IInterpolateFloatUpdate

Inheritance 2 ancestors · 1 sibling · 2 descendants

• IValueUpdateModifier
  • IFloatUpdateModifier
    • DelayFloatUpdate
    • IInterpolateFloatUpdatecurrent
      • InterpolateDeltaFloatUpdate
      • InterpolateDurationFloatUpdate

Class Documentation

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A float modifier that eases the displayed value to the target value along a curve. The concrete class sets how fast the ease runs: InterpolateDurationFloatUpdate takes a time and InterpolateDeltaFloatUpdate takes a speed.

When the ease starts, the modifier stores the displayed value as the start value and computes a rate, the fraction of the ease per second. On each update:

1. The elapsed time grows by the time of the last frame.
2. The progress t is the elapsed time times the rate, clamped to 0-1.
3. The displayed value is start + (target - start) * Ease(t), with the curve of Easing.
4. When the displayed value is within 1e-9 of the target value, the modifier sets it to the target value and finishes.

When the target value moves during the ease, the current displayed value becomes the new start value and the modifier computes the rate again for the new target.

Properties

Easing

U8

Documentation Edit documentation

The curve of the ease. t is the progress from 0 to 1. At t = 1 every curve returns 1.

Value	Curve	Formula
0	Linear	t
1	Instant	1: the target value at the first step
2	SmoothStep	t^2 (3 - 2t)
3	SmootherStep	t^3 (t (6t - 15) + 10)
4	QuadIn	t^2
5	QuadOut	-t (t - 2)
6	QuadInOut
7	CubicIn	t^3
8	CubicOut
9	CubicInOut
10	QuartIn	t^4
11	QuartOut	1 - (t - 1)^4
12	QuartInOut
13	QuintIn	t^5
14	QuintOut
15	QuintInOut
16	SineIn	1 - cos(t pi / 2)
17	SineOut	sin(t pi / 2)
18	SineInOut
19	CircIn	1 - sqrt(1 - t^2)
20	CircOut	sqrt((2 - t) t)
21	CircInOut
22	ExpoIn	2^(10 (t - 1))
23	ExpoOut	1 - 2^(-10 t)
24	ExpoInOut
25	ElasticIn
26	ElasticOut
27	ElasticInOut
28	BackIn	t^3 - t sin(t pi)
29	BackOut
30	BackInOut
31	BounceIn
32	BounceOut
33	BounceInOut

Notes

• A value above 33 returns 0 until t = 1. The displayed value then stays at the start value for the whole ease and jumps to the target value at the end.

Easing