From 6c4da7fac6ea909adac1be00e238d213e84c0ec6 Mon Sep 17 00:00:00 2001
From: Brian Picciano <mediocregopher@gmail.com>
Date: Sun, 26 Apr 2020 18:15:15 -0600
Subject: add trading in the rain post

---
 assets/trading-in-the-rain/SeriesComposer.js | 51 ++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 assets/trading-in-the-rain/SeriesComposer.js

(limited to 'assets/trading-in-the-rain/SeriesComposer.js')

diff --git a/assets/trading-in-the-rain/SeriesComposer.js b/assets/trading-in-the-rain/SeriesComposer.js
new file mode 100644
index 0000000..134c64c
--- /dev/null
+++ b/assets/trading-in-the-rain/SeriesComposer.js
@@ -0,0 +1,51 @@
+function SeriesComposer(resource, rainCanvas, color) {
+  this.rainCanvas = rainCanvas;
+  this.color = color;
+
+  this.priceDist = new Distributor(200);
+  this.volumeDist = new Distributor(200);
+  this.musicBox = new MusicBox(this.priceDist, this.volumeDist);
+
+  this.enabled = false;
+  this.setEnabled = (enabled) => this.enabled = enabled;
+  this.getEnabled = () => { return this.enabled; }
+
+  this.totalTrades = 0;
+  this.getTotalTrades = () => { return this.totalTrades; }
+
+  this.cw = new CW(resource);
+  this.cw.ontrades = (trades) => {
+    if (this.totalTrades > 0 && this.enabled) {
+      let priceVols = {}; // sum volumes by price, for deduplication
+      for (let i in trades) {
+        let price = trades[i].price, volume = trades[i].volume;
+        if (!priceVols[price]) priceVols[price] = 0;
+        priceVols[price] += volume;
+      }
+
+      trades = []; // overwrite trades with deduplicated ones.
+      for (let price in priceVols) {
+        let volume = priceVols[price];
+        let intensity = this.volumeDist.distribute(volume, 0, 1);
+        this.rainCanvas.newDrop({
+          x: this.priceDist.distribute(price, 0, 1),
+          y: Math.random(),
+          intensity: intensity,
+          color: this.color,
+        });
+
+        trades.push({price: price, volume: volume});
+      }
+
+      this.musicBox.playTrades(trades);
+    }
+
+    for (let i in trades) {
+      this.priceDist.add(trades[i].price);
+      this.volumeDist.add(trades[i].volume);
+    }
+
+    this.totalTrades += trades.length;
+    if (this.ontrades) this.ontrades(trades);
+  };
+}
-- 
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