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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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Balls disappear if position changed with a mouse on 1D screens #138

Closed arouinfar closed 4 years ago

arouinfar commented 4 years ago

For https://github.com/phetsims/QA/issues/524

Observed in dev.33, but not in dev.32. Possibly related to #136?

In the Intro and Explore 1D screens, changing the position of a ball with the mouse will cause it to disappear when play is pressed. It happens if moved left or right, by a lot or just a little. The same does not occur if the position is changed with the keypad. It also doesn't seem to happen on the 2D screens, even if the position change is in 1D.

Example 1:

  1. Intro screen
  2. Drag Ball 1 with the mouse (direction/amount doesn't seem to matter)
  3. Press play
  4. Ball 1 disappears immediately

Example 2:

  1. Intro screen
  2. Press play
  3. Grab Ball 2 and change its position
  4. Ball 2 disappears as soon as it is released
ariel-phet commented 4 years ago

I have observed in dev.33 on the explored 2D screen. The key is to have the grid activated. Observed on multiple platforms. This will occur with multiple balls, but the simplest case to reproduce is:

  1. Go to Explore 2D screen
  2. Click grid on
  3. Move ball 2
  4. Press the Play button, ball 2 will disappear
brandonLi8 commented 4 years ago

Should be fixed in the commit above. Back to @arouinfar for review in master.

arouinfar commented 4 years ago

I didn't see this when testing the latest dev.