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/main.js | 144 +++++++++++++++++++++++++++++++++++++
 1 file changed, 144 insertions(+)
 create mode 100644 assets/trading-in-the-rain/main.js

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

diff --git a/assets/trading-in-the-rain/main.js b/assets/trading-in-the-rain/main.js
new file mode 100644
index 0000000..09bd26e
--- /dev/null
+++ b/assets/trading-in-the-rain/main.js
@@ -0,0 +1,144 @@
+const tradesToWaitFor = 5;
+
+function hexToRgb(hex) {
+  var result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
+  return [
+    parseInt(result[1], 16),
+    parseInt(result[2], 16),
+    parseInt(result[3], 16),
+  ];
+}
+
+const colorPalette = [
+  "#28D2EE",
+  "#ED778E",
+  "#6557DC",
+  "#EEE386",
+  "#B55AA0",
+];
+
+// Use https://api.cryptowat.ch/markets/<exchange>
+// or https://api.cryptowat.ch/pairs (for "all")
+const markets = {
+  "kraken":[
+    {
+      name: "BTCUSD",
+      resource: "markets:87:trades",
+    },
+    {
+      name: "BTCEUR",
+      resource: "markets:86:trades",
+    },
+    {
+      name: "BTCEUR",
+      resource: "markets:96:trades",
+    },
+    {
+      name: "ETHEUR",
+      resource: "markets:97:trades",
+    },
+    {
+      name: "BCHUSD",
+      resource: "markets:146:trades",
+    },
+  ],
+  "bitfinex":[
+    {
+      name: "BTCUSD",
+      resource: "markets:1:trades",
+    },
+    {
+      name: "ETHUSD",
+      resource: "markets:4:trades",
+    },
+    {
+      name: "BSVUSD",
+      resource: "markets:5558:trades",
+    },
+    {
+      name: "BTCEUR",
+      resource: "markets:415:trades",
+    },
+    {
+      name: "XRPUSD",
+      resource: "markets:25:trades",
+    },
+  ],
+  "all": [
+    {
+      name: "BTCUSD",
+      resource: "instruments:9:trades",
+    },
+    {
+      name: "ETHUSD",
+      resource: "instruments:125:trades",
+    },
+    {
+      name: "LTCUSD",
+      resource: "instruments:138:trades",
+    },
+    {
+      name: "EOSUSD",
+      resource: "instruments:4:trades",
+    },
+    {
+      name: "XRPUSD",
+      resource: "instruments:160:trades",
+    },
+  ],
+};
+
+const exchange = "all";
+
+function fillMarketP() {
+  let marketsEl = document.getElementById("markets");
+  for (let i in markets[exchange]) {
+    let name = markets[exchange][i].name;
+    let color = colorPalette[i];
+    if (i > 0) marketsEl.innerHTML += "</br>";
+    marketsEl.innerHTML += `<strong style="color: ${color}; font-size: 2rem;">${name}</strong>`;
+  }
+}
+
+function run() {
+  document.getElementById("button").style.display = "none";
+
+  let progress = document.getElementById("progress");
+  progress.innerHTML = "Connecting to Cryptowat.ch...";
+
+  let canvas = document.getElementById("rainCanvas");
+  let rainCanvas = new RainCanvas(canvas);
+
+  let modalHidden = false;
+  for (let i in markets[exchange]) {
+    let seriesComposer = new SeriesComposer(
+      markets[exchange][i].resource,
+      rainCanvas, 
+      hexToRgb(colorPalette[i]),
+    );
+
+    seriesComposer.cw.onconnect = () => {
+      progress.innerHTML = "Preloading a few trades before continuing.";
+    };
+
+    // wait for each series to rech tradesToWaitFor before letting it begin.
+    // Hide the modal when the first series is enabled.
+    seriesComposer.ontrades = (trades) => {
+      if (!modalHidden && seriesComposer.getTotalTrades() < tradesToWaitFor) {
+        progress.innerHTML += "."; // indicate that _something_ is happening
+        return;
+      }
+      if (!modalHidden) {
+        let modal = document.getElementById("tradingInRainModal");
+        modal.style.display = "none";
+        modalHidden = true;
+      }
+      seriesComposer.setEnabled(true);
+      seriesComposer.ontrades = undefined;
+    };
+  }
+}
+
+function autorun() {
+  loadMIDI();
+}
-- 
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