apply method

@override void apply(Buffer source, Buffer target, double dt)

Implementation

@override
void apply(Buffer source, Buffer target, double dt) {
  final width = source.width();
  final height = source.height();
  if (width <= 0 || height <= 0) return;

  final effectiveDt = dt <= 0 ? 1 / 60 : dt;
  _time += effectiveDt;
  final phaseOffset = phase + (_time * speed * math.pi * 2.0);

  for (var y = 0; y < height; y++) {
    for (var x = 0; x < width; x++) {
      final dx = math.sin((y * xFrequency) + phaseOffset) * xAmplitude;
      final dy = math.sin((x * yFrequency) + phaseOffset * 0.73) * yAmplitude;
      final sx = (x + dx).round().clamp(0, width - 1);
      final sy = (y + dy).round().clamp(0, height - 1);
      final cell = source.cellAt(sx, sy);
      if (cell == null || cell.width == 0) {
        target.setCell(x, y, Cell.emptyCell());
      } else {
        target.setCell(x, y, cell);
      }
    }
  }
}