configurable min/max value for knob

lib/Knob/index.js

@@ -54,6 +54,36 @@ exports.initialize = function(ctx, k, theme) {
                     this._redraw();
 
                 },
+
+                setMinValue: function(min) {
+
+                    if (min === this._minValue) {
+                        return;
+                    }
+
+                    this._minValue = min;
+                    if (this._value < min) {
+                        this._value = min;
+                    }
+
+                    this._redraw();
+
+                },
+
+                setMaxValue: function(max) {
+
+                    if (max === this._maxValue) {
+                        return;
+                    }
+
+                    this._maxValue = max;
+                    if (this._value > max) {
+                        this._value = max;
+                    }
+
+                    this._redraw();
+
+                },
 
                 _buildStructure: function() {