CN111258703B - Map display control method, intelligent terminal and storage medium - Google Patents
Map display control method, intelligent terminal and storage medium Download PDFInfo
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Abstract
The invention discloses a map display control method, an intelligent terminal and a storage medium, wherein the method comprises the following steps: designating parameters of a map display range, and judging whether the parameters of the map display range are valid or not; if the parameters of the map display range are valid, judging whether the number of the geographic elements is larger than a preset value; if the number of the geographic elements is larger than a preset value, calculating a closed rectangle formed by a plurality of geographic elements and an expanded target rectangle display range, and controlling the map to adjust and display the closed rectangle and the expanded target rectangle display range as the target rectangle range. The invention can designate the self-adaptive range of the map, automatically present the map elements to be displayed at the designated screen position, support the display screen with any resolution and provide better support for GIS data visualization.
Description
Technical Field
The present invention relates to the field of data visual application technologies, and in particular, to a map display control method, an intelligent terminal, and a storage medium.
Background
With the widespread development of data visual application of GIS (Geographic Information System or Geo-Information system, a specific and very important spatial information system, it is a technical system for collecting, storing, managing, calculating, analyzing, displaying and describing the related geographic distribution data in the whole or part of the earth surface (including the atmosphere) space under the support of computer hardware and software systems, and map adaptive adjustment is also frequently used in various professional systems.
As a basic and practical function, the self-adaptive function of the current map is realized mainly by adjusting the level and the center point of the map according to the existing point location data or route data so that the map elements are fully presented in the whole browser interface or the whole map visual interface. Aiming at the situation that special requirements exist, for example, in a general map visualization system interface, a map is tiled to serve as a base map, a title bar or a statistical table is displayed on the upper, lower, left and right sides of the map, and the map point effect is displayed in one of a plurality of parts. The prior art cannot realize the self-adaption of the map in a specified range, and conveniently enables map elements to be displayed in a specified area of a better visual map level according to requirements.
Accordingly, the prior art is still in need of improvement and development.
Disclosure of Invention
The invention mainly aims to provide a map display control method, an intelligent terminal and a storage medium, and aims to solve the defects in the prior art.
In order to achieve the above object, the present invention provides a map display control method comprising the steps of:
designating parameters of a map display range, and judging whether the parameters of the map display range are valid or not;
if the parameters of the map display range are valid, judging whether the number of the geographic elements is larger than a preset value;
if the number of the geographic elements is larger than a preset value, calculating a closed rectangle formed by a plurality of geographic elements and an expanded target rectangle display range, and controlling the map to adjust and display the closed rectangle and the expanded target rectangle display range as the target rectangle range.
Optionally, the map display control method, wherein the parameters include: a start location, an end location, a set of map element coordinates points, and a parameter spaced from the perimeter.
Optionally, the map display control method, wherein the determining whether the parameter of the map display range is valid further includes:
and if the parameters of the map display range are invalid, adjusting the parameters of the map display range until the parameters of the map display range are valid.
Optionally, in the map display control method, if the number of the geographic elements is greater than a preset value, calculating a closed rectangle formed by a plurality of geographic elements and an expanded target rectangle display range, and controlling the map to be adjusted and displayed as the target rectangle range specifically includes:
if the number of the geographic elements is larger than a preset value, calculating a closed rectangle formed by a plurality of geographic elements;
and calculating the expanded target rectangle display range according to the display start-stop range parameter and the closed rectangle formed by the geographic elements.
Optionally, the map display control method, wherein the calculating the expanded target rectangle display range according to the display start-stop range parameter and the closed rectangle formed by the geographic elements further includes:
and calling a map boundary interface provided by the map SDK according to the parameter and the peripheral interval parameter in the parameters and the calculated target rectangular display range, and controlling the map to adjust and display the map as the target rectangular range.
Optionally, in the map display control method, the determining whether the number of the geographic elements is greater than a preset value further includes:
if the number of the geographic elements is not greater than a preset value, acquiring a range boundary and a map center point of the current map display, and calculating a longitude and latitude difference A between the map center point and an element coordinate point;
calculating a span value according to a display start-stop range provided by the parameters, calculating a latitude and longitude offset value B, and calculating a new map center point according to the map center point, the latitude and longitude difference value A and the offset value B;
and calling a map center point interface of the map SDK, switching the map viewpoint, and adjusting and displaying the map viewpoint as a target range.
