/// <summary>
/// sets the inital angle if datacontext is a ContentControl and if the Canvas was found.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void RotateThumb_DragStarted(object sender, VectorEventArgs e)
{
_designerItem = DataContext as ContentControl;
if (_designerItem != null)
{
_canvas = TreeExtensions.TryFindParent <Canvas>(_designerItem);
if (_canvas != null)
{
_centerPoint = (Point)_designerItem.TranslatePoint(
new Point(_designerItem.Width * _designerItem.RenderTransformOrigin.Point.X,
_designerItem.Height * _designerItem.RenderTransformOrigin.Point.Y),
_canvas);
Point startPoint = VisualExtensions.
PointToClient(_canvas, new PixelPoint((int)e.Vector.X, (int)e.Vector.Y));
_startVector = startPoint - _centerPoint;
_rotateTransform = _designerItem.RenderTransform as RotateTransform;
if (_rotateTransform == null)
{
_designerItem.RenderTransform = new RotateTransform(0);
_initialAngle = 0;
}
else
{
_initialAngle = _rotateTransform.Angle;
}
}
}
}
/// <summary>
/// sets the Angle tot he rotate transform if not null
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void ResizeThumb_DragStarted(object sender, VectorEventArgs e)
{
_designerItem = DataContext as ContentControl;
if (_designerItem != null)
{
_canvas = TreeExtensions.TryFindParent <Canvas>(_designerItem);
if (_canvas != null)
{
_transformOrigin = _designerItem.RenderTransformOrigin;
_rotateTransform = _designerItem.RenderTransform as RotateTransform;
if (_rotateTransform != null)
{
_angle = _rotateTransform.Angle * Math.PI / 180.0;
}
else
{
_angle = 0.0d;
}
}
}
}
