You can use mouse to drag the particle in the middle.
The other two particles will move with the dragged particle, if you click checkbox: sync
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Press the Alt key and the left mouse button to drag the applet off the browser and onto the desktop. This work is licensed under a Creative Commons Attribution 2.5 Taiwan License
Download EJS jar file(987.4kB):double click downloaded file to run it. (44 times by 8 users) , Download EJS source (5 times by 4 users) View EJS source