> > On Jun 20, 2007, at 11:55 AM, FLTK is NICE wrote: > > > I am trying to push a lot of chars into Fl_Text_Display via > > Fl_Text_Buffer in a short amount of time. > > If you push individual characters during a callback or whatever, > simply returning (or calling redraw()) should de the job. The screen > should not be redraw more often than 25 times a second, which still > looks real-time, but consumes much less cpu cycles than drawing after > *every* character. Fl::flush(), for example, would redraw much more > often than needed. > > If that doesn't fix the problems, there are a few more tricks in the > box: > > You can figure out how many characters can be received before adding > them to the bufer, so that the flow still looks real tim (for > example, at 19200bps, you would receive 1920 characters per second; > the human eye perceives 25 frames as a continous motions, so 1920/25 > = 76, so you can receive 76 characters in a fast (static) buffer, and > then add them to the FlText_Display all at once, avoiding 75 > rellocation calls. > > If there is no fixed rate, you can set a timer that will copy all > characters received into the Fl_Text_Display every 1/25 seconds, > using fl_add_timeout.
> Also, try Fl_Multiline_Input. It's a much simpler widget that might > reder quicker, but does not show a scroll bar. > > And then you could write you own little widget with a static text > buffer, which sets a "redraw()" every time a character is received, > and then have a custom "draw()" function that is very fast. > > I must thank the people who created FLTK and maintain it. It's by > > far the best gui for cross-OS coding, super slim and right to the > > point. But please let fltk.org get a better forum. > > Thanks > > Matthias > > ---- > http://robowerk.com/ > Thanks Matthias Some great advice You give. I will try the timer trick, and maybe in combo with the Fl_Multiline_Input widget also. tob _______________________________________________ fltk mailing list [email protected] http://lists.easysw.com/mailman/listinfo/fltk
