private void ApplyParameters(PageParameters parameters)
        {
            pageReflection.Opacity = parameters.Page0ShadowOpacity;

            rectangleRotate.Angle   = parameters.Page1RotateAngle;
            rectangleRotate.CenterX = parameters.Page1RotateCenterX;
            rectangleRotate.CenterY = parameters.Page1RotateCenterY;
            rectangleTranslate.X    = parameters.Page1TranslateX;
            rectangleTranslate.Y    = parameters.Page1TranslateY;
            clippingFigure.Figures.Clear();
            clippingFigure.Figures.Add(parameters.Page1ClippingFigure);

            RectangleGeometry rg = (RectangleGeometry)clippingPage0.Geometry1;

            rg.Rect = new Rect(parameters.RenderSize);
            PathGeometry pg = (PathGeometry)clippingPage0.Geometry2;

            pg.Figures.Clear();
            pg.Figures.Add(parameters.Page2ClippingFigure);

            pageReflection.StartPoint = parameters.Page1ReflectionStartPoint;
            pageReflection.EndPoint   = parameters.Page1ReflectionEndPoint;

            pageShadow.StartPoint = parameters.Page0ShadowStartPoint;
            pageShadow.EndPoint   = parameters.Page0ShadowEndPoint;
        }
        private static PageParameters ResetPage(UIElement source, CornerOrigin origin)
        {
            PageParameters _parameters = new PageParameters(source.RenderSize);

            _parameters.Page0ShadowOpacity        = 0;
            _parameters.Page1ClippingFigure       = new PathFigure();
            _parameters.Page1ReflectionStartPoint = new Point(0, 0);
            _parameters.Page1ReflectionEndPoint   = new Point(0, 0);
            _parameters.Page1RotateAngle          = 0;
            _parameters.Page1RotateCenterX        = 0;
            _parameters.Page1RotateCenterY        = 0;
            _parameters.Page1TranslateX           = 0;
            _parameters.Page1TranslateY           = 0;
            _parameters.Page2ClippingFigure       = new PathFigure();
            _parameters.Page0ShadowStartPoint     = new Point(0, 0);
            _parameters.Page0ShadowEndPoint       = new Point(0, 0);

            return(_parameters);
        }
        private static PageParameters?ComputePage(UIElement source, Point p, CornerOrigin origin)
        {
            CheckParams(ref source, ref p, origin);

            PageParameters _parameters = new PageParameters(source.RenderSize);

            double ratio = ComputeProgressRatio(source, p, origin);

            if (ratio > 1.5)
            {
                ratio = (2 - ratio) / 0.5;
            }
            else
            {
                ratio = 1;
            }
            _parameters.Page0ShadowOpacity = ratio;

            double xc = source.RenderSize.Width;
            double yc = source.RenderSize.Height;

            switch (origin)
            {
            case CornerOrigin.TopLeft:
                p.X = xc - p.X;
                p.Y = yc - p.Y;
                break;

            case CornerOrigin.TopRight:
                p.Y = yc - p.Y;
                break;

            case CornerOrigin.BottomLeft:
                p.X = xc - p.X;
                break;
            }

            if (p.X >= xc)
            {
                return(null);
            }

            // x = a * y + b
            double a = -(p.Y - yc) / (p.X - xc);
            double b = (xc + p.X) / 2 - a * ((yc + p.Y) / 2);

            double h1 = (xc - b) / a;
            double l1 = a * yc + b;

            double angle = (Math.Atan((xc - p.X) / (h1 - p.Y))) * 180 / Math.PI;

            if ((a < 0) && (p.Y < h1))
            {
                angle = angle - 180;
            }

            switch (origin)
            {
            case CornerOrigin.BottomRight:
                _parameters.Page1RotateAngle   = -angle;
                _parameters.Page1RotateCenterX = p.X;
                _parameters.Page1RotateCenterY = p.Y;
                _parameters.Page1TranslateX    = p.X;
                _parameters.Page1TranslateY    = p.Y - yc;
                break;

            case CornerOrigin.TopLeft:
                _parameters.Page1RotateAngle   = -angle;
                _parameters.Page1RotateCenterX = xc - p.X;
                _parameters.Page1RotateCenterY = yc - p.Y;
                _parameters.Page1TranslateX    = -p.X;
                _parameters.Page1TranslateY    = yc - p.Y;
                break;

            case CornerOrigin.TopRight:
                _parameters.Page1RotateAngle   = angle;
                _parameters.Page1RotateCenterX = p.X;
                _parameters.Page1RotateCenterY = yc - p.Y;
                _parameters.Page1TranslateX    = p.X;
                _parameters.Page1TranslateY    = yc - p.Y;
                break;

            case CornerOrigin.BottomLeft:
                _parameters.Page1RotateAngle   = angle;
                _parameters.Page1RotateCenterX = xc - p.X;
                _parameters.Page1RotateCenterY = p.Y;
                _parameters.Page1TranslateX    = -p.X;
                _parameters.Page1TranslateY    = p.Y - yc;
                break;
            }

            switch (origin)
            {
            case CornerOrigin.BottomRight:
                if (angle < 0)
                {
                    _parameters.Page1ClippingFigure.StartPoint = new Point(0, yc);
                    _parameters.Page1ClippingFigure.Segments.Clear();
                    _parameters.Page1ClippingFigure.Segments.Add(new LineSegment(new Point(xc - l1, yc), false));
                    _parameters.Page1ClippingFigure.Segments.Add(new LineSegment(new Point(0, h1), false));
                }
                else
                {
                    _parameters.Page1ClippingFigure.StartPoint = new Point(0, 0);
                    _parameters.Page1ClippingFigure.Segments.Clear();
                    _parameters.Page1ClippingFigure.Segments.Add(new LineSegment(new Point(xc - b, 0), false));
                    _parameters.Page1ClippingFigure.Segments.Add(new LineSegment(new Point(0, h1), false));
                }
                break;

