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document StatDrop (#88)

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alex 2020-10-22 06:01:11 +01:00 committed by GitHub
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docs/doxygen_custom.css
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include/map.h
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@ -61,12 +61,25 @@ typedef struct ItemDrop {
/* 0x04 */ s16 unk_08;
} ItemDrop; // size = 0x06
/// @brief Describes heart/flower drop chances after defeating an Npc in the overworld.
///
/// The algorithm for calculating the number of hearts/flowers from a StatDrop is:
/// - If current HP/FP > cutoff, drop 0.
/// - Roll generalChance. If it fails, drop 0.
/// - Roll chancePerAttempt attempts times. For each success, drop a heart/flower.
///
/// StaticNpc holds a table of StatDrops for each stat (hearts, flowers). All are checked together
/// and the number of hearts/flowers to drop is the total number of successful attempts for each stat.
///
/// Each heart/flower is worth 1 HP and 1 FP respectively, if picked up.
///
/// cutoff, generalChance, and chancePerAttempt are short fixed-point percentage values.
/// That is, `F16(0)` is a 0% chance and `F16(100)` is a 100% chance.
typedef struct StatDrop {
// NOTE: these %s are F16
/* 0x00 */ s16 hpCutoff; // % of max HP/FP
/* 0x02 */ s16 generalChance; // %
/* 0x04 */ s16 attempts;
/* 0x06 */ s16 chancePerAttempt; // %
/* 0x00 */ s16 cutoff; ///< % of max HP/FP. If current HP/FP > cutoff, no hearts/flowers can be dropped.
/* 0x02 */ s16 generalChance; ///< % chance for any hearts/flowers to be dropped at all from this StatDrop.
/* 0x04 */ s16 attempts; ///< Maximum number of hearts/flowers that can be dropped from this StatDrop.
/* 0x06 */ s16 chancePerAttempt; ///< % chance for a single heart/flower to be dropped from each attempt.
} StatDrop; // size = 0x08
#define NO_DROPS { F16(100), F16(0), 0, F16(0) }