public CropService(FrameworkElement adornedElement)
{
if (adornedElement == null)
{
return;
}
// Make sure menus are hidden when cropping
UILogic.UC.Close_UserControls();
// Show context menu
_ = new CropContextMenu();
canvas = new Canvas
{
Height = adornedElement.ActualHeight,
Width = adornedElement.ActualWidth
};
cropAdorner = new CropAdorner(adornedElement, canvas);
var adornerLayer = AdornerLayer.GetAdornerLayer(adornedElement);
Debug.Assert(adornerLayer != null, nameof(adornerLayer) + " != null");
adornerLayer.Add(cropAdorner);
var cropShape = new CropShape(
new Rectangle
{
Height = 4,
Width = 4,
Stroke = (SolidColorBrush)Application.Current.Resources["MainColorBrush"],
StrokeThickness = 2
}
);
cropTool = new CropTool(canvas);
createState = new CreateState(cropTool, canvas);
completeState = new CompleteState();
dragState = new DragState(cropTool, canvas);
currentToolState = completeState;
cropAdorner.PreviewMouseLeftButtonDown += AdornerOnMouseLeftButtonDown;
cropAdorner.PreviewMouseMove += AdornerOnMouseMove;
cropAdorner.PreviewMouseLeftButtonUp += AdornerOnMouseLeftButtonUp;
cropTool.Redraw(0, 0, 0, 0);
}
public CropService(FrameworkElement adornedElement, bool squareSelection)
{
//Hack: added by thr
_squareSelection = squareSelection;
_canvas = new Canvas
{
Height = adornedElement.ActualHeight,
Width = adornedElement.ActualWidth
};
_cropAdorner = new CropAdorner(adornedElement, _canvas);
var adornerLayer = AdornerLayer.GetAdornerLayer(adornedElement);
Debug.Assert(adornerLayer != null, nameof(adornerLayer) + " != null");
adornerLayer.Add(_cropAdorner);
var cropShape = new CropShape(
new Rectangle
{
Height = 0,
Width = 0,
Stroke = Brushes.Black,
StrokeThickness = 1.5
},
new Rectangle
{
Stroke = Brushes.White,
StrokeDashArray = new DoubleCollection(new double[] { 4, 4 })
}
);
_cropTool = new CropTool(_canvas, _squareSelection);
_createState = new CreateState(_cropTool, _canvas);
_completeState = new CompleteState();
_dragState = new DragState(_cropTool, _canvas);
_currentToolState = _completeState;
_cropAdorner.MouseLeftButtonDown += AdornerOnMouseLeftButtonDown;
_cropAdorner.MouseMove += AdornerOnMouseMove;
_cropAdorner.MouseLeftButtonUp += AdornerOnMouseLeftButtonUp;
_cropTool.Redraw(0, 0, 0, 0);
}
private static async Task CropImageWithShapeAsync(WriteableBitmap writeableBitmap, IRandomAccessStream stream, Rect croppedRect, BitmapFileFormat bitmapFileFormat, CropShape cropShape)
{
var device = CanvasDevice.GetSharedDevice();
var clipGeometry = CreateClipGeometry(device, cropShape, new Size(croppedRect.Width, croppedRect.Height));
if (clipGeometry == null)
{
return;
}
CanvasBitmap sourceBitmap = null;
using (var randomAccessStream = new InMemoryRandomAccessStream())
{
await CropImageAsync(writeableBitmap, randomAccessStream, croppedRect, bitmapFileFormat);
sourceBitmap = await CanvasBitmap.LoadAsync(device, randomAccessStream);
}
using (var offScreen = new CanvasRenderTarget(device, (float)croppedRect.Width, (float)croppedRect.Height, 96f))
{
using (var drawingSession = offScreen.CreateDrawingSession())
using (var markCommandList = new CanvasCommandList(device))
{
using (var markDrawingSession = markCommandList.CreateDrawingSession())
{
markDrawingSession.FillGeometry(clipGeometry, Colors.Black);
}
var alphaMaskEffect = new AlphaMaskEffect
{
Source = sourceBitmap,
AlphaMask = markCommandList
};
drawingSession.DrawImage(alphaMaskEffect);
alphaMaskEffect.Dispose();
}
clipGeometry.Dispose();
sourceBitmap.Dispose();
var pixelBytes = offScreen.GetPixelBytes();
var bitmapEncoder = await BitmapEncoder.CreateAsync(GetEncoderId(bitmapFileFormat), stream);
bitmapEncoder.SetPixelData(BitmapPixelFormat.Bgra8, BitmapAlphaMode.Premultiplied, offScreen.SizeInPixels.Width, offScreen.SizeInPixels.Height, 96.0, 96.0, pixelBytes);
await bitmapEncoder.FlushAsync();
}
}
private static CanvasGeometry CreateClipGeometry(ICanvasResourceCreator resourceCreator, CropShape cropShape, Size croppedSize)
{
switch (cropShape)
{
case CropShape.Rectangular:
break;
case CropShape.Circular:
var radiusX = croppedSize.Width / 2;
var radiusY = croppedSize.Height / 2;
var center = new Point(radiusX, radiusY);
return(CanvasGeometry.CreateEllipse(resourceCreator, center.ToVector2(), (float)radiusX, (float)radiusY));
}
return(null);
}
