NAME¶
xscorch - Annihilate enemy tanks using overpowered guns.
SYNOPSIS¶
xscorch
xscorch [options]
xscorch --help
DESCRIPTION¶
Xscorch is a clone of the classic DOS game, "Scorched Earth". The
basic goal is to annihilate enemy tanks using overpowered guns :). Basically,
you buy weapons, you target the enemy by adjusting the angle of your turret
and firing power, and you hope to destroy their tank before they destroy
yours.
GAMEPLAY¶
First, fiddle with the options in the main menu. There are a number of options
which are described below, which may make the game easier or harder. The
default options make for a reasonable level of gameplay. Most of the game
configuration is controlled from the user interface, although there are a few
command-line options which are mentioned below. Once you are ready to begin a
new game, you might want to
Save Options to save your configuration,
then select
Begin Game to start a new game.
Gameplay is divided up into several rounds. Each round consists of two parts:
the
Inventory phase and the
Battle phase. In the Inventory
phase, you can buy weapons to shoot at your opponents, and accessories to help
defend your tank. See the Inventory section below for information on the
weapons and accessories you may buy. In the Battle phase, you setup defenses,
choose a weapon, aim and fire at your opponents. See the section on Battle
below, for more information.
INVENTORY¶
The player has the option to buy weapons and accessories to make the game more
interesting. Weapons are just that: an assortment of missiles, including
ICBM-like warheads, napalm, lasers, and a number of custom weapons to bring
down specific defenses. Accessories are methods to make gameplay easier for
the player and increase their chance of survival, with guidance systems,
shields, fuel, batteries, and other odds-and-ends.
At the beginning of a round, each player is given an opportunity to buy or sell
weapons and accessories. Each player may have up to 99 of any item in their
inventory. A few weapons have an infinite supply (for example, Baby Missiles)
- these weapons cannot be purchased.
Weapons and accessories are sold in bundles; the price for the bundle is
displayed in the inventory, and you must buy items as a complete bundle. The
exception to this is when a player attempts to buy more of an item than their
inventory can hold; in this case, the bundle will be broken and the weapons
are sold on an individual basis, with a small markup applied.
Weapons and accessories may also be sold from a player's inventory. Again, items
are generally sold as a bundle. The player will receive a reduced amount of
money for the sale - hey, the middleman has to make money somewhere :)
In the Inventory screen, two panels are displayed, listing the weapons and
accessories that are available. The
Tab key will switch between the
various panes.
Up Arrow and
Down Arrow will allow the player to
scroll through the list of items,
Right Arrow will buy a bundle, and
Left Arrow will sell a bundle of the currently highlighted item.
For each item, the
name,
bundle size/
total price, and
current inventory are displayed.
Items which can neither be bought or sold will appear darkened. If the player
has maxed their inventory for that item, or they cannot afford to purchase the
item, or the item has a higher
arms level than the player is allowed,
then the item cannot be purchased. Items which can be bought will appear with
an arrow pointing to the right, and items which can be sold will appear with
an arrow pointing to the left.
The items that are available are listed in the next two sections.
WEAPONS LIST¶
This list will be added once the weapons list is reasonably stable.
ACCESSORIES LIST¶
This list will be added once the accessories list is reasonably stable.
BATTLE¶
This overview is sadly, incomplete.
TANK CONTROLS¶
- Left, Right
- Change the turret angle. This will adjust the turret angle in increments
of 5 degrees. For finer control, hold Shift to adjust the angle in
increments of 1 degree.
- Up, Down
- Change the firing power, in the range of 0 to 1000. This will adjust the
firing power in increments of 20. For finer control, hold Shift to
adjust the firing power in increments of 1.
- Tab
- Select the next weapon available in your inventory.
- Shift+Tab
- Select the previous weapon available in your inventory.
- B, b
- Activate a battery. A single battery can restore 5% of damage done to your
tank, and therefore restore the maximum firing power by 5% when you are
damaged. You must have a battery to discharge in your inventory to
excercise this option.
- E, e
- Activate or energize the currently selected shields.
- F, f
- Activate your fuel tanks. A window will be displayed, indicating the
amount of fuel you have available. As long as you have fuel, you may use
the Left and Right arrows to move one unit to the left or
right, respectively. In general, you cannot move your tank up a steep
hill. Immobile tanks will not be able to excercise this option.
