refactor: translate position

packages/graphics/src/components/stage/index.jsx

@@ -40,14 +40,31 @@ const Stage = forwardRef(({
             event,
             // Normalize touch events.
             (event) => {
+              let {
+                clientX,
+                clientY,
+                deltaX,
+                deltaY,
+              } = event;
               /* eslint-disable no-param-reassign */
               if (-1 !== ['touchstart', 'touchmove'].indexOf(event.type)) {
-                event.clientX = event.touches[0].clientX;
+                clientX = event.touches[0].clientX;
-                event.deltaX = event.touches[0].deltaX;
+                deltaX = event.touches[0].deltaX;
-                event.clientY = event.touches[0].clientY;
+                clientY = event.touches[0].clientY;
-                event.deltaY = event.touches[0].deltaY;
+                deltaY = event.touches[0].deltaY;
               }
               /* eslint-enable no-param-reassign */
+              const {left, top} = event.target.getBoundingClientRect();
+              Object.defineProperty(
+                event,
+                'delta',
+                {get: () => [deltaX, deltaY]},
+              );
+              Object.defineProperty(
+                event,
+                'position',
+                {get: () => [(clientX - left) / scale, (clientY - top) / scale]},
+              );
               return event;
             },
           )