From 1795891933e11adc7fcd711d23ce419c95e9b50f Mon Sep 17 00:00:00 2001
From: Nick Winter <livelily@gmail.com>
Date: Wed, 18 Feb 2015 09:06:32 -0800
Subject: [PATCH] Added new pow function for simulated ladder games
 achievement.

---
 app/core/utils.coffee                 | 5 +++++
 app/schemas/models/achievement.coffee | 2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/app/core/utils.coffee b/app/core/utils.coffee
index 18b20fa8b..572b3a3da 100644
--- a/app/core/utils.coffee
+++ b/app/core/utils.coffee
@@ -97,10 +97,15 @@ createQuadraticFunc = (params) ->
 createLogFunc = (params) ->
   (x) -> if x > 0 then (params.a or 1) * Math.log((params.b or 1) * (x + (params.c or 0))) + (params.d or 0) else 0
 
+# f(x) = ax^b + c
+createPowFunc = (params) ->
+  (x) -> (params.a or 1) * Math.pow(x, params.b or 1) + (params.c or 0)
+
 module.exports.functionCreators =
   linear: positify(createLinearFunc)
   quadratic: positify(createQuadraticFunc)
   logarithmic: positify(createLogFunc)
+  pow: positify(createPowFunc)
 
 # Call done with true to satisfy the 'until' goal and stop repeating func
 module.exports.keepDoingUntil = (func, wait=100, totalWait=5000) ->
diff --git a/app/schemas/models/achievement.coffee b/app/schemas/models/achievement.coffee
index 98d4767ad..fdf783754 100644
--- a/app/schemas/models/achievement.coffee
+++ b/app/schemas/models/achievement.coffee
@@ -66,7 +66,7 @@ _.extend AchievementSchema.properties,
     type: 'object'
     description: 'Function that gives total experience for X amount achieved'
     properties:
-      kind: {enum: ['linear', 'logarithmic', 'quadratic'] }
+      kind: {enum: ['linear', 'logarithmic', 'quadratic', 'pow'] }
       parameters:
         type: 'object'
         default: { a: 1, b: 0, c: 0 }