Am Mittwoch, den 23.08.2006, 20:31 +0200 schrieb Nicolas:
Could you please explain the syntax to apply the patch? I'm not familiar
> at all with that command...
>
>
Hello Nicolas,
patching is simple, you just feed the patch to stdin of the patch command. The
only complication is the "-p" parameter, which ist
necessary in almost all cases. Its purpose is, that the patch command
can find the target files it has to patch on /your/ system. As a
reference, it usess the paths and filenames provided in the patch file,
but it removes a prefix from each given path before it tries to find
the target file on your system. There are examples in the manpage,
but -- actually in this case, it is simple (I just wrote the explanation
because I never like people doing things "blind" without them knowing
at least a bit of what is happening....)
OK. You have the *.zip file containing the patch.
1. go to the root directory of your cinelerra source tree (i.e. the
directory containing the cinelerra/ guicast/ plugins/ and debian/
dirs)
2. unpack the zip from there:
unzip bezier_patch-1hiv20060818.patch.zip
as a result, it should place the four new png files into the
plugin/suv/data ....etc... dirs
and it should unpack the patch itself in the root of the source tree.
3. apply the patch with
patch -p 0 < bezier_patch-1hiv20060818.patch
he should report just that he is patching some source files, but no
errors and no additional questions. If something fails at this point,
then please mail me again!
4. build and install
You wrote :
> > One final word to the compatibility ...
> ...
> if you afterwards open a session file edited with the patched
> > Cinelerra in a old version of Cinelerra, your control points will
> > again show up in the old (strange) way, but with their horizontal
> > position reset to zero, i.e. they will show up exactly above and below
> > the corresponging automation node.
>
> Does that mean the curves will be transformed into straight lines?
> No, the curvature of the line is retained, only the display of the
control points is messed up slightly. The explanation why this is
the case is given in the manual section you cited: the way it is
implemented in cinelerra, the /horizontal/ position of the control
point is irrelevant, only the vertical position matters.
> BTW, it's written in the official Cinelerra manual :
> ...
> While the input control and the output control can be
> > moved horizontally as well as vertically, the horizontal movement is
> > purely for legibility and isn't used in the curve value.
>
that's fine! I wasn't aware of this section in the manual.
I always draged the keyframes horizontally and expected the curve to
change, as I would expect it from a full-fledged implementation of
bezier curves, and it seemed to change something (actualliy it didn't)
an so I felt betrayed and got angry. This is, why I made this fact
explicit in my patch: there you can only drag the points vertical.
There is another reason why I changed this: if you can drag the
control point horizontally as you like and this has really no
effect (as it is in cinelerra up to now), the so called
"tangent property" of bezier curves is completely messed up.
This tangent property means, that the line from the node to
the control point is at the same time the tangent on the
smooth curve in this node, i.e. the slope of the curve
at this side of the node.
> This my English isn't very good, I miss the point...
> please tell me, if I express myself too complicated.
I'm not a native speaker as well, and (worse) I studied
math some long time ago :-) and thus tend to express myself
overly complicated at times ;-)
Cheers,
Hermann
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