split method Null safety

void split()

Split the node into 4 subnodes (ne, nw, sw, se)

Implementation

void split() {
  final nextDepth = depth + 1;
  final subWidth = bounds.width / 2;
  final subHeight = bounds.height / 2;
  final x = bounds.x;
  final y = bounds.y;

  /// Top-right node
  final ne = Quadtree<O>(
    Rect(
      x: x + subWidth,
      y: y,
      width: subWidth,
      height: subHeight,
    ),
    maxObjects: maxObjects,
    maxDepth: maxDepth,
    depth: nextDepth,
  );

  /// Top-left node
  final nw = Quadtree<O>(
    Rect(
      x: x,
      y: y,
      width: subWidth,
      height: subHeight,
    ),
    maxObjects: maxObjects,
    maxDepth: maxDepth,
    depth: nextDepth,
  );

  /// Bottom-left node
  final sw = Quadtree<O>(
    Rect(
      x: x,
      y: y + subHeight,
      width: subWidth,
      height: subHeight,
    ),
    maxObjects: maxObjects,
    maxDepth: maxDepth,
    depth: nextDepth,
  );

  /// Bottom-right node
  final se = Quadtree<O>(
    Rect(
      x: x + subWidth,
      y: y + subHeight,
      width: subWidth,
      height: subHeight,
    ),
    maxObjects: maxObjects,
    maxDepth: maxDepth,
    depth: nextDepth,
  );

  nodes
    ..[Quadrant.ne] = ne
    ..[Quadrant.nw] = nw
    ..[Quadrant.sw] = sw
    ..[Quadrant.se] = se;
}