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-rw-r--r--static/src/assets/trading-in-the-rain/Distributor.js42
1 files changed, 42 insertions, 0 deletions
diff --git a/static/src/assets/trading-in-the-rain/Distributor.js b/static/src/assets/trading-in-the-rain/Distributor.js
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+++ b/static/src/assets/trading-in-the-rain/Distributor.js
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+function distribute(val, minOld, maxOld, minNew, maxNew) {
+ let scalar = (val - minOld) / (maxOld - minOld);
+ return minNew + ((maxNew - minNew) * scalar);
+}
+
+function Distributor(capacity) {
+ this.cap = capacity;
+
+ this.reset = () => {
+ this.arr = [];
+ this.arrSorted = [];
+ this.length = 0;
+ };
+ this.reset();
+
+ // add adds the given value into the series, shifting off the oldest value if
+ // the series is at capacity.
+ this.add = (val) => {
+ this.arr.push(val);
+ if (this.arr.length >= this.cap) this.arr.shift();
+ this.arrSorted = this.arr.slice(); // copy array
+ this.arrSorted.sort();
+ this.length = this.arr.length;
+ };
+
+ // distribute finds where the given value falls within the series, and then
+ // scales that into the given range (inclusive).
+ this.distribute = (val, min, max) => {
+ if (this.length == 0) throw "cannot locate within empty Distributor";
+
+ let idx = this.length;
+ for (i in this.arrSorted) {
+ if (val < this.arrSorted[i]) {
+ idx = i;
+ break;
+ }
+ }
+
+ return distribute(idx, 0, this.length, min, max);
+ };
+}
+