public IEnumerable <CuttingInstructions> OptimizeFromStock(StockManager stock)
{
var results = new List <CuttingInstructions>();
CuttingInstructions instructions;
do
{
instructions = GetBestInstructionsForRemainingPieces(stock);
if (instructions != null)
{
results.Add(instructions);
}
} while (instructions != null);
return(results);
}
private void DeductItems(StockManager stock, CuttingInstructions cuttingInstructions)
{
stock.DeductFromStock(cuttingInstructions.StockLength,
cuttingInstructions.Cost,
cuttingInstructions.Quantity);
foreach (var cutItem in cuttingInstructions.Items)
{
var item = Items.SingleOrDefault(i => i.Length == cutItem.Length);
if (item == null)
{
throw new InvalidOperationException("No item of that length " + cutItem.Length + " exists.");
}
item.ReduceQuantityBy(cutItem.Quantity * cuttingInstructions.Quantity);
}
}
private CuttingInstructions GetBestInstructionsForRemainingPieces(StockManager stock)
{
if (!HasRemainingPieces)
{
return(null);
}
CuttingInstructions best = null;
foreach (var stockItem in stock.Items)
{
var current = new CuttingInstructions(stock.ShapeId,
stockItem.Length,
stockItem.Cost,
stockItem.Kerf,
Items.Where(i => i.Quantity > 0)
.Select(i => i.Clone()));
current.Optimize();
if (best == null)
{
best = current;
}
else
{
if (current.Waste < best.Waste)
{
best = current;
}
else if (current.Waste == best.Waste)
{
var currentNumberOfCuts = current.Items.Sum(i => i.Quantity);
var bestNumberOfCuts = best.Items.Sum(i => i.Quantity);
if (currentNumberOfCuts < bestNumberOfCuts)
{
best = current;
}
else if (currentNumberOfCuts == bestNumberOfCuts && current.StockLength > best.StockLength)
{
best = current;
}
}
}
}
if (best != null)
{
DeductItems(stock, best);
}
return(best);
}
