User suggestion: show velocity of COM

phetsims / collision-lab

"Collision Lab" is an educational simulation in HTML5, by PhET Interactive Simulations.

GNU General Public License v3.0

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User suggestion: show velocity of COM #9

Closed arouinfar closed 4 years ago

arouinfar commented 5 years ago

From the sim suggestion doc on Unfuddle:

After using the collision lab with my kids, I had a suggestion for you: my students couldn't clearly see that the COG always moves with a constant speed. Could you add an option to see a vector arrow for the magnitude of the COG's velocity? (Otherwise, when I get up to speed on the code, you may force me to tinker with the source code myself!)

arouinfar commented 5 years ago

I'm not so sure that we want to display the velocity vector over the COM, but another alternative would be to show the readout of the speed when Values is checked. Marking for design meeting to check in with the team.

arouinfar commented 4 years ago

Discussed int eh 6/4/20 design meeting.

We decided to display the speed of the COM marker when Values in on. Off to @brandonLi8 for implementation.

brandonLi8 commented 4 years ago

Done in the commits above.

Up to @arouinfar to decide if we should close. I think the team wanted to see it in action to decide if it was too busy or not.

arouinfar commented 4 years ago

Looks good @brandonLi8. I'll tag for team review at the next design meeting.

arouinfar commented 4 years ago

Discussed in 6/25/20 design meeting

[x] Change color of transparent background to match COM color
[x] Reduce padding between COM marker and value label to match padding used for balls

brandonLi8 commented 4 years ago

Done in the commits above.

Closing.