private async Task GenerateFractlAsync(int maxIterations)
{
Stopwatch sw = Stopwatch.StartNew();
Mandelbrot mandelbrotGenerator = new Mandelbrot();
double increment = scale / viewWidth;
double left = center.Real - (viewWidth / 2) * increment;
double row = center.Imaginary - (viewHeight / 2) * increment;
var tasks = PartitionRows(Environment.ProcessorCount)
.Select(range => Task.Run(() =>
{
double startRow = row + (range.Item1 * increment);
for (int y = range.Item1; y < range.Item2; y++)
{
mandelbrotGenerator.RenderRow(left, startRow, increment,
maxIterations, colors, memoryBuffer, (int)(y * viewWidth), (int)viewWidth);
startRow += increment;
}
})).ToArray();
await Task.WhenAll(tasks);
RefreshScreen();
sw.Stop();
timer.Text = sw.Elapsed.ToString();
}
private async Task GenerateFractlAsync(int maxIterations, CancellationToken cancelToken)
{
Stopwatch sw = Stopwatch.StartNew();
Mandelbrot mandelbrotGenerator = new Mandelbrot();
double increment = scale / viewWidth;
double left = center.Real - (viewWidth / 2) * increment;
double row = center.Imaginary - (viewHeight / 2) * increment;
var tasks = PartitionRows(Environment.ProcessorCount)
.Select(range => Task.Run(() =>
{
double startRow = row + (range.Item1 * increment);
for (int y = range.Item1; y < range.Item2; y++)
{
cancelToken.ThrowIfCancellationRequested();
mandelbrotGenerator.RenderRow(left, startRow, increment,
maxIterations, colors, memoryBuffer, (int)(y * viewWidth), (int)viewWidth);
startRow += increment;
}
}, cancelToken)).ToArray();
Task renderTask = null;
try
{
renderTask = Task.WhenAll(tasks);
await renderTask;
}
catch (OperationCanceledException)
{
// Canceled -return
return;
}
catch // All exceptions
{
// Pull out all exceptions
AggregateException aex = renderTask.Exception;
if (aex != null)
{
string message = string.Join(Environment.NewLine,
aex.Flatten().InnerExceptions.Select(x => x.Message));
await DisplayAlert("Render Data", message, "OK");
}
}
RefreshScreen();
sw.Stop();
timer.Text = sw.Elapsed.ToString();
}
private async Task GenerateFractlAsync(int maxIterations)
{
Stopwatch sw = Stopwatch.StartNew();
Mandelbrot mandelbrotGenerator = new Mandelbrot();
double increment = scale / viewWidth;
double left = center.Real - (viewWidth / 2) * increment;
double row = center.Imaginary - (viewHeight / 2) * increment;
var tasks = PartitionRows(Environment.ProcessorCount)
.Select(range => Task.Run(() =>
{
double startRow = row + (range.Item1 * increment);
for (int y = range.Item1; y < range.Item2; y++)
{
mandelbrotGenerator.RenderRow(left, startRow, increment,
maxIterations, colors, memoryBuffer, (int)(y * viewWidth), (int)viewWidth);
startRow += increment;
}
// Throw an exception to pass data back out to task owner
throw new Exception(string.Format("{0}: rows {1} to {2}",
Environment.CurrentManagedThreadId, range.Item1, range.Item2));
})).ToArray();
Task renderTask = null;
try
{
renderTask = Task.WhenAll(tasks);
await renderTask;
}
catch
{
// Pull out exceptions from all tasks
AggregateException aex = renderTask.Exception;
if (aex != null)
{
string message = string.Join(Environment.NewLine,
aex.Flatten().InnerExceptions.Select(x => x.Message));
await DisplayAlert("Render Data", message, "OK");
}
}
RefreshScreen();
sw.Stop();
timer.Text = sw.Elapsed.ToString();
}
private void GenerateFractl(int maxIterations)
{
Stopwatch sw = Stopwatch.StartNew();
Mandelbrot mandelbrotGenerator = new Mandelbrot();
double increment = scale / viewWidth;
double left = center.Real - (viewWidth / 2) * increment;
double row = center.Imaginary - (viewHeight / 2) * increment;
for (int y = 0; y < viewHeight; y++)
{
mandelbrotGenerator.RenderRow(left, row, increment,
maxIterations, colors, memoryBuffer, (int)(y * viewWidth), (int)viewWidth);
row += increment;
}
RefreshScreen();
sw.Stop();
timer.Text = sw.Elapsed.ToString();
}
