单元格实现绘制图标

var img = undefined;
function ImageCellType() {}
ImageCellType.prototype = new GC.Spread.Sheets.CellTypes.Text();
ImageCellType.prototype.paint = function (
  ctx,
  value,
  x,
  y,
  width,
  height,
  style,
  context
) {
  spreadNS.CellTypes.RowHeader.prototype.paint.apply(this, arguments);
  if (img) {
    ctx.save();
    ctx.beginPath();
    ctx.moveTo(x, y);
    ctx.drawImage(img, x + 90, y, 20, 20);
    ctx.restore();
    return;
  } //创建新的图片对象
  img = new Image(); //指定图片的URL
  img.src = "2.png"; //浏览器加载图片完毕后再绘制图片
  img.onload = function () {
    context.sheet.repaint();
  };
};