We can infer that ZWCAD is saving the data in a very similar way to AutoCAD.ĭWF – File Sizes As with DWG, comparison of the DWF file sizes created by both AutoCAD and ZWCAD can be revealing. It's reasonable to have some degree of variance though, and I'd say this is well within what I'd call acceptable. ZWCAD gets pretty close to the file size AutoCAD creates, but it is not a 100% match. Below is another table showing the file sizes of the same four files, when saved by AutoCAD vs. ZWCAD matches AutoCAD exactly, which is a pretty good start.Īnother way to see if AutoCAD and ZWCAD are doing different things with the file format is to compare file sizes.
While this is at its core a very basic test, we are indirectly testing quite a wide range of features, and it is a good way to establish compatibility of many of the fundamentals in one simple process. Below I have created a table showing the entity types and count of each.
Therefore my first test is to open up a range of drawings, and simply perform a count of the various entity types that my test drawings contain.I have four drawings, each of which contains various types of entities. If it is structured in a way that the software does not understand, it might result in entities being omitted, or converted to other more generic types. The software needs to be written in such a way that it can cope with and understand all the possible varying ways in which the DWG file can validly be structured. With my software developer hat on, I know that reading data from a file format such as DWG is fraught with obstacles. The first and most obvious thing for me to check is that DWG files opened in ZWCAD contain the same basic list of entities that are contained within AutoCAD. With the origins of DWG and DWF file formats firmly rooted with the Autodesk AutoCAD product, this is what will be used as the benchmark for what is expected from DWG and DWF files. When talking about file format compatibility, it is important to note and understand exactly what ZWCAD is trying being compatible with.
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