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This article mainly explains "Qt how to write map service". The content of the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "Qt how to write map service".

I. Preface

There are basically five domestic map service manufacturers, Baidu Maps, Amap, Tencent Map, Sogou Maps, Sky Maps, and generally Google Maps and Microsoft Maps (BING Maps) abroad. The api interfaces of these mapping services are more or less the same, and even the names of many functions are exactly the same. after all, it is very popular, so it is easy to understand, except for the different JS files introduced into the mapping service. Object names are different, and most of the others are similar, which gives programmers a convenient and unified way of thinking, and the overall process is as follows:

Register the key corresponding to the account application

The secret key can choose the corresponding available features.

Introduce the map JS file, a fixed address with the version and key

Set a div layer object in the body of the web page to store the map

New the map object and set the properties of the map

Setting properties can be either a calling method or a format placement directly similar to json data

Customize the JS function to set other functions to interact with the interface

II. Functional features

Both online map and offline map modes are supported.

Support webkit kernel, webengine kernel and IE kernel at the same time.

Multiple dimension points can be set, including name, address, longitude and latitude.

You can set whether the map can be clicked, dragged, or scrolled.

You can set the protocol version, secret key, theme style, central coordinates, central city, geocoding location, and so on.

Can set the map zoom scale and level, thumbnails, scale, road information and other controls visible.

Support map interaction, such as mouse press to get the latitude and longitude of the corresponding location.

Support to query the route, you can set the starting point, end point, route mode, route mode, route scheme (minimum time, least transfer, least walk, do not take the subway, shortest distance, avoid highway).

Can display dots, lines and surfaces tools, and can draw lines, points, rectangles, circles and so on directly on the map.

Administrative divisions can be set up, a certain urban area drawing layer can be specified, and the online map automatically outputs the administrative division boundary points to the js file for offline map use.

Multiple coverings can be added statically or dynamically. Support points, broken lines, polygons, rectangles, circles, arcs, point aggregations, etc.

The function interface is friendly and unified, and it is easy to use, just one class.

Support js dynamic interaction to add points, delete points, clear points, reset points, no need to refresh the page.

Support any Qt version, any system, any compiler.

Third, effect picture

4. The related code void MapGaoDe::addProperty (QStringList & list) {if (mapType = = 0) {/ / defines the map object list

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