Physics

Changing the transformation matrix manually is pretty clumsy. If you want to setup some constant animation then you can apply physics to a scene node. To do this you create a new instance of the class twodee.Physics and apply it to the scene node (or multiple nodes) by passing the physics object to the setPhysics() method of the scene node:

var physics = new twodee.Physics();
node.setPhysics(physics);     

Now you can call various methods to change the physics of the node (or nodes). Here is a list of the most important methods (See API doc for a full list of methods):

• getVelocity(): Returns the velocity vector (A twodee.Vector instance) which can be manipulated to set the X and Y velocity.
• getAcceleration(): Returns the acceleration vector (A twodee.Vector instance) which can be manipulated to set the X and Y acceleration.
• setSpin(): Rotates the node by the specified number of rad per second.
• setSpinAcceleration(): Sets the spin acceleration in RAD per square second.
• setScaling(): Scales the node by the specified multitudes per second.

This small example shows an asteroid with an applied spin:

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