update zh-cn/application-dev/reference/arkui-ts/ts-basic-gestures-rotationgesture.md.

Signed-off-by: Nluoying_ace <luoying19@huawei.com>

zh-cn/application-dev/reference/arkui-ts/ts-basic-gestures-rotationgesture.md

@@ -16,7 +16,7 @@ RotationGesture(value?: { fingers?: number, angle?: number })
 | 参数名称 | 参数类型 | 必填 | 参数描述 |
 | -------- | -------- | -------- | -------- |
 | fingers | number | 否 | 触发旋转的最少手指数,&nbsp;最小为2指，最大为5指。<br/>默认值：2 |
-| angle | number | 否 | 触发旋转手势的最小改变度数，单位为deg。<br/>默认值：1.0 |
+| angle | number | 否 | 触发旋转手势的最小改变度数，单位为deg。<br/>默认值：1 |
 
 
 ## 事件
@@ -36,26 +36,35 @@ RotationGesture(value?: { fingers?: number, angle?: number })
 @Entry
 @Component
 struct RotationGestureExample {
-  @State angle: number = 0
+  @State angle: number = 0;
+  @State rotateValue: number = 0;
 
   build() {
-    Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.SpaceBetween }) {
-      Text('RotationGesture angle:' + this.angle)
-    }
-    .height(100).width(200).padding(20).border({ width:1 })
-    .margin(80).rotate({ x:1, y:2, z:3, angle: this.angle })
-    .gesture(
+    Column() {
+      Column() {
+        Text('RotationGesture angle:' + this.angle)
+      }
+      .height(200)
+      .width(300)
+      .padding(20)
+      .border({ width: 3 })
+      .margin(80)
+      .rotate({ angle: this.angle })
+      // 双指旋转触发该手势事件
+      .gesture(
       RotationGesture()
         .onActionStart((event: GestureEvent) => {
-          console.log('Rotation start')
+          console.info('Rotation start');
         })
         .onActionUpdate((event: GestureEvent) => {
-          this.angle = event.angle
+          this.angle = this.rotateValue + event.angle;
         })
         .onActionEnd(() => {
-          console.log('Rotation end')
+          this.rotateValue = this.angle;
+          console.info('Rotation end');
         })
-    )
+      )
+    }.width('100%')
   }
 }
 ```