Optionally, in the map display control method, the parameter of the interval between the map display and the surrounding is specifically: the unit of the distance between the display screen and the display screen is screen pixels.
Optionally, in the map display control method, the preset value is 1.
In addition, to achieve the above object, the present invention further provides an intelligent terminal, where the intelligent terminal includes: the map display control program comprises a memory, a processor and a map display control program which is stored in the memory and can run on the processor, wherein the map display control program realizes the steps of the map display control method when being executed by the processor.
In addition, in order to achieve the above object, the present invention also provides a storage medium storing a map display control program which, when executed by a processor, implements the steps of the map display control method as described above.
The method comprises the steps of judging whether parameters of a map display range are valid or not through specifying the parameters of the map display range; if the parameters of the map display range are valid, judging whether the number of the geographic elements is larger than a preset value; if the number of the geographic elements is larger than a preset value, calculating a closed rectangle formed by a plurality of geographic elements and an expanded target rectangle display range, and controlling the map to adjust and display the closed rectangle and the expanded target rectangle display range as the target rectangle range. The invention can designate the self-adaptive range of the map, automatically present the map elements to be displayed at the designated screen position, support the display screen with any resolution and provide better support for GIS data visualization.
Drawings
FIG. 1 is a flow chart of a preferred embodiment of the map display control method of the present invention;
FIG. 2 is a flow chart illustrating the whole execution flow in a preferred embodiment of the map display control method of the present invention;
FIG. 3 is a diagram illustrating parameters of the inter-peripheral space in a preferred embodiment of the map display control method according to the present invention;
FIG. 4 is a schematic view of a closed-end rectangle formed by 5 geographic element coordinates in the display parameters in a preferred embodiment of the map display control method of the present invention;
FIG. 5 is a schematic diagram of the map display control method according to the present invention, wherein the closed rectangle is divided into 12 parts along the X-axis according to the display start and stop positions of 5-12;
FIG. 6 is a diagram illustrating a map adjustment display as a target rectangular range in a preferred embodiment of the map display control method of the present invention;
FIG. 7 is a schematic diagram of an operating environment of a smart terminal according to a preferred embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clear and clear, the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The map display control method according to the preferred embodiment of the present invention, as shown in fig. 1 and 2, comprises the following steps:
step S10, designating parameters of a map display range, and judging whether the parameters of the map display range are valid or not;
step S20, if the parameters of the map display range are valid, judging whether the number of the geographic elements is larger than a preset value;
and step S30, if the number of the geographic elements is larger than a preset value, calculating a closed rectangle formed by a plurality of geographic elements and an expanded target rectangle display range, and controlling the map to adjust and display the closed rectangle and the expanded target rectangle display range as the target rectangle range.
Specifically, as shown in fig. 2, the implementation process of the whole technical scheme is as follows:
starting;
a parameter specifying a map display range, wherein the parameter includes: a start position, an end position, a map element coordinate point set, and a peripheral interval parameter;
judging whether the parameters of the map display range are valid or not;
if the parameters of the map display range are invalid, adjusting the parameters of the map display range until the parameters of the map display range are valid;
if the parameters of the map display range are valid, judging whether the number of the geographic elements is larger than a preset value, wherein the preset value is preferably 1;
if the number of the geographic elements is larger than a preset value, calculating a closed rectangle formed by a plurality of geographic elements, and calculating an expanded target rectangle display range according to the display start-stop range parameter and the closed rectangle formed by the geographic elements;
according to the parameter and the peripheral interval parameter in the parameters and the calculated target rectangle display range, calling a map boundary interface provided by a map SDK, and controlling the map to adjust and display as the target rectangle range;
if the number of the geographic elements is not greater than a preset value, acquiring a range boundary and a map center point of the current map display, and calculating a longitude and latitude difference A between the map center point and an element coordinate point;
calculating a span value according to a display start-stop range provided by the parameters, calculating a latitude and longitude offset value B, and calculating a new map center point according to the map center point, the latitude and longitude difference value A and the offset value B;
calling a map center point interface of the map SDK, switching map view points, and adjusting and displaying the map view points as a target range;
and (5) ending.
