| In recent years, along with the computer graphics technology matures and the unceasing development, many professional graphics software also comes. Currently in production unit commonly used are AutoCAD, MapGIS and EasyMap etc. But, it is very difficult to decide to choose what software can satisfy the mapping of the working unit. AutoCAD is able to win the masses of users like, The reason is that it has simple operation, powerful and friendly user interface, etc. However, as an excellent comprehensive mapping software, although it can be in all walks of computer aided design plays an irreplaceable role because of its general format, perfect graphics and powerful graphics editing functions. But the users who often use the AutoCAD will find that it cannot be completely meet the needs. It is often things to encounter many repeated use of special symbols in some special industry, but the symbols of the original software providing can't satisfy the requirements. In this case, it is necessary to perform software customization and secondary development according to the actual demand for working. It's not only improves the work efficiency and reduce labor intensity but also can save cost.Map symbol is the indispensable intermediary to transfer the spatial information. It is the important tool to express the spatial distribution of geographical things and help people to cognize and analyze content of the map. Map symbol has the function of cartographic language for the map. Along with rapid development of the computer information and the remote sensing technology, the traditional manual mapping method is no longer adapt to modernization demand and it is being gradually replaced by the new technology of the digital cartography manner. And the map symbol library is an important support parts for the digital mapping software. Therefore, it is particularly important to make the map symbol library.Now we can use a variety of computer language for secondary development of AutoCAD. No matter use which kinds of computer language, the method of the program design and the development idea are invariable. Based on the analysis of the various development language performance, function, development cycle, developing difficulty and the development trend of the future, This paper decide to adopt in the.net (c#) environment for secondary development in AutoCAD, And completed the plane automation mapping symbols library system. The design and implementation of the map symbol library makes full use of the powerful menu-making and slides-making functions of AutoCAD, to create map symbol library dropdown menu and image menu. Through the icon, the operator can identification and choose to use the corresponding symbols. And realize the measurement data rapid transformation into diagram. |
