Re: File dialog in wxt does not work

[Philipp K. J. <ja...@ie...>]

On Sun, 21 Sep 2014 10:39:55 -0700
sfeam <sf...@us...> wrote:

Thanks for the explanation!


> On Sunday, 21 September 2014 09:31:52 AM Philipp K. Janert wrote:
> > 
> > [snip]
> > 
> > > 
> > > > When using the "classic" method (set t ..., set o,
> > > > replot, etc), it's very specific regarding the size
> > > > and resolution of the bitmap or vector image that
> > > > is being saved. Is there any control over these
> > > > qualities when copying to clipboard?
> > > 
> > > In theory , set term wxt size 800,300  determines the terminal
> > > window size, hence what is copied, by any technique, from the
> > > screen output. Also FVWM can display the window size during drag
> > > to get an exact desired window size.
> > > 
> > 
> > Since this whole functionality is new to me, I am trying
> > to make sure I am really getting it. I it possible to 
> > generate genuine vector graphics this way (that is, going 
> > through the clipboard)?
> 
> It is technically possible.  For instance on Windows the clipboard
> holds blocks of WMF or EMF (or at least it used to, I have not used
> Windows for many years).  In principle an application can stuff
> arbitrary data into a clipboard, but in practice it's usually 
> either pure text or a bitmap image.  Current the wxt terminal
> stuffs a bitmap image to the clipboard.  Here is the code:
> 
>         wxTheClipboard->UsePrimarySelection(false);
>         /* SetData clears the clipboard */
>         if ( wxTheClipboard->Open() ) {
>                 wxTheClipboard->SetData(new
> wxBitmapDataObject(cp_bitmap)); wxTheClipboard->Close();
>         }
>         wxTheClipboard->Flush();
> 
> I think it would be straightforward to have the wxt terminal offer
> the same output widget options as the qt terminal:  png/pdf/svg output
> of the current plot contents triggered from the GUI.   There is a nice
> comparison of how to generate the various output modes here:
> 
> 		http://zetcode.com/gfx/cairo/cairobackends/
> 
> In this case you probably would want to export to a file rather than 
> to the clipboard, just because most applications on the receiving end
> probably won't know what to do with a block of svg (for instance) 
> pulled from the clipboard.  But Inkscape might. 
> 
> > I just tried to export a graph to PDF, by copying to 
> > clipboard and then pasting into inkscape - when blown
> > up, the results are definitely pixelated (which they
> > would not be with "genuine" PDF).
> 
> Inkscape is an SVG tool.  It can import bitmap images,
> but I don't think it knows how to convert PDF to SVG.
> In fact I don't know of any tool that does this.
>  
> > So, is it fair to say that the copy-to-clipboard tactic
> > gets me exactly the graph I see - as a pixmap -, but that
> > if I want vector graphics, the classic set t pdfcairo, etc
> > strategy is the way to go?
> 
> That's what I do in practice.  I find that the pdfcairo output
> is nearly identical to the wxt screen display content if you
> specify an appropriate size for the pdf canvas.  But as noted
> above this could probably be automated via a GUI widget.
> Patches welcome.
> 
> 	Ethan
> 
> 
> 
> 
>