OakPDT Drawing

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File Format
Name OakPDT Drawing
Ontology

Overview

OakPDT is a 2D parametric CAD system for RISC OS. On RISC OS systems, files in this format typically have a filetype of CAD ("PDT Dwg").

Format details

File Header
0 Byte Major version number of the file format (always 1)
1 Byte Minor version number of the format
  • 2 corresponds to OakPDT v2.50 (17 November 1990)
2 Null-terminated string The_Design_System or Oak_P_D_T_Drawing
20 Integer Number of symbols (s)
24 Array s symbol table entries
Integer Size of drawing definition (v)
Array v bytes
Byte Paper size
Struct Window definition
Struct Grid information
Struct Text information
Struct Dimension information
Struct Line style information
Integer Number of scalars (n)
Array n scalar table entries
Struct Error information
Struct Layer information
Double Dimension scale
Integer Number of functions (n)
Array n function table entries
Symbol table entry
0 Byte
1 Byte
2 Byte
3 Byte
4 Integer
8 Integer
Window definition
0 Double
8 Double
16 Double
24 Double
Grid information
0 Double
8 Double
16 Double
24 Double
32 Integer
36 Integer
Text information
0 Double
8 Double
16 Double
24 Integer
Dimension information
0 Double
8 Double
16 Double
24 Double
32 Integer
36 Integer
40 Integer
44 Integer
Line style information
0 Integer
4 Integer
8 Integer
12 Integer
Scalar table entry
0 Integer
4 Null-terminated string
Error information
0 Integer
4 Null-terminated string
Layer information
0 Array 64 bytes
64 Array 64 bytes
128 Byte
129 Byte
130 Byte
131 Array 10 bytes
Function table entry
0 Null-terminated string
Integer
Integer
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