@@ -14,4 +14,6 @@
 @property (nonatomic, readwrite, strong) CPTFill *lineFill;
 @property (nonatomic, readwrite, strong) CPTGradient *lineGradient;
 
++ (instancetype)lineStyleWithStyle:(CPTLineStyle*)lineStyle;
+
 @end
@@ -58,4 +58,28 @@ @implementation CPTMutableLineStyle
  **/
 @dynamic lineGradient;
 
+/** @brief Creates and returns a new CPTMutableLineStyle instance initialized from an existing CPTLineStyle.
+ *
+ *  The line style will be initalized with values from the given lineStyle, useful to create
+ *  a mutable copy from an immutable instance.
+ *
+ *  @param lineStyle An existing CPTLineStyle.
+ *  @return A new CPTMutableLineStyle instance.
+ **/
++ (instancetype)lineStyleWithStyle:(CPTLineStyle*)lineStyle
+{
+    CPTMutableLineStyle *newStyle = [[CPTMutableLineStyle alloc] init];
+    newStyle.dashPattern = [NSArray arrayWithArray:lineStyle.dashPattern];
+    newStyle.lineCap = lineStyle.lineCap;
+    newStyle.lineColor = lineStyle.lineColor;
+    newStyle.lineFill = lineStyle.lineFill;
+    newStyle.lineGradient = lineStyle.lineGradient;
+    newStyle.lineJoin = lineStyle.lineJoin;
+    newStyle.lineWidth = lineStyle.lineWidth;
+    newStyle.miterLimit = lineStyle.miterLimit;
+    newStyle.patternPhase = lineStyle.patternPhase;
+    
+    return newStyle;
+}
+
 @end