Help in saving screenshot

Biplab Dhakal

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Jun 30, 2021, 3:16:50 PM6/30/21

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Hello all,

I am making an Oscilloscope app and now i am trying to save the graphs. I read some of post and articles but could get all of it. I tried using fl_offscreen and stuffs but i couldn't do it. Does have any idea on this?

It looks like this, I have to save screenshot of black box with signals.

Hope you can help me out.

Thanks

Screenshot_20210630-192941_Write on PDF.jpg

Greg Ercolano

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Jun 30, 2021, 3:36:13 PM6/30/21

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    Have you looked at the test/device.cxx program?

    It shows how to screen capture in various ways, including for printer output
    as well as .svg, .eps, and in raw data suitable for display with Fl_Image_Surface..

Ian MacArthur

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Jun 30, 2021, 5:34:42 PM6/30/21

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In addition, beyond what Greg suggests, there have over the years been several examples posted here of capturing window or offscreen surfaces to PNG files, so if you have a search though the archives you may well find what you need.

(Assuming that capturing your window to a PNG would be what you need!)

That said, I had a very cursory look just now and didn’t see anything, though I know there are some... indeed I'm pretty sure I have posted such examples in the past myself!

Biplab Dhakal

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Jun 30, 2021, 5:34:59 PM6/30/21

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Where is it ? couldn't find exactly

Ian MacArthur

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Jun 30, 2021, 5:36:30 PM6/30/21

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On 30 Jun 2021, at 21:44, Biplab Dhakal wrote:
>
>
> Where is it ? couldn't find exactly

In the “test” folder of the fltk tree...

PS: please don't top-post here and trim the citations as appropriate. Thanks.
https://en.wikipedia.org/wiki/Posting_style#Top-posting

Biplab Dhakal

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Jun 30, 2021, 6:08:43 PM6/30/21

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Sorry i am new in fltk. I don't many thinks. I tired programming um fltk now watching tutorials and other programming ideas.

Can u explain further? Or provide specific link were can find it

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Greg Ercolano

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Jun 30, 2021, 6:14:27 PM6/30/21

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On Wednesday, June 30, 2021 at 9:36:13 PM UTC+2 er...@seriss.com wrote:

Have you looked at the test/device.cxx program?

It shows how to screen capture in various ways, [..]

as well as .svg, .eps, and in raw data suitable for display with Fl_Image_Surface..

Where is it ? couldn't find exactly

    It's part of the source code distribution of FLTK.
    On the main fltk.org page click "Download" and try the current fltk release (fltk 1.3.6)
    or if you prefer using git, you can clone the fltk repository using:

	git clone https://github.com/fltk/fltk.git

Either way, once you extract the code, look in the ./test subdirectory for 'device.cxx'.
There are also example programs in the ./examples subdirectory.

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