private void Initialize()
{
topLeftThumb.ManipulationMode = topRightThumb.ManipulationMode = bottomLeftThumb.ManipulationMode = bottomRightThumb.ManipulationMode = selectRegion.ManipulationMode = ManipulationModes.Scale |
ManipulationModes.TranslateX | ManipulationModes.TranslateY;
//Thumb width and height is 20.
CropSelection = new CropSelection {
MinSelectRegionSize = 2 * 10, CropAspectRatio = CropAspectRatio
};
imageCanvas.DataContext = CropSelection;
}
private void SourceImage_SizeChanged(object sender, SizeChangedEventArgs e)
{
if (e.NewSize.IsEmpty || double.IsNaN(e.NewSize.Height) || e.NewSize.Height <= 0)
{
this.imageCanvas.Visibility = Visibility.Collapsed;
CropSelection.OuterRect = Rect.Empty;
CropSelection.SelectedRect = new Rect(0, 0, 0, 0);
}
else
{
this.imageCanvas.Visibility = Visibility.Visible;
this.imageCanvas.Height = e.NewSize.Height;
this.imageCanvas.Width = e.NewSize.Width;
CropSelection.OuterRect = new Rect(0, 0, e.NewSize.Width, e.NewSize.Height);
if (e.PreviousSize.IsEmpty || double.IsNaN(e.PreviousSize.Height) || e.PreviousSize.Height <= 0)
{
var rect = new Rect();
if (CropAspectRatio == AspectRatio.Custom)
{
rect.Width = e.NewSize.Width / (int)DefaultCropSelectionSize;
rect.Height = e.NewSize.Height / (int)DefaultCropSelectionSize;
}
else
{
var min = Math.Min(e.NewSize.Width, e.NewSize.Height);
rect.Width = rect.Height = min / (int)DefaultCropSelectionSize;
}
rect.X = (e.NewSize.Width - rect.Width) / (int)DefaultCropSelectionSize;
rect.Y = (e.NewSize.Height - rect.Height) / (int)DefaultCropSelectionSize;
CropSelection.SelectedRect = rect;
}
else
{
double scale = e.NewSize.Height / e.PreviousSize.Height;
//todo
CropSelection.ResizeSelectedRect(scale);
}
}
}
void ResizeCropSelection(Size newSize, Size previousSize)
{
double scale = newSize.Height / previousSize.Height;
CropSelection.ResizeSelectedRect(scale);
}