Tailor Made Software, Ltd. - The CAD Data Experts
CAD drawings are rarely optimal ‘straight out of the box’ to display on a website or in a document. At a minimum they usually need to be ‘decluttered’ and, of course, converted to a format for use online.
Tailor Made Software, Ltd. products in addtion to decluttering also have the ability to automatically process areas (usually rooms) and area names (usually room ids) and match them to produce clickable areas.
Tailor Made Software’s AutoXChange program will convert AutoCAD DWG (Drawing) and DXF (Data eXchange Format), Microstation DGN (Design), Adobe PDF (Portable Document Format) and Autodesk DWF (Drawing Web Format) to SVG, PDF and a wide variety of raster formats including JPEG, GIF, PNG, TIFF, CALS and many others. It runs on both Windows and Linux systems.
Decluttering (removing graphics from the display so the file is smaller and only that which needs to be displayed actually is displayed) an AutoCAD file can take many forms. We will concentrate on two:
1) Turning AutoCAD layers off
2) Removing AutoCAD blocks
And we will concentrate on the parameter supports provided by AutoXchange AX2022 for this task.
There are four parameters that can be used to change the visibility of layers. They fall into three groups, each of which are mutually exclusive.
2) Off Layers
3) On Layers
PartOn and PartOff will turn the listed layers On or Off, respectively. The remaining layers will be unchanged.
PartOn an PartOff can both be used, but may not be used in conjunction with Off Layers or On Layers.
Off Layers will turn the listed layers Off, and will turn all other layers On. Off Layers may not be used in conjunction with On Layers, PartOn or PartOff.
On Layers will turn the listed layers On, and will turn all other layers Off. On Layers may not be used in conjunction with Off Layers, PartOn or PartOff.
When a layer is invisible it will be dropped from the conversion and will not be defined in the output file.
Because AutoCAD Blocks tend to be placed on the special layer, 0, decluttering by simply turning layers off is not always sufficient. The Ignore Blocks (IB, BO, IGNORE_BLOCK[S]) parameter allows you to turn off processing of individual types of blocks. Block Names are separated by a semi-colon.
You can download a sample drawing hq17_w_furniture.dwg. For test processing, use the parameter
AutoXChange AX2022 Linkage Interface has the ability to automatically match certain area outlines and area names to create clickable areas on the SVG drawing. PDF has no direct equivalent. The same effect can be created in raster drawings via hotspot creation, where an external file is created with some sort of clickable region in raster coordinates. Many different methods of raster hotspots are possible.
Area/Name Matching relies on the drawing having the areas defined by closed polygons. Any of the three types of polylines (2D Polyline, Lightweight Polyline and 3D Polyline) can be used to define the closed polygons.
There are three modes of Matching:
1) Room Layer/Text Layer
2) Room Layer/Handle
3) Block Area/Name
Many AutoCAD drawings, particularly those used for Facilities Management, will have close polygons defining the areas (usually rooms) on the drawing. This is called ‘polyganizing’ the drawing. These space polygons can be used to create automatic links from the drawing to an external data source such as a program or a database management system.
If the drawing has a room name or number, either as text on a given layer or as a block attribute with a given attribute tag (name), then the link can be established using the room number as the link key.
The Room Layer and Text Layer have to be defined using the -RL and -TL parameters, respectively. Text Layer processing works with either Simple Text or MText. Block Attributes can be used by defined the Attribute Tag using the -TAG parameter.
-RL=A-AREA -TL=A-IDEN -TAG=ATTRNAME
This example is the basis of our automatic data linkage processing. The drawing has been setup for normal Archibus Facilities Management usage, where areas (rooms in this case) are defined on Layer RM$ and room names are defined on Layer RM$TXT. This is very standard for use with CAFM systems.
No actual links or clickable areas are defined, so we add them automatically. The following command line is used to process the file.
-i='hq17.dwg' -f=svg -RL=RM$ -TL=RM$TXT
If the drawing has been polygonized as described above, but there are no room names or numbers (granted a minority of drawings), then the AutoCAD Handle can be used as the key. The Handle is a unique 16 digit hexidecimal identifier for every AutoCAD entity that does not change over the life of the drawing. The Handle is never reused even if the entity that used it is deleted.
For Room Layer/Handle processing, each closed polygon on the given (by -RL) layer is click-enabled using the handle of said polygon as the key. It is then up to the external datasource to have the polygon handles as the key to their data.
Block Area processing is mainly designed for use with mechanical parts, but can also be used with architectural drawings. Each Block Reference for the given Block Name has its extents calculated and an enclosing polygon added to the drawing with the Block Reference’s Handle as the key. In this manner it is easy to provide highlights of items like sinks, desks, etc or links to subparts of mechanical assemblies.
In this example a building has chairs defined in cubicals, among other equipment elsewhere. The chairs has data attributes assigned including an identifier named ‘ID’. This id will provide the link to the external datasource. We will convert each block instance to a SVG group with the geometry followed by an enclosing polygon. The polygon will have a specially defined attribute value for the ID.
The name of the block for the chairs is ‘SZT-ARM-2D’ and the name of the attribute tag is ‘ID’. The command line would be:
-i='hq17_w_attr.dwg' -svg -blockname='szt-arm-2d' -tltag=ID
When the SVG is brought into CADViewer it is now clickable and supports tooltips on hover. This functionality relies on custom extensions that are supported by AutoXChange and CADViewer and are therefore not displayed in normal browser-based SVG viewing.
AutoXChange is a command-line driven program where parameters are passed to control the conversion. The full technical documentation is available online.
In its simplest form two parameters are required: the input file and the output format. For instance:
ax2022 inputfile.dwg -svg
The first parameter will be used as the input filename if it does not start with a dash. Otherwise you can use -i to define the input filename. So the following is perfectly fine:
ax2022 -svg -i=inputfile.dwg
The output file name will default to the input filename with the extension changed to reflect the output format. For instance, converting to SVG will result in a default output filename of
inputfile.svg. The output filename can be defined using the second parameter (if there is no dash) or -o.
ax2022 inputfile.dwg outputfile.svg -svg ax2022 -i=inputfile.dwg -o=outputfile.svg -svg
Some AutoXchange 2022 parameters require additional information (such as the filenames above) while some are just switches and do not need additional information. If a parameter does require more information than the parameter name is followed by an equal sign and then the information. For instance, to set the Minimum Line Width you could use -lwmin=0.01, where the command is lwmin and the value is 0.01.
Tailor Made Software has a solid base of satisfied customers in a very diverse set of industries.
They all have in common the need to integrate into their business processes, either advanced file conversion and data extraction solutions or visualization and collaboration tools for CAD data.
"Our unsurpassed knowledge of CAD formats ensures you the highest quality conversion possible, knowing what works and what doesn’t work in CAD conversion."
Scott Taylor - Principal Tailor Made Software - US
"We strive for the highest level of format fidelity possible. CADViewer was the first and is the best CAD viewer and mark-up application on the market."
Casper Harnung - Principal Tailor Made Software - EU