49
INcluding the 8−byte header
4 bytes Record ID (for future unique manipulation of this record)
7.2.2. Supported Record Types
TIMESTAMP (type 5):
Specifies an "end−of−validity" for all the records that follow it (i.e. until the next
timestamp record)
8 BYTES HEADER
4 bytes End−of−validity timestamp
4 bytes Number of bytes (EXcluding this record itself) that can be
skipped immediately when end−of−validity is in the past
(note: this value can be set to 0 if you’re lazy)
NOTE: Records NOT preceded by an end−of−validity are "permanently valid." Even so, it is highly
recommended that you consider the issue of validity periods, and always make sure that the very first
record of the file specifies the end−of−validity for the whole file.
SKIPPER (type 6):
Specifies that the coming X bytes relate to a certain rectangle
8 BYTES HEADER
16 bytes Normalized coordinate rectangle of the area
4 bytes Number of bytes (EXcluding this record itself) that can be
skipped if rectangle doesn’t overlap the current screen
NOTE: It is highly recommended, in the interest of processing speed, that you always provide a skipper
record that specifies the surrounding−rectangle for all the rectangle−dependent records in the whole file
together.
IGNORE (type 0):
Records with type 0 are completely ignored by the application.
8 BYTES HEADER
X bytes Ignored content
NOTE: Uses of this type of record range from permanent deletion (rather than de−activation) of records
to watermarking copyright information into your files. However, please be aware that these records still
consume memory, and also cost a (very small) amount of time to ignore.
LINE (type 1):
8 BYTES HEADER
8 bytes Start coordinates of the line
8 bytes End coordinates of the line
4 bytes Line type (0=default)
4 bytes Red/Green/Blue color code of line
NOTE: The line type is the combination of a line thickness and a line pattern. The line thickness codes
are:
•
0 − width of motorway 2
•
1 − width of motorway 1
•
2 − width of major road 4
•
3 − width of major road 2
•
4 − width of major road 1
•
5 − width of secondary road 4
•
6 − width of secondary road 2
•
7 − width of secondary road 1
•
8 − width of local road 4
•
9 − width of local road 3
7. Graphic Information Files
