic device with a navigation function that is convenient for users to use.

It is also necessary to provide a map display method.

An electronic device for connecting to a map server, the electronic device includes a GPS signal receiving module, a control module, a communication module and a display screen, the GPS signal receiving module is used to receive positioning signals sent by artificial satellites, and generate The current location information of the electronic device. The control module is used to obtain the resolution of the display screen, and use the current position information as the center of the display screen to establish a mapping relationship between the current position information and the display screen, and generate a A location information group corresponding to a coordinate point corresponding to a pixel point, and sending the current location information and the location information group to a map server establishing a network connection with the electronic device through the communication module. The control module is also used to provide the map data received by the communication module and transmitted by the map server according to the current location information and the location information group and adapted to the size of the display screen for display on the display screen.

A method for displaying a map, comprising the steps of:

Receive the satellite signal transmitted by the satellite, and generate the current position information corresponding to the current position of the electronic device equipped with the GPS signal receiving module according to the received satellite signal;

Acquiring the resolution of the display screen of the electronic device;

Taking the current location information as the center of the display screen, establishing a mapping relationship between the current location information and the display screen;

Obtain the position information group corresponding to the edge of the display screen according to the obtained resolution and the established mapping relationship;

Send the current location information and the location information group to the map server that establishes a network connection with the electronic device;

receiving the corresponding preset map data sent by the map server according to the current location information and the location information group;

A map suitable for the display screen is displayed on the display screen according to the received map data.

Through the above electronic device and map display method, after the user turns on the navigation function of the electronic device, the electronic device sends the generated current location information and the location information group corresponding to the edge of the display screen to a professional map server that establishes a network connection with the electronic device, to obtain a map that fits the size of the display screen from the map server. In this way, the user can use the electronic device to find his current location and the surrounding geographical environment without the need of storing map data in the electronic device and regularly updating the stored map data.

Description of drawings

FIG. 1 is a schematic diagram of a network architecture of an electronic device in a preferred embodiment.

FIG. 2 is a functional block diagram of the electronic device in FIG. 1 .

FIG. 3 is a functional block diagram of a control module in the electronic device of FIG. 2 .

FIG. 4 is a functional block diagram of a control module of an electronic device in another preferred embodiment.

Fig. 5 is a flowchart of a map display method in a preferred embodiment.

Detailed ways

As shown in FIG. 1 , it is a schematic diagram of a network architecture of an electronic device 30 in a preferred embodiment. The electronic device 30 is connected to the map server 40 through the network 20 . The electronic device 30 receives the positioning signal 10 sent by the artificial satellite, and generates current position information according to the received positioning signal 10 . The electronic device 30 provides the current location information to the map server 40 through the network 20, and receives the map data provided by the map server 40 according to the received current location information. The electronic device 30 displays a map according to the received map data for user's reference. The electronic device 30 can be a mobile phone with a navigation function, a personal digital assistant, a handheld game console, and the like. The network connection established by the electronic device 30 and the map server 40 may be wireless, wired, or a combination of wireless and wired. Various maps are stored in the map server 40, and the data in the maps can be updated dynamically.

Please also refer to FIG. 2 , the electronic device 30 includes a GPS signal receiving module 31 , an input module 32 , a control module 33 , a communication module 34 and a display screen 35 .

The GPS signal receiving module 31 is used for receiving positioning signals 10 sent by artificial satellites, and generating current position information according to the received positioning signals 10 , and providing the current position information to the control module 33 . Wherein, the current location information is a coordinate point in a space Cartesian coordinate system, and the current location information includes a longitude value, a latitude value and an altitude value.

The input module 32 is used to respond to the user's input operation and generate corresponding input information. For example, the input module 32 may be a button, a touch screen, and the like.

The display screen 35 is used to display the data provided by the control module 33 . For example, the display screen 35 may be a liquid crystal display.

