Re: scrollbar position range

btroyer · ‎03-06-2003

Hi -
I am using XFT (and LOVE IT) with CVF I would like to plot a small portion of a large data set and use a scroll bar. this is working OK till I get into a very large data set 72000 points... then I can' use the mouse to move the scroll box past about half way, but I can if I click in the high end of the scroll window or the up arrow. what are the work arounds??

Thanks
Bill

Jugoslav_Dujic · ‎03-07-2003

Hello Bill,
Support for XFT is on my e-mail address, not on the Forum :-). You can drop me a compilable workspace and I'll take a look. Sounds like a 16-bit limitation somewhere.

Jugoslav

btroyer · ‎03-07-2003

Hi all -

Jugoslav is just amazing!! Sent sample code and with in an hour he had it fixed - and it was a "limitation" (BUG) from CVF in the DFLOGM.F90 code.

Bill

Intel_C_Intel · ‎03-07-2003

Jugoslav,

The WM_HSCROLL, WM_VSCROLL message use only the high-order word of wParam to pass in the scroll position, so the position is limited to 65,535. To get a higher resolution position call GetScrollInfo().

John

Jugoslav_Dujic · ‎03-07-2003

Yeah John, that was it. Btw, I drop an eye on the latest DFLOGM and it looks to me (didn't pass through the debugger) that the limit there will actually be 32768, since INTEGER(2) intermediate variable is used. A fix will be welcome :-).

Jugoslav

Steven_L_Intel1 · ‎03-07-2003

Jugoslav, what are you looking at? I don't see any INTEGER(2) variables being used...

Steve

Jugoslav_Dujic · ‎03-08-2003

...because it isn't INTEGER(2), but an INTEGER*2 ;-)

	! WM_?SCROLL: 
	else if (msg .eq. WM_HSCROLL .or. msg .eq. WM_VSCROLL) then
        !will overflow when hiword(wparam>=32768):
	  int_2 = iand(ishft(wparam,-16), 16#ffff)
	  call DlgWmScroll( dlg, lparam, iand(wparam, 16#ffff), int(int_2) )

Jugoslav

Jugoslav_Dujic · ‎03-08-2003

...and if someone's at it, here's another bug in DFLOGM.f90 (it would be exposed in exotic situations, but...):

  subroutine DlgSetTitle( dlg, title )
!DEC$ ATTRIBUTES DEFAULT :: DlgSetChar

Jugoslav

Steven_L_Intel1 · ‎03-08-2003

I see I was looking in the wrong routine. That does look a bit suspicious - probably should be ZEXT rather than INT. Thanks.

Steve