# C#: Variations

Source: https://tweens.gd/csharp/variations/

Derive a stronger, slower, or later version of one definition. Factors multiply its values and deltas add to them, when playback starts.

Examples use `using Godot;` and `using tweens.gd;` in a Node method, with targets inside the scene tree.

## Scale a motion

```csharp
var recoil = new Tweens.Position2DX
{
    By = -12,
    Duration = 0.2,
    Ease = InOut.Quad,
    PingPong = true,
};

sprite1.Tween(recoil with { FactorBy = 2 });         // 24 pixels back
sprite2.Tween(recoil with { FactorDuration = 1.5 }); // 0.3 seconds each way
sprite3.Tween(recoil with { DeltaDelay = 0.1 });     // 0.1 seconds later
```

Each copy follows the original: tune `recoil`, and every variation changes with it. Setting `Duration` on a copy instead replaces the duration outright.

## Vary the current value

Leave the destination out, and `FactorTo` scales the value captured at the start:

```csharp
var beat = new Tweens.Scale2D
{
    FactorTo = 1.2,
    Duration = 0.15,
    Ease = InOut.SmootherStep,
    PingPong = true,
};

sprite.Tween(beat);
```

The sprite grows to 120% of its current scale and back.

## Change the pacing

`Skew` shifts the outward leg’s balance between its In and Out halves; `Weks` does the same for the return. Both run from 0 (fast start) to 1 (fast finish), and 0.5 keeps the ease as written. Set `Weks = 1 - Skew` to retrace the outward curve.

**Try it:** change the shared recoil kick, and Hit and Crit follow it. Then move `Skew`: the pacing changes, the distance doesn’t.

Interactive preview: https://tweens.gd/csharp/variations/

Paired eases only

`Skew` and `Weks` apply to paired In/Out eases. Single legs, custom functions, and Godot Curves keep their shape.

[Endpoint reference](https://tweens.gd/csharp/api/endpoints/)Every factor and delta, and how they combine.