Electronic map control device and electronic map control method

Abstract

The invention discloses an electronic map controller and an electronic map control method, wherein the method includes the following steps: when an instruction of zooming in a map is received, a zoomed target display level is determined, and a plurality of target tiles to be displayed in the target display level are found out; on the basis of the relation between the current display level and the target display level, a preloaded display level is selected, and preloaded tiles in the preloaded display level, which correspond to the target tiles, are found out; the preloaded tiles and the target tiles are obtained according to priorities, and the preloaded tiles are loaded, zoomed in and displayed according to the level difference between the preloaded display level and the target display level; after being obtained, the target tiles are loaded and displayed to replace the zoomed preloaded tiles at corresponding positions. The time needed by the downloading of the preloaded tiles from a server and the loading of the preloaded tiles is shorter than the time needed by the downloading of the target tiles from the server and the loading of the target tiles, and the probability of the existence of blanks in an electronic map window is decreased when the map is zoomed in.

Description

technical field [0001] The invention relates to the technical field of electronic maps, in particular to an electronic map control device and an electronic map control method. Background technique [0002] At present, the electronic map client is zooming in on the map according to the user's command to zoom in on the map (see Baidu map, Tencent map and other electronic map network clients, click the zoom button, that is, the "+" button, and it can be known that the enlarged map in the field of electronic map technology is represented by When the geographic range displayed in the same electronic map display range is small and the geographic details are more detailed), it is necessary to load lower-level tiles 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 zooming in on the electronic map, some tiles cannot be displayed in time because it takes more time, and ther...

AI Technical Summary

Problems solved by technology

[0002] At present, the electronic map client is zooming in on the map according to the user's command to zoom in on the map (see Baidu map, Tencent map and other electronic map network clients, click the zoom button, that is, the "+" button, and it can be known that the enlarged map in the field of electronic map technology is represented by When the geographic range displayed in the same electronic map display range is small and the geographic details are more detailed), it is necessary to load lower-level tiles 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 zooming in on 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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