1 files changed, 47 insertions, 0 deletions
diff --git a/src/main/java/com/jsyn/unitgen/Unzipper.java b/src/main/java/com/jsyn/unitgen/Unzipper.java
new file mode 100644
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--- /dev/null
+++ b/src/main/java/com/jsyn/unitgen/Unzipper.java
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+/*
+ * Copyright 2014 Phil Burk, Mobileer Inc
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.jsyn.unitgen;
+
+/**
+ * Used inside UnitGenerators for fast smoothing of inputs.
+ * 
+ * @author Phil Burk (C) 2014 Mobileer Inc
+ */
+public class Unzipper {
+    private double target;
+    private double delta;
+    private double current;
+    private int counter;
+    // About 30 msec. Power of 2 so divide should be faster.
+    private static final int NUM_STEPS = 1024;
+
+    public double smooth(double input) {
+        if (input != target) {
+            target = input;
+            delta = (target - current) / NUM_STEPS;
+            counter = NUM_STEPS;
+        }
+        if (counter > 0) {
+            if (--counter == 0) {
+                current = target;
+            } else {
+                current += delta;
+            }
+        }
+        return current;
+    }
+}