Negative tension values can cause breaking behavior

[trevor-e]

I was playing around with the demo and it's a cool library. Feeling mischievous, I put some negative values in for tension to test the behavior. -1 and -10 seemed to work fine, but when I jumped up to -100 it quickly overloaded my browser's capabilities and crashed as the sample image outgrew its borders. Is it intended to accept negative values? Should there be some sort of cap or is it the developer's responsibility?

A quick Google search reveals that a negative tension may be breaking some laws of physics. Quoting an answer from a physics forum: "A negative tension, to my mind, would mean that the string should spontaneously blow itself apart."

[trevor-e]

Interesting behavior for inputting negative friction values too.

[willbailey]

Thanks for hacking around with it. It's not really intended to take negative values currently. I've been meaning to add support for spring constraints that keep an object away a fixed distance from center point, but haven't gotten to it yet.

[ghost]

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