Easing

The Easing class is used to define how a value changes over time as it scales from 0 to 1. It is used by the Operation class to define how to interpret the progress value on a scaled context.

There are two ways to define how an Easing definition behaves. The first is to use any of the built-in interpolation functions that are part of the Dropl Package. These are standard easing functions that are used in many animation libraries. The second is to define a custom Easing behavior using an AnimationCurve object.

// Using a built-in easing function
Easing easing = new Easing(Interpolations.IN_SINE);

// or using an AnimationCurve
// assume that a serialized AnimationCurve is assigned to the variable curve
Easing easing = new Easing(curve);

// then the value can be evaluated using the Evaluate method
float value = easing.Evaluate(0.5f);

// and can be remapped to a different range
float remappedValue = easing.Evaluate(0.5f, -10, 10);

It’s also important to note that both Interpolations and AnimationCurve objects can be passed directly to functions that accept an Easing object. This is because the Easing class has an implicit conversion operator for both of these types.

void SomeFunction(Easing easing) { ... }

// Interpolations
SomeFunction(Interpolations.IN_SINE);

// AnimationCurve
SomeFunction(curve);

Available Easing Functions

• LINEAR
• IN_SINE
• OUT_SINE
• IN_OUT_SINE
• IN_QUAD
• OUT_QUAD
• IN_OUT_QUAD
• IN_CUBIC
• OUT_CUBIC
• IN_OUT_CUBIC
• IN_POWER
• OUT_POWER
• IN_OUT_POWER
• IN_BOUNCE
• OUT_BOUNCE
• IN_OUT_BOUNCE
• IN_ELASTIC
• OUT_ELASTIC
• IN_OUT_ELASTIC
• IN_BACK
• OUT_BACK
• IN_OUT_BACK
• IN_CIRC
• OUT_CIRC
• IN_OUT_CIRC

To learn more about these easing functions, check out the easing functions website. Although for internal use, have a look at the Helpers subclass in Easing to see how these functions are implemented and can be used outside of the Dropl Package.