[Goo] FPS Starter Kit
Released
Animation/DecayVector2.cs
A small value type that smooths a 2D vector toward a target using exponential decay. It stores current and target Vector2, a halflife, provides Update(dt) to advance the decay, IsSettled to check close-to-target, and Tick(dt) which advances and returns whether it is still moving.
using System;
using Sandbox;
namespace Goo.Animation;
public record struct DecayVector2
{
public Vector2 Current;
public Vector2 Target;
public float Halflife;
public DecayVector2(Vector2 initial, float halflife)
{
Current = initial;
Target = initial;
Halflife = halflife;
}
public void Update(float dt) =>
Current = new Vector2(
MathX.ExponentialDecay(Current.x, Target.x, Halflife, dt),
MathX.ExponentialDecay(Current.y, Target.y, Halflife, dt));
public bool IsSettled =>
MathF.Abs(Target.x - Current.x) < 0.0001f &&
MathF.Abs(Target.y - Current.y) < 0.0001f;
/// <summary>Advances by dt and returns true while still moving; chain calls with | (not ||) so every damper advances each frame.</summary>
public bool Tick(float dt) { Update(dt); return !IsSettled; }
}