- R, r
- Force a redraw of the screen.
- S, s
- Toggle the currently selected shields. The currently selected shields are
the shields which will be used when you Energize. Shields are classified
by a power number with a type suffix: M for magnetic shielding,
F for force shielding, and S for your standard,
run-of-the-mill shields. If no shields are available, 0S is
displayed.
- T, t
- Toggle contact triggers on/off. This is only meaningful if you actually
have some contact triggers of course, and when tunneling is
enabled. Weapons that are fired after this point will have contact
triggers equipped (until you run out).
- 0 - 9
- Display information about a particular player. 1 gives information
about Player 1, and 0 gives information about Player 10.
- Enter
- Accept your orders.
- Ctrl+Y
- Bring up the System Menu (this can also be accessed from the menus). You
can control certain graphics options from the system menu, clear the
screen of smoke trails, and end a round prematurely.
- Ctrl+Z
- Pauses the game.
- Ctrl+R
- Resign from the game. This will end the game for everyone. You will be
asked to confirm the resignation.
The system menu gives you some control over the game while it is in progress. In
this menu, you will have options to change how the game is displayed (e.g. the
Graphics Fast option described below). You also have access to a few
useful commands, described below.
- Mass Kill
- Kills everyone still alive in the round. No player gets credit for the
kills, and none are considered a suicide. This option is useful if all
human players have already been eliminated from the game, but the AI
players are making no progress whatsoever in annihilating each other. This
option ends the current round only.
- Erase Smoke
- If you have used smoke tracers or have Trace Paths enabled, then
this option will clear all smoke trails from the sky.
- Retreat
- N/A
- Resign Game
- Resigns from the current round and all remaining rounds. This option ends
the entire game, and will take you back to the intro screen.
- Sound Setup
- Takes you to the Sound Options window.
AI PLAYERS¶
- Human
- The humans believe they are the superior mind. The AI's rather disagree
with that sentiment. Keep this in mind when you are wondering why 9 AI's
would want to simultaneously target your tank...
- Moron
- This AI fires at random. Of all the AI's, this one has by far the highest
suicide rate. An alternate name is ``Cannon Fodder''.
- Shooter
- This AI goes for targets it has a line-of-sight to. It's not a great
player otherwise. This AI buys weapons that have the best economical
yield, but during the game it will select weapons which have the highest
yield.
- Spreader
- This AI is similar to the Shooter, except a Spreader buys weapons with the
highest yield, without regard for the price.
- Chooser
- This AI chooses a victim. Once chosen, the victim is attacked until they
are dead, or the Chooser loses the ability to reach the victim. This AI
does not need line-of-sight, but fortunately it cannot compensate for
wind.
- Calculater
- This AI is like Chooser, except a Calculater can compensate for the wind.
These guys are fairly deadly in a fight; they also tend to allocate large
budgets to defense and offense.
- Annihilater
- This AI goes for weapons that will cause as much damage as possible,
without much regard for individual victims. This AI prefers spread weapons
to the more focused, precision weapons. A few Annihilaters can clear the
terrain easily. These AI's don't worry about defenses too much. With their
destructive tendency, they won't survive long anyway - but neither will
anyone else.
- Insanity
- No one knows what this AI thinks...
- Unknown
- This selects one of the above AI's at random, but you will not be informed
which AI was selected.
CONFIGURATION OPTIONS¶
Players/Rounds:
- Number of Players (integer, 2-10)
- Set the number of players participating in the game.
- Number of Rounds (integer, >= 1)
- Set the number of rounds to play for this game.
- AI Type (list)
- Select the AI type. Human players are ``Human''; the remaining AI's are
documented above.
- Player Name (string)
- Give a unique name for each player.
- Tank Style (list)
- Select the type/shape of the tank, for each player.
Economics:
- Interest Rate (float, 0-0.30)
- Interest rate for savings, compounded once per round.
- Dynamic Interest (toggle)
- If enabled, interest rates will change during the game.
- Initial Cash (integer, 0-1000000)
- Amount of money each player should start with.
- AIs Can Buy (toggle)
- If enabled, computers are permitted to buy items. The AI's are very
uninteresting if this option is turned off.
- AIs Buy Aggressively (toggle)
- If the previous option is enabled, the AI's will buy items conservatively.
