fxruby users - Jul 2008 - Drawing a rotated ellipse

Hi - 

I''m trying to draw an ellipse using a device context on an FXCanvas.  I
need
to be able to rotate the ellipse however (i.e. rotate the ellipse by 45
degrees) and haven''t found any rotation settings for the device context
drawing objects.  Is there a way to do this?  If so, how would I accomplish
that?  If not, are there any other ways to accomplish this besides using a
device context?

Thanks!
Jonathan
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On Mon, Jul 14, 2008 at 4:43 PM, RkyMtnEng <jhadders at ball.com> wrote:
> I''m trying to draw an ellipse using a device context on an
FXCanvas.  I need
> to be able to rotate the ellipse however (i.e. rotate the ellipse by 45
> degrees) and haven''t found any rotation settings for the device
context
> drawing objects.  Is there a way to do this?  If so, how would I accomplish
> that?  If not, are there any other ways to accomplish this besides using a
> device context?
There''s nothing built in to FXCanvas (or the FXDC class) to
arbitrarily rotate objects like ellipses; you''d need to write your own
ellipse-drawing routine that''s able to do those transformations.

You might be able to do this more easily with FXGLCanvas (i.e. using
the GLCanvas as a 2D canvas and ignoring the third dimension). You''d
still need to come up with ellipse-drawing code, but you should be
able to take advantage of OpenGL''s support for transformation
matrices. (Of course that''s not of much help if you don''t know
OpenGL...)