            case CornerOrigin.TopLeft:
                if (angle < 0)
                {
                    _parameters.Page1ClippingFigure.StartPoint = new Point(xc, 0);
                    _parameters.Page1ClippingFigure.Segments.Clear();
                    _parameters.Page1ClippingFigure.Segments.Add(new LineSegment(new Point(l1, 0), false));
                    _parameters.Page1ClippingFigure.Segments.Add(new LineSegment(new Point(xc, yc - h1), false));
                }
                else
                {
                    _parameters.Page1ClippingFigure.StartPoint = new Point(xc, yc);
                    _parameters.Page1ClippingFigure.Segments.Clear();
                    _parameters.Page1ClippingFigure.Segments.Add(new LineSegment(new Point(b, yc), false));
                    _parameters.Page1ClippingFigure.Segments.Add(new LineSegment(new Point(xc, yc - h1), false));
                }
                break;

            case CornerOrigin.BottomLeft:
                if (angle < 0)
                {
                    _parameters.Page1ClippingFigure.StartPoint = new Point(xc, yc);
                    _parameters.Page1ClippingFigure.Segments.Clear();
                    _parameters.Page1ClippingFigure.Segments.Add(new LineSegment(new Point(l1, yc), false));
                    _parameters.Page1ClippingFigure.Segments.Add(new LineSegment(new Point(xc, h1), false));
                }
                else
                {
                    _parameters.Page1ClippingFigure.StartPoint = new Point(xc, 0);
                    _parameters.Page1ClippingFigure.Segments.Clear();
                    _parameters.Page1ClippingFigure.Segments.Add(new LineSegment(new Point(b, 0), false));
                    _parameters.Page1ClippingFigure.Segments.Add(new LineSegment(new Point(xc, h1), false));
                }
                break;

            case CornerOrigin.TopRight:
                if (angle < 0)
                {
                    _parameters.Page1ClippingFigure.StartPoint = new Point(0, 0);
                    _parameters.Page1ClippingFigure.Segments.Clear();
                    _parameters.Page1ClippingFigure.Segments.Add(new LineSegment(new Point(xc - l1, 0), false));
                    _parameters.Page1ClippingFigure.Segments.Add(new LineSegment(new Point(0, yc - h1), false));
                }
                else
                {
                    _parameters.Page1ClippingFigure.StartPoint = new Point(0, yc);
                    _parameters.Page1ClippingFigure.Segments.Clear();
                    _parameters.Page1ClippingFigure.Segments.Add(new LineSegment(new Point(xc - b, yc), false));
                    _parameters.Page1ClippingFigure.Segments.Add(new LineSegment(new Point(0, yc - h1), false));
                }
                break;
            }

            _parameters.Page2ClippingFigure.StartPoint = new Point(xc - _parameters.Page1ClippingFigure.StartPoint.X, _parameters.Page1ClippingFigure.StartPoint.Y);

            _parameters.Page2ClippingFigure.Segments = _parameters.Page1ClippingFigure.Segments.Clone();
            ((LineSegment)_parameters.Page2ClippingFigure.Segments[0]).Point
                = new Point(xc - ((LineSegment)_parameters.Page2ClippingFigure.Segments[0]).Point.X,
                            ((LineSegment)_parameters.Page2ClippingFigure.Segments[0]).Point.Y);
            ((LineSegment)_parameters.Page2ClippingFigure.Segments[1]).Point
                = new Point(xc - ((LineSegment)_parameters.Page2ClippingFigure.Segments[1]).Point.X,
                            ((LineSegment)_parameters.Page2ClippingFigure.Segments[1]).Point.Y);

            Point refletStartPoint;
            Point refletEndPoint;

            CornerOrigin oppositeOrigin = CornerOrigin.TopLeft;

            switch (origin)
            {
            case CornerOrigin.BottomLeft:
                oppositeOrigin = CornerOrigin.BottomRight;
                break;

            case CornerOrigin.BottomRight:
                oppositeOrigin = CornerOrigin.BottomLeft;
                break;

            case CornerOrigin.TopLeft:
                oppositeOrigin = CornerOrigin.TopRight;
                break;

            case CornerOrigin.TopRight:
                oppositeOrigin = CornerOrigin.TopLeft;
                break;
            }

            LinearGradientHelper.ComputePointsFromTop(xc, yc, xc - l1, yc - h1, 20, 20,
                                                      oppositeOrigin,
                                                      out refletStartPoint,
                                                      out refletEndPoint);

            _parameters.Page1ReflectionStartPoint = refletStartPoint;
            _parameters.Page1ReflectionEndPoint   = refletEndPoint; //new Point(1, 1 / Math.Tan((90 - angleClipping) * Math.PI / 180));

            Point startPoint;
            Point endPoint;

            double d = Math.Sqrt(Math.Pow(p.X - xc, 2) + Math.Pow(p.Y - yc, 2));

            double r1 = d / 10;
            double r2 = d / 10;

            LinearGradientHelper.ComputePoints(xc, yc, xc - l1, yc - h1, r1, r2,
                                               origin, out startPoint, out endPoint);

            _parameters.Page0ShadowStartPoint = startPoint;
            _parameters.Page0ShadowEndPoint   = endPoint;

            return(_parameters);
        }