The control module 33 is used to obtain the resolution of the display screen 35, and take the current position information as the center of the display screen 35 to establish a mapping relationship between the current position information and the display screen, and generate and Display the position information group corresponding to the coordinate point corresponding to the edge pixel point of the display screen 35 , and send the current position information and the position information group to the map server 40 which establishes a network connection with the electronic device 30 through the communication module 33 . Wherein, the above-mentioned mode of establishing the mapping relationship is as follows: the current position information in the spatial rectangular coordinate system is transformed into the earth coordinate system and the Gaussian coordinate system to obtain a coordinate point under the plane rectangular coordinate system, and the coordinate point is aligned with the center of the display screen 35 The coordinate points corresponding to the pixel points correspond to each other. The position information group includes a plurality of position information corresponding to edge coordinate points of the display screen 35 .

The control module 33 is also used to provide the map data adapted to the size of the display screen 35 received by the communication module 34 and transmitted by the map server 40 according to the current location information and the location information group to the display screen 35 for display.

Referring to FIG. 3 , the control module 33 includes a central processing unit (Central Processing Unit, CPU) 330 and a memory 331. The memory 331 is used to store operating system programs and application programs. Wherein, the application program includes a resolution acquisition program 333 , a coordinate point conversion program 334 , an edge coordinate point generation program 335 , and an operating system program 332 . The CPU 330 running the operating system program 332 can manage and control the GPS signal receiving module 31 , the input module 32 , the communication module 34 , the memory 331 and the display screen 35 in the electronic device 30 . For example, the central processing unit 240 executes the application program according to an instruction generated by the input module 32 in response to the user's operation of enabling the navigation function of the electronic device 30 .

The central processing unit 330 generates the following functional units after running the application program:

A resolution acquisition unit, configured to acquire the resolution of the display screen 35;

The coordinate point conversion unit is used to establish a mapping relationship between the current position information and the display screen 35, and convert the coordinate points corresponding to the pixels on the display screen 35 into position information related to the current position information according to the mapping relationship.

The edge coordinate point generating unit is configured to generate coordinate points corresponding to edge pixels of the display screen 35 according to the acquired resolution of the display screen 35, and provide the generated coordinate points to the coordinate point conversion unit.

For example, the resolution of the display screen 35 acquired by the resolution acquisition unit is 320x240. The coordinate point conversion unit converts the current position information into the coordinate point under the plane Cartesian coordinate system as (a, b), and the coordinate point (a, b) corresponds to the coordinate point (160, 120) corresponding to the center of the display screen 35 . The edge coordinate point generation unit calculates a coordinate point corresponding to a pixel point on the edge of the display screen 35, such as coordinate point (160, 240), and provides the coordinate point (160, 240) to the coordinate point conversion unit. The coordinate point conversion unit converts the coordinate point (160, 240) into (a, b+120), and converts (a, b+120) into position information.

In this embodiment, the electronic device 30 requires the map server 40 to transmit the same map as the display size of the display screen 35, so it will not receive a map larger than the display size of the display screen 35. Service) network connected to the map server 40, the data traffic between the electronic device 30 and the map server 40 can be reduced.

In another preferred embodiment, the control module 33 also judges whether the current location information generated in real time by the GPS signal receiving module 31 exceeds the boundary of the map currently displayed on the display screen 35, and when it is judged that the current location information exceeds the currently displayed map When the boundary of the map server 40 is re-requested to provide the corresponding map; the control module 33 also responds to the user's operation of selecting the point of interest on the map displayed on the display screen 35, generates the point of interest position information, and sends the point of interest position information by the communication module 34 And pre-stored interest information to the map server 40. The interest information may be a snack bar, a bus stop, a bank, and the like. The map server 40 provides corresponding information to the electronic device 30 according to the received POI location information and interest information. In addition, the input module 32 and the display screen 35 in the electronic device 30 can be replaced by a touch screen.

