#鸿蒙通关秘籍#如何在鸿蒙Canvas组件中使用OffscreenCanvas优化绘制速度?-鸿蒙开发者社区-51CTO.COM

#鸿蒙通关秘籍#如何在鸿蒙Canvas组件中使用OffscreenCanvas优化绘制速度?

HarmonyOS
2024-12-10 12:37:24
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Yvr第七章CRM

在鸿蒙框架中可以通过离屏绘制提高绘制效率。首先,创建一个OffscreenCanvas对象,并获取其绘制上下文。然后在离屏画布上进行绘制操作,最后通过transferToImageBitmap方法获取已绘制的图像,将其通过CanvasRenderingContext2DtransferFromImageBitmap方法绘制到主画布上。 bash @Entry @Component struct CanvasExample { private settings: RenderingContextSettings = new RenderingContextSettings(true) private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings) private offCanvas: OffscreenCanvas = new OffscreenCanvas(600, 600)

build() { Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) { Canvas(this.context) .width('100%') .height('100%') .backgroundColor('#F5DC62') .onReady(() => { let offContext = this.offCanvas.getContext("2d", this.settings) offContext.strokeRect(50, 50, 200, 150) let image = this.offCanvas.transferToImageBitmap() this.context.transferFromImageBitmap(image) }) } .width('100%') .height('100%') } }

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2024-12-10 14:02:36
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