private void BuildDistortion(GraphicsPath source)
{
_sourceBounds = source.GetBounds();
_distortionPath = new GraphicsPath(source.FillMode);
_lowerLeft = new PointF(_sourceBounds.Left, _sourceBounds.Bottom);
_lowerRight = new PointF(_sourceBounds.Right, _sourceBounds.Bottom);
_upperLeft = new PointF(_sourceBounds.Left, _sourceBounds.Top);
_upperRight = new PointF(_sourceBounds.Right, _sourceBounds.Top);
_distortionPath.AddLine(_lowerLeft, _upperLeft);
_distortionPath.AddBezier(_upperLeft,
new PointF(_sourceBounds.Left, _sourceBounds.Top + ((_sourceBounds.Height * (float)Intensity)) * -1),
new PointF(_sourceBounds.Right, _sourceBounds.Top + ((_sourceBounds.Height * (float)Intensity)) * -1),
_upperRight);
_distortionPath.AddLine(_upperRight, _lowerRight);
_distortionPath.AddBezier(_lowerRight,
new PointF(_sourceBounds.Right, _sourceBounds.Bottom + (_sourceBounds.Height * (float)Intensity)),
new PointF(_sourceBounds.Left, _sourceBounds.Bottom + (_sourceBounds.Height * (float)Intensity)),
_lowerLeft);
_distortionPath.Flatten();
_distortionPoints = ClipperUtility.ConvertToClipperPolygons(_distortionPath);
_distortionBounds = _distortionPath.GetBounds();
}
private void GetBoundedPoints(out PointF upperBoundPoint, out PointF lowerBoundPoint, PointF source)
{
if (_boundCache.ContainsKey(source.X))
{
upperBoundPoint = _boundCache[source.X][0];
lowerBoundPoint = _boundCache[source.X][1];
return;
}
var Path = new GraphicsPath();
var UpperX = source.X * (_sourceBounds.Width / (_upperRight.X - _upperLeft.X));
var LowerX = source.X * (_sourceBounds.Width / (_lowerRight.X - _lowerLeft.X));
Path.AddPolygon(new PointF[] {
new PointF(_distortionBounds.Left, _distortionBounds.Bottom),
new PointF(_distortionBounds.Left, _distortionBounds.Top),
new PointF(UpperX, _distortionBounds.Top),
new PointF(LowerX, _distortionBounds.Bottom),
});
Path.CloseFigure();
var ClippingPath = ClipperUtility.ConvertToClipperPolygons(Path);
Path.Dispose();
var ClippedPath = ClipperUtility.Clip(ClippingPath, _distortionPoints);
if (Math.Abs(source.X - _sourceBounds.Left) < .1 || Math.Abs(source.X - _sourceBounds.Right) < .1)
{
upperBoundPoint = new PointF(_sourceBounds.Left, _sourceBounds.Top);
lowerBoundPoint = new PointF(_sourