73 lines
2.3 KiB
Go
73 lines
2.3 KiB
Go
package gamedata
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import "math"
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// Stat is the small, protocol-independent subset of character statistics
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// needed by the local server. The client uses the same two kinds of values
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// for every stat: a flat contribution and a percentage contribution.
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type Stat int
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const (
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StatHealth Stat = iota + 1
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StatAttack
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StatMagic
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StatDefencePercent
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StatMagicResistancePercent
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StatCriticalChance
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StatCriticalDamage
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StatElementDamage
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StatElementResistance
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)
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// StatContribution is one already-resolved contribution from an equipment
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// option, costume, collection, awakening, or another account system. Percent
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// is expressed as a fraction (0.08 means 8%), matching the client formula.
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type StatContribution struct {
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Stat Stat
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Flat float64
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Percent float64
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// Option preserves the exact Define_CharStatOption for systems such as
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// awakening whose element-specific distinctions exceed BaseStats.
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Option uint64
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}
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// BaseStats contains the design value after the character level curve has
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// been applied. It is deliberately separate from CharacterStats so callers
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// cannot accidentally persist a derived value as design data.
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type BaseStats struct {
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Health float64
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Attack float64
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Magic float64
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}
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// AggregateStats applies the final client-side aggregation order:
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//
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// final = base + round(((base + flat) * (1 + percent)) - base)
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//
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// The game truncates the design value before applying account contributions;
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// the final bonus is truncated toward zero as well. Keeping this operation
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// in one place prevents revival, CharInfo, and battle code from developing
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// subtly different HP calculations.
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func AggregateStats(base BaseStats, contributions []StatContribution) BaseStats {
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flat := map[Stat]float64{}
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percent := map[Stat]float64{}
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for _, contribution := range contributions {
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if contribution.Stat == 0 {
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continue
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}
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flat[contribution.Stat] += contribution.Flat
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percent[contribution.Stat] += contribution.Percent
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}
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return BaseStats{
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Health: aggregateOne(base.Health, flat[StatHealth], percent[StatHealth]),
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Attack: aggregateOne(base.Attack, flat[StatAttack], percent[StatAttack]),
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Magic: aggregateOne(base.Magic, flat[StatMagic], percent[StatMagic]),
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}
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}
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func aggregateOne(base, flat, percent float64) float64 {
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base = math.Trunc(base)
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bonus := ((base + flat) * (1 + percent)) - base
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return base + math.Trunc(bonus)
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}
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