Разработка приложений HarmonyOS/OpenHarmony — компонент холста ArkTS Объект CanvasRenderingContext2D (8)

shadowOffsetY

код

// xxx.ets
@Entry
@Component
struct ShadowOffsetY {
  private settings: RenderingContextSettings = new RenderingContextSettings(true)
  private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)
  build() {
    Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
      Canvas(this.context)
        .width('100%')
        .height('100%')
        .backgroundColor('#ffff00')
        .onReady(() =>{
          this.context.shadowBlur = 10
          this.context.shadowOffsetY = 20
          this.context.shadowColor = 'rgb(0,0,0)'
          this.context.fillStyle = 'rgb(255,0,0)'
          this.context.fillRect(30, 30, 100, 100)
      })
    }
    .width('100%')
    .height('100%')
  }
}

Эффект

imageSmoothingEnabled

код

// xxx.ets
@Entry
@Component
struct ImageSmoothingEnabled {
  private settings: RenderingContextSettings = new RenderingContextSettings(true)
  private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)
  private img:ImageBitmap = new ImageBitmap("common/images/icon.jpg")
  
  build() {
    Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
      Canvas(this.context)
        .width('100%')
        .height('100%')
        .backgroundColor('#ffff00')
        .onReady(() =>{
          this.context.imageSmoothingEnabled = false
          this.context.drawImage( this.img,0,0,400,200)
      })
    }
    .width('100%')
    .height('100%')
  }
}

 Эффект