private void ExportWholeImage(EditorCanvas canvas)
{
var pngFilename = "note.png";
var pngFilepath = Path.Combine(_outputDir.FullName, pngFilename);
canvas.SaveAsPng(pngFilepath);
//var emfFilename = "note.emf";
//var emfFilepath = Path.Combine(_outputDir.FullName, emfFilename);
//canvas.SaveAsEmf(emfFilepath);
_html.AppendLine("<h3>全体イメージ</h3>");
_html.AppendLine("<p>");
_html.AppendLine(string.Format("<img class=\"border\" src=\"{0}\" />", pngFilename));
_html.AppendLine("</p>");
}