On Apr 14, 8:29 pm, Bob Crawford <Snowma...@[EMAIL PROTECTED]
> wrote:
> On Apr 11, 10:38 am, Spon <christoph.b...@[EMAIL PROTECTED]
> wrote:
>
>
>
> > On Apr 11, 3:26 pm, Spon <christoph.b...@[EMAIL PROTECTED]
> wrote:
>
> > > On Apr 11, 12:56 pm, rhyme2ri2 <rhyme2...@[EMAIL PROTECTED]
> wrote:
>
> > > > Hello all,
>
> > > > A very simple thing i'm trying to do but somehow i'm stuck with
it....
> > > > I want a bitmapped button. For this i'm using following :
>
> > > > cmddownloadall = Widget_Button(pradar, UNAME='cmddownloadall' $
> > > > ,XOFFSET=800 ,YOFFSET=100 ,SCR_XSIZE=30 ,SCR_YSIZE=24 $
> > > > ,/ALIGN_CENTER,TOOLTIP='Download All files' $
> > > > ,VALUE='downloadall.bmp' ,sensitive=0,frame=1,/BITMAP)
>
> > > > Well this is it and i'm not able to get the image button. Issues
like
> > > > checking the availability of file or trying to provide the full
path
> > > > name of image file are already addressed by me :)
> > > > Image is a 24-bit bitmap.
>
> > > > What it shows is just a blank button with the frame or sometimes
just
> > > > the text written in value..(strange but true)
>
> > > > Can any one point out where m i wrong??
>
> > > > Thanks & Regards
> > > > -Ritu
>
> > > Using IDL v6.4 on Windows XP Pro, I can duplicate your problem. It
> > > goes away when I set sensitivity = 1
> > > I guess it might be a bug.
> > > Can anyone else verify this?
>
> > > Regards,
> > > Chris
>
> > Looking at it again, it may even be a Feature. I can merrily show and
> > hide the bitmap at will if I stick in a second button that switches
> > the sensitivity of the bitmap button on and off.- Hide quoted text -
>
> > - Show quoted text -
>
> On my system at least 'c:\windows\coffee bean.bmp' is an 8-bit
> bitmap.
>
> Using a 24-bit version has a slightly different effect, rather than
> hiding the whole image the color appears to be turned on/off.
Hi Bob,
Yes, I should've picked a 24-bit file, I guess.
I've tried that now, and yes, with a 24-bit file you can always tell
the bitmaps's there even when the button isn't active. It may be grey,
but it's not invisible, like with 8-bit ones.
According to the helpfile, the bottom left hand pixel's value gets
designated the 'background' value in 24-bit pixels, and becomes see-
through. I'm not sure how this affects how it's displayed in its
'greyed-out' state, maybe it just averages across the r,g,b colour
values for every point or something.
>
> BTW Using your example code the image is visible when the button is
> labelled "On". Isn't that sensitivity = 1?
Yes. The whole point of my example code was to show that I can toggle
bitmap visibility by toggling button sensitivity. :-)
It's what convinced me that the effect was a feature, not a bug.
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