nanogui: Thread: Re: GrArc() function doc update

Hi,

Thank you very much!

It seems the operative word was "relative"

I misread the doc snippet you sent, thinking that you had said it was
relative to the origin and the following code worked properly.

 /* lower right */
 GrArc(paintDrawable, gc2,
  100, 100,  /* x, y */
  25,25,  /* rx, ry */
  0, 25, /* ax, ay */
  25, 0, /* bx, by */
  1);   /* type */

 /* upper left */
 GrArc(paintDrawable, gc2,
  100, 100,  /* x, y */
  25,25,  /* rx, ry */
  0, -25, /* 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

Thanks!

Robert


Alex Holden wrote:

> On Wed, 29 Nov 2000, Robert Hartley wrote:
> > I am doing my best to annoy myself figuting out how the GrArc() function
> > is supposed to be used.
>
> Ah, it appears that Greg never included the API documentation I wrote
> several months ago... You can find a copy at:
> ftp://ftp.linuxhacker.org/pub/nanogui/nano-X-API.tar.gz
>
> Should I send you the patch again, Greg?
>
> Not sure how much it'll help, but this is the GrArc() entry:
>
> GrArc ()
>
> void        GrArc                           (GR_DRAW_ID id,
>                                              GR_GC_ID gc,
>                                              GR_COORD x,
>                                              GR_COORD y,
>                                              GR_SIZE rx,
>                                              GR_SIZE ry,
>                                              GR_COORD ax,
>                                              GR_COORD ay,
>                                              GR_COORD bx,
>                                              GR_COORD by,
>                                              int type);
>
> Draws an arc with the specified dimensions at the specified position on
> the specified drawable using the specified graphics context. The type
> specifies the fill type. Possible values include GR_ARC and GR_PIE.
>
>           id :  the ID of the drawable to draw the arc on
>           gc :  the graphics context to use when drawing the arc
>            x :  the X coordinate to draw the arc at relative to the
> drawable
>            y :  the Y coordinate to draw the arc at relative to the
> drawable
>           rx :  the radius of the arc on the X axis
>           ry :  the radius of the arc on the Y axis
>           ax :  the X coordinate of the start of the arc relative to the
> drawable
>           ay :  the Y coordinate of the start of the arc relative to the
> drawable
>           bx :  the X coordinate of the end of the arc relative to the
> drawable
>           by :  the Y coordinate of the end of the arc relative to the
> drawable
>           type :  the fill style to use when drawing the arc
> ------- Alex Holden -------

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