[Paraview] Zooming through the ParaViewWeb API

Mon Jul 6 18:42:12 EDT 2015

I figured out my problem. Basically, the API has an expected chain of 
mouse interaction requests:

When zooming:
1 - (fired when ctrl+right-mouse is pressed)
/action/: down
/states/: buttonRight and ctrlKey should be true
/y/: should be the current, normalized zoom (something between 0 and 1)
2 - (fired when mouse moves along y-axis)
/action/: move
/states/: buttonRight and ctrlKey should be true
/y/: should be the current, normalized zoom based on the change in y
3 - (fired when scrolling stops)
/action/: up
/states/: buttonRight and ctrlKey should be false this time
/y/: should be the current, normalized zoom

When rotating:
1 - (fired when left-mouse is pressed)
/action/: down
/states/: buttonLeft is true
/x,y/: should be the current cursor location, normalized
2 - (fired when mouse moves)
/action/: move
/states/: buttonLeft is true
/x,y/: should be the current cursor location, normalized
3 - (fired when left-mouse is released)
/action/: up
/states/: buttonLeft should be false this time
/x,y/: should be the current cursor location, normalized

As long as those requests take place in the right order, everything 
works as expected. Thanks for the clues, guys.

Jordan

Jordan Deyton
Oak Ridge National Laboratory
Telephone: (865) 574-1091
Email: deytonjh at ornl.gov

On 7/2/2015 1:03 PM, Deyton, Jordan H. wrote:
>
> I wasn't really sure what to use for the action.
>
>
> (I will double check that I'm sending the full request with all 
> parameters.) I'll try using "move" instead of "none". I'll also try 
> programmatically sending a very small mouse movement with the left 
> click, and report back if I can find anything out.
>
>
> Thanks!
>
> Jordan
>
>
> ------------------------------------------------------------------------
> *From:* Sebastien Jourdain <sebastien.jourdain at kitware.com>
> *Sent:* Wednesday, July 01, 2015 7:09 PM
> *To:* Scott Wittenburg
> *Cc:* Deyton, Jordan H.; paraview at paraview.org
> *Subject:* Re: [Paraview] Zooming through the ParaViewWeb API
> Scott is right, the x,y values are normalized, so depending on your 
> screen size if your image is 1000 pixel wide and you want to reflect a 
> move of 10 pixel, you should send a x of 10/1000=0.01.
>
> On Wed, Jul 1, 2015 at 4:28 PM, Scott Wittenburg 
> <scott.wittenburg at kitware.com <mailto:scott.wittenburg at kitware.com>> 
> wrote:
>
>     Here is a sample from my websocket frames just now:
>
>     [48,4996973606207488,{},"viewport.mouse.interaction",[{"view":353,"action":"move","altKey":false,"ctrlKey":false,"shiftKey":false,"metaKey":false,"buttonLeft":false,"buttonMiddle":false,"buttonRight":true,"x":0.7654596100278551,"y":0.38173817381738173}]]
>
>
>     It seems the "action" should be set to "move" rather than "none",
>     as in the documentation you linked, "none" does not seem to be an
>     option.  Also, as that documentation states, x and y should be
>     normalized to [0, 1], as you correctly guessed.  And finally, you
>     may need to provide all the parameters with values like I show
>     above, not just the ones you are interested in.
>
>     But at any rate, this should not then affect the center of
>     rotation, but it sounds like in your case maybe it is?  Can you
>     see if moving just a *tiny* bit keeps at least some of the object
>     in view?
>
>     Cheers,
>     Scott
>
>
>     On Wed, Jul 1, 2015 at 4:12 PM, Jordan Deyton <deytonjh at ornl.gov
>     <mailto:deytonjh at ornl.gov>> wrote:
>
>         ParaViewWeb gurus,
>
>         Is there a correct way to send a zoom request through the
>         ParaViewWeb API?
>
>         I'm especially looking at the PVW MouseHandler (documentation
>         here --
>         http://www.paraview.org/ParaView3/Doc/Nightly/www/js-doc/index.html#!/api/protocols.ParaViewWebMouseHandler
>         <http://www.paraview.org/ParaView3/Doc/Nightly/www/js-doc/index.html#%21/api/protocols.ParaViewWebMouseHandler>)
>
>         I have had some success by sending a right-click with a small
>         y value (looks like it needs to be between 0 and 1), the
>         action set to "none", and buttonRight set to "true". However,
>         when I afterward rotate the view (using the same RPC call with
>         different methods), the rendered object just vanishes,
>         although the axes and legend are still there.
>
>         Jordan
>
>         -- 
>         Jordan Deyton
>         Oak Ridge National Laboratory
>         Telephone: (865) 574-1091 <tel:%28865%29%20574-1091>
>         Email: deytonjh at ornl.gov <mailto:deytonjh at ornl.gov>
>
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