Further, parameters of the map display range are specified first: the method comprises a starting position, a terminating position, a map element coordinate point set and a peripheral interval parameter, wherein the peripheral interval parameter is specifically as follows: the unit of the distance from the upper, lower, left and right of the display screen (screen) is screen pixel, and the parameter of the distance from the periphery is for the display range of the display screen, as shown in fig. 3.
The specified map display range Parameter object is Parameter, and the start position start, the end position end, the map element coordinate point set coordinates and the peripheral interval margin are as follows:
the advantages of this arrangement are: the geographical elements to be displayed can be flexibly defined to be displayed at the designated positions, in particular to the intervals from which position is started to which position is ended and from top to bottom, left to right of the display screen; the map element to be displayed may be one or a plurality of map elements.
The validity of the judging parameter is specifically as follows: the visual interface of the map is divided into 12 equal parts according to the X axis, the starting and stopping range values are required to be between 0 and 12, and meanwhile, the start value is required to be smaller than or equal to the end value, as shown in fig. 5, the map is divided into 12 parts, and the start value and the end represent the display area: starting from the same part to the same part; the point set is an array, and the number of the contained elements is more than or equal to 1; the interval parameter may or may not be given, and the default value is all 0.
And judging that the parameters are effective, and displaying the required map elements in the expected area only by the follow-up map self-adaptive adjustment.
Further, after judging that the number of the geographic elements is larger than 1, calculating a closed rectangle formed by the map elements, and calculating an expanded target rectangle display range according to the display start-stop range parameters and the closed rectangle formed by the geographic elements; the geographic elements are point icons displayed on the map, and as shown in fig. 4, there are 5 drop-shaped point icons on the map, which represent 5 geographic elements.
As shown in fig. 4, the set of coordinates points of the rectangle (all elements within the rectangle) closed at the end and composed of the coordinates of 5 geographical elements in the display parameter coordinates is [ [113.9925,22.587404], [114.046629,22.587404], [114.046629,22.624486], [113.9925,22.624486], [113.9925,22.587404] ].
Dividing the closed rectangle into 12 parts along the X axis according to the display start and stop positions of 5-12 parts; the longitude value of the unit interval is calculated as shown in fig. 5.
Then, calculating the display range of the expanded target rectangle (namely, coordinates of the left bottom point and the right top point of the target rectangle) according to the known data: firstly, calculating the occupied range (end-start+1) of a closed rectangle, and calculating the longitude of the left lower point of a target rectangle: the longitude of the lower left corner of the initial closed rectangle minus the longitude difference of the unit interval times the start-1 can be used for calculating the longitude of the upper right corner of the target rectangle, and in addition, the latitude of the lower left corner and the latitude of the upper right corner of the target rectangle are equal to those of the initial closed rectangle, so that the final range of the target rectangle can be obtained.
Further, according to the interval value provided by the parameter and the calculated target rectangular range, a map boundary interface provided by the map SDK can be called, so that the map is adjusted and displayed as the target rectangular range.
The whole display range is a target area, as shown in fig. 6, the right square frame is an initial closed area, the display range is displayed in a 5-12 interval according to requirements, and the intervals between the display range and the upper, lower, left and right are 10,10,30,30 respectively; this has the advantage that the display range can be fully customized, allowing the geographic elements to be automatically displayed in a particular range.
When only one geographic element exists, firstly acquiring a range boundary and a map center point of the current map display, and calculating a longitude and latitude difference A between the center point and a coordinate point of the element; and calculating a span value according to the display start-stop range provided by the parameters, further calculating a deviation value B of longitude and latitude, calculating a new map center point by combining the AB deviation value on the basis of the map center point, and finally calling a map center point interface of the map SDK to switch the map viewpoint in a gentle mode and adjust the display as a target range.
The invention provides a map self-adaption method applicable to any display screen and capable of designating a display range, which supports display screens with various resolutions on GIS data visual application, self-adaption adjustment is carried out, manual dragging is not needed, and visual elements on a map are smoothly presented in the designated range at a good visual angle.
According to the technical scheme provided by the invention, the self-adaptive range of the map can be designated, the map elements to be displayed can be automatically displayed at the designated screen position, the user experience can be effectively improved, meanwhile, the display screen with any resolution is supported, and better support can be provided for GIS data visualization.
Further, as shown in fig. 7, based on the map display control method, the present invention further provides an intelligent terminal, which includes a processor 10, a memory 20 and a display 30. Fig. 7 shows only some of the components of the intelligent terminal, but it should be understood that not all of the illustrated components are required to be implemented, and more or fewer components may alternatively be implemented.
