图片拼接鸿蒙示例代码

 export async function joinImages(images: Array<string>, isH = true) {
  try {
    if (images.length < 2) {
      return;
    }
    获取图片信息
    ...
    
    根据要拼接图片创建拼接后的pixelMap
    const combineColor = new ArrayBuffer(combineOpts.size.width * combineOpts.size.height * 4);
    const newPixelMap = await image.createPixelMap(combineColor, combineOpts);
    for (let x = 0; x < images.length; x++) {
      const singleOpts = x === 0 ? singleOpts1 : singleOpts2
      let singleColor = new ArrayBuffer(singleOpts.desiredSize!.width * singleOpts.desiredSize!.height * 4);
      let imageSource = x === 0 ? imageSource1 : imageSource2
      let singleWidth = x === 0 ? singleWidth1 : singleWidth2
      let singleHeight = x === 0 ? singleHeight1 : singleHeight2
      //读取小图
      const singlePixelMap = await imageSource.createPixelMap(singleOpts);
      await singlePixelMap.readPixelsToBuffer(singleColor);
      //写入大图
      let area: image.PositionArea = {
        pixels: singleColor,
        offset: 0,
        stride: singleWidth * 4,
        region: {
          size: { height: singleHeight, width: singleWidth },
          x: isH ? x === 0 ? 0 : singleWidth1 : 0,
          y: isH ? 0 : x === 0 ? 0 : singleHeight1
        }
      }
      await newPixelMap.writePixels(area);
    }
    return newPixelMap;
  } catch (err) {
    hilog.error(0x0000, 'JOIN_IMAGES', 'PictureJoinTogether join error: ' + JSON.stringify(err))
  }
  return
}
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