From 0b7d7767f5c278550803901bc6fac83734fbd05f Mon Sep 17 00:00:00 2001
From: Jon Lippincott <jonlippincott@gmail.com>
Date: Tue, 7 Aug 2018 00:33:54 -0400
Subject: [PATCH] Added support for getting at the normalized bar data. Useful
 for those of us who don't want to use images, but do want the data to render
 to canvas, etc.

---
 lib/render.js  |  6 ++++++
 test/render.js | 18 ++++++++++++++++++
 2 files changed, 24 insertions(+)

diff --git a/lib/render.js b/lib/render.js
index 1db7cf7..8105064 100644
--- a/lib/render.js
+++ b/lib/render.js
@@ -120,9 +120,11 @@ module.exports = function render (url, options, cb) {
     }
 
     var maxValue = Math.max.apply(null, vals)
+    var normalizedVals = [];
 
     vals.forEach(function (val, index) {
       var scale = options.height / maxValue
+      normalizedVals.push(val / maxValue);
       val *= scale
       var w = options.barWidth
       if (options.barGap !== 0) {
@@ -160,5 +162,9 @@ module.exports = function render (url, options, cb) {
       canvasContext.fillRect(0, options.baseline - (options.baselineWidth / 2), options.width, options.baselineWidth)
     }
     cb(null, canvas.toBuffer())
+
+    if (options.normalizedValuesCallback) {
+      options.normalizedValuesCallback(normalizedVals);
+    }
   })
 }
diff --git a/test/render.js b/test/render.js
index 2e38c82..7a6d9cf 100644
--- a/test/render.js
+++ b/test/render.js
@@ -5,3 +5,21 @@ render('Canon.mp3', function (err, buffer) {
   if (err) return err
   fs.writeFileSync('out.png', buffer)
 })
+
+var height = 256;
+render('Canon.mp3', {
+		barWidth: 1,
+		baselineWidth: 0,
+		baseline: height / 2,
+		padding: 2,
+		width: height * 4,
+		height: height,
+
+		normalizedValuesCallback: function(normalizedVals) {
+			console.log(normalizedVals)
+		}
+	},
+	function(err, buffer) {
+	  if (err) return err
+	}
+)
\ No newline at end of file