The new curve state property lets you specify a curve function in order to achieve a wide variety of different kinds of non-linear fade effects, including effects like bounce, springiness, wobble, elasticity, etc.

When setting a value for the curve property, you can provide your own hand-rolled curve function, or you can pick from the many convenient curve function generators provided in the Uize.Curve and Uize.Curve.Rubber modules. Even more complex curve functions can be generated using the versatile curve function modifiers provided in the Uize.Curve.Mod module. Now there's no more excuse to have boring animations.

With the addition of the more versatile curve state property, the acceleration and deceleration state properties have been deprecated.

These properties are still supported for backwards compatibility, but will at some point be eliminated. Setting values for these properties will have the effect of creating a curve function using the new Uize.Fade.celeration static method and then setting the curve function created as the value of the new curve property.

With the introduction of the new curve state property and the deprecation of the acceleration and deceleration state properties, the new Uize.Fade.celeration static method has been introduced as a way of generating the same type of acceleration/deceleration curve functions that were implied by setting values of the acceleration and deceleration properties.

The implementation of the inProgress state property has been improved to be more robust.

It is now possible to start and stop fades simply by setting the value of the inProgress state property - one no longer has to use the start and stop instance methods. To start a fade you could use the statement myFade.set ({inProgress:true}), and to stop a fade you could use the statement myFade.set ({inProgress:false}). Using the start instance method can still be useful in some cases, as it has the effect of first stopping the current fade. You can also use its optional fadePropertiesOBJ parameter to specify properties for the new fade process.