With this option, the AI's will allocate larger budgets and buy bigger
items early in the game.
- Free Market (toggle)
- N/A
- Scoring (list)
- Specify how scoring works, selecting from Basic, Standard, Greedy, or
possibly other methods defined in the configuration file:
- Basic
- Players only receive money for kills and survival.
- Standard
- Players receive less money for kills and survival, but they will also
receive money for damaging an opponent.
- Greedy
- Players are paid as in Standard scoring, but with bonuses for unused
inventory at the end of the round.
- The Lottery (toggle)
- If the lottery is enabled, there will be a random drawing at the start of
each round. A random player will receive a bundle of a random weapon for
free as the lottery award. This is a great way to inject a little extra
life into AIs who are usually conservative buyers. Plus it's always great
fun when you get a free Annihilator...
Physics:
- Air Viscosity (float)
- N/A
- Gravity (float, 0-10)
- Specify the gravity, in pixels per cycle squared (one cycle is roughly 50
milliseconds).
- Ground Damping (float, 0-10)
- Specify the ground damping, used in tunnelling calculations.
- Maximum Wind Speed (float, 0-10)
- Specify the maximum wind speed, in pixels per cycle squared. The actual
wind velocity is initialised once per round, to some value in (-
max, max).
- Wind is Dynamic (toggle)
- Normally the wind remains constant through a round. If this is enabled,
the wind will change once per turn.
- Suspend Dirt (percentage)
- N/A
- Tanks Fall (percentage)
- N/A
- Borders Extend (integer, >= 0)
- This specifies how far off-screen weapons should be tracked, when you are
playing with no walls. When this value is zero, weapons will disappear as
soon as they leave the screen in the horizontal direction, even if wind
would have brought them back on-screen.
- Walls Are (list)
- Specify how weapons behave when they hit a boundary. Note, the ground is
always ``concrete'' -- this specifies how the sides and ceiling
behave:
- None
- The sides and ceiling are open.
- Concrete
- All sides are solid. Weapons hitting any boundary will explode.
- Padded
- Weapons hitting the sides and ceiling will bounce off, although at a
reduced velocity.
- Rubber
- Weapons hitting the boundary will bounce off at exactly the same
velocity.
- Springy
- Weapons hitting the boundary will bounce off with an additional ``kick''
to the velocity.
- Wraparound
- The ceiling is open. Weapons going off one side will reappear on the
opposite side. Explosions will also wrap around the screen if they
detonate near an edge.
- Random
- One of the above types of walls are selected at random.
Landscape:
- Sky (list)
- Specify the background sky.
- Hostile Environment (toggle)
- N/A
- Land Generator (list)
- Specify the generator to use to create the land.
- Bumpiness (percentage)
- Specify the noise on the generated landscape.
Weapons:
- Arms Level (integer, 0-4)
- Specify the maximum arms level for the game. Only weapons with this arms
level or lower may be purchased by any player, under normal
circumstances.
- Bomb Icon Size (integer, 0-4)
- Specify the size of the bomb icons, while they are traversing their path
in the sky. This does not affect the size of explosions, or the size of
the smoke paths (if trace paths is on).
- Tunneling (toggle)
- If set, weapons are allowed to tunnel through land. If you enable this,
you will want to buy contact triggers if you want a particular weapon to
always detonate on impact (instead of tunneling through land).
- Scaling (float)
- Scale the size of explosions by this value. If playing on a very large or
very small playing field, you might want to adjust this value.
- Trace Paths (toggle)
- If enabled, all weapons leave a smoke trail to reveal their trajectory. If
this option is off, you can still use Smoke Tracers to determine
the path a weapon will take.
- Useless Items (toggle)
- Some weapons are not useful given the current configuration (e.g. contact
triggers are irrelevant if tunneling is disabled). If this option is
enabled, then weapons which will have no effect are not listed in the
inventory screens.
Graphics:
- Screen Width (integer)
- Set the width of the playing field, in pixels.
- Screen Height (integer)
- Set the height of the playing field, in pixels.
- Dithering (toggle)
- If enabled, the land and sky gradients will be dithered. This option is
particularly useful on 16-bit displays, where the gradient is very
noticeable otherwise. This does slow down land generation somewhat.
- Animation (toggle)
- If enabled, explosions and other effects will be animated. This option can
also be controlled from the System Menu.
