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HarmonyOS/OpenHarmony应用开发-ArkTS画布组件(十)
鸿蒙时代
发布于 2023-4-6 10:08
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clearRect fillText strokeText
clearRect
clearRect(x: number, y: number, w: number, h: number): void
删除指定区域内的绘制内容。
参数:
示例:
// xxx.ets
@Entry
@Component
struct ClearRect {
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.fillStyle = 'rgb(0,0,255)'
this.context.fillRect(20,20,200,200)
this.context.clearRect(30,30,150,100)
})
}
.width('100%')
.height('100%')
}
}
fillText
fillText(text: string, x: number, y: number, maxWidth?: number): void
绘制填充类文本。
参数:
示例:
// xxx.ets
@Entry
@Component
struct FillText {
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, 100)
})
}
.width('100%')
.height('100%')
}
}
strokeText
strokeText(text: string, x: number, y: number, maxWidth?:number): void
绘制描边类文本。
参数:
示例:
// xxx.ets
@Entry
@Component
struct StrokeText {
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 = '55px sans-serif'
this.context.strokeText("Hello World!", 20, 60)
})
}
.width('100%')
.height('100%')
}
}
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HarmonyOSOpenHarmony应用开发-ArkTS画布组.docx 335.46K 24次下载
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