func renderGIF(f *data.Slice, info data.Meta, out io.Writer) { draw.RenderFormat(out, f, *flag_min, *flag_max, *flag_arrows, ".gif", colormap...) }
// synchronous snapshot func snapshot_sync(fname string, output *data.Slice) { f, err := httpfs.Create(fname) util.FatalErr(err) defer f.Close() draw.RenderFormat(f, output, "auto", "auto", arrowSize, path.Ext(fname)) }