nanogui: Thread: Re: GrArc() function doc update [part trois]

Final word on this Arc thing.

I have found that if the start and end points are described as being within a
distance less than the radius of the arc, it will act funny.

Below I mentioned that changing the value from -25 to -2500 was fine, changing it
to -24 it started to act up.

I am thinking that a patch to the GrArc() code might do a shift left until the
point was described as being beyond the radius of the arc.

I hope this does not cause a problem as most Microwindows apps might not have
screen dimensions approaching a half of the max size of a signed int.

Please correct me if I am mistaken,

-rob

Robert Hartley wrote:

> Changed the value below from -25 to -2500 had no visible change.
>
> So, could someone please correct my understanding if wrong:
>
> Points a & b are used to calculate a vector from the origin of the arc to
> indicate where the arc starts and stops.
>
> Robert Hartley wrote:
>
> >  /* upper left */
> >  GrArc(paintDrawable, gc2,
> >   100, 100,  /* x, y */
> >   25,25,  /* rx, ry */
> >   0, -2500, /* ax, ay */
> >   -25, 0, /* bx, by */
> >   1);   /* type */
> >
> > In the docs, we may want to change it to read "relative to the origin of x,y"
> >
> > What would happen if we were to indicate points [a & b] whose distance from
> > [x,y] did not coincide with the radii [rx, ry], I am not sure, but I have
> > enough now to be able to draw rectangles with rounded corners in NanoX

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