Added support for getting at the normalized bar data. Useful for thos…

…e of us who don't want to use images, but do want the data to render to canvas, etc.
drone1 · Aug 7, 2018 · 0b7d776 · 0b7d776
1 parent 5802afd
commit 0b7d776
Show file tree

Hide file tree

Showing 2 changed files with 24 additions and 0 deletions.
diff --git 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
@@ -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
+	}
+)