Game.LambdaHack.Common.Time

Game time and speed.

Documentation

data Time

Game time in ticks. The time dimension. One tick is 1 microsecond (one millionth of a second), one turn is 0.5 s.

Instances

Eq Time

Defined in Game.LambdaHack.Common.Time

Methods

(==) :: Time -> Time -> Bool

(/=) :: Time -> Time -> Bool

Ord Time

Defined in Game.LambdaHack.Common.Time

Methods

compare :: Time -> Time -> Ordering

(<) :: Time -> Time -> Bool

(<=) :: Time -> Time -> Bool

(>) :: Time -> Time -> Bool

(>=) :: Time -> Time -> Bool

max :: Time -> Time -> Time

min :: Time -> Time -> Time

Show Time

Defined in Game.LambdaHack.Common.Time

Methods

showsPrec :: Int -> Time -> ShowS

show :: Time -> String

showList :: [Time] -> ShowS

Binary Time

Defined in Game.LambdaHack.Common.Time

Methods

put :: Time -> Put

get :: Get Time

putList :: [Time] -> Put

timeTicks :: Time -> Int64

timeZero :: Time

Start of the game time, or zero lenght time interval.

timeEpsilon :: Time

An infinitesimal time period.

timeClip :: Time

At least once per clip all moves are resolved and a frame or a frame delay is generated. Currently one clip is 0.05 s, but it may change, and the code should not depend on this fixed value.

timeTurn :: Time

One turn is 0.5 s. The code may depend on that. Actors at normal speed (2 m/s) take one turn to move one tile (1 m by 1 m).

timeSecond :: Time

This many ticks fits in a single second.

clipsInTurn :: Int

This many clips fit in one turn. Determines the resolution of actor move sampling and display updates.

absoluteTimeAdd :: Time -> Time -> Time

Absolute time addition, e.g., for summing the total game session time from the times of individual games.

absoluteTimeSubtract :: Time -> Time -> Time

absoluteTimeNegate :: Time -> Time

Absolute time negation. To be used for reversing time flow, e.g., for comparing absolute times in the reverse order.

timeFit :: Time -> Time -> Int

How many time intervals of the latter kind fits in an interval of the former kind.

timeFitUp :: Time -> Time -> Int

How many time intervals of the latter kind cover an interval of the former kind (rounded up).

timeRecent5 :: Time -> Time -> Bool

newtype Delta a

One-dimentional vectors. Introduced to tell apart the 2 uses of Time: as an absolute game time and as an increment.

Constructors

Delta a

Instances

Functor Delta

Defined in Game.LambdaHack.Common.Time

Methods

fmap :: (a -> b) -> Delta a -> Delta b

(<$) :: a -> Delta b -> Delta a

Eq a => Eq (Delta a)

Defined in Game.LambdaHack.Common.Time

Methods

(==) :: Delta a -> Delta a -> Bool

(/=) :: Delta a -> Delta a -> Bool

Ord a => Ord (Delta a)

Defined in Game.LambdaHack.Common.Time

Methods

compare :: Delta a -> Delta a -> Ordering

(<) :: Delta a -> Delta a -> Bool

(<=) :: Delta a -> Delta a -> Bool

(>) :: Delta a -> Delta a -> Bool

(>=) :: Delta a -> Delta a -> Bool

max :: Delta a -> Delta a -> Delta a

min :: Delta a -> Delta a -> Delta a

Show a => Show (Delta a)

Defined in Game.LambdaHack.Common.Time

Methods

showsPrec :: Int -> Delta a -> ShowS

show :: Delta a -> String

showList :: [Delta a] -> ShowS

Binary a => Binary (Delta a)

Defined in Game.LambdaHack.Common.Time

Methods

put :: Delta a -> Put

get :: Get (Delta a)

putList :: [Delta a] -> Put

timeShift :: Time -> Delta Time -> Time

Shifting an absolute time by a time vector.

timeDeltaToFrom :: Time -> Time -> Delta Time

Time time vector between the second and the first absolute times. The arguments are in the same order as in the underlying scalar subtraction.

timeDeltaAdd :: Delta Time -> Delta Time -> Delta Time

Addition of time deltas.

timeDeltaSubtract :: Delta Time -> Delta Time -> Delta Time

Subtraction of time deltas. The arguments are in the same order as in the underlying scalar subtraction.

timeDeltaReverse :: Delta Time -> Delta Time

Reverse a time vector.

timeDeltaScale :: Delta Time -> Int -> Delta Time

Scale the time vector by an Int scalar value.

timeDeltaPercent :: Delta Time -> Int -> Delta Time

Take the given percent of the time vector.

timeDeltaDiv :: Delta Time -> Int -> Delta Time

Divide a time vector.

timeDeltaToDigit :: Delta Time -> Delta Time -> Char

Represent the main 10 thresholds of a time range by digits, given the total length of the time range.

timeDeltaInSecondsText :: Delta Time -> Text

data Speed

Speed in meters per 1 million seconds (m/Ms). Actors at normal speed (2 m/s) take one time turn (0.5 s) to make one step (move one tile, which is 1 m by 1 m).

