private static float CalculateDampingFactor(float durationSeconds, ShakeSettings settings = null)
{
var minAmplitude = settings == null ? MinAmplitude : settings.MinAmplitude;
var frequency = settings == null ? Frequency : settings.Frequency;
var tAtLastPeak = (durationSeconds - Mathf.PI / 2) * frequency;
var tSquared = tAtLastPeak * tAtLastPeak;
return(tSquared / Mathf.Abs(1 + (Mathf.Cos(tAtLastPeak) / minAmplitude)));
}
private static float GetPositionOnCurve(float elapsedTime, float fadeTime, float dampingFactor, ShakeSettings settings = null)
{
var frequency = settings == null ? Frequency : settings.Frequency;
var noisePeriod1 = settings == null ? NoisePeriod1 : settings.NoisePeriod1;
var noisePeriod2 = settings == null ? NoisePeriod2 : settings.NoisePeriod2;
var noiseMagnitude = settings == null ? NoiseMagnitude : settings.NoiseMagnitude;
var t = elapsedTime * frequency;
var tF = fadeTime * frequency;
//Curve defined as (cos(t) + (cos(t*p1) + cos(t*p2)) * nM)/((t*t) / d + 1))
//cos(t) for basic spring effect
//+ (cos(t*p1) + cos(t*p2)) * nM adds two curves onto the orignal to create noise with p1/p2 controling their period and nM their magnitude
//((t*t) / d) + 1) dampens the curve over time with d controling the strength of the dampening effect and + 1 preventing a divide by 0
var damping = tF * tF / dampingFactor + 1;
var x = (Mathf.Cos(t) + (Mathf.Cos(t * noisePeriod1) + Mathf.Cos(t * noisePeriod2)) * noiseMagnitude) / damping;
return(x);
}
public static IEnumerator Shake(GameObject gameObject, ShakeController controller, ShakeSettings settings)
{
controller.Completed = false;
if (!controller.Continuous && Mathf.Approximately(0, controller.FadeOutTime))
{
controller.Completed = true;
yield break;
}
var relativePosition = Vector3.zero;
var fadeStart = GetCurrentTime(controller.UseScaledTime);
var startTime = GetCurrentTime(controller.UseScaledTime);
while (controller.Continuous || GetCurrentTime(controller.UseScaledTime) - fadeStart < controller.FadeOutTime)
{
if (controller.Continuous)
{
fadeStart = GetCurrentTime(controller.UseScaledTime);
}
var dampingFactor = CalculateDampingFactor(controller.FadeOutTime, settings);
var elapsedTime = GetCurrentTime(controller.UseScaledTime) - startTime;
var fadeTime = GetCurrentTime(controller.UseScaledTime) - fadeStart;
var curveValue = GetPositionOnCurve(elapsedTime, fadeTime, dampingFactor, settings);
var newRelativePosition = ApplyShake(gameObject, curveValue, relativePosition, controller.Magnitude, settings.AngleRange);
relativePosition = newRelativePosition;
yield return(null);
}
gameObject.transform.localPosition -= relativePosition;
controller.Completed = true;
}
