getGradientInBetween static method

List<GuiGradientColor> getGradientInBetween(double stop, List<GuiGradientColor> fromGradient, double fromStop, List<GuiGradientColor> toGradient, double toStop,)

Generate a gradient in between two other gradients, where stop is a value in between fromStop to toStop. The gradient colors are interpolated from fromGradient and toGradient.

Implementation

static List<GuiGradientColor> getGradientInBetween(
    double stop,
    List<GuiGradientColor> fromGradient,
    double fromStop,
    List<GuiGradientColor> toGradient,
    double toStop) {
  // fromgrad and tograd must have the same number of elements (as achieved after normalizing each gradient to have all stops)
  List<GuiGradientColor> gradient = <GuiGradientColor>[];
  if (stop == fromStop) return fromGradient;
  if (stop == toStop || fromStop == toStop) return toGradient;

  // else compute gradient based on location of stop between fromStop and toStop.
  double t = (stop - fromStop) / (toStop - fromStop);
  for (int i = 0; i < fromGradient.length; i++) {
    gradient.add(GuiGradientColor(
        Color.lerp(fromGradient[i].color, toGradient[i].color, t)!,
        fromGradient[i].stop));
  }
  return gradient;
}