updateVisibility method

void updateVisibility(
  1. Size bounds
)

Implementation

void updateVisibility(Size bounds) {
  // Include a margin to account for particles near the edges of the viewport.
  const margin = 50.0;
  // Use local variables to avoid repeated property access
  final double px = position.dx;
  final double py = position.dy;

  isVisible =
      px >= -margin &&
      px <= bounds.width + margin &&
      py >= -margin &&
      py <= bounds.height + margin;
}