text: __all__ = ["AboutPanel"]
  
  import os
  
  from PySide2.QtCore import Qt
  from PySide2.QtWidgets import QGridLayout, QDialog, QTextBrowser
  
  about_md = """
  
  # QGrain
  
  QGrain aims to provide an easy-to-use and comprehensive analysis platform for grain-size distributions. QGrain has implemented many functions, however, there still are many useful tools that have not been contained. Hence, we published QGrain as an open-source project, and welcome other researchers to contribute their ideas and codes. Codes are available at this GitHub [repository](https://github.com/yuriok/QGrain/). More information and tutorials are available at the [offical website](https://qgrain.net/).
  
  Please cite:
  
  * Liu, Y., Liu, X., Sun, Y., 2021. QGrain: An open-source and easy-to-use software for the comprehensive analysis of grain size distributions. Sedimentary Geology 423, 105980. https://doi.org/10.1016/j.sedgeo.2021.105980
  
  Feel free to contact the author below.
  
  * Yuming Liu, a PhD student of IEECAS, [liuyuming@ieecas.cn](mailto:liuyuming@ieecas.cn)
  
  """
  
  class AboutPanel(QDialog):
      def __init__(self, parent=None):
          super().__init__(parent=parent, f=Qt.Window)
          self.init_ui()
  
      def init_ui(self):
          self.layout = QGridLayout(self)
          self.setWindowTitle(self.tr("About"))
          self.setMinimumSize(400, 400)
          self.text = QTextBrowser()
          self.layout.addWidget(self.text, 0, 0)
          self.text.setMarkdown(about_md)
          self.text.setOpenExternalLinks(True)
  
  
  if __name__ == "__main__":
      import sys
  
      from QGrain.entry import setup_app
      app, splash = setup_app()
      main = AboutPanel()
      main.show()
      splash.finish(main)
      sys.exit(app.exec_())
  