lerp static method

BoxShadow? lerp(BoxShadow? a, BoxShadow? b, double t)

Linearly interpolate between two gradient shadows.

The arguments must not be null.

Implementation

static BoxShadow? lerp(BoxShadow? a, BoxShadow? b, double t) {
  if (identical(a, b)) {
    return a;
  }
  if (a == null) return b!.scale(t);
  if (b == null) return a.scale(1.0 - t);

  if (a is GradientShadow && b is GradientShadow) {
    return GradientShadow(
      color: Color.lerp(a.color, b.color, t)!,
      gradient: Gradient.lerp(a.gradient, b.gradient, t)!,
      offset: Offset.lerp(a.offset, b.offset, t)!,
      blurRadius: ui.lerpDouble(a.blurRadius, b.blurRadius, t)!,
      spreadRadius: ui.lerpDouble(a.spreadRadius, b.spreadRadius, t)!,
      blurStyle: a.blurStyle == BlurStyle.normal ? b.blurStyle : a.blurStyle,
    );
  }
  return BoxShadow.lerp(a, b, t);
}