Cody Boone Ferguson
7a6edcda5e
With the exception of 1992/nathan/index.html the entries of 1992 should
all be okay. The reason nathan cannot be done yet is some things have to
be decided first.
This commit fixes:
1992/marangon/index.html
1992/vern/index.html
1992/westley/index.html
236 lines
6.8 KiB
Markdown
236 lines
6.8 KiB
Markdown
## To build:
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``` <!---sh-->
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make all
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```
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There are two alternate versions that relate to the US specifically. See
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[Alternate code](#alternate-code) below.
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### Bugs and (Mis)features:
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The current status of this entry is:
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> **STATUS: INABIAF - please DO NOT fix**
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For more detailed information see [1992/westley in bugs.html](../../bugs.html#1992_westley).
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## To use:
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If lost:
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``` <!---sh-->
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./whereami.sh lat long
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```
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Where `lat` and `long` correspond to your latitude and longitude.
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**NOTE**: you **MUST** have a terminal that is **at least 80 columns** for this
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to show properly. The `whereami.sh` and `whereami.alt.sh` scripts check this.
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## Try:
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``` <!---sh-->
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./try.sh
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```
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## Alternate code:
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The author provided a version for the US which we added in two files: the first
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one is fixed to work for clang; the second one is more for show than for use: if
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you have your terminal set at 80 columns you will see that the source code
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documents itself. The author explains this but what is meant is it will look
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like:
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> main(l,a,n,d)...<br>
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> [A M E R I C A]...
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That version, which will not compile with `clang`, is the second alternate
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version, [westley.alt2.c](%%REPO_URL%%/1992/westley/westley.alt2.c).
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### Alternate build:
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``` <!---sh-->
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make alt
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```
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If you have `gcc` you can also compile the second alternate version, though it
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is functionally equivalent to the first. The original limitation where one has
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to have a terminal that wraps at 80 columns is unfortunately in this version
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because it requires a specific length so if you do not have this it will not
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look right; use the first alternate version if you want to see correct output
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with wider terminals. To compile the second alternate version:
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``` <!---sh-->
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make alt2
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```
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### Alternate use:
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``` <!---sh-->
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./whereami.alt.sh lat long
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```
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**NOTE**: this alternative version also needs a terminal with **at least 80
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columns**.
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### Alternate try:
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The [try.sh](%%REPO_URL%%/1992/westley/try.sh) script uses both the original
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entry and the alternate code so one can try the same script for both:
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``` <!---sh-->
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./try.sh
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```
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## Judges' remarks:
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Use `-` (negative number) for the south of the equator and/or west of the
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meridian.
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To find the approximate place where this entry was judged:
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``` <!---sh-->
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# If you have at least 80 columns:
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./whereami.sh 37 -122
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# If you don't have at least 80 columns, try:
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./whereami 37 -122
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```
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If you wish to see this on the US map:
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``` <!---sh-->
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# Make sure the alt version is built:
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make alt
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# If you have at least 80 columns:
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./whereami.alt.sh 37 -122
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# If you don't have at least 80 columns, try:
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./whereami.alt 37 -122
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```
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## Author's remarks:
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Run the program with your latitude & longitude as integer
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arguments; it will produce a map made up of `'!'` with the given
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position marked with either a `'"'` (if the position is over a `'!'`)
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or a `#` (if the position is over a space). Southern latitudes
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and western longitudes are entered as negative numbers. For
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example, to find San Francisco, run with `./whereami 38 -122`. The
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resolution of the map is five degrees horizontally, ten degrees
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vertically. The map is a Mercator projection with equal spacing
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of the latitudes, so the areas near the poles are very distorted.
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Latitudes near the poles and Antarctica are not shown.
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The program requires the ASCII character set, `putchar(3)`, `atoi(3)`,
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and a display that auto-wraps at 80 characters(!). If your display
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does not work this way, you will have to massage the output;
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for example, you can redirect it to a file and edit it with vi,
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which will do auto-wrap for you.
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Lint complains that `main()` returns a random value and I'm not
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checking the value that `putchar(3)` returns. Scandalous!
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If you run it with fewer than 2 arguments, it will likely
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give you an exception, as it will access arguments that
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don't exist and characters before a string constant.
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### How it works:
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The map is printed as one long string of `' '` and `'!'` characters,
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with the auto-wrap used to stack up slices of 80. The map data is
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a string; the first character is how many `!`s are printed
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(`'A'`=1, `'B'`=2, etc), the second character is how many `' '`s, the
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third is how many `!`s, etc. ASCII characters less than `'A'`
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print no characters but still change the polarity, so any map
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of `' '`s and `'!'`s is possible. This is done in the `putchar(3)`
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argument as `33^l&1`, where `l` is the character `position+4`; if
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`l` is odd, `' '` is printed, if `l` is even, `'!'` is printed.
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The position of latitude & longitude is changed into a single
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character position within the one long string via the first
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expression `d = latitude/10*80 - longitude/5 - offset`. The
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latitude is divided by ten because the vertical resolution is
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ten degrees, then multiplied by 80 because of the 80 character
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wrap (i.e. each ten degrees moves the position up or down one
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entire row). The longitude is divided by five and added, because
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five degrees of change moves the location one character. The signs
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are opposite because latitude is decreasing and longitude is
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increasing as you go from upper left to lower right. The offset
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is where the origin (latitude=0, longitude=0) is found.
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The position counting down to zero changes the `putchar(3)` from
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printing (`'!'` or `' '`) to printing (`'"'` or `'#'`).
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The `"H E L L O, W O R L D!"` string inside the data string
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prints the line of blanks past [Tierra del
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Fuego](https://en.wikipedia.org/wiki/Tierra_del_Fuego) and the last
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blank line. It's just for show, really.
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Since the resolution is coarse, a few coastal cities are shown to
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be just off the map; this is an unavoidable artifact. The map
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is reasonably accurate.
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### Here are some cities you might like to try:
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```
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New York 41 -74
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London 52 0
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Moscow 56 38
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New Delhi 29 77
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Sydney -34 151
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Los Angeles 34 -118
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Paris 45 2
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Rio de Janeiro -23 -43
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Beijing 40 116
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Tokyo 36 140
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```
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For a domestic (US) version with higher resolution, try:
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``` <!---c-->
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main(l,a,n,d)char**a;{for(d=atoi(a[1])/2*80-atoi(a[2])-2043;
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n="bnaBCOCXdBBHGYdAP[A M E R I C A].AqandkmavX|ELC}BOCd"
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[l++-3];)for(;n-->64;)putchar(!d+++33^l&1);}
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```
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The code will test the 80-column wrap and document itself if it is
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joined together as one 160-character line and listed. You should see:
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``` <!---c-->
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main(l,a,n,d)...
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[A M E R I C A]...
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```
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...going down the left edge if your terminal auto-wraps at 80 characters.
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<!--
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Copyright © 1984-2024 by Landon Curt Noll. All Rights Reserved.
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You are free to share and adapt this file under the terms of this license:
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Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
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For more information, see:
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https://creativecommons.org/licenses/by-sa/4.0/
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-->
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