Freezing the zoom and pan

[David]

Hi,

How do you set up a board so that zooming and panning are disabled? So that you have a fixed static image?

Is there a simple parameter one can add to the board initialization for this purpose?

Thanks.

David Arnold
College of the Redwoods
Eureka, CA 95501
http://msemac.redwoods.edu/~darnold/index.php

[michael]

Hi David,

atm only the navigation bar can be disabled via

shownavigation: false

when initializing the board, e.g.:

JXG.JSXGraph.initBoard('jxgbox', {boundingbox: [-9, 8, 9, -10],shownavigation: false});

But disabling the zoom via mouse wheel or panning via shift+drag is not possible, yet. But it sounds useful, i'll note it in our tracker.

michael

[evertv...@gmail.com]

You can remove the event mouseheel and mousscroll as followed:

JXG.removeEvent(board.containerObj, 'mousewheel', board.mouseWheelListener, board);

JXG.removeEvent(board.containerObj, 'DOMMouseScroll', board.mouseWheelListener, board);

but i still don't know how to remove the panning event.

[michael]

It will be possible with the next release which we are preparing right now. The options to pass in initBoard are {zoom: false, pan: false}.

This will disable all zooming/panning with gestures and keyboard shortcuts.

michael

[PierreG]

Hi,
Yes, I also look forward for the version with the possibility of
freeze panning (triggered by scrolling in the board) and zooming.
Loving jsxgraph otherwise.
P

[michael]

This is possible in version 0.93:

http://jsxgraph.uni-bayreuth.de/wp/2012/01/26/release-of-version-0-93/

[PierreG]

Great, thanks!

[Murray]

Hi

This documentation http://jsxgraph.uni-bayreuth.de/wiki/index.php/Options suggests "pan:false" as the way of turning off pan ability, but it doesn't work.

Cleonis' fiddle at http://jsfiddle.net/Cleonis/LUnVA/ has

pan: {enabled: false}

And this works!

Perhaps the documentation should be updated? Or it seems to me that "pan:false" is more consistent syntax and should be the accepted method.

Thanks and regards

Murray

[Cleonis]

I notice that the current version of options.js
https://github.com/jsxgraph/jsxgraph/blob/master/src/options.js

Specifies 'pan' as follows:

pan: {

                needShift: true,

                needTwoFingers: true,

                enabled: true

            }


Presumably in an earlier state 'pan' was like, say, the option 'showNavigation', hence the syntax 'pan:false' in an example in the wiki.
http://jsxgraph.uni-bayreuth.de/wiki/index.php/Parallel_projection_of_a_sphere


But at a later stage an additional level was added. The property 'needTwoFingers' is obviously touch-interface related; 'needShift' is presumably keyboard-related.

I guess the alternative would have been to create an option 'panInterface', with the following properties:

panInterface: {

                needShift: true,

                needTwoFingers: true,

            }

Then the syntax 'pan:true','pan:false' would have remained.

In this case we see a decision was made to change the syntax.

[Alfred Wassermann]

Yes, exactly. Sorry for the inconvenience.
The documentation at http://jsxgraph.uni-bayreuth.de/wiki/index.php/Options is now updated and points directly to the github page.
Best wishes,
Alfred