- Graphics Are Fast (toggle)
- If enabled, all graphics are always as fast as possible. This option can
also be controlled from the System Menu.
- Computers Are Fast (toggle)
- If enabled, graphics are fast when there only computer players are alive.
This option can also be controlled from the System Menu.
Gameplay Options:
- Mode (list)
- Determines if all players will fire at once (Synchronous), or
whether each player will fire independently ( Sequential).
- Teams (list)
- N/A
- Order (list)
- Determines the player order.
- Talk Mode (list)
- Determines who is allowed to talk.
- Talk Probability (percentage)
- Determines the likelihood that a player will speak at the end of a
turn.
- Extended Status (toggle)
- If set, the status bar will contain an additional row of extended
information during the game (things such as trigger and battery
inventories, life, wind).
- Tooltips (toggle)
- If set, tooltips will be displayed where available. A restart is required
to change the value of this option.
AI Controller:
- Human Target Practice (toggle)
- AI's will always prefer human targets to AI targets (except for AI's that
fire at random). When playing against 9 Calculators, this can make your
day pretty lousy.
- Allow Offset Targetting (toggle)
- Generally, when a weapon hits a shield it does less damage than an
explosion detonating right outside the shield (weapons hitting the shield
do not have a chance to detonate). This changes the AI targetting
behaviour so they will deliberately aim outside the shield, if their
intended victim has raised shields.
- Always Offset (toggle)
- If the above option is set, this option will force the AI to always offset
its targetting as if the player had raised shields. This allows the AI to
compensate for cases where the player may simply not have had their turn
yet to raise shields. The downside is the AI will never attempt to score a
direct hit with this option enabled.
- Enable Scan Refinement (toggle)
- If set, harder AIs are allowed to refine their trajectories by computing
trajectories that take into account player shielding effect and various
other factors they do not normally consider. This option could slow down
gameplay a bit but makes the AIs much more difficult.
- No Budget Constraints (toggle)
- AI's will spend as much money as they can, disregarding their budget
preferences.
Sound Setup:
- Enable Sound (toggle)
- When set, music and sound effects will be played.
- Use HQ Mixer (toggle)
- When set, mikmod's high-quality mixer will be used.
COMMAND-LINE OPTIONS¶
- --help
- Display a brief synopsis of the command-line options available.
- --insanity
- This is insanity, Max! Or what if it's genius?
- --yields
- Display weapon yields, and economical yields.
- --geometry=wxh
- Specify an initial window geometry for xscorch, where w is the
width and h is the height of the playing field. Useful for displays
less than around 800x600 resolution. Note this option overrides the
settings in the config file, but you can save the new options to your
config file so you don't have to specify this every time. You may also use
-g.
- --config=file
- Load an alternate user config file, in file.
- --sound
- Enable music and sound effects. You may also use -S.
- --nosound
- Disable music and sound effects. You may also use -s.
- --hqmixer
- Enable use of the high-quality mixer, if sound is enabled. This may use a
lot of CPU power on older machines.
- --nohqmixer
- Disable use of the high-quality mixer, if sound is enabled.
- --name
- Set the name of your player, if you are initiating a network game. By
default, your user name is used.
- --port
- Set the port number to use in a network game. This option is only relevant
if you also specify --client or --server. The default is
dependent on the protocol number, but is some large port number.
- --client=server
- Start xscorch in client mode, and connect to server (which should
already be running). If --name and --port are not specified,
reasonable defaults are used.
- --server
- Start xscorch in server mode, and wait for connections from the clients.
--name may be used in conjunction to specify the name of this
player.
NETWORK MODE¶
This is very unstable right now, and therefore is not documented.
FILES¶
- ~/.xscorch/config
- User's default configuration for xscorch.
- tankprofiles
- Profile bitmaps for the tanks, usually stored in the local share
directory.
SEE ALSO¶
The xscorch home page at <
http://www.xscorch.org/>. There is also
additional documentation in the source distribution.
AUTHORS¶
xscorch was written by Justin David Smith <justins(at)chaos2.org> and
Jacob Luna Lundberg <jacob(at)gnifty.net>. (Please do not list these
e-mail addresses on webpages, or list them in other packages, without
contacting us first.)
This manual page written by Justin David Smith <justins(at)chaos2.org>.
Copyright(c) 2001,2000 Justin David Smith.