OakPDT Drawing

File Format
Name	OakPDT Drawing
Ontology	Electronic File Formats 3D and CAD/CAM Models OakPDT Drawing ; ; ;

Revision as of 11:18, 11 October 2022

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").

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

@@ Line 45: / Line 45: @@
 |-
 | || Struct || Error information
+|-
+| || Struct || Layer information
+|-
+| || Double || Dimension scale
+|-
+| || Integer || Number of functions (<code>n</code>)
+|-
+| || Array || <code>n</code> function table entries
 |-
 ! colspan="3" | Symbol table entry
@@ Line 133: / Line 141: @@
 |-
 | 4 || Null-terminated string ||
+|-
+! colspan="3" | Layer information
+|-
+| 0 || Array || 64 bytes
+|-
+| 64 || Array || 64 bytes
+|-
+| 128 || Byte ||
+|-
+| 129 || Byte ||
+|-
+| 130 || Byte ||
+|-
+| 131 || Array || 10 bytes
+|-
+! colspan="3" | Function table entry
+|-
+| 0 || Null-terminated string||
+|-
+| || Integer ||
+|-
+| || Integer ||
 |-
 |}