/// <summary>
/// Private helper that takes an element and transforms it's 4 points
/// into the InkCanvas's space
/// </summary>
private static ElementCornerPoints GetTransformedElementCornerPoints(InkCanvasInnerCanvas canvas, UIElement childElement)
{
Debug.Assert(canvas != null);
Debug.Assert(childElement != null);
Debug.Assert(canvas.CheckAccess());
ElementCornerPoints elementPoints = new ElementCornerPoints();
elementPoints.Set = false;
if (childElement.Visibility != Visibility.Visible)
{
//
// this little one's not worth it...
//
return(elementPoints);
}
//
// get the transform from us to our parent InkCavas
//
GeneralTransform parentTransform = childElement.TransformToAncestor(canvas);
//
parentTransform.TryTransform(new Point(0, 0), out elementPoints.UpperLeft);
parentTransform.TryTransform(new Point(childElement.RenderSize.Width, 0), out elementPoints.UpperRight);
parentTransform.TryTransform(new Point(0, childElement.RenderSize.Height), out elementPoints.LowerLeft);
parentTransform.TryTransform(new Point(childElement.RenderSize.Width, childElement.RenderSize.Height), out elementPoints.LowerRight);
elementPoints.Set = true;
return(elementPoints);
}
/// <summary>
/// Private helper that takes an element and transforms it's 4 points
/// into the InkCanvas's space
/// </summary>
private static ElementCornerPoints GetTransformedElementCornerPoints(InkCanvasInnerCanvas canvas, UIElement childElement)
{
Debug.Assert(canvas != null);
Debug.Assert(childElement != null);
Debug.Assert(canvas.CheckAccess());
ElementCornerPoints elementPoints = new ElementCornerPoints();
elementPoints.Set = false;
if (childElement.Visibility != Visibility.Visible)
{
//
// this little one's not worth it...
//
return(elementPoints);
}
//
// get the transform from us to our parent InkCavas
//
GeneralTransform parentTransform = childElement.TransformToAncestor(canvas);
// REVIEW: any of the methods below may not actually perform the transformation
// Do we need to do anything special in that scenario?
parentTransform.TryTransform(new Point(0, 0), out elementPoints.UpperLeft);
parentTransform.TryTransform(new Point(childElement.RenderSize.Width, 0), out elementPoints.UpperRight);
parentTransform.TryTransform(new Point(0, childElement.RenderSize.Height), out elementPoints.LowerLeft);
parentTransform.TryTransform(new Point(childElement.RenderSize.Width, childElement.RenderSize.Height), out elementPoints.LowerRight);
elementPoints.Set = true;
return(elementPoints);
}