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diff --git a/src/main/java/com/jsyn/swing/XYController.java b/src/main/java/com/jsyn/swing/XYController.java
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+/*
+ * Copyright 1997 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.swing;
+
+import javax.swing.JPanel;
+
+/**
+ * Root class for 2 dimensional X,Y controller for wave editors, Theremins, etc. Maps pixel
+ * coordinates into "world" coordinates.
+ *
+ * @author (C) 1997 Phil Burk, SoftSynth.com
+ */
+
+public class XYController extends JPanel {
+    double minWorldX = 0.0;
+    double maxWorldX = 1.0;
+    double minWorldY = 0.0;
+    double maxWorldY = 1.0;
+
+    public XYController() {
+    }
+
+    public XYController(double minWX, double minWY, double maxWX, double maxWY) {
+        setMinWorldX(minWX);
+        setMaxWorldX(maxWX);
+        setMinWorldY(minWY);
+        setMaxWorldY(maxWY);
+    }
+
+    /**
+     * Set minimum World coordinate value for the horizontal X dimension. The minimum value
+     * corresponds to the left of the component.
+     */
+    public void setMinWorldX(double minWX) {
+        minWorldX = minWX;
+    }
+
+    public double getMinWorldX() {
+        return minWorldX;
+    }
+
+    /**
+     * Set maximum World coordinate value for the horizontal X dimension. The minimum value
+     * corresponds to the right of the component.
+     */
+    public void setMaxWorldX(double maxWX) {
+        maxWorldX = maxWX;
+    }
+
+    public double getMaxWorldX() {
+        return maxWorldX;
+    }
+
+    /**
+     * Set minimum World coordinate value for the vertical Y dimension. The minimum value
+     * corresponds to the bottom of the component.
+     */
+    public void setMinWorldY(double minWY) {
+        minWorldY = minWY;
+    }
+
+    public double getMinWorldY() {
+        return minWorldY;
+    }
+
+    /**
+     * Set maximum World coordinate value for the vertical Y dimension. The maximum value
+     * corresponds to the top of the component.
+     */
+    public void setMaxWorldY(double maxWY) {
+        maxWorldY = maxWY;
+    }
+
+    public double getMaxWorldY() {
+        return maxWorldY;
+    }
+
+    /** Convert from graphics coordinates (pixels) to world coordinates. */
+    public double convertGXtoWX(int gx) {
+        int width = getWidth();
+        return minWorldX + ((maxWorldX - minWorldX) * gx) / width;
+    }
+
+    public double convertGYtoWY(int gy) {
+        int height = getHeight();
+        return minWorldY + ((maxWorldY - minWorldY) * (height - gy)) / height;
+    }
+
+    /** Convert from world coordinates to graphics coordinates (pixels). */
+    public int convertWXtoGX(double wx) {
+        int width = getWidth();
+        return (int) (((wx - minWorldX) * width) / (maxWorldX - minWorldX));
+    }
+
+    public int convertWYtoGY(double wy) {
+        int height = getHeight();
+        return height - (int) (((wy - minWorldY) * height) / (maxWorldY - minWorldY));
+    }
+
+    /** Clip wx to the min and max World X values. */
+    public double clipWorldX(double wx) {
+        if (wx < minWorldX)
+            wx = minWorldX;
+        else if (wx > maxWorldX)
+            wx = maxWorldX;
+        return wx;
+    }
+
+    /** Clip wy to the min and max World Y values. */
+    public double clipWorldY(double wy) {
+        if (wy < minWorldY)
+            wy = minWorldY;
+        else if (wy > maxWorldY)
+            wy = maxWorldY;
+        return wy;
+    }
+
+}