/// <summary>Starts calculating the mandelnumbers for the given area of the mandelbrot set.</summary>
/// <param name="args">The area to calculate</param>
public void Calculate(MandelAreaArgs args)
{
lock(locker)
{
// Abort any old workers
Abort();
// Make sure the x axis lies in the middel of a pixel
args.CenterOnXAxis();
// Create a new worker
worker = new Worker(args);
worker.OnWorkFinished = WorkFinished;
// Determine which indexes should be calculated and which can be determined using the symmetry of the mandelbrot set
int startIndex = 0;
int endIndex = args.CalcArea.Width * args.CalcArea.Height;
if(args.CalcAreaTop() > 0.0 && args.CalcAreaBottom() < 0.0)
{
if(args.CalcAreaTop() >= -args.CalcAreaBottom())
{
// `endIndex` = `rows of pixels above the x-axis including the x-axis` * `width in pixels`
endIndex = (int) Math.Min(endIndex, Math.Round((args.CalcAreaTop() / args.Scale + 1) * args.CalcArea.Width));
}
else
{
// `startIndex` = `rows of pixels above the x-axis excluding the x-axis` * `width in pixels`
startIndex = (int) Math.Round((args.CalcAreaTop() / args.Scale) * args.CalcArea.Width);
}
}
// Queue the work items
workFinished = new Dictionary<int, bool>((int) Math.Ceiling(((double) endIndex - startIndex) / WORK_PER_THREAD));
for(int i = startIndex; i < endIndex; i += WORK_PER_THREAD)
{
workFinished[i] = false;
ThreadPool.QueueUserWorkItem(new WaitCallback(worker.Work), new Worker.WorkerArgs(i, Math.Min(i + WORK_PER_THREAD, endIndex)));
}
}
}
