What is a subfigure, and how can its use make my plot data more efficient?
A subfigure in Gerber plot data is very similar to an AutoCAD BLOCK. Since subfigures and blocks may contain arrayed information, they can be used in 274-X, F9000, and DPF files to keep the plot files much smaller than they would if the hierarchy were flattened or exploded. In 274-X data, the total number of subfigures is limited in practice to 512 placements. (A 5 x 6 step & repeat array generates 30 placements. A step & repeat 5 x 6 array of two layer paint & scratch data generates 60 placements.) For F9000/Autoplot data the limit is about 50,000 placements. There is no such limit for DPF files. 274-X and F9000/Autoplot both allow for only two levels of hierarchy – the top level and one level of subfigures/blocks, whereas DPF accommodates nested blocks. Repeated blocks may be used in all three formats. What information is contained in the ‘mass parameters’ and headers of Gerber 274X, F9000, and DPF files.All three formats include information about the units of the plot data. All thre
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