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tech
This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.
Some of these files were originally commercial releases in the 1980s and 1990s, but they are now widely available online. I assume that copyright over them is no longer being asserted. If you own the copyright and would like files to be removed, please contact me.
| Tape/disk: | Home » Personal collection » Acorn hard disk » apps » !DrawPlus |
| Filename: | tech |
| Read OK: | ✔ |
| File size: | 123E bytes |
| Load address: | 0000 |
| Exec address: | 0000 |
Duplicates
There are 4 duplicate copies of this file in the archive:
- Personal collection » Acorn ADFS disks » Archimedes » Dominic_1.ADF » !DrawPlus/tech
- Personal collection » Acorn ADFS disks » Archimedes » Dominic_1B.ADF » !DrawPlus/tech
- Personal collection » Acorn ADFS disks » Greaseweazled » adfs_Dominic_1.adf » !DrawPlus/tech
- Personal collection » Acorn ADFS disks » Greaseweazled » adfs_Dominic_1B.adf » !DrawPlus/tech
- Personal collection » Acorn hard disk » apps » !DrawPlus » tech
File contents
DRAW PLUS TECHNICAL DETAILS
� JJM April 1991
This file gives details of the additional data structures used by
Draw Plus. They are defined in terms of C structures. Details of the
standard types and objects can be found in the include file drawftypes.h
supplied with C release 3. Any future changes to these structures will be
backwards compatible with Draw Plus version 2�00.
Extended object tag
This replaces the 4-byte object tag used in standard Draw objects, and
stores the layer information and miscellaneous flags. The default for the
extended information is all zeros, which means that objects and files
without this information are fully compatible with other applications
which produce or use Draw files.
The extended tag is described by the following structure:
typedef unsigned char draw_tagtyp;
typedef unsigned char draw_layer;
typedef unsigned char draw_objflags;
struct draw_extag /* Extended object tag */
{
draw_tagtyp tag; /* Basic object type */
draw_layer layer; /* Drawing layer, 0 to 31 */
draw_objflags flag; /* Object flags */
unsigned char spare; /* For future expansion */
};
The following bits in flag are used at present:
#define flag_NODISPLAY 1 /* Object is never displayed */
#define flag_LOCKED 2 /* Object is locked */
#define flag_HIDDEN 4 /* Object is temporarily hidden */
The NODISPLAY flag is used to mark objects, such as saved settings, used
internally. The HIDDEN flag marks objects that are temporarily invisible,
such as path objects that are in the process of being edited. The LOCKED
flag is set if the object has been locked.
The extended tag replaces the original draw_tagtyp in the object header,
as follows:
struct draw_objhdr /* General object header */
{
draw_extag t; /* Extended tag */
draw_sizetyp size; /* Object size */
draw_bboxtyp bbox; /* Bounding box */
};
Saved settings
Settings, styles, layer and dash pattern information is saved in a number
of objects which are described by the following structure:
struct draw_setstrhdr /* Saved settings object header */
{
draw_extag t; /* Extended tag */
draw_sizetyp size; /* Object size */
draw_bboxtyp bbox; /* Bounding box */
int version; /* Structure version */
int contents; /* What this contains */
};
The settings structure version field is used to detect incompatible or
out-of-date settings; it is currently 4.
The contents field indicates what is stored in this structure. The types
currently defined are:
#define set_USER 1 /* General user settings */
#define set_TEXTSTYLE 2 /* Default text style */
#define set_PATHSTYLE 3 /* Default path style */
#define set_EXTRAS 4 /* Layers and dash patterns */
#define set_EXPAND 5 /* For future expansion */
The data immediately follows this structure. Since the format and content
is subject to change, details are not included here. The object type for
a saved settings object is 101.
Library file
The library file format is very similar to a standard Draw file. The
header is identical, except that the creator string is "Library" rather
than "Draw". The major version number is 2.
The rest of the file contains standard Draw objects described by the
following structures:
struct draw_libstrhdr /* Library object header */
{
draw_extag tag; /* Object tag */
draw_sizetyp size; /* Size (including contained object) */
draw_bboxtyp bbox; /* Copy of object's bounding box */
char name[21]; /* Object name */
time_t time; /* Time last updated */
};
The included object (with its own tag and bounding box) follows
immediately after the header:
struct draw_libstr /* Library object */
{
draw_extag tag; /* Object tag */
draw_sizetyp size; /* Size (including contained object) */
draw_bboxtyp bbox; /* Copy of object's bounding box */
char name[21]; /* Object name */
time_t time; /* Time last updated */
draw_objhdr object; /* Object data */
};
The type time_t is defined in the header file time.h. The object type for
a library object is 100.
00000000 0a 0a 20 20 20 20 20 20 20 20 20 20 20 20 20 20 |.. |
00000010 20 20 20 20 20 20 20 20 20 44 52 41 57 20 50 4c | DRAW PL|
00000020 55 53 20 54 45 43 48 4e 49 43 41 4c 20 44 45 54 |US TECHNICAL DET|
00000030 41 49 4c 53 0a 0a 20 20 20 20 20 20 20 20 20 20 |AILS.. |
00000040 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | |
00000050 20 20 20 a9 20 4a 4a 4d 20 41 70 72 69 6c 20 31 | . JJM April 1|
00000060 39 39 31 0a 0a 0a 0a 54 68 69 73 20 20 66 69 6c |991....This fil|
00000070 65 20 20 67 69 76 65 73 20 20 64 65 74 61 69 6c |e gives detail|
00000080 73 20 20 6f 66 20 74 68 65 20 20 61 64 64 69 74 |s of the addit|
00000090 69 6f 6e 61 6c 20 20 64 61 74 61 20 20 73 74 72 |ional data str|
000000a0 75 63 74 75 72 65 73 20 20 75 73 65 64 20 20 62 |uctures used b|
000000b0 79 20 0a 44 72 61 77 20 50 6c 75 73 2e 20 20 20 |y .Draw Plus. |
000000c0 54 68 65 79 20 20 61 72 65 20 64 65 66 69 6e 65 |They are define|
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00000da0 73 74 72 69 6e 67 20 69 73 20 22 4c 69 62 72 61 |string is "Libra|
00000db0 72 79 22 20 20 72 61 74 68 65 72 20 0a 74 68 61 |ry" rather .tha|
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