Cody Boone Ferguson
ba0f9343e1
There is one thing brought up on GitHub that might necessitate a minor change but that can happen later.
184 lines
4.3 KiB
Markdown
184 lines
4.3 KiB
Markdown
## To build:
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``` <!---sh-->
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make
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```
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**NOTE**: this entry requires the `X11/Xlib.h` header file and the X11 library to
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compile. For more information see the
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FAQ on "[X11](../../faq.html#X11)".
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## To use:
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``` <!---sh-->
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./vik1 [arg]
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```
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## Try:
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``` <!---sh-->
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./vik1
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./vik1 a
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./vik1 d2
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./vik1 ad3
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```
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Can you figure out how to cheat?
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Also see the author's remarks below for more details on the different
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modes/options.
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## Judges' remarks:
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Daniel Vik has presented a tour de force feature rich X11-based
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racing game that fit within the contest size limits. Take a
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glance at the feature list he provided below. Amazing!
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The author posted a video of this on YouTube:
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<https://www.youtube.com/watch?v=xTseqWCtAUA>.
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Happy touring on the road and in the code!
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## Author's remarks:
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### Features
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This program is a complete car race game with a lot of nice features:
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* Drive on a road in a 3D landscape with hills and curves.
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* Mountains in the horizon.
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* A sun in the sky when driving during the day.
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* Dark sky and reduced visibility when driving at night.
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* Snow when driving in the winter.
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* Slippery road when driving in the winter.
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* When driving off the road, the car slows down to a halt.
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* Three different race tracks that takes about one minute to complete.
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* Speedometer.
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* Computer driven opponent cars.
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* Collision detection when driving into other cars.
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* Lap time measurement.
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* The best lap time is stored as reference.
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### Build and Run
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Compile the source code and link X libraries if necessary.
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The program takes three options which have to be typed in a specific
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order as described below.
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#### Usage:
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``` <!---sh-->
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./vik1 ['a']['d'][#]
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```
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- `a`
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* Advanced racing in a winter landscape.
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- `d`
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* Racing in at night in the dark.
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- `#`
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* Race track selection 1-3 are valid numbers.
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#### Examples:
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- `./vik1`
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* Run track 1 at daytime in the summer.
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- `./vik1 a`
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* Run track 1 at daytime in the winter.
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- `./vik1 d`
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* Run track 1 at night in the summer.
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- `./vik1 3`
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* Run track 3 at daytime in the summer.
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- `./vik1 d3`
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* Run track 3 at night in the summer.
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- `./vik1 ad2`
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* Run track 2 at night in the winter.
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Note that the order in which the argument characters are entered is
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important. It is for example not possible to type `./vik1 da`. (Well it is
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possible, but the result will not be as expected.)
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The space key accelerates the car. Releasing the space key slowly
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reduces the speed. The left and right arrow keys are used to steer the
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car.
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### Obfuscation
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The main obfuscation is the fact that the program is extremely compact.
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There are a few things I didn't want to do, e.g. define `#define` to a
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single letter to save some space, or to remove casts to save some space.
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The program uses a lot of variables. In fact, all letters `a-z` are used
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and most letters `A-Z`.
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The constants are chosen very carefully and they have multiple purposes,
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e.g. a constant can be both the length of the track and a color.
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Most of the code is kept inside five `for` loops each without a body. Each `for`
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loop does many things. One `for` loop draws all cars by restarting a
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couple of times. Another draws the road, mountains, and the sun.
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`main()` is called recursively. The return value and output depends on the
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arguments. `main()` can return the current time, draw lines and of course be
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the entry point of the application.
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The program frequently uses the `?:` operator mainly to save space but it
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makes the program more obscure.
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### Compiler warnings
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There are no compiler warnings when compiling with `-ansi` but there are
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many warnings from lclint, mainly because the program is very
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optimized for code size.
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### Limitations
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The program only compiles and runs on X based systems.
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The program requires a display with 24 bit color depth. It also assumes
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that the byte order of the colors are as on my Linux PC. That is, The
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colors are represented by a 32 bit value where the bytes (from high to
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low) are `{ 0, RED, GREEN, BLUE }`.
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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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