> > > The curve is keeping going, from left to right. When reach=20 > > the right border, > > it will loopback to the left border, and do this again and again. > >=20 > > But, when the curve loopback to the left border, the existent=20 > > drawing will not > > be erased immediately. Instead, the older drawing will be=20 > > erased step by step, > > where the new curve is drawing. > >=20 > > Considering the efficiency. In this case, which widget should=20 > > I draw on? > > Fl_Box, Fl_Window or others? How can I erase the image step by step, > > not erase all of it? Which function should I use? > > How many sample points in your line? > > When I did this, I just used an Fl_Box, and redrew the entire curve > every time (partial updates were too much effort and hard to do.) > > So I simply kept the last 512 or so points in a circular buffer, and > redraw the entire list on every redraw. Then it was simply a matter of > putting the new samples into the list in the right place and it Just > Worked. > > Have you looked in the links bazaar for oscilloscope widgets contributed > by other users? I think there used to be some, and they would most > likely do just exactly what you want... > > > > > SELEX Sensors and Airborne Systems Limited > Registered Office: Sigma House, Christopher Martin Road, Basildon, Essex= > SS14 3EL > A company registered in England & Wales. Company no. 02426132 > ******************************************************************** > This email and any attachments are confidential to the intended > recipient and may also be privileged. If you are not the intended > recipient please delete it from your system and notify the sender. > You should not copy it or use it for any purpose nor disclose or > distribute its contents to any other person. > ******************************************************************** >
Thanks for your suggestion. I found "Fl_Scope" in the links bazaar. That is exactly what I want! Another question, what's the "You have 3 moderation points available" mean? _______________________________________________ fltk mailing list [email protected] http://lists.easysw.com/mailman/listinfo/fltk
