Re: [Matplotlib-users] clipboard copy

[Todd M. <jm...@st...>]

On Mon, 2004-09-13 at 12:08, John Hunter wrote:
> >>>>> "Matt" == Matt Newville <new...@ca...> writes:
> 
>     Matt> I agree that it would not be that easy with TkAgg. I think
>     Matt> you have to use Tkinter.Canvas.postscript() to get a
>     Matt> representation of the whole canvas.  Then you'd have to
>     Matt> convert postscript to a bitmap that can be copied to the
>     Matt> clipboard (using clipboard_copy() / clipboard_append()).  I
>     Matt> think that's not very easy, as PIL is not that good with
>     Matt> postscript.
> 
>     Matt> It might be easier to switch to the Agg backend and create a
>     Matt> bitmap that can then be copied to the clipboard.  This looks
>     Matt> possible, and might make a more uniform way to copy to
>     Matt> clipboard.
> 
>     Matt> By the way, for the WXAgg backend, copy to the clipboard is
>     Matt> fairly simple, as it already provides the bitmap: For a
>     Matt> canvas = FigureCanvasWxAgg(...)
> 
>     Matt> This works: bmp = wx.BitmapDataObject()
>     Matt> bmp.SetBitmap(canvas.bitmap) wx.TheClipboard.Open()
>     Matt> wx.TheClipboard.SetData(bmp) wx.TheClipboard.Close()
> 
> I don't know about how one accesses the operating system clipboard in
> tk or the other GUI toolkits (I assume this is platform dependent),
> but it is easy to get the bitmap from tkagg.  FigureCanvasTkAgg
> derives from FigureCanvasAgg, which provides a method tostring_rgb.
> You should be able to use this to create a bitmap for copying to the
> clipboard.

That sounds pretty easy.  I have two questions:

1. What is meant by "bitmap"?  How standard is the format?

2. Is a "bitmap" the right format?  What about EPS?  

I guess that was 4.

Cheers,
Todd

> 
> This is how wxagg's FigureCanvasWxAgg gets the bitmap in the first
> place
> 
>     def draw(self):
>         """
>         Render the figure using agg
>         """
>         DEBUG_MSG("draw()", 1, self)
> 
>         FigureCanvasAgg.draw(self)
>         s = self.tostring_rgb()  
>         w = int(self.renderer.width)
>         h = int(self.renderer.height)
>         image = wxEmptyImage(w,h)
>         image.SetData(s)
>         self.bitmap = image.ConvertToBitmap()
> 
> Hope this helps...
> 
> Thanks for the wx example.
> 
> JDH
> 
> 
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