private async void CalculateAreaForSelectedPolygon()
{
if (Calculator == null)
{
throw new InvalidOperationException("No calculator available");
}
if (SelectedPolygon == null)
{
throw new InvalidOperationException("No polygon selected");
}
if (IsCalculatingArea)
{
throw new InvalidOperationException("Calculation is already running");
}
CancelSource = new CancellationTokenSource();
Area = null;
IsCalculatingArea = true;
try
{
Area = await Calculator.CalculateAreaAsync(SelectedPolygon.Points, CancelSource.Token,
new Progress <double>(progress => Progress = progress));
}
catch (OperationCanceledException)
{
Area = null;
}
IsCalculatingArea = false;
CancelSource = null;
}
private async void CalculateAreaForSelectedPolygon()
{
if (IsCalculatingArea)
{
throw new InvalidOperationException("Calculation already running");
}
if (AreaCalculator == null)
{
throw new InvalidOperationException("No Area Calculator defined");
}
if (SelectedPolygon == null)
{
throw new InvalidOperationException("No polygon selected");
}
IsCalculatingArea = true;
using (CancelSource = new CancellationTokenSource())
{
try
{
Area = await AreaCalculator.CalculateAreaAsync(
SelectedPolygon.Points,
CancelSource.Token,
new Progress <AreaCalculationProgress>(p =>
{
Progress = p.ProgressPercentage;
Area = p.AreaIntermediateResult;
}));
}
catch (OperationCanceledException)
{
// Add logging later...
}
}
IsCalculatingArea = false;
}