Factor out BallLayer into a BallSystemNode

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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Closed brandonLi8 closed 4 years ago

brandonLi8 commented 4 years ago

Factor out BallLayer into a BallSystemNode instead of cramming into CollisionLabScreenView.

brandonLi8 commented 4 years ago

Done in the commits above. Closing.