Instances

Eq Speed

Defined in Game.LambdaHack.Common.Time

Methods

(==) :: Speed -> Speed -> Bool

(/=) :: Speed -> Speed -> Bool

Ord Speed

Defined in Game.LambdaHack.Common.Time

Methods

compare :: Speed -> Speed -> Ordering

(<) :: Speed -> Speed -> Bool

(<=) :: Speed -> Speed -> Bool

(>) :: Speed -> Speed -> Bool

(>=) :: Speed -> Speed -> Bool

max :: Speed -> Speed -> Speed

min :: Speed -> Speed -> Speed

Show Speed

Defined in Game.LambdaHack.Common.Time

Methods

showsPrec :: Int -> Speed -> ShowS

show :: Speed -> String

showList :: [Speed] -> ShowS

Binary Speed

Defined in Game.LambdaHack.Common.Time

Methods

put :: Speed -> Put

get :: Get Speed

putList :: [Speed] -> Put

toSpeed :: Int -> Speed

Constructor for content definitions.

fromSpeed :: Speed -> Int

Readable representation of speed in the format used in content definitions.

minSpeed :: Int

displaySpeed :: Int -> String

Pretty-print speed given in the format used in content definitions.

speedWalk :: Speed

Fast walk speed (2 m/s) that suffices to move one tile in one turn.

speedLimp :: Speed

Limp speed (1 m/s) that suffices to move one tile in two turns. This is the minimal speed for projectiles to fly just one space and drop.

speedThrust :: Speed

Sword thrust speed (10 m/s). Base weapon damages, both melee and ranged, are given assuming this speed and ranged damage is modified accordingly when projectile speeds differ. Differences in melee weapon swing speeds are captured in damage bonuses instead, since many other factors influence total damage.

Billiard ball is 25 ms, sword swing at the tip is 35 ms, medieval bow is 70 ms, AK47 is 700 ms.

modifyDamageBySpeed :: Int64 -> Speed -> Int64

Modify damage when projectiles is at a non-standard speed. Energy and so damage is proportional to the square of speed, hence the formula.

speedScale :: Rational -> Speed -> Speed

Scale speed by a scalar value.

speedAdd :: Speed -> Speed -> Speed

Speed addition.

ticksPerMeter :: Speed -> Delta Time

The number of time ticks it takes to walk 1 meter at the given speed.

speedFromWeight :: Int -> Int -> Speed

Calculate projectile speed from item weight in grams and velocity percent modifier. See https://github.com/LambdaHack/LambdaHack/wiki/Item-statistics.

rangeFromSpeedAndLinger :: Speed -> Int -> Int

Calculate maximum range taking into account the linger percentage.

Internal operations

_timeTick :: Time

The smallest unit of time. Should not be exported and used elsewhere, because the proportion of turn to tick is an implementation detail. The significance of this detail is only that it determines resolution of the time dimension.

turnsInSecond :: Int64

This many turns fit in a single second.

sInMs :: Int64

Number of seconds in a mega-second.

minimalSpeed :: Int64

The minimal speed is half a meter (half a step across a tile) per second (two standard turns, which the time span during which projectile moves, unless it has modified linger value). This is four times slower than standard human movement speed.

It needen't be lower, because rangeFromSpeed gives 0 steps with such speed, so the actor's trajectory is empty, so it drops down at once. Twice that speed already moves a normal projectile one step before it stops. It shouldn't be lower or a slow actor would incur such a time debt for performing a single action that he'd be paralyzed for many turns, e.g., leaving his dead body on the screen for very long.

rangeFromSpeed :: Speed -> Int

Calculate maximum range in meters of a projectile from its speed. See https://github.com/LambdaHack/LambdaHack/wiki/Item-statistics. With this formula, each projectile flies for at most 1 second, that is 2 standard turns, and then drops to the ground.