Easer

using Clockwork.Animation

The Easer class was created to help with simple programmatic animations, and uses the Curves class to support it. Check it out:

Easer starEaser = scene.AddEntity(new Easer(easeSeconds));
starEaser.Curve = Curves.SmoothStep;
starEaser.Easing += EaseShootingStar;
starEaser.Start();

void EaseShootingStar(Easer easer)
{
    star.Position = easer.EaseVector2(startPosition, endPosition);
    star.Rotation = easer.EaseFloat(startRotation, endRotation);
    star.Color = easer.EaseColor(startColor, endColor);
}

This moves a star, rotates it, and interpolates its color. Then the easer kills itself when it is finished (or not, if you set RemoveOnFinished to false). You can also tell the easer to repeat itself with the Rewind property.

The easer exposes Progress (0 to 1, linear) and CurveProgress (curve-adjusted), and has interpolation helpers for common types:

• EaseFloat(from, to)
• EaseVector2(from, to)
• EaseVector3(from, to)
• EaseQuaternion(from, to)
• EaseColor(from, to)

You can also Skip() an easer to jump it to the end on the next update, or subscribe to the Finished event:

starEaser.Finished += OnStarArrived;

Transform2DEaser

There is also a Transform2DEaser class that inherits from easer and makes it super simple to apply easing to any objects with a Transform2D field:

Transform2DEaser mover = scene.AddEntity(new Transform2DEaser(myEntity.Transform, 1f));
mover.Curve = Curves.SmoothStep;
mover.TargetWorldPosition = destination;
mover.Start();

It automatically captures the transform's current state when constructed. If you need to recapture (for instance, chaining multiple eases), call SerializeTransform(). The easer handles parent-child transform relationships correctly.