> can anyone tell me how to run Xlib functions like XDrawPoints..etc on a
> Xforms window. I tried to use freeobjects and then later canvas but have
> problems passing the correct arguments to them. Please can somebody help
> using simple words! ...
The simplest advice I can give you is to get a copy of the O'Reilly
and Associates _Xlib Programming Manual_. It will tell you how to use
almost all the raw Xlib functions.
If you are using a Free object, I suggest you use the XForms drawing
function rather than raw Xlib.
To draw to a Canvas object, all you need to do is get the Canvas's
window ID, create an appropriate GC (Graphics Context), and use the
functions as normal.
For example:
Window canvas_window = FL_ObjWin( canvas );
GC my_gc;
XPoints *your_point_array = created_however_you_wish();
[...]
/* Create a default GC */
my_gc = XCreateGC( fl_get_display(), canvas_window, 0, NULL );
[... set up the GC to your liking ...]
XDrawPoints( fl_get_display(), canvas_window, gc,
your_point_array, n_points, CoordModeOrigin );
[...]
Setting the color of the points is done by manipulating the GC in the
standard manner.
> ... and does anyone know how to use a 'scrolled
> canvas'.
That's easy. According to the manual, it is not implemented yet. :-(
spl
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