private List <Swatch> QuantizePixels(int maxColors)
{
// Create the priority queue which is sorted by volume descending. This means we always
// split the largest box in the queue
MaxHeap <Vbox> pq = new MaxHeap <Vbox>(new VBOX_COMPARATOR_VOLUME());
// To start, offer a box which contains all of the colors
pq.Add(new Vbox(0, mColors.Length - 1));
// Now go through the boxes, splitting them until we have reached maxColors or there are no
// more boxes to split
SplitBoxes(pq, maxColors);
// Finally, return the average colors of the color boxes
return(GenerateAverageColors(pq));
}
/// <summary>
/// Iterate through the Queue, popping ColorCutQuantizer.Vbox objects from the queue and splitting them.
/// Once split, the new box and the remaining box are offered back to the queue.
/// </summary>
/// <param name="queue">PriorityQueue to poll for boxes</param>
/// <param name="maxSize">Maximum amount of boxes to split</param>
private void SplitBoxes(MaxHeap <Vbox> queue, int maxSize)
{
while (queue.Count < maxSize)
{
Vbox vbox = queue.ExtractDominating();
if (vbox != null && vbox.CanSplit())
{
// First split the box, and offer the result
queue.Add(vbox.SplitBox());
// Then offer the box back
queue.Add(vbox);
}
else
{
// If we get here then there are no more boxes to split, so return
return;
}
}
}