You can try using pycairo to generate PS/PDF/PNG in the background. http://cairographics.org/pycairo/ http://www.tortall.net/mu/wiki/CairoTutorial
I think this will be better way than widget tricks. -- Regards, Igor Novikov sK1 Project http://sk1project.org On Tue, Mar 1, 2011 at 6:05 PM, Matt Keenan <matt.kee...@oracle.com> wrote: > Hi, > > Looking for the best means of generating postscript from a canvas widget > but having the canvas widget in the background, and not visible to the user. > > I have an application that I'd like to batch generate a web site from, > including a set of graphs. > > the graphs are plotted on a canvas widget with a convenience function and > then postscript is generated using the canvas.postscript() method. > > The only means I can see of generating valid postscript is when the canvas > widget and root are displayed to the user. I'd prefer if this could be > hidden. > > Following code is a rough example of what happens when the user clicks the > generate button > > def generate_webpage(self, emplist): > myroot = Tk() > mycanvas = Canvas(myroot, width=700, height=400) > mycanvas.pack() > mycanvas.root = myroot > > for i in range(0, len(emplist)): > # PostScript file name > psname = "graph%s.ps" % (i) > > # Clear canvas down > canvas.delete(ALL) > > # Plot graph on canvas > PlotLineGraph(mycanvas, emplist[i]) > > # Update tasks and canvas > self.update_idletasks() > mycanvas.update() > mycanvas.update_idletasks() > > # Generate postscript > mycanvas.postscript(file=psname, pagewidth=675, > pageheight=400) > > myroot.destroy() > > > As can be seen, when generate_webpage is clicked, a new popup window is > shown and each graph as generated is shown within the window as it's done. > > If I add myroot.withdraw() to above method, just after packing mycanvas, > then no popup appears but all the postsript files are blank > nothing is actually plotted on the canvas !! > > Does anyone know of a way to get around this ? > > cheers > > Matt > > > _______________________________________________ > Tkinter-discuss mailing list > Tkinter-discuss@python.org > http://mail.python.org/mailman/listinfo/tkinter-discuss >
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