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fix(drops): Overhaul drops to a percentage multiplier system

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WIP. Initial draft of an overhaul to drop chance. Most important bits: (1) A modular system of percentage-based multipliers on the task-value-based initial drop chance. (2) Perception increases the daily drop cap by 1 per 10 points.

Fixes HabitRPG/habitrpg/#1922.
This commit is contained in:
Sabe Jones 2014-02-16 11:12:04 -06:00
parent d3c1a70619
commit b75000188f
1 changed files with 16 additions and 10 deletions
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26
script/index.coffee
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@ -980,23 +980,29 @@ api.wrap = (user, main=true) ->
{task} = modifiers
# % chance of getting a drop
bonus =
Math.abs(task.value) * # + Task Redness
task.priority + # * Task Priority
(task.streak or 0) + # + Streak bonus
(user._statsComputed.per * .5) # + Perception
bonus /= 100 # /100 (as a percent)
chance = api.diminishingReturns(bonus, 1, 0.5) # see HabitRPG/habitrpg#1922 for details
#console.log "Drop Equation: Bonus(#{bonus.toFixed(3)}), Modified Chance(#{chance.toFixed(3)})\n"
chance = Math.abs(task.value - 21.27) / 1000 # Base drop chance based on task value. This formula will tend to give us base chance in the 1% to 2% range, topping out at 6.8%.
chance *=
task.priority * # Task priority multiplier: 50% for Medium, 100% for Hard
(1 + (task.streak / 100 or 0)) * # Streak bonus: 1% multiplier per streak
(1 + (user._statsComputed.per / 100)) * # PERception: 1% multiplier per point
(1 + (user.contributor.level / 50 or 0)) * # Contrib levels: 2% multiplier per level
(1 + (user.achievements.rebirths / 50 or 0)) * # Rebirths: 2% multiplier per achievement
(1 + (user.achievements.streak / 100 or 0)) * # Streak achievements: 1% multiplier per achievement
(user._tmp.crit or 1) * # Use the crit multiplier if we got one
(1 + (_.reduce(task.checklist,((m,i)->m+(if i.completed then 1 else 0)),0) or 0)) # 100% multiplier per checklist item complete
#console.log("Drop chance: " + chance)
quest = content.quests[user.party.quest?.key]
if quest?.collect and user.fns.predictableRandom(user.stats.gp) < bonus # NOTE: < bonus, higher chance than drops
if quest?.collect and user.fns.predictableRandom(user.stats.gp) < (chance * 2) # 2x as likely to get a collection quest drop as a pet item drop
dropK = user.fns.randomVal quest.collect, {key:true}
user.party.quest.progress.collect[dropK]++
user.markModified? 'party.quest.progress'
#console.log {progress:user.party.quest.progress}
return if (api.daysSince(user.items.lastDrop.date, user.preferences) is 0) and (user.items.lastDrop.count >= 5)
return if (api.daysSince(user.items.lastDrop.date, user.preferences) is 0) and (user.items.lastDrop.count >= 5 + Math.floor(user._statsComputed.per / 10))
if user.flags?.dropsEnabled and user.fns.predictableRandom(user.stats.exp) < chance
# current breakdown - 1% (adjustable) chance on drop