Geogebra Bug?

[William Haynes]

I"ve run into a strange bug that's affecting a question that worked last summer.

A minimum example is shown here: https://numbas.mathcentre.ac.uk/question/183702/test-geogebra-truss/

When you click on the members of the truss diagram shown in the variable list, the image toggles the way I want it to.

But if you run the question and click on the diagram shown in the statement it doesn't work the same way.  There, clicking on some of the members does nothing, while clicking on other members toggles a different member.

Any ideas what's happening and how to fix?

The original question is:  https://numbas.mathcentre.ac.uk/question/183702/test-geogebra-truss/

[William Haynes]

It looks like the (x, y) coordinates being passed to applet are from the top-left corner of the window, rather than from the top-left of the applet.  This causes a member to the right and down from the point I click to get the hit.

Also, I noticed that if I set the text size in the display options to less than one, the space allocated for the geogebra applet is reduced, causing a horizontal scroll bar to appear.

[Christian Lawson-Perfect]

I have a feeling this is a bug in GeoGebra. 

Numbas is now rendered inside a custom HTML component, which has its own shadow DOM. GeoGebra might not be distinguishing between the parent document's coordinate system and the shadow DOM's. I'll investigate and see if I can reproduce this outside Numbas.

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[William Haynes]

>> I have a feeling this is a bug in GeoGebra. 

Yes, I think you are right.  

Clicks on points, lines, polygons etc all work correctly, but my objects are using a geogebra onClick script.    For those, geogebra thinks that a click at (x,y) is actually happening at (x+a, y+b), so triggers the wrong object's script.

Will

[Christian Lawson-Perfect]

I spent quite a while yesterday trying to reproduce this outside Numbas, and couldn't even get a GeoGebra applet to display properly inside a custom HTML element. It seems it really doesn't like being in a shadow DOM!

Unfortunately, it looks like GeoGebra has stopped offering any support other than suggesting you post on the /r/geogebra subreddit. I don't user reddit, so I can't file a bug report. I think we're stuck.

To view this discussion, visit https://groups.google.com/d/msgid/numbas-users/92e22265-b1c2-437a-bf78-1e871454f9a3n%40googlegroups.com.

[William Haynes]

Christian,

Yesterday I found this page https://www.geogebra.org/m/pfmrng8g#material/hkcnkhvc, which says

If you're sure and know exactly how to reproduce the bug, please contact us via sup...@geogebra.org and let us know the following information:

• detailed step-by-step description how we can reproduce the bug
• screenshots
• app name
• version number

I have a reddit account if you would like me to post something there, too.

Thanks for looking into this.  

Will

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