from_lifetime function

void from_lifetime(Particle p)

Implementation

void from_lifetime(Particle p) {
  if (p.lifetime == null) return;
  final t = p.lifetimeProgress;

  final colorCurveT = p.colorCurve.transform(t);
  final gradient = p.colorGradient;
  if (gradient != null && gradient.length >= 2) {
    p.updateCurrentColor = _lerpGradient(gradient, colorCurveT);
  } else if (p.endColor != null) {
    p.updateCurrentColor = Color.lerp(p.color, p.endColor!, colorCurveT)!;
  }

  if (p.endScale != null) {
    final st = p.scaleCurve.transform(t);
    p.updateCurrentScale = p.startScale + (p.endScale! - p.startScale) * st;
  }

  if (p.endOpacity != null) {
    final ot = p.opacityCurve.transform(t);
    if (p.startOpacity == 0.0 && p.endOpacity == 0.0) {
      p.updateCurrentOpacity =
          (ot <= 0.5 ? ot * 2.0 : (1.0 - ot) * 2.0).clamp(0.0, 1.0);
    } else {
      p.updateCurrentOpacity =
          (p.startOpacity + (p.endOpacity! - p.startOpacity) * ot)
              .clamp(0.0, 1.0);
    }
  }
}