The group object

[Bruce Sherwood]

Thanks to major help from Steve Spicklemire, plus useful comments by Ruth Chabay, there is a new feature in Web VPython (not yet available in the vpython module for installed Python). You can now create a "group" and place objects in that group. You can then move all the grouped objects together, with a single statement. In addition to moving the group, you can rotate the group, make all the objects invisible or visible, or change the colors of the objects.

Because this is brand new, the documentation is not yet in the Help, but here are two sample programs whose code you can examine to get the main ideas:

https://www.glowscript.org/#/user/Bruce_Sherwood/folder/Examples/program/group-car

https://www.glowscript.org/#/user/Bruce_Sherwood/folder/Examples/program/group-miscellany

Bruce

[LORI REUBENSTEIN]

I am very excited to see this new group option.  I miss frames.  However, I could not get it to work.  

I copied the car example into my local trinket and it said that group was undefined.

Lori

[Harlan Gilbert]

Works fine for me.  Are you using Web VPython 3.2?  Any earlier version will not function.

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Harlan Gilbert, Ph.D.

High School Math, Physics, Computer Science, and Philosophy Teacher

Collegium Chair

Green Meadow Waldorf High School

Chestnut Ridge, NY 10977

(845) 356-2514 x. 320

[LORI REUBENSTEIN]

This doesn't work for me:

Web VPython 3.2

g = group()

box(group = g)

I get the message:  group is not defined At or near line 3:

[Harlan Gilbert]

Odd; both your and Bruce's programs work fine for me.

To view this discussion on the web visit https://groups.google.com/d/msgid/glowscript-users/a20f8581-f114-4744-93fa-c9e30ec0cd55n%40googlegroups.com.

[Bruce Sherwood]

One possibility is that you need to clear the browsing data on your browser. I admit that it seems a long shot, given that the group feature has been available since Jan. 12, but it's the only thing I can think of that could explain this. You might also try a different browser.

Bruce

[Bruce Sherwood]

Oops. I do see what the problem is. You are writing programs at trinket.io, and it takes a while before a new feature at webvpython.org gets added to trinket.io by the Trinket staff.

Bruce

[LORI REUBENSTEIN]

I figured it was something like that.

Thank you

Lori

On Mon, Feb 5, 2024 at 5:49 PM Bruce Sherwood <bruce.s...@gmail.com> wrote:

Oops. I do see what the problem is. You are writing programs at trinket.io, and it takes a while before a new feature at webvpython.org gets added to trinket.io by the Trinket staff.

Bruce

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Lori Reubenstein

Math and Computer Science Teacher

Billerica Memorial High School