HarmonyOS/OpenHarmony应用开发-ArkTS画布组件CanvasRenderingContext2D对象(四)
font、textAlign、textBaseline
font
// xxx.ets@Entry@Componentstruct Fonts { 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.font = '30px sans-serif' this.context.fillText("Hello World", 20, 60) }) } .width('100%') .height('100%') }}
textAlign
代码
// xxx.ets@Entry@Componentstruct CanvasExample { 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.strokeStyle = '#0000ff' this.context.moveTo(140, 10) this.context.lineTo(140, 160) this.context.stroke() this.context.font = '18px sans-serif' this.context.textAlign = 'start' this.context.fillText('textAlign=start', 140, 60) this.context.textAlign = 'end' this.context.fillText('textAlign=end', 140, 80) this.context.textAlign = 'left' this.context.fillText('textAlign=left', 140, 100) this.context.textAlign = 'center' this.context.fillText('textAlign=center',140, 120) this.context.textAlign = 'right' this.context.fillText('textAlign=right',140, 140) }) } .width('100%') .height('100%') }}
效果
textBaseline
代码
// xxx.ets@Entry@Componentstruct TextBaseline { 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.strokeStyle = '#0000ff' this.context.moveTo(0, 120) this.context.lineTo(400, 120) this.context.stroke() this.context.font = '20px sans-serif' this.context.textBaseline = 'top' this.context.fillText('Top', 10, 120) this.context.textBaseline = 'bottom' this.context.fillText('Bottom', 55, 120) this.context.textBaseline = 'middle' this.context.fillText('Middle', 125, 120) this.context.textBaseline = 'alphabetic' this.context.fillText('Alphabetic', 195, 120) this.context.textBaseline = 'hanging' this.context.fillText('Hanging', 295, 120) }) } .width('100%') .height('100%') }}
效果