Please refer to FIG. 4 at the same time. Correspondingly, the interest information is stored in the memory 331 , and the application program also includes subroutines such as the interest point position information generation program 336 and the cross-border judgment program 337 . The central processing unit 330 also produces the following functional units after running the application program:

A point of interest coordinate generation unit, used to respond to the user's operation of selecting a point of interest on the currently displayed map, generate a coordinate point corresponding to the point of interest, and provide it to the coordinate point conversion unit, so as to obtain the position of the point of interest by using the coordinate point conversion unit information.

A border-crossing judging unit, used to compare the current position information generated by the GPS signal receiving module 31 with the position information in the position information group, to determine whether the current position of the electronic device 30 exceeds the boundary of the displayed current map, and determine whether the electronic When the current position of the device 30 exceeds the boundary of the currently displayed map, the coordinate point conversion unit and the edge coordinate point generation unit are called to work.

For example, when the user clicks a point of interest on the map displayed on the touch screen with a stylus, the control module 33 acquires the coordinate point corresponding to the pixel point that the stylus touches with the touch screen, and then converts the coordinate point into a current map according to the mapping relationship. Point of interest position information related to the position information; the control module 33 also judges whether the current position information produced by the GPS signal receiving module 31 exceeds the boundary of the map currently displayed on the touch screen, and judges that the current position information produced by the GPS signal receiving module 31 does not exceed the map When the boundary of the point of interest is reached, the communication module 34 sends the location information of the point of interest and the pre-stored interest information to the map server 40 . The map server 40 provides corresponding information to the electronic device 30 according to the received POI location information and interest information.

As shown in Figure 5, it is a flowchart of a map display method in a preferred embodiment, the method includes the following steps:

Step S601, receiving a satellite signal transmitted by a satellite, and generating current location information reflecting the current location of an electronic device equipped with a GPS signal receiving module according to the received satellite signal. Wherein, the current location information is a coordinate point in a space Cartesian coordinate system, and the current location information includes a longitude value, a latitude value and an altitude value.

Step S602, acquiring the resolution of the display screen of the electronic device.

Step S603, taking the current location information as the center of the display screen, and establishing a mapping relationship between the current location information and the display screen. The above method of establishing the mapping relationship is as follows: convert the current position information in the spatial rectangular coordinate system into the earth coordinate system and the Gaussian coordinate system to obtain a coordinate point in the plane rectangular coordinate system, and correspond the coordinate point to the central pixel point of the display screen correspond to the coordinate points.

Step S605, according to the obtained resolution and the established mapping relationship, the position information group corresponding to the edge of the display screen is obtained.

Step S607, sending the current location information and the location information group to the map server establishing network connection with the electronic device.

Step S609, receiving corresponding preset map data transmitted by the map server according to the current location information and the location information group.

Step S611, displaying a map suitable for the display screen on the display screen according to the received map data.

In other embodiments, the map display method also includes the following steps:

Judging whether the current position information generated in real time by the GPS signal receiving module exceeds the boundary of the current map displayed on the display screen;

When it is determined that the current location information exceeds the boundary of the map currently displayed on the display screen, the map server is re-requested to provide the corresponding map.

In other embodiments, the map displayed on the display screen may also be updated by judging whether the current location information deviates from the center point of the display screen.

Through the above electronic device and map display method, after the user turns on the navigation function of the electronic device, the electronic device sends the generated current location information and the location information group corresponding to the edge of the display screen to a professional map server that establishes a network connection with the electronic device, to obtain a map that fits the size of the display screen from the map server. In this way, the user can use the electronic device to find his current location and the surrounding geographical environment without the need of storing map data in the electronic device and regularly updating the stored map data.

