Line: Add explicit methods for lengthening the start and end points

modules/juce_graphics/geometry/juce_Line.h

@@ -329,6 +329,16 @@ public:
                 && point.y < ((end.y - start.y) * (point.x - start.x)) / (end.x - start.x) + start.y;
     }
 
+    /** Returns a lengthened copy of this line.
+
+        This will extend the line by a certain amount by moving the start away from the end
+        (leaving the end-point the same), and return the new line.
+    */
+    Line withLengthenedStart (ValueType distanceToLengthenBy) const noexcept
+    {
+        return withShortenedStart (-distanceToLengthenBy);
+    }
+
     //==============================================================================
     /** Returns a shortened copy of this line.
 
@@ -340,6 +350,16 @@ public:
         return { getPointAlongLine (jmin (distanceToShortenBy, getLength())), end };
     }
 
+    /** Returns a lengthened copy of this line.
+
+        This will extend the line by a certain amount by moving the end away from the start
+        (leaving the start-point the same), and return the new line.
+    */
+    Line withLengthenedEnd (ValueType distanceToLengthenBy) const noexcept
+    {
+        return withShortenedEnd (-distanceToLengthenBy);
+    }
+
     /** Returns a shortened copy of this line.
 
         This will chop off part of the end of this line by a certain amount, (leaving the