Shulou(Shulou.com)06/03 Report--

The scheme selection process of the auxiliary drawing tool is complicated, and it has been called initially since the end of August last year, and has hit a brick wall, and finally got the basic scheme.

First of all, let's say something beside the point: why do you need auxiliary graphic design? Where does the huge amount of overtime come from?

At present, the unit's main business is the subway signal system engineering general contract, including subway new construction and reconstruction project management, system design, product research and development, system integration, test verification and other solutions and services. The future integration scheme is planned for the center, the ground and the vehicle. No matter which subsystem inevitably needs the design and drawing work, the metadata of each subsystem is generated by the drawing, and the data configuration of the code is carried out according to these metadata. Different cities and different lines carry out different design drawings, data generation, data configuration and so on, so you can imagine the workload inside. However, this overtime does not create new value or bring new profits.

If enterprises want to survive better in the future, they must win more profits and less overtime costs. Such a good auxiliary drawing tool design, the need for an excellent data configuration design is very strong. Develop more useful design and drawing software, and the operating software can get the results as soon as the demand changes.

How to design the auxiliary drawing assistant data configuration tool?

The key of auxiliary drawing is to design the mapping relationship between data and elements, so this direction is the core demand in the scheme research. The final solution tends to be the secondary development based on objectArx.

Based on the secondary development of objectArx, this class library is a C# special class library. ObjectARX directly accesses the database structure, graphics system and AutoCAD geometry core of AutoCAD, so it can expand the function of CAD in real time and reuse the inherent commands of CAD to develop new commands. The core of CaD database is that BlockTable,BlockTable and all Block have an one-to-one mapping relationship. BlockTable this table contains two very important records: model space and paper space, and all entities (visible objects) are placed in the block table AcDbBlockTable.

Other design schemes do not have such a complete data-element mapping relationship, so they do not have inherent advantages in generating data and reverse generation of elements.

Autolisp and VBA are the initial secondary development solutions, which are gradually eliminated because they do not have complete object-oriented features.

The development of C++ language based on SDK class library has not entered the mainstream program, which may be due to the compatibility of the two. Although C++ is more powerful in object-oriented, it is inefficient in controlling all kinds of blocktable with ObjecArx, so it has not entered the mainstream until now.

Other drawing tools, only drawing tools, reverse generation of elements can not be said to be not feasible, but the loss outweighs the need for a lot of graphic design and data design work.

ObjectArx can directly access the graphic database BLockTable of CAD, which makes the strong mapping relationship between BlockTable and Block can be obtained through the secondary development of ObjectARX class library, which meets the needs of auxiliary drawing tools.

A CAD graph is a database with multiple tables, which specifies nine symbol tables, as follows:

On the other hand, there are very few learning materials about ObjectARX online, which is a very difficult challenge to learn, but as long as the kung fu is deep, the iron pestle is ground into a needle.

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.