1# Motion Blur 2 3You can apply a motion blur effect to a component being scaled or moved. This effect must be used together with the **onFinish** parameter of **AnimateParam**. 4 5> **NOTE** 6> 7> The initial APIs of this module are supported since API version 12. Updates will be marked with a superscript to indicate their earliest API version. 8 9## motionBlur 10 11motionBlur(value: MotionBlurOptions) 12 13Apply a motion blur effect to the component being scaled or moved. 14 151. Do not use this API in intra-component transitions, shared element transitions, implicit element transitions, or particle animations. Doing so may cause unexpected results. 16 172. The **radius** parameter of **motionBlur** must be set to **0** for the initial state. Otherwise, there may be unexpected results during a cold start. 18 193. This API must be used together with the **onFinish** parameter of **AnimateParam**. Its **radius** parameter must be set to **0** when the animation ends; otherwise, there may be unexpected results. 20 214. When using this API, do not frequently change the blur radius of the same component; otherwise, there may be unexpected results. For example, if you frequently click the image in the example, the blur effect may not work sometimes. 22 235. To avoid unexpected results, make sure the coordinates of the motion blur anchor point are the same as those of the animation scaling anchor point. 24 256. To avoid unexpected results, set the blur radius to a value less than 1. 26 27**Atomic service API**: This API can be used in atomic services since API version 12. 28 29**Parameters** 30 31| Name| Type | Mandatory| Description | 32| ------ | ----------------------------------------------- | ---- | ------------------ | 33| value | [MotionBlurOptions](#motionbluroptions) | Yes | Motion blur options.| 34 35## motionBlur<sup>18+</sup> 36 37motionBlur(motionBlur: Optional\<MotionBlurOptions>) 38 39Apply a motion blur effect to the component being scaled or moved. Compared to [motionBlur](#motionblur), this API supports the **undefined** type for the **motionBlur** parameter. 40 411. Do not use this API in intra-component transitions, shared element transitions, implicit element transitions, or particle animations. Doing so may cause unexpected results. 42 432. The **radius** parameter of **motionBlur** must be set to **0** for the initial state. Otherwise, there may be unexpected results during a cold start. 44 453. This API must be used together with the **onFinish** parameter of **AnimateParam**. Its **radius** parameter must be set to **0** when the animation ends; otherwise, there may be unexpected results. 46 474. When using this API, do not frequently change the blur radius of the same component; otherwise, there may be unexpected results. For example, if you frequently click the image in the example, the blur effect may not work sometimes. 48 495. To avoid unexpected results, make sure the coordinates of the motion blur anchor point are the same as those of the animation scaling anchor point. 50 516. To avoid unexpected results, set the blur radius to a value less than 1. 52 53**Atomic service API**: This API can be used in atomic services since API version 18. 54 55**Parameters** 56 57| Name | Type | Mandatory | Description | 58| ---------- | ---------------------------------------------------------- | ---- | ------------------------------------------------------------ | 59| motionBlur | Optional\<[MotionBlurOptions](#motionbluroptions)> | Yes | Motion blur options.<br>If **motionBlur** is set to **undefined**, the previous value is retained.| 60 61## MotionBlurOptions 62 63**Atomic service API**: This API can be used in atomic services since API version 12. 64 65| Name | Type | Mandatory | Description | 66| ------------- | ----------------------------------------------------------- | ----- | ------------------------------------------------------------ | 67| radius | number | Yes | Blur radius. The value range is [0.0, ∞). You are advised to set it to a value less than 1.0.| 68| anchor | [MotionBlurAnchor](#motionbluranchor) | Yes | Coordinates of the motion blur anchor point. They must be the same as those of the animation scaling anchor point.| 69 70## MotionBlurAnchor 71 72**Atomic service API**: This API can be used in atomic services since API version 12. 73 74| Name | Type | Mandatory | Description | 75| ------------- | ----------------------------------------------------------- | ----- | ------------------------------------------------------------ | 76| x | number | Yes | X-coordinate of the anchor point. The value range is [0.0, 1.0].| 77| y | number | Yes | Y-coordinate of the anchor point. The value range is [0.0, 1.0].| 78 79## Example 80 81This example demonstrates how to apply a motion blur effect. 82```ts 83// xxx.ets 84import { curves } from '@kit.ArkUI'; 85 86@Entry 87@Component 88struct motionBlurTest { 89 @State widthSize: number = 400 90 @State heightSize: number = 320 91 @State flag: boolean = true 92 @State radius: number = 0 93 @State x: number = 0 94 @State y: number = 0 95 96 build() { 97 Column() { 98 Column() { 99 Image($r('app.media.testImg')) 100 .width(this.widthSize) 101 .height(this.heightSize) 102 .onClick(() => { 103 this.radius = 5; 104 this.x = 0.5; 105 this.y = 0.5; 106 if (this.flag) { 107 this.widthSize = 100; 108 this.heightSize = 80; 109 } else { 110 this.widthSize = 400; 111 this.heightSize = 320; 112 } 113 this.flag = !this.flag; 114 }) 115 .animation({ 116 duration: 2000, 117 curve: curves.springCurve(10, 1, 228, 30), 118 onFinish: () => { 119 this.radius = 0; 120 } 121 }) 122 .motionBlur({ radius: this.radius, anchor: { x: this.x, y: this.y } }) 123 } 124 }.width('100%').margin({ top: 5 }) 125 } 126} 127``` 128 129 130
