Device and method for drawing map

Abstract

The invention discloses a device and a method for drawing a map. The device for drawing a graph on a map includes: a map layer for connecting and encapsulating an external map library and providing map data included in the map library, in which the map is displayed according to the map data; a drawing layer independent of the map layer and including a canvas on which a user can draw graphics; anda coordinate converter which is used for realizing conversion from the coordinates of the canvas to the coordinates of the map, so that the graph drawn by the user can be displayed on the map.

Description

technical field [0001] The invention relates to computer graphics processing technology, in particular to a device and method for drawing maps. Background technique [0002] Many computer applications or services are related to maps, such as those provided by Google Inc. (maps service accessible at http: / / maps.google.com). In order to improve these services, there are known technologies to digitize or digitize traditional maps drawn on traditional media such as paper, so that they can be stored in computer-readable storage media and can be accessed by computer processors , analysis and processing. [0003] In some applications, it may be necessary to modify the map data. In the case of a digital map, since the display and update of the map may involve a large number of calculations (for example, a large number of professionals are involved in the modification of the map), if the map needs to be redrawn every time there is a modification, it will be harmful to the system. ...

AI Technical Summary

Problems solved by technology

First, although some map display tools provide web-side drawing methods, the drawing functions they provide are relatively elementary and cannot allow users to customize drawing methods; for example, the map drawing capabilities of the prior art systems are completely limited to the map layer API, however, most existing map layers strictly follow the Geojson specification, and the drawing capabilities provided are relatively simple

Second, in the systems of the prior art, the drawing function also depends on the map layer; since different map libraries usually provide their own unique drawing methods, different map libraries are incompatible, that is, it is impossible to use a map library to provide Draw method applied on top of another map library

Third, because the drawing function in the prior art is implemented on the same layer as the map layer, the drawing efficiency is low, and for complex graphics, the frame drop phenomenon is serious

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