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View the demohere.

This fork has the following changes over the original:

• Spring Joint (simple version, suitable for simulation of soft bodies)

• Removed dependency on prototype.js
• Simple optimisations to core library, using for loops.
• Tried to avoid frequent instantiations of b2Vec2

The original box2d-js library is hosted onsourceforge.

It seems to be currently unmaintained and uses the HTML5 Canvas element for display.

• Use of SVGs instead of Canvas

  • Using jquery and jquery.svg
  • only create a shape for the first time, then use transformations
  • if static or sleeping then don't redraw

• throttling of step size and inter-frame delays, to achieve a target FPS.

• a new demo scene calleddrop to show off spring-joints.