The memory 20 may in some embodiments be an internal storage unit of the smart terminal, such as a hard disk or a memory of the smart terminal. The memory 20 may also be an external storage device of the Smart terminal in other embodiments, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card) or the like. Further, the memory 20 may also include both an internal storage unit and an external storage device of the smart terminal. The memory 20 is used for storing application software installed in the intelligent terminal and various data, such as program codes for installing the intelligent terminal. The memory 20 may also be used to temporarily store data that has been output or is to be output. In one embodiment, the memory 20 stores a map display control program 40, and the map display control program 40 is executable by the processor 10 to implement the map display control method in the present application.
The processor 10 may in some embodiments be a central processing unit (Central Processing Unit, CPU), microprocessor or other data processing chip for executing program code or processing data stored in the memory 20, for example, for performing the map display control method or the like.
The display 30 may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, an OLED (Organic Light-Emitting Diode) touch, or the like in some embodiments. The display 30 is used for displaying information on the intelligent terminal and for displaying a visual user interface. The components 10-30 of the intelligent terminal communicate with each other via a system bus.
In one embodiment, the following steps are implemented when the processor 10 executes the map display control program 40 in the memory 20:
designating parameters of a map display range, and judging whether the parameters of the map display range are valid or not;
if the parameters of the map display range are valid, judging whether the number of the geographic elements is larger than a preset value;
if the number of the geographic elements is larger than a preset value, calculating a closed rectangle formed by a plurality of geographic elements and an expanded target rectangle display range, and controlling the map to adjust and display the closed rectangle and the expanded target rectangle display range as the target rectangle range.
The parameters include: a start location, an end location, a set of map element coordinates points, and a parameter spaced from the perimeter.
The determining whether the parameters of the map display range are valid further includes:
and if the parameters of the map display range are invalid, adjusting the parameters of the map display range until the parameters of the map display range are valid.
If the number of the geographic elements is greater than a preset value, calculating a closed rectangle formed by a plurality of geographic elements and an expanded target rectangle display range, and controlling the map to adjust and display the closed rectangle and the expanded target rectangle display range as the target rectangle range, wherein the method specifically comprises the following steps:
if the number of the geographic elements is larger than a preset value, calculating a closed rectangle formed by a plurality of geographic elements;
and calculating the expanded target rectangle display range according to the display start-stop range parameter and the closed rectangle formed by the geographic elements.
The expanded target rectangle display range is calculated according to the display start-stop range parameter and the closed rectangle formed by the geographic elements, and then the method further comprises the following steps:
and calling a map boundary interface provided by the map SDK according to the parameter and the peripheral interval parameter in the parameters and the calculated target rectangular display range, and controlling the map to adjust and display the map as the target rectangular range.
Judging whether the number of the geographic elements is larger than a preset value or not, and then further comprising:
if the number of the geographic elements is not greater than a preset value, acquiring a range boundary and a map center point of the current map display, and calculating a longitude and latitude difference A between the map center point and an element coordinate point;
calculating a span value according to a display start-stop range provided by the parameters, calculating a latitude and longitude offset value B, and calculating a new map center point according to the map center point, the latitude and longitude difference value A and the offset value B;
and calling a map center point interface of the map SDK, switching the map viewpoint, and adjusting and displaying the map viewpoint as a target range.
The parameters of the interval between the peripheral parts are specifically as follows: the unit of the distance between the display screen and the display screen is screen pixels.
The preset value is 1.
The present invention also provides a storage medium storing a map display control program which, when executed by a processor, implements the steps of the map display control method described above.
In summary, the present invention provides a map display control method, an intelligent terminal and a storage medium, where the method includes: designating parameters of a map display range, and judging whether the parameters of the map display range are valid or not; if the parameters of the map display range are valid, judging whether the number of the geographic elements is larger than a preset value; if the number of the geographic elements is larger than a preset value, calculating a closed rectangle formed by a plurality of geographic elements and an expanded target rectangle display range, and controlling the map to adjust and display the closed rectangle and the expanded target rectangle display range as the target rectangle range. The invention can designate the self-adaptive range of the map, automatically present the map elements to be displayed at the designated screen position, support the display screen with any resolution and provide better support for GIS data visualization.
