public bool ConsiderAlternateCrop(BitmapCrop newCrop)
{
// If the new crop's no different, this is pretty easy!
if (newCrop.CompareTo(this.CurrentCrop) == 0)
{
return(false);
}
BitmapCrop acceptedCrop = new BitmapCrop();
if (newCrop.Top < this.CurrentCrop.Top ||
newCrop.Left < this.CurrentCrop.Left ||
newCrop.Bottom < this.CurrentCrop.Bottom ||
newCrop.Right < this.CurrentCrop.Right)
{
// In this case, we're going to accept the new crop because it is
// indicating that the current crop is cropping out pixels that should
// otherwise be shown.
// However, we'll only accept the crop sections that "should" be fixed.
acceptedCrop.Top = Math.Min(newCrop.Top, this.CurrentCrop.Top);
acceptedCrop.Left = Math.Min(newCrop.Left, this.CurrentCrop.Left);
acceptedCrop.Bottom = Math.Min(newCrop.Bottom, this.CurrentCrop.Bottom);
acceptedCrop.Right = Math.Min(newCrop.Right, this.CurrentCrop.Right);
}
else
{
// Is this a new candidate? If so, we'll put it under consideration.
if (this.lastCandidate == null || newCrop.CompareTo(lastCandidate) != 0)
{
this.lastCandidate = new BitmapCrop();
this.lastCandidate.Mimic(newCrop);
this.lastCandidateConsideredTime = PerformanceCounter.Current;
return(false);
}
// Has it been long enough to use this new candidate?
double time = (PerformanceCounter.Current - this.lastCandidateConsideredTime) / (double)PerformanceCounter.Frequency;
if (time < ConsiderationTimeInSeconds)
{
return(false);
}
// We're going to accept this as the new crop.
acceptedCrop.Mimic(newCrop);
}
//////////////////
// New candidate accepted.
this.CurrentCrop.Mimic(acceptedCrop);
this.lastCandidate = null;
return(true);
}
public CropHelper()
{
CurrentCrop = new BitmapCrop();
}
