add scrollTo() overloads

utility-fx-controls/src/main/java/com/dua3/utility/fx/controls/PinBoard.java

@@ -231,6 +231,19 @@ public void scrollTo(PositionInItem pos) {
         }
     }
 
+    /**
+     * Scrolls the PinBoard to the specified position within an item.
+     *
+     * @param pos the position within an item to scroll to
+     * @param relativeXinVP the relative position inside the viewport, a value between 0 and 1, i.e., 0 left, 1 right
+     * @param relativeYinVP the relative position inside the viewport, a value between 0 and 1, i.e., 0 top, 1 bottom
+     */
+    public void scrollTo(PositionInItem pos, double relativeXinVP, double relativeYinVP) {
+        if (getSkin() instanceof PinBoardSkin skin) {
+            skin.scrollTo(pos, relativeXinVP, relativeYinVP);
+        }
+    }
+
     /**
      * Scrolls the PinBoard the specified position into view.
      *

utility-fx-controls/src/main/java/com/dua3/utility/fx/controls/PinBoardSkin.java

@@ -217,6 +217,19 @@ public void scrollTo(PinBoard.PositionInItem pos) {
         scrollTo(toBoardPosition(pos));
     }
 
+    /**
+     * Scrolls the PinBoard to the position specified by {@link PinBoard.PositionInItem}.
+     *
+     * @param pos the position within an item on the PinBoard. This includes the item information
+     *            and its coordinates, relative to its area on the board.
+     * @param relativeXinVP the relative position inside the viewport, a value between 0 and 1, i.e., 0 left, 1 right
+     * @param relativeYinVP the relative position inside the viewport, a value between 0 and 1, i.e., 0 top, 1 bottom
+     */
+    public void scrollTo(PinBoard.PositionInItem pos, double relativeXinVP, double relativeYinVP) {
+        PinBoard.BoardPosition bp = toBoardPosition(pos);
+        scrollTo(bp.x(), bp.y(), relativeXinVP, relativeYinVP);
+    }
+
     /**
      * Scrolls the specified position relative to an item into the visible area of the PinBoard.
      * The method internally converts the given position to a board position and scrolls it into view.