Of course, those skilled in the art will appreciate that implementing all or part of the above-described methods may be implemented by a computer program for instructing relevant hardware (such as a processor, a controller, etc.), where the program may be stored in a computer-readable storage medium, and where the program may include the steps of the above-described method embodiments when executed. The storage medium may be a memory, a magnetic disk, an optical disk, or the like.
It is to be understood that the invention is not limited in its application to the examples described above, but is capable of modification and variation in light of the above teachings by those skilled in the art, and that all such modifications and variations are intended to be included within the scope of the appended claims.
Claims (8)
1. A map display control method, characterized by comprising:
designating parameters of a map display range, and judging whether the parameters of the map display range are valid or not;
if the parameters of the map display range are valid, judging whether the number of the geographic elements is larger than a preset value;
if the number of the geographic elements is larger than a preset value, calculating a closed rectangle formed by a plurality of geographic elements and an expanded target rectangle display range, and controlling the map to adjust and display the closed rectangle and the expanded target rectangle display range as the target rectangle range;
if the number of the geographic elements is greater than a preset value, calculating a closed rectangle formed by a plurality of geographic elements and an expanded target rectangle display range, and controlling the map to adjust and display the closed rectangle and the expanded target rectangle display range as the target rectangle range, wherein the method specifically comprises the following steps:
if the number of the geographic elements is larger than a preset value, calculating a closed rectangle formed by a plurality of geographic elements;
calculating an expanded target rectangle display range according to the display start-stop range parameter and the closed rectangle formed by the geographic elements;
according to the parameter and the peripheral interval parameter in the parameters and the calculated target rectangle display range, calling a map boundary interface provided by a map SDK, and controlling the map to adjust and display as the target rectangle range;
on the GIS data visual application, display screens with various resolutions are supported, self-adaptive adjustment is carried out, manual dragging is not needed, and visual elements on a map are smoothly presented in a specified range from a good visual angle.
2. The map display control method according to claim 1, characterized in that the parameters include: a start location, an end location, a set of map element coordinates points, and a parameter spaced from the perimeter.
3. The map display control method according to claim 1, characterized in that the determining whether the parameter of the map display range is valid further comprises:
and if the parameters of the map display range are invalid, adjusting the parameters of the map display range until the parameters of the map display range are valid.
4. The map display control method according to claim 1 or 2, characterized in that the determining whether the number of the geographic elements is greater than a preset value, further comprises:
if the number of the geographic elements is not greater than a preset value, acquiring a range boundary and a map center point of the current map display, and calculating a longitude and latitude difference A between the map center point and an element coordinate point;
calculating a span value according to a display start-stop range provided by the parameters, calculating a latitude and longitude offset value B, and calculating a new map center point according to the map center point, the latitude and longitude difference value A and the offset value B;
and calling a map center point interface of the map SDK, switching the map viewpoint, and adjusting and displaying the map viewpoint as a target range.
5. The map display control method according to claim 2, wherein the parameter of the inter-peripheral space is specifically: the unit of the distance between the display screen and the display screen is screen pixels.
6. The map display control method according to claim 1, wherein the preset value is 1.
7. An intelligent terminal, characterized in that, the intelligent terminal includes: a memory, a processor and a map display control program stored on the memory and executable on the processor, which when executed by the processor, implements the steps of the map display control method as claimed in any one of claims 1 to 6.
8. A storage medium storing a map display control program which, when executed by a processor, implements the steps of the map display control method according to any one of claims 1 to 6.
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| CN105893450A (en) * | 2015-12-31 | 2016-08-24 | 乐卡汽车智能科技（北京）有限公司 | Map displaying method, device and terminal equipment |
| CN105828292A (en) * | 2016-05-09 | 2016-08-03 | 青岛海信移动通信技术股份有限公司 | Position detecting method and device based on geo-fencing |
| CN110362242B (en) * | 2018-04-11 | 2022-05-24 | 腾讯大地通途（北京）科技有限公司 | Map display method and terminal equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110110028A (en) * | 2019-05-09 | 2019-08-09 | 浪潮软件集团有限公司 | A kind of method and system showing map by self defined area towards OGC standard |
| CN110599293A (en) * | 2019-08-20 | 2019-12-20 | 贝壳技术有限公司 | Index information display method and device combined with visual map and storage medium |
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