public static SoftwareBitmap GetCropedSoftwareBitmap(this InkCanvas canvas, IEnumerable <InkStroke> strokes = null, float newWidth = 0, float newHeight = 0, bool keepRelativeSize = false)
{
strokes = strokes ?? canvas.InkPresenter.StrokeContainer.GetStrokes();
var bounds = strokes.GetBoundingBoxForInkStrokes();
if (keepRelativeSize)
{
// copy strokes, resize them, but keep the stroke size the same, tranlsate to as close to 0, 0 as possible
List <InkStroke> newStrokes = new List <InkStroke>();
var scaleX = (float)(newWidth / bounds.Width);
var scaleY = (float)(newHeight / bounds.Height);
var translateX = 1 - (float)bounds.X * scaleX;
var translateY = 1 - (float)bounds.Y * scaleY;
foreach (var stroke in strokes)
{
var newStroke = stroke.Clone();
newStroke.PointTransform = Matrix3x2.CreateScale(scaleX, scaleY) * Matrix3x2.CreateTranslation(translateX, translateY);
newStroke.DrawingAttributes = GetDefaultInkDrawingAttributes();
newStrokes.Add(newStroke);
}
strokes = newStrokes;
bounds = strokes.GetBoundingBoxForInkStrokes();
}
bounds.X = Math.Max(bounds.X, 0);
bounds.Y = Math.Max(bounds.Y, 0);
var bitmap = canvas.GetSoftwareBitmap(strokes);
if (newWidth > 0 && newHeight > 0)
{
return(bitmap.CropAndResize(bounds, newWidth, newHeight));
}
return(bitmap.Crop(bounds));
}
