#鸿蒙通关秘籍#如何在鸿蒙中实现动画与手势的流畅衔接？

在鸿蒙中实现动画与手势的流畅衔接，使用springMotion曲线可以保证离手阶段的动画速度继承于跟手阶段。下面是一个小球跟随手指移动的完整实现：

import { curves } from '@kit.ArkUI';

@Entry
@Component
struct SpringMotionDemo {
  @State positionX: number = 100;
  @State positionY: number = 100;
  diameter: number = 50;

  build() {
    Column() {
      Row() {
        Circle({ width: this.diameter, height: this.diameter })
          .fill(Color.Blue)
          .position({ x: this.positionX, y: this.positionY })
          .onTouch((event?: TouchEvent) => {
            if(event){
              if (event.type === TouchType.Move) {
                animateTo({ curve: curves.responsiveSpringMotion() }, () => {
                  this.positionX = event.touches[0].windowX - this.diameter / 2;
                  this.positionY = event.touches[0].windowY - this.diameter / 2;
                })
              } else if (event.type === TouchType.Up) {
                animateTo({ curve: curves.springMotion() }, () => {
                  this.positionX = 100;
                  this.positionY = 100;
                })
              }
            }
          })
      }
      .width("100%").height("80%")
      .clip(true)
      .backgroundColor(Color.Orange)

      Flex({ direction: FlexDirection.Row, alignItems: ItemAlign.Start, justifyContent: FlexAlign.Center }) {
        Text("拖动小球").fontSize(16)
      }
      .width("100%")

      Row() {
        Text('点击位置: [x: ' + Math.round(this.positionX) + ', y:' + Math.round(this.positionY) + ']').fontSize(16)
      }
      .padding(10)
      .width("100%")
    }.height('100%').width('100%')
  }
}