#创作者激励#HarmonyOS/OpenHarmony应用开发ArkTS画布组件（三） 原创

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HarmonyOS/OpenHarmony应用开发-ArkTS画布组件-CanvasRenderingContext2D对象（三）
::: hljs-center

lineCap、lineJoin、miterLimit

:::
lineCap
代码：

// xxx.ets
@Entry
@Component
struct LineCapExample {
  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.lineWidth = 8
          this.context.beginPath()
          this.context.lineCap = 'round'
          this.context.moveTo(30, 50)
          this.context.lineTo(220, 50)
          this.context.stroke()
        })
    }
    .width('100%')
    .height('100%')
  }
}

效果

lineJoin
代码

// xxx.ets
@Entry
@Component
struct LineJoinExample {
  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.beginPath()
        this.context.lineWidth = 8
        this.context.lineJoin = 'miter'
        this.context.moveTo(30, 30)
        this.context.lineTo(120, 60)
        this.context.lineTo(30, 110)
        this.context.stroke()
      })
    }
    .width('100%')
    .height('100%')
  }
}

效果：

miterLimit
代码

// xxx.ets
@Entry
@Component
struct MiterLimit {
  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.lineWidth = 8
          this.context.lineJoin = 'miter'
          this.context.miterLimit = 3
          this.context.moveTo(30, 30)
          this.context.lineTo(60, 35)
          this.context.lineTo(30, 37)
          this.context.stroke()
      })
    }
    .width('100%')
    .height('100%')
  }
}

效果