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Aurora.3/code/__DEFINES/maths.dm
2024-02-29 18:30:04 +00:00

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#define SHORT_REAL_LIMIT 16777216
//"fancy" math for calculating time in ms from tick_usage percentage and the length of ticks
//percent_of_tick_used * (ticklag * 100(to convert to ms)) / 100(percent ratio)
//collapsed to percent_of_tick_used * tick_lag
#define TICK_DELTA_TO_MS(percent_of_tick_used) ((percent_of_tick_used) * world.tick_lag)
#define TICK_USAGE_TO_MS(starting_tickusage) (TICK_DELTA_TO_MS(TICK_USAGE_REAL - starting_tickusage))
/// Gets the sign of x, returns -1 if negative, 0 if 0, 1 if positive
#define SIGN(x) ( ((x) > 0) - ((x) < 0) )
#define CEILING(x, y) ( -round(-(x) / (y)) * (y) )
#define ROUND_UP(x) ( -round(-(x)))
/// Converts a probability/second chance to probability/seconds_per_tick chance
/// For example, if you want an event to happen with a 10% per second chance, but your proc only runs every 5 seconds, do `if(prob(100*SPT_PROB_RATE(0.1, 5)))`
#define SPT_PROB_RATE(prob_per_second, seconds_per_tick) (1 - (1 - (prob_per_second)) ** (seconds_per_tick))
/// Like SPT_PROB_RATE but easier to use, simply put `if(SPT_PROB(10, 5))`
#define SPT_PROB(prob_per_second_percent, seconds_per_tick) (prob(100*SPT_PROB_RATE((prob_per_second_percent)/100, (seconds_per_tick))))