1# RotationGesture
2
3**RotationGesture** is used to trigger a rotation gesture, which requires two to five fingers with a minimum 1-degree rotation angle.
4
5>  **NOTE**
6>
7>  This gesture is supported since API version 7. Updates will be marked with a superscript to indicate their earliest API version.
8
9
10## APIs
11
12RotationGesture(value?: { fingers?: number, angle?: number })
13
14**Atomic service API**: This API can be used in atomic services since API version 11.
15
16**Parameters**
17
18| Name| Type| Mandatory| Description|
19| -------- | -------- | -------- | -------- |
20| fingers | number | No| Minimum number of fingers to trigger a rotation. The value ranges from 2 to 5.<br>Default value: **2**<br>While more fingers than the minimum number can be pressed to trigger the gesture, only the first two fingers participate in gesture calculation.|
21| angle | number | No| Minimum degree that can trigger the rotation gesture.<br>Default value: **1**<br>**NOTE**<br>If the value is less than or equal to 0 or greater than 360, it will be converted to the default value.|
22
23
24## Events
25
26| Name | Description|
27| -------- | -------- |
28| onActionStart(event:(event: [GestureEvent](ts-gesture-settings.md#gestureevent)) =&gt; void) | Triggered when a rotation gesture is recognized.<br>**Atomic service API**: This API can be used in atomic services since API version 11.|
29| onActionUpdate(event:(event: [GestureEvent](ts-gesture-settings.md#gestureevent)) =&gt; void) | Triggered when the user moves the finger in a rotation gesture on the screen.<br>**Atomic service API**: This API can be used in atomic services since API version 11.|
30| onActionEnd(event:(event: [GestureEvent](ts-gesture-settings.md#gestureevent)) =&gt; void) | Triggered when the finger used for the rotation gesture is lifted.<br>**Atomic service API**: This API can be used in atomic services since API version 11.|
31| onActionCancel(event: () =&gt; void) | Triggered when a tap cancellation event is received after the rotation gesture is recognized.<br>**Atomic service API**: This API can be used in atomic services since API version 11.|
32
33## Attributes
34
35| Name| Type   |Description                                       |
36| ----  | ------  | ---------------------------------------- |
37| tag<sup>11+</sup>   | string  | Tag for the rotation gesture. It is used to distinguish the gesture during custom gesture judgment.<br>**Atomic service API**: This API can be used in atomic services since API version 11.|
38| allowedTypes<sup>14+</sup> | Array\<[SourceTool](ts-gesture-settings.md#sourcetool9)> | Allowed event input types for the rotation gesture.<br>**Atomic service API**: This API can be used in atomic services since API version 14.|
39
40## Example
41
42This example demonstrates the recognition of a two-finger rotation gesture using **RotationGesture**.
43
44```ts
45// xxx.ets
46@Entry
47@Component
48struct RotationGestureExample {
49  @State angle: number = 0
50  @State rotateValue: number = 0
51
52  build() {
53    Column() {
54      Column() {
55        Text('RotationGesture angle:' + this.angle)
56      }
57      .height(200)
58      .width(300)
59      .padding(20)
60      .border({ width: 3 })
61      .margin(80)
62      .rotate({ angle: this.angle })
63      // The gesture event is triggered by rotating with two fingers.
64      .gesture(
65      RotationGesture()
66        .onActionStart((event: GestureEvent) => {
67          console.info('Rotation start')
68        })
69        .onActionUpdate((event: GestureEvent) => {
70          if (event) {
71            this.angle = this.rotateValue + event.angle
72          }
73        })
74        .onActionEnd((event: GestureEvent) => {
75          this.rotateValue = this.angle
76          console.info('Rotation end')
77        })
78      )
79    }.width('100%')
80  }
81}
82```
83
84 ![en-us_image_0000001174264372](figures/en-us_image_0000001174264372.png)
85