util.py 文件源码

def print_to_file(self, filename=None):
        """
        Print the contents of this ``CanvasFrame`` to a postscript
        file.  If no filename is given, then prompt the user for one.

        :param filename: The name of the file to print the tree to.
        :type filename: str
        :rtype: None
        """
        if filename is None:
            from tkinter.filedialog import asksaveasfilename
            ftypes = [('Postscript files', '.ps'),
                      ('All files', '*')]
            filename = asksaveasfilename(filetypes=ftypes,
                                         defaultextension='.ps')
            if not filename: return
        (x0, y0, w, h) = self.scrollregion()
        self._canvas.postscript(file=filename, x=x0, y=y0,
                                width=w+2, height=h+2,
                                pagewidth=w+2, # points = 1/72 inch
                                pageheight=h+2, # points = 1/72 inch
                                pagex=0, pagey=0)