harmony 鸿蒙ImageBitmap

  • 2022-08-09
  • 浏览 (652)

ImageBitmap

An ImageBitmap object stores pixel data rendered on a canvas.

NOTE

The APIs of this module are supported since API version 8. Updates will be marked with a superscript to indicate their earliest API version.

APIs

ImageBitmap(src: string)

Since API version 9, this API is supported in ArkTS widgets.

Parameters

Name Type Mandatory Default Value Description
src string Yes - Image source. Local images are supported.
1. The string format is used to load local images, for example, ImageBitmap(“common/images/example.jpg”). The start point of the image loading path is the ets folder.
2. Supported image formats: bmp, jpg, png, svg, and webp.
NOTE
ArkTS widgets do not support the strings with the http://, datashare://, or file://data/storage.

Attributes

Name Type Description
width number Pixel width of the ImageBitmap object. The current value is 0.
Since API version 9, this API is supported in ArkTS widgets.
height number Pixel height of the ImageBitmap object. The current value is 0.
Since API version 9, this API is supported in ArkTS widgets.

Example

  // xxx.ets
  @Entry
  @Component
  struct ImageExample {
    private settings: RenderingContextSettings = new RenderingContextSettings(true)
    private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)
    private img:ImageBitmap = new ImageBitmap("common/images/example.jpg")

    build() {
      Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
        Canvas(this.context)
          .width('100%')
          .height('100%')
          .backgroundColor('#ffff00')
          .onReady(() =>{
            this.context.drawImage( this.img,0,0,500,500,0,0,400,200)
        })
      }
      .width('100%')
      .height('100%')
    }
  }

en-us_image_0000001194352442

Methods

close

close()

Releases all graphics resources associated with this ImageBitmap object and sets its width and height to 0.

Since API version 9, this API is supported in ArkTS widgets.

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