[原创]书写不再“断片”！Pen Kit报点预测丝滑如真笔-HarmonyOS-看雪安全社区

传统手写场景中，用户常因笔尖滞后、轨迹抖动等问题导致书写体验割裂，而开发者则面临跨设备适配复杂、算法优化成本高等痛点。

HarmonyOS SDK[手写笔服务](2efK9s2c8@1M7s2y4Q4x3@1q4Q4x3V1k6Q4x3V1k6V1k6i4k6W2L8r3!0H3k6i4u0Q4x3X3g2Z5N6h3q4%4k6h3W2Q4x3X3g2U0L8$3#2Q4x3V1k6U0L8$3&6K6N6h3#2W2M7W2)9J5c8X3y4F1i4K6u0r3M7$3c8C8i4K6u0r3M7r3g2F1i4K6u0V1K9$3W2@1i4K6u0r3i4K6y4r3K9r3q4Q4y4h3k6K6L8%4g2J5j5$3g2Q4x3@1c8Z5L8i4x3I4K9s2c8@1M7s2y4Q4x3@1q4Q4x3V1k6Q4x3V1k6V1k6i4k6W2L8r3!0H3k6i4u0Q4x3X3g2Z5N6h3q4%4k6h3W2Q4x3X3g2U0L8$3#2Q4x3V1k6U0L8$3&6K6N6h3#2W2M7W2)9J5c8X3y4F1i4K6u0r3M7$3c8C8i4K6u0r3M7r3g2F1i4K6u0V1K9$3W2@1i4K6u0r3i4K6y4r3K9r3q4Q4y4h3k6K6L8%4g2J5j5$3g2Q4x3@1c8Z5L8i4x3I4 "手写笔服务")（Pen Kit）提供[报点预测能力](b59K9s2c8@1M7s2y4Q4x3@1q4Q4x3V1k6Q4x3V1k6V1k6i4k6W2L8r3!0H3k6i4u0Q4x3X3g2Z5N6h3q4%4k6h3W2Q4x3X3g2U0L8$3#2Q4x3V1k6U0L8$3&6K6N6h3#2W2M7W2)9J5c8X3y4F1i4K6u0r3k6r3!0U0i4K6u0r3K9r3q4J5L8h3!0F1P5h3!0K6i4K6u0V1k6%4g2A6k6r3g2K6i4K6u0r3M7r3g2F1i4K6u0V1M7r3!0A6L8Y4c8Q4x3X3c8H3M7X3g2V1K9h3y4@1K9h3!0F1i4K6y4r3K9r3q4Q4y4h3k6K6L8%4g2J5j5$3g2Q4x3@1c8Z5L8i4x3I4 "报点预测能力")，根据书写轨迹预测报点提前进行绘制，提高手写跟手性，手写套件已默认开启报点预测，您也可以在应用中单独集成报点预测功能。

![](upload/attach/202508/930821_U27RPYYTN6PBYG5.png)

在应用的自定义界面中，获取到界面的触摸事件，通过调用报点预测的接口，可以得到预测的下一个报点的位置信息。

![](upload/attach/202508/930821_8FCBYVNG4NB5GE8.png)

**应用场景**

教育创作：提升涂鸦场景的跟手性。

**开发步骤**

1. 导入相关模块。

`import { PointPredictor } from '@kit.Penkit';`

2. 获取当前界面的触摸事件信息，调用接口计算预测点信息。
````
    @Entry
    @Component
    struct PointPredictorDemo {
      @State actualXCoordinate: number = 0
      @State actualYCoordinate: number = 0
      @State predictorXCoordinate: Dimension = 0
      @State predictorYCoordinate: Dimension = 0
      pointPredictor: PointPredictor = new PointPredictor();

aboutToAppear() {
        console.info('getPredictionPoint aboutToAppear')
      }

aboutToDisappear() {
        console.info('getPredictionPoint aboutToDisappear')
      }

build() {
        Stack({ alignContent: Alignment.TopEnd }) {
          this.Canvas() // Canvas.
        }.height('100%').width('100%')
      }

// 画布
      @Builder
      Canvas() {
        Column() {
          Text("实际点坐标： X: " + this.actualXCoordinate + " Y: " + this.actualYCoordinate).textAlign(TextAlign.Start)
          Text("预测点坐标： X: " + this.predictorXCoordinate + " Y: " + this.predictorYCoordinate)
            .textAlign(TextAlign.Start)
        }.position({ x: 0, y: 0 })
        .alignItems(HorizontalAlign.Start)

Stack()
          .width('100%')
          .height('100%')
          .onTouch((event: TouchEvent) => {
            switch (event.type) {
              case TouchType.Down: // Create a drawing path when the screen is touched.
                break;
              case TouchType.Move: // Use the prediction algorithm to perform prediction and obtain the prediction point.
                let point = this.pointPredictor?.getPredictionPoint(event)
                this.actualXCoordinate = event.touches[0]?.x
                this.actualYCoordinate = event.touches[0]?.y
                this.predictorXCoordinate = point?.x
                this.predictorYCoordinate = point?.y
                console.info("pointPredictor 实际点坐标 x:" + event.touches[0]?.x + " y:" + event.touches[0]?.y)
                console.info("pointPredictor 预测点坐标 x:" + point?.x + "  y:" + point?.y)
                break;
              case TouchType.Up:
                break;
            }
          })
      }
    }
````

**了解更多详情\>\>**

访问[手写笔服务官网](836K9s2c8@1M7s2y4Q4x3@1q4Q4x3V1k6Q4x3V1k6V1k6i4k6W2L8r3!0H3k6i4u0Q4x3X3g2Z5N6h3q4%4k6h3W2Q4x3X3g2U0L8$3#2Q4x3V1k6U0L8$3&6K6N6h3#2W2M7W2)9J5c8X3y4F1i4K6u0r3M7$3c8C8i4K6u0r3M7r3g2F1i4K6u0V1K9$3W2@1i4K6u0r3i4K6y4r3K9r3q4Q4y4h3k6K6L8%4g2J5j5$3g2Q4x3@1c8Z5L8i4x3I4 "手写笔服务官网")

获取[报点预测开发指导文档](38dK9s2c8@1M7s2y4Q4x3@1q4Q4x3V1k6Q4x3V1k6V1k6i4k6W2L8r3!0H3k6i4u0Q4x3X3g2Z5N6h3q4%4k6h3W2Q4x3X3g2U0L8$3#2Q4x3V1k6U0L8$3&6K6N6h3#2W2M7W2)9J5c8X3y4F1i4K6u0r3k6r3!0U0i4K6u0r3K9r3q4J5L8h3!0F1P5h3!0K6i4K6u0V1k6%4g2A6k6r3g2K6i4K6u0r3M7r3g2F1i4K6u0V1M7r3!0A6L8Y4c8Q4x3X3c8H3M7X3g2V1K9h3y4@1K9h3!0F1i4K6y4r3K9r3q4Q4y4h3k6K6L8%4g2J5j5$3g2Q4x3@1c8Z5L8i4x3I4 "报点预测开发指导文档")

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最后于 2025-8-30 11:29 被HarmonyOS SDK编辑，原因：

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