From b54a1c9686eec3c1114e9b58cb67679ba59c45bd Mon Sep 17 00:00:00 2001
From: Luke Shumaker <lukeshu@lukeshu.com>
Date: Wed, 14 Mar 2018 18:18:31 -0400
Subject: directories

---
 public-src/colordate.js | 41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 public-src/colordate.js

(limited to 'public-src/colordate.js')

diff --git a/public-src/colordate.js b/public-src/colordate.js
new file mode 100644
index 0000000..e5331eb
--- /dev/null
+++ b/public-src/colordate.js
@@ -0,0 +1,41 @@
+(function() {
+	// in milliseconds
+	var now = Date.now();
+	var oneday = 1000*60*60*24;
+
+	// maps from a point on iRange to a point on oRange
+	var mapRange = function(iRange, oRange, iPoint) {
+		var pct = (iPoint - iRange[0])/(iRange[1]-iRange[0]);
+		if (pct < 0) {
+			pct = 0;
+		} else if (pct > 1) {
+			pct = 1;
+		}
+		var oPoint = oRange[0] + (pct * (oRange[1]-oRange[0]));
+		return oPoint;
+	}
+
+
+	var rgb = function(r, g, b) {
+		return "rgb(" + Math.trunc(r) + "," + Math.trunc(g) + "," + Math.trunc(b) + ")";
+	};
+
+	var date2color = function(t) {
+		var max = 0xFF;
+		var red = mapRange([now-oneday, now-(oneday/2)],
+				[max, 0],
+				t);
+		var green = mapRange([now-(oneday/2), now],
+				[0, max],
+				t);
+		return rgb(max-green, max-red, max-green-red);
+	};
+
+	var main = function() {
+		document.querySelectorAll('time.daily').forEach(function(time) {
+			time.style.backgroundColor = date2color(Date.parse(time.dateTime));
+		});
+	};
+
+	document.addEventListener("DOMContentLoaded", main, false);
+})();
-- 
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