topic Re: Standard Graphics App Text Scrolling in Software Archive

Standard Graphics App Text Scrolling

jajr — Sun, 04 Feb 2001 03:54:22 GMT

I have converted a large legacy application into a QuickWin Standard Graphics Application. The program can produce a large amount of text output, and the problem is that this scrolls very slowly.
Is there any way to speed up this scrolling?

Re: Standard Graphics App Text Scrolling

Steven_L_Intel1 — Mon, 05 Feb 2001 05:44:40 GMT

Only by reducing the window size. A QuickWin window is a bitmap, and if the bitmap is very large (especially if your screen resolution is high), scrolling can be slow.

Steve

Re: Standard Graphics App Text Scrolling

jackosullivan — Wed, 07 Feb 2001 05:49:05 GMT

Steve,
Does your note about Quick Win windows being bit maps (and thus slow) imply that perhaps true PI-generated windows are not? Put another way, will my Fort ran's dynamic graphics work noticeably faster if I convert to Win32 PI rather than keep my graphics in Quick Win?

Re: Standard Graphics App Text Scrolling

jackosullivan — Wed, 07 Feb 2001 05:52:17 GMT

stupid spell-checker! "PI" of course, should be "API", "Quick Win" should be "QuickWin", "bit maps" should be "bitmaps", and "Fort ran" (!) should be Fortran!
sorry about that..
God bless!
Jack

Re: Standard Graphics App Text Scrolling

Steven_L_Intel1 — Wed, 07 Feb 2001 06:55:05 GMT

When you use the Win32 API, you're usually creating bitmaps anyway. The thing about QuickWin is that you get a scrollable window, which is hard to do directly with the Win32 API, and that scrolling the window involves copying portions of a bitmap - memory and processor-intensive.

If you can live without scrolling, you MIGHT get a bit more speed out of direct Win32 calls, but I doubt it's worth the hassle.

Steve

Re: Standard Graphics App Text Scrolling

jackosullivan — Wed, 07 Feb 2001 07:36:12 GMT

exactly what I wanted to hear! too old to learn API graphics!
Thanks, as usual, Steve, for your speedy and expert response.
God bless!
jack