Claims (9)

1. An electronic device is used to connect to a map server. The electronic device includes a GPS signal receiving module, a control module, a communication module and a display screen. The GPS signal receiving module is used to receive positioning signals sent by artificial satellites, and according to the received positioning The current location information of the signal generating electronic device is characterized in that: the control module is used to obtain the resolution of the display screen, and the current location information is used as the center of the display screen to establish a mapping relationship between the current location information and the display screen, and according to the acquired The resolution and the established mapping relationship generate the position information group corresponding to the coordinate point corresponding to the pixel point on the edge of the display screen, and send the current position information and the position information group to the map server through the communication module, and the control module is also used for The map data received by the communication module and transmitted by the map server according to the current location information and the location information group and adapted to the size of the display screen is provided to the display screen for display. 2. The electronic device according to claim 1, characterized in that: the way of establishing the mapping relationship is: converting the current position information to a coordinate point in the Cartesian coordinate system, and corresponding the coordinate point to the central pixel point of the display screen corresponding to the coordinate points. 3. The electronic device according to claim 2, wherein the control module is also used for judging in real time whether the current location information generated by the GPS signal receiving module in real time exceeds the boundary of the map currently displayed on the display screen, and when judging the current When the location information exceeds the boundary of the currently displayed map, re-request the map server to provide the corresponding map. 4. The electronic device according to claim 3, wherein the control module is further configured to respond to the user's operation of selecting and displaying a point of interest on the current map to generate position information of the point of interest, and send the position information of the point of interest through the communication module and pre-stored interest information to the map server. 5. The electronic device as claimed in claim 4, wherein the display screen is a touch screen. 6. The electronic device according to claim 4, wherein the control module comprises a central processing unit and a memory, the memory is used to store an application program, and the central processing unit generates the following functional units after running the application program: a resolution acquisition unit, configured to acquire the resolution of the display screen; The coordinate point conversion unit is used to establish a mapping relationship between the current position information and the display screen, and convert the coordinate points corresponding to the pixels on the display screen into position information related to the current position information according to the mapping relationship; An edge coordinate point generating unit, configured to generate coordinate points corresponding to edge pixels of the display screen according to the acquired resolution of the display screen, and provide the generated coordinate points to the coordinate point conversion unit; A border-crossing judging unit, used to compare the current position information generated by the GPS signal receiving module 31 with the position information in the position information group, to determine whether the current position of the electronic device 30 exceeds the boundary of the displayed current map, and determine whether the electronic When the current position of the device 30 exceeds the boundary of the currently displayed map, the coordinate point conversion unit and the edge coordinate point generation unit are called to work; A point of interest coordinate generation unit, used to respond to the user's operation of selecting a point of interest on the current map displayed on the display screen, generate a coordinate point corresponding to the point of interest, and provide it to the coordinate point conversion unit, so as to use the coordinate point conversion unit to obtain the point of interest Click Location Information. 7. A method for displaying a map, comprising the steps of: Receive the satellite signal transmitted by the satellite, and generate the current position information corresponding to the current position of the electronic device equipped with the GPS signal receiving module according to the received satellite signal; Acquiring the resolution of the display screen of the electronic device; Taking the current location information as the center of the display screen, establishing a mapping relationship between the current location information and the display screen; Obtain the position information group corresponding to the edge of the display screen according to the obtained resolution and the established mapping relationship; Send the current location information and the location information group to the map server that establishes a network connection with the electronic device; receiving the corresponding preset map data sent by the map server according to the current location information and the location information group; A map suitable for the display screen is displayed on the display screen according to the received map data. 8. The map display method according to claim 7, characterized in that: the method further comprises the following steps: Judging whether the current position information generated in real time by the GPS signal receiving module exceeds the boundary of the map currently displayed on the display screen; When it is determined that the current location information exceeds the boundary of the map currently displayed on the display screen, the map server is re-requested to provide the corresponding map. 9. The map display method according to claim 7, characterized in that: the way of establishing the mapping relationship is: converting the current position information to a coordinate point under the Cartesian coordinate system, and corresponding the coordinate point to the central pixel point of the display screen correspond to the coordinate points.

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