harmony 鸿蒙传统曲线

2023-10-30
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传统曲线

传统曲线基于数学公式，创造形状符合开发者预期的动画曲线。以三阶贝塞尔曲线为代表，通过调整曲线控制点，可以改变曲线形状，从而带来缓入、缓出等动画效果。对于同一条传统曲线，由于不具备物理含义，其形状不会因为用户行为发生任何改变，缺少物理动画的自然感和生动感。建议优先采用物理曲线创建动画，将传统曲线作为辅助用于极少数必要场景中。

ArkUI提供了贝塞尔曲线、阶梯曲线等传统曲线接口，开发者可参照插值计算进行查阅。

传统曲线的示例和效果如下：

class MyCurve {
  public title: string;
  public curve: Curve;
  public color: Color|string;

  constructor(title: string, curve: Curve, color: Color|string = '') {
    this.title = title;
    this.curve = curve;
    this.color = color;
  }
}

const myCurves: MyCurve[] = [
  new MyCurve(' Linear', Curve.Linear, 0x409EFF),
  new MyCurve(' Ease', Curve.Ease, 0x67C23A),
  new MyCurve(' EaseIn', Curve.EaseIn, 0xE6A23C),
  new MyCurve(' EaseOut', Curve.EaseOut, 0xF56C6C),
  new MyCurve(' EaseInOut', Curve.EaseInOut, 0xFFB6C1),
  new MyCurve(' FastOutSlowIn', Curve.FastOutSlowIn, 0xDC143C),
  new MyCurve(' LinearOutSlowIn', Curve.LinearOutSlowIn, 0xFF00FF),
  new MyCurve(' FastOutLinearIn', Curve.FastOutLinearIn, 0x00BFFF),
  new MyCurve(' ExtremeDeceleration', Curve.ExtremeDeceleration, 0x5F9EA0),
  new MyCurve(' Sharp', Curve.Sharp, 0x00FFFF),
  new MyCurve(' Rhythm', Curve.Rhythm, 0x66CDAA),
  new MyCurve(' Smooth', Curve.Smooth, 0x7CFC00),
  new MyCurve(' Friction', Curve.Friction, 0xFFA500)
]

@Entry
@Component
export struct CurveDemo {
  @State dRotate: number = 0; // 旋转角度

  build() {
    Column() {
      // 曲线图例
      Grid() {
        ForEach(myCurves, (item: MyCurve) => {
          GridItem() {
            Column() {
              Row()
                .width(20)
                .height(20)
                .borderRadius(10)
                .backgroundColor(item.color)
              Text(item.title)
                .fontSize(10)
                .fontColor(0x909399)
            }
            .width('100%')
          }
        })
      }
      .columnsTemplate('1fr 1fr 1fr')
      .rowsTemplate('1fr 1fr 1fr 1fr 1fr')
      .padding(10)
      .width('100%')
      .height(300)

      Stack() {
        // 摆动管道
        Row()
          .width(290)
          .height(290)
          .border({
            width: 10,
            color: 0xE6E8EB,
            radius: 145
          })

        ForEach(myCurves, (item: MyCurve) => {
          // 小球
          Column() {
            Row()
              .width(20)
              .height(20)
              .borderRadius(10)
              .backgroundColor(item.color)
          }
          .width(20)
          .height(300)
          .rotate({ angle: this.dRotate })
          .animation({ duration: 2000, iterations: -1, curve: item.curve, delay: 100 })
        })
      }
      .width('100%')
      .height(437)
      .onClick(() => {
        this.dRotate ? null : this.dRotate = 360;
      })
    }
    .width('100%')
  }
}

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