A device and corresponding method for controlling zooming of electronic map
A technology for map zooming and electronic control, applied in program control devices, 2D image generation, image data processing, etc., can solve the problems of large map range, inability to display tiles in time, rough geographical details, etc., to reduce the probability of blank Effect
Active Publication Date: 2016-08-17
BEIJING QIHOO TECH CO LTD
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[0002] At present, the electronic map client is zooming out the map according to the user's command to zoom out the map (see Baidu map, Tencent map and other electronic map network clients, click the zoom out button, that is, the "-" button, it can be seen that the zoomed out map in the field of electronic map technology is expressed in When the map displayed in the same electronic map display range has a large range and the geographic details are coarser), it is necessary to load higher-level tiles that are different from the current display level, because it is necessary to request tiles from the server and perform image rendering on the tiles, etc. Therefore, when shrinking the electronic map, some tiles cannot be displayed in time because it takes more time, and there will be blank spaces in the electronic map window; when the network performance is poor, the electronic map blanks are more obvious
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[0030] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.
[0031]The technical idea of the present invention is mainly to determine the target display level and the preload display level when receiving the command to zoom out the map, and find out the target tile to be displayed and the edge area in the preload display level (periphery of the currently displayed tile). Newly added map range) preloaded tiles to be loaded. Since the number of preloaded tiles is less than the number of corr...
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The invention discloses a device and a corresponding method for controlling electronic map zooming. The method comprises the following steps of: when a command for enlarging a map is received, determining a target display level to which the map needs to be enlarged, and looking up a plurality of target tiles which need to be displayed at the target display level, wherein the target display level is higher than the current display level; according to the level difference between the current display level and the target display level, loading and zooming out to display the tile which is displayed at present; selecting a preloading display level, and looking up a preloading tile which needs to be loaded in an edge area at the preloading display level; according to the priority, obtaining the preloading tile and the target tile; according to the level difference between the preloading display level and the target display level, loading and zooming in to display the preloading tile; when the target tile is obtained, loading and displaying the target tile to replace the enlarged preloading tile on the corresponding position.
Description
technical field [0001] The invention relates to the technical field of electronic maps, in particular to a device and a method for controlling zooming of electronic maps. Background technique [0002] At present, the electronic map client is zooming out the map according to the user's command to zoom out the map (see Baidu map, Tencent map and other electronic map network clients, click the zoom out button, that is, the "-" button, it can be seen that the zoomed out map in the field of electronic map technology is expressed in When the map displayed in the same electronic map display range has a large range and the geographic details are coarser), it is necessary to load higher-level tiles that are different from the current display level, because it is necessary to request tiles from the server and perform image rendering on the tiles, etc. Therefore, when the electronic map is zoomed out, some tiles cannot be displayed in time because it takes more time, and there will be ...
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IPC IPC(8): G06T11/00G06T3/40G06F9/445
CPCG06F16/29
Inventor 杨新明
Owner BEIJING QIHOO TECH CO LTD