### xinvaders_3d-1.31 README file

    XInvaders 3D v1.31
    ===================
    XInvaders 3D is a vector-graphics Space Invaders clone
    for the X Window System.

    Objective:
    =================
    Clear all the aliens in each level. The UFO yields bonus
    points if hit. A new life will be added every 7500 points.

    Game-over: either if the player has lost all its lives
    or if the alien formation reaches the player position.

    From bottom to top:
    Row 0 aliens yield 10  pts
    Row 1 aliens yield 50  pts
    Row 2 aliens yield 100 pts
    Row 3 aliens yield 150 pts
    Row 4 aliens yield 200 pts

    UFO yields 500 pts

    Keys:
    =====

    SPACE         : Fire Missile
    Left Arrow    : move left
    Right Arrow   : move right
    Up Arrow      : move up
    Down Arrow    : move down
    q             : Reset game
    f             : Show frame-rate
    p             : Pause game
    ESC           : Terminate Program

    How to play the game:
    =====================

    1. Requirements: gcc and Xlib
    2. Compile the game, type: make
    3. Run the game, type: ./xinv3d

    note:
    You may have to edit the Makefile depending on where
    your headers and libraries are.

    Greetings:
    ==========
    Greets & Thanks to following people whose games helped inspire
    this project:

    Bill Kendrick
    who wrote ICBM3d http://www.newbreedsoftware.com

    Yuusuke Hashimoto
    who wrote XSoldier http://www.surfline.ne.jp/hachi/xsoldier.html

    James Eibisch
    who wrote a Space Invaders clone in quick-basic
    http://www.revolver.demon.co.uk/coding/index.html

    Have Fun!
    Don Llopis
    dllopi01@fiu.edu
    http://www.fiu.edu/~dllopi01

    History:
    ========
    1.31:
          Fixed drawing order. Objects were being drawn in reverse.

    1.3:
          Many thanks to Thomas Boutell, he has contributed a
          Windows port of XInvaders 3D. See README.win for more
          information.

          XInvaders 3D DOS port finished. XInvaders 3D will now run
          as a full-screen 640x480x8 DOS game. For windows users it
          will run in a DOS window just fine. I used DJGPP+Allegro
          to port it. See README.dos for more information.

          Added Vector-fonts. All text graphics have been
          replaced with Vector-fonts. Gives the game a
          cleaner look.

          New player blinking routine. Player now cycles
          through red colors, rather than being drawn
          each alternate frame, when a new level
          has been started.

          New special effect: 1-UP indicator. When 7500pts
          have been reached a new life is indicated by
          a nice little vector 1-UP floating towards
          the player.

          New alien-shoot missile routine. Aliens now shoot
          more.

          New Distance-of-Point-to-Line routine, used for
          collision detection.

          Added fix for FreeBSD systems, thanks to Peter da Silva.

          Fixed ZONE_HEIGHT bug in game.c, which was generating
          bad pointers, thanks to Sam Bushell.

          Cleaned up code, for portability reasons, thanks to
          Thomas Boutell for his help.

          Left-Shift key is no longer being used.

    1.2:
          Cleaned up some more code.

          Adjusted formation movement.

          Changed missile color to yellow, suggested by Mattia Engdeg.

          Fixed some warnings which the pedantic flag generates,
          thanks to Jarmo Pussinen for pointing them out.

    1.1:
          Fixed incompatible pointer warnings.

          Fixed window manager bug which Bill Kendrick pointed out.

          Windows were opening at an odd width and height under
          the Enlightenment Window manager.

    1.0:
          Initial release.