update method

@override void update()

This method can be used if there are things that needs to be prepared in each tick.

Implementation

@override
void update() {
  // Between two ticks the hitboxes only move a little, so [items] is
  // always nearly sorted: an insertion sort runs in close to linear time
  // here, where a general-purpose sort would pay its full O(n log n) on
  // every tick. The comparator is a static tear-off, so nothing is
  // allocated per tick.
  insertionSort(items, compare: _compareMinX);
}