Implementing direct mouse dragging
Sebastian Paul
I am searching for a solution that allows dragging/moving/translate
objects *directly* with the mouse. Direct means, the objects moves
exactly with the cursor.
sun.j3d.utils.behaviors.mouse.MouseTranslate implements such a
behavior, but the object is just translated into the direction of the
mouse movement, with a constant factor. The higher the factor, the
higher the translation.
I could somehow calculate the factor so that the translation
synchronizes with the mouse cursor. I think this may only work with
parallel projection, but that would be fine for me. But I have no idea
how to determine the correct factor.
Another way would be an own implementation, but that goes a little far
beyond my knowledge.
I had to create a ray from the mouse cursor on the projection plane,
and calculate a transform so that the picked point of the current node
lies on that ray.
Sounds complicated for me... Can anyone give some hints?
Kind regards, Sebastian
Alexander Gran
> Sounds complicated for me... Can anyone give some hints?
To me too. But I'm searching for the very same thing. So if you've found
something, let us know.
regards
Alex
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Miss Elaine Eos
<7bc88e7f-fc92-4218...@18g2000hsf.googlegroups.com>,
Sebastian Paul <sebpaul...@googlemail.com> wrote:
> I could somehow calculate the factor so that the translation
> synchronizes with the mouse cursor.
This is the "correct" solution, and the whole reason the factor exists.
Obviously, if you scale the image or change view parameters, you need a
different factor.
Btw, you can calculate the factor for orthographic projection, but you'd
need to do some trig -- it's similar to when the view params change or
the image scales, but you have to update it "live."
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