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copied!<p>There are three answers to implementing propegated stats in a video game:</p> <p>(1) this will satisfy any hobbist-game you will ever make (and pretty much every professional game as well):</p> <pre><code>character.GetStrength() { foreach(item in character.items) strFromItems += item.GetStrengthBonusForItems(); foreach(buff in character.buffs) strFromBuffs += buff.GetStrengthBonusForBuffs(); ... return character.baseStrength + strFromItems + ...; } </code></pre> <p>(note the different GetStrength*() functions have nothing to do with each other)</p> <p>(2) this will satisfy all games that don't have the word 'diablo' in the title:</p> <pre><code> character.GetStr() { ... // same as above, strength is rarely queried } character.GetMaxHP() { if (character._maxHPDirty) RecalcMaxHP(); return character.cachedMaxHP; } // repeat for damage, and your probably done, but profile to figure out // exactly which stats are important to your game </code></pre> <p>(3) else</p> <pre><code> // changes in diablo happen very infrequently compared to queries, // so up propegate to optimize queries. Moreover, 10 people edit // the stat calculation formulas so having the up propegation match // the caculation w/o writing code is pretty important for robustness. character.OnEquip(item) { statList.merge(item.statlist); } character.GetStrength() { statList.getStat(STRENGTH); } statlist.getStat(id) { if (IS_FAST_STAT(id)) return cachedFastStats[id]; return cachedStats.lookup(id); } statlist.merge(statlist) { // left for an exercise for the reader } </code></pre> <p>And honestly (3) was probably overkill.</p>

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