HarmonyOS/OpenHarmony应用开发-ArkTS画布组件（十五）

quadraticCurveTo
quadraticCurveTo(cpx: number, cpy: number, x: number, y: number): void
创建二次贝赛尔曲线的路径。

示例：

.// xxx.ets
.@Entry
.@Component
.struct QuadraticCurveTo {
.  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.moveTo(20, 20)
.          this.context.quadraticCurveTo(100, 100, 200, 20)
.          this.context.stroke()
.      })
.    }
.    .width('100%')
.    .height('100%')
.  }
.}

arc
arc(x: number, y: number, radius: number, startAngle: number, endAngle: number, counterclockwise?: boolean): void

示例：

.// xxx.ets
.@Entry
.@Component
.struct Arc {
.  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.arc(100, 75, 50, 0, 6.28)
.          this.context.stroke()
.        })
.    }
.    .width('100%')
.    .height('100%')
.  }
.}