Merge pull request #25 from stevehjohn/temp

Temp

src/Zen.Desktop.Host/Features/WaveVisualiser.cs

@@ -16,6 +16,8 @@ public class WaveVisualiser
 
     private readonly float[][] _buffers;
 
+    private readonly float[] _centreBuffer;
+
     private readonly Texture2D _waves;
 
     private int _bufferPosition;
@@ -40,6 +42,8 @@ public WaveVisualiser(GraphicsDeviceManager graphicsDeviceManager)
         {
             _buffers[i] = new float[BufferSize];
         }
+
+        _centreBuffer = new float[BufferSize];
     }
 
     public void ReceiveSignals(float[] signals)
@@ -102,17 +106,15 @@ private void RenderChannel(int channel)
 
         var axis = channel == 3 ? height * width * channel + height * width / 2 : height * width * (channel + 1) - width;
 
-        var buffer = _buffers[channel];
-
-        var length = buffer.Length;
+        CentreChannel(_buffers[channel]);
 
         var lastOffset = 0;
 
         var color = channel == 3 ? Color.Blue : Color.Green;
 
         for (var x = 0; x < width; x++)
         {
-            var dataPoint = buffer[(int) (x * ((float) length / width))];
+            var dataPoint = _centreBuffer[(int) (x * ((float) BufferSize / width))];
 
             var offset = -(int) (dataPoint * height * (channel == 3 ? 1 : 4));
 
@@ -131,4 +133,28 @@ private void RenderChannel(int channel)
             lastOffset = offset;
         }
     }
+
+    private void CentreChannel(float[] buffer)
+    {
+        var max = float.MinValue;
+
+        var maxPos = int.MinValue;
+
+        for (var i = 0; i < BufferSize; i++)
+        {
+            if (buffer[i] > max)
+            {
+                max = buffer[i];
+
+                maxPos = i;
+            }
+        }
+
+        var startPos = BufferSize / 2 + maxPos;
+
+        for (var i = 0; i < BufferSize; i++)
+        {
+            _centreBuffer[i] = buffer[(startPos + i) % BufferSize];
+        }
+    }
 }