HarmonyOS/OpenHarmony应用开发-ArkTS画布组件（十四）

createPattern
createPattern(image: ImageBitmap, repetition: string | null): CanvasPattern | null
通过指定图像和重复方式创建图片填充的模板。

示例：

.// xxx.ets
.@Entry
.@Component
.struct CreatePattern {
.  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(() =>{
.          var pattern = this.context.createPattern(this.img, 'repeat')
.          this.context.fillStyle = pattern
.          this.context.fillRect(0, 0, 200, 200)
.        })
.    }
.    .width('100%')
.    .height('100%')
.  }
.}

bezierCurveTo
bezierCurveTo(cp1x: number, cp1y: number, cp2x: number, cp2y: number, x: number, y: number): void
创建三次贝赛尔曲线的路径。

示例：

.// xxx.ets
.@Entry
.@Component
.struct BezierCurveTo {
.  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(10, 10)
.          this.context.bezierCurveTo(20, 100, 200, 100, 200, 20)
.          this.context.stroke()
.        })
.    }
.    .width('100%')
.    .height('100%')
.  }