static public PartList Pack(PartList parts, BoardList boards, double sawkerf = 4, double boardMarginLength = 0, double boardMarginWidth = 0, double partPaddingLength = 0, double partPaddingWidth = 0)
{
// order the parts by Area, Ascending
var orderredParts = parts.OrderredByArea();
var oderredBoards = boards.OrderredByArea();
// add padding to parts
orderredParts.InflateAll(partPaddingWidth, partPaddingLength);
// init the bag for the solution
PartList completeSolution = new PartList();
// repeat until all parts are placed, or boards used up
int iteration = 0;
while (orderredParts.Count > 0 && oderredBoards.Count > 0)
{
// for this iteration, prepare to hold the best board's packing solution
PartList bestsolution = null;
double bestsolutioncoverage = 0;
// we will pack each board in its own thread, so we need to track the threads
List <Task> threads = new List <Task>();
// loop through the available board sections
for (BoardNode iBoard = oderredBoards.Head; iBoard != null; iBoard = iBoard.Next)
{
threads.Add(
Task.Factory.StartNew((o) =>
{
Thread.CurrentThread.Priority = ThreadPriority.Highest;
// for every board
BoardNode tiBoard = new BoardNode((BoardNode)o);
// subtract the margin from the board
tiBoard.Inflate(-boardMarginWidth, -boardMarginLength);
// init a packer object
Packer iPacker = new Packer()
{
boardArea = tiBoard.Area,
sawkerf = sawkerf
};
// pack the board recursively, starting at the first part and an empty solution
iPacker.Pack_recursive(new PartList(orderredParts), new BoardList(tiBoard), new PartList(), 0);
//Trace.WriteLine($"......in iteration {iteration+1}: Board {iPacker.currentSolution.Head.Container} packed to {iPacker.currentSolutionArea/iPacker.boardArea:0 %} :\r\n{iPacker.currentSolution.ToString()}");
// replace the best solution if this one is better
lock (lck)
if (iPacker.currentSolutionArea / iPacker.boardArea > bestsolutioncoverage)
{
bestsolutioncoverage = iPacker.currentSolutionArea / iPacker.boardArea;
bestsolution = iPacker.currentSolution;
}
}, iBoard));
}
Task.WaitAll(threads.ToArray());
// if no board could be packed, stop
if (bestsolutioncoverage == 0)
{
Trace.WriteLine("STOPPING: Non of the parts left to place would fit any of the available boards...");
break;
}
boards[bestsolution.Head.Container].Solution = new PartList(bestsolution);
// report the best packking for this iteration
Trace.WriteLine($"Best solution for iteration {++iteration}: Board {bestsolution.Head.Container} packed to {bestsolutioncoverage:0 %} :\r\n{bestsolution.ToString()}");
// remove best packed board from the list of available boards
oderredBoards.Remove(bestsolution.Head.Container);
// remove the parts packed from the list of required parts
for (PartNode iPart = bestsolution.Head; iPart != null; iPart = iPart.Next)
{
orderredParts.Remove(iPart.ID);
}
// add this partial solution to the complete solution...
completeSolution.Append(bestsolution);
}
// return the solution
return(completeSolution);
}
