> paul wrote:
> > hi can anyone suggest a way to output fast changing data, float percentages,
> > counter integers etc? do i have to use an output box and mess with string
> > conversion and clearing box all time or is there a native printf style
> > formatted call?
>
> Just about anything should work including just changing the label of a
> box.
>
> String conversion is unavoidable, as somewhere along the line the value
> has to be converted to a string to be printed. Regardless, the speed of
> this will be faster than your eye can perceive, and likely faster than
> the graphics adapter can display the font.
>
> I'd suggest using sprintf() to a string, and display the string.
> Use an Fl_Box if you want the data to appear on a background, eg:
>
> // Init
> box = new Fl_Box(...);
> box->box(FL_FLAT_BOX);
> box->align(FL_ALIGN_INSIDE|FL_ALIGN_LEFT);
>
> ..then whenever you want to update the data to the screen:
>
> // Your data update callback
> void UpdateCallback() {
> static char s[200];
> sprintf(s, "VAL=%d FVAL=%f YVAL=%ld ..", ...);
> box->label(s);
> box->redraw();
> }
>
> You won't have to do the clear, as the label will redraw itself
> correctly, since the box is an FL_FLAT_BOX and the text is drawn
> inside the box.
>
> Or, as Albrecht described, use Fl_Output and friends, which essentially
> does some of the above for you. But if the string of values you're
> printing is a complex long printf() style statement, the above is a good
> way to go with sprintf()/snprintf()/etc.
Yes thanks for the reply, i spotted the sprintf() option while going through
some of the test folder sample code, it seems to do the trick nicely.
It is early days for me and i need to see how to properly embed my code in an
event loop, because i asked a for loop to output a count using the method we
have discussed, the thing is if i put a high count in the window hangs and does
not display until the count is complete, even though the show() function was
already called in the constructor,
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