/// <summary>
/// Starts the task.
/// </summary>
/// <param name="dataSet">The list of objects that to be converted.</param>
/// <param name="distanceMetric">The distance metric used to scale down dimensions.</param>
public void Start(IdentifiableDataPointCollection dataSet, IDistanceMetric distanceMetric)
{
var args = new TaskRunnerArgumentSet {
Data = dataSet, DistanceMetric = distanceMetric
};
var task = Task.Factory.StartNew <DataConversionResult>(TaskRunner, args);
// Make sure Success and Failure events are run within the caller thread.
TaskScheduler currentContext = TaskScheduler.FromCurrentSynchronizationContext();
task.ContinueWith(TaskComplete, currentContext);
task.ContinueWith(TaskFaulted, CancellationToken.None, TaskContinuationOptions.OnlyOnFaulted, currentContext);
}
private static DataConversionResult TaskRunner(object arg)
{
TaskRunnerArgumentSet options = arg as TaskRunnerArgumentSet;
DistanceMatrix distanceMatrix = new DistanceMatrix(options.Data, options.DistanceMetric);
MultiDimensionalScaling mds = new MultiDimensionalScaling(distanceMatrix);
Matrix coordinateMatrix = mds.Calculate();
List <DrawableDataPoint> drawableDataPoints = new List <DrawableDataPoint>();
for (int col = 0; col < coordinateMatrix.Columns; col++)
{
double x = coordinateMatrix[0, col];
double y = coordinateMatrix[1, col];
IdentifiableDataPoint originalDataPoint = options.Data[col];
drawableDataPoints.Add(new DrawableDataPoint(originalDataPoint, x, y));
}
var dataPoints = drawableDataPoints.OrderBy(d => d.Group).ToList();
return(new DataConversionResult(dataPoints, distanceMatrix));
}
