Apply correct normalize absmax calculation to drawBars() (#916)

katspaugh · Jan 11, 2017 · b0c0a8b · b0c0a8b
1 parent 7a9931d
commit b0c0a8b
Show file tree

Hide file tree

Showing 2 changed files with 6 additions and 2 deletions.
diff --git a/src/drawer.canvas.js b/src/drawer.canvas.js
@@ -98,7 +98,9 @@ WaveSurfer.util.extend(WaveSurfer.Drawer.Canvas, {
 
         var absmax = 1;
         if (this.params.normalize) {
-            absmax = WaveSurfer.util.max(peaks);
+            var max = WaveSurfer.util.max(peaks);
+            var min = WaveSurfer.util.min(peaks);
+            absmax = -min > max ? -min : max;
         }
 
         var scale = length / width;

diff --git a/src/drawer.multicanvas.js b/src/drawer.multicanvas.js
@@ -169,7 +169,9 @@ WaveSurfer.util.extend(WaveSurfer.Drawer.MultiCanvas, {
 
         var absmax = 1;
         if (this.params.normalize) {
-            absmax = WaveSurfer.util.max(peaks);
+            var max = WaveSurfer.util.max(peaks);
+            var min = WaveSurfer.util.min(peaks);
+            absmax = -min > max ? -min : max;
         }
 
         var scale = length / width;