home *** CD-ROM | disk | FTP | other *** search
-
-
- World DataBase display routine: Version 2.0
-
- This program is an enhancement on Mike Groshart's routine for displaying
- the CIA database of the geography of the world. The executable file is
- under 11K, and its takes about 137K to execute, including hi-res interlace
- screen and intuition interface.
-
- Changes:
-
- It uses slider gadgets for adjusting the latitude and longitude and
- magnification factors.
- It uses integer arithmetic for scaling, hence faster calcs
- It uses area clipping to avoid spending time plotting with
- off-map points
- It can compensate for monitor "stretch" which for the 1080 requires
- a stretch factor of about 1.2, figured at the equator. I.e.,
- the perceived shape of (e.g.) Africa, with stretch set at 1.20,
- is closer to the shape seen when one looks at a 3-D world globe.
-
- NEW: Once a map is displayed, clicking the LeftMouseButton will readjust
- both the Longitude and Latitude (the center point of the next
- display) to that of the pointer, based on the current display.
- Therefore, it should be done BEFORE making any changes in the
- Magnification factor.
-
-
- NEW: WDB Automatically selects the input file based on the magnification
- factor:
- mag 0.85 - 2.00 --> wdb.5.all 25,890 bytes
- mag 2.00 - 6.00 --> wdb.4.all 82,080 bytes
- mag 6.00 - 12.00 --> wdb.3.all 156,960 bytes
- mag 12.00 - 36.00 --> wdb.2.all 652,428 bytes
- mag 36.00 -125.00 --> wdb.1.all 1,068,408 bytes
-
-
- FILES:
- In this arc are included
-
- the WDB program,
- this readme file,
- wdb.5.all
-
- In another arc <WDBData.arc> are points files
- for higher magnification levels:
- wdb.4.all
- wdb.3.all
-
- The other point files are too large for a BBS to handle
- efficiently. Get them from me or Mike Groshart at an AUoH users
- group meeting.
-
-
- OPERATION:
-
- Call it from CLI: wdb
-
-
- The name of the file being shown appears in the lower right of the
- Control Window. If the automatcally selected file is not available in
- the current directory, the most accurate file (lower numbered file)
- available is used. This means that called from a floppy disk WDB can
- normally access only the 3 smallest files (wdb.5.all to wdb.3.all).
- The file wdb.2.all must be called from its own floppy disk; and
- wdb.1.all must be called either from RAM: or from a hard drive.
-
- Using various files allows for displays of greater magnification
- to maintain a better detail level, without the time penalty of passing
- through the largest file for displays that require lesser detail.
-
- Perhaps someone will have better ideas as to when the different
- files should be called in. Speak up.
-
- If a special "points" file is specified on the command line, this
- will cause WDB to supress the automatic file selection. I.e.,
- "WDB wdb.3.all" will display only points from the file wdb.3.all.
-
-
- Send further suggestions and bugs to be fixed to me.
-
-
- Bob Dufford
- Amiga Users of the Heartland
- P.O.Box 1432, DTS
- Omaha, NE. 68101-1432
-
- Or on Larry's Hot Tub (402) 571-4316 (Fidonet 1:285/15)
-
-