Change rotation center

example/lib/main.dart

@@ -76,7 +76,6 @@ class _MyHomeView extends StatefulWidget {
 }
 
 class _MyHomeViewState extends State<_MyHomeView> {
-  bool isDraggableDeskShown = false;
   List<DeskPayload> desks = [];
   DeskPayload? lastModifiedObject;
 
@@ -103,18 +102,19 @@ class _MyHomeViewState extends State<_MyHomeView> {
               )
             : null,
         actions: [
-          InkWell(
-            onTap: () {
-              if (lastModifiedObject != null) {
-                desks = desks.toList()..add(lastModifiedObject!);
-                lastModifiedObject = null;
-                setState(() {});
-              }
-            },
-            child: const Center(
-              child: Text('Save'),
+          if (lastModifiedObject != null)
+            InkWell(
+              onTap: () {
+                if (lastModifiedObject != null) {
+                  desks = desks.toList()..add(lastModifiedObject!);
+                  lastModifiedObject = null;
+                  setState(() {});
+                }
+              },
+              child: const Center(
+                child: Text('Save'),
+              ),
             ),
-          ),
           InkWell(
             onTap: () {
               lastModifiedObject =

lib/src/edit_map.dart

@@ -337,8 +337,6 @@ class _DraggableDeskWidget extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return Transform.rotate(
-      origin: Offset(-commonDeskSize.width * officeMap!.ratio / 2,
-          -commonDeskSize.height * officeMap!.ratio / 2),
       angle: rotation * math.pi / 180,
       child: Container(
         padding: const EdgeInsets.all(_draggableDeskPadding),

lib/src/src/builders/graphic/desk_builder.dart

@@ -20,7 +20,7 @@ class DeskBuilder {
       params.area.position!.dy,
       rotation: params.area.rotation,
       stateType: StateType.main,
-      size: commonTabletopSize,
+      size: commonDeskSize,
       states: Params(
         params.isBooked ? bookedDeskState : defaultDeskState,
         activeDeskState,

lib/src/src/models/graphic/base_graphic.dart

@@ -28,9 +28,11 @@ abstract class BaseGraphic implements ObjectInterface {
       Offset(topLeft.dx, topLeft.dy + commonDeskSize.height),
     ];
 
+    final center = determinateRectCenter(shape);
+
     return rotation == 0
         ? shape
-        : shape.map((e) => rotatePoint(e, shape.first, rotation)).toList();
+        : shape.map((e) => rotatePoint(e, center, rotation)).toList();
   }
 
   Size getSize() {

lib/src/src/models/graphic/desk/desk.dart

@@ -46,9 +46,9 @@ class Desk extends BaseGraphic {
   void draw(Canvas canvas) {
     canvas.save();
 
-    canvas.translate(x, y);
+    canvas.translate(x + (size.width / 2), y + (size.height / 2));
     canvas.rotate(rotation * math.pi / 180);
-    canvas.translate(-(x), -(y));
+    canvas.translate(-(x + (size.width / 2)), -(y + (size.height / 2)));
 
     final DeskState state =
         stateType == StateType.active ? states.active : states.main;

lib/src/src/models/graphic/office_map.dart

@@ -103,20 +103,6 @@ class OfficeMap extends Object with IterableMixin<BaseGraphic> {
   // the center of the board in both coordinate systems. If no BoardPoint at the
   // location, return null.
   BaseGraphic? determinateSelectedObject(Offset offset) {
-    // final pointCentered = Offset(
-    //   point.dx - size.width / 2,
-    //   point.dy - size.height / 2,
-    // );
-    // final boardPoint = ObjectInterface(
-    //   ((sqrt(3) / 3 * pointCentered.dx - 1 / 3 * pointCentered.dy) /
-    //       hexagonRadius)
-    //       .round(),
-    //   ((2 / 3 * pointCentered.dy) / hexagonRadius).round(),
-    // );
-
-    // if (!_validateBoardPoint(boardPoint)) {
-    //   return null;
-    // }
     Offset point = Offset(offset.dx, offset.dy);
     BaseGraphic? selectedGraphic;
     for (final object in _mapObjects) {