private void ResizeThumb_DragStarted(object sender, DragStartedEventArgs e)
{
_imageControl = DataContext as ImageControl;
if (_imageControl == null)
{
return;
}
_isResize = false;
_isLockAspect = _imageControl.IsLockAspect;
_oldWitdh = _imageControl.Width;
_oldHeight = _imageControl.Height;
_scaleTransform = _imageControl.GetTransform <ScaleTransform>();
_oldScaleX = _scaleTransform.ScaleX;
_oldScaleY = _scaleTransform.ScaleY;
if (VerticalAlignment == VerticalAlignment.Top && HorizontalAlignment == HorizontalAlignment.Stretch)
{
_thumbFlag = ThumbFlag.TopCenter;
}
else if (VerticalAlignment == VerticalAlignment.Stretch && HorizontalAlignment == HorizontalAlignment.Left)
{
_thumbFlag = ThumbFlag.LeftCenter;
}
else if (VerticalAlignment == VerticalAlignment.Stretch && HorizontalAlignment == HorizontalAlignment.Right)
{
_thumbFlag = ThumbFlag.RightCenter;
}
else if (VerticalAlignment == VerticalAlignment.Bottom && HorizontalAlignment == HorizontalAlignment.Stretch)
{
_thumbFlag = ThumbFlag.BottomCenter;
}
else if (VerticalAlignment == VerticalAlignment.Top && HorizontalAlignment == HorizontalAlignment.Left)
{
_thumbFlag = ThumbFlag.TopLeft;
}
else if (VerticalAlignment == VerticalAlignment.Top && HorizontalAlignment == HorizontalAlignment.Right)
{
_thumbFlag = ThumbFlag.TopRight;
}
else if (VerticalAlignment == VerticalAlignment.Bottom && HorizontalAlignment == HorizontalAlignment.Left)
{
_thumbFlag = ThumbFlag.BottomLeft;
}
else if (VerticalAlignment == VerticalAlignment.Bottom && HorizontalAlignment == HorizontalAlignment.Right)
{
_thumbFlag = ThumbFlag.BottomRight;
}
}
public DragResizeAction(FrameworkElement element, double scaleHorizontal, double scaleVertical, bool turnHorizontal, bool turnVerticale, ThumbFlag thumbFlag)
{
_element = element;
_translateTransform = element.GetTransform <TranslateTransform>();
_scaleTransform = element.GetTransform <ScaleTransform>();
_oldWitdh = _width = element.Width;
_oldHeight = _height = element.Height;
_oldTranslateX = _translateX = _translateTransform.X;
_oldTranslateY = _translateY = _translateTransform.Y;
_oldScaleX = _scaleX = _scaleTransform.ScaleX;
_oldScaleY = _scaleY = _scaleTransform.ScaleY;
var radian = element.GetTransform <RotateTransform>().Angle *Math.PI / 180;
var deltaVertical = _height * (1 - scaleVertical);
var deltaHorizontal = _width * (1 - scaleHorizontal);
if (thumbFlag == ThumbFlag.TopLeft || thumbFlag == ThumbFlag.TopCenter || thumbFlag == ThumbFlag.TopRight)
{
_translateY += deltaVertical * Math.Cos(-radian) * _scaleY;
_translateX += deltaVertical * Math.Sin(-radian) * _scaleY;
}
_height = _height * scaleVertical;
if (thumbFlag == ThumbFlag.TopLeft || thumbFlag == ThumbFlag.LeftCenter || thumbFlag == ThumbFlag.BottomLeft)
{
_translateY += deltaHorizontal * Math.Sin(radian) * _scaleX;
_translateX += deltaHorizontal * Math.Cos(radian) * _scaleX;
}
_width = _width * scaleHorizontal;
if (turnVerticale)
{
_scaleY = -_scaleY;
if (thumbFlag == ThumbFlag.TopLeft || thumbFlag == ThumbFlag.TopCenter || thumbFlag == ThumbFlag.TopRight)
{
_translateY -= 2 * _height * Math.Cos(-radian) * _scaleY;
_translateX -= 2 * _height * Math.Sin(-radian) * _scaleY;
}
}
if (turnHorizontal)
{
_scaleX = -_scaleX;
if (thumbFlag == ThumbFlag.TopLeft || thumbFlag == ThumbFlag.LeftCenter || thumbFlag == ThumbFlag.BottomLeft)
{
_translateY -= 2 * _width * Math.Sin(radian) * _scaleX;
_translateX -= 2 * _width * Math.Cos(radian) * _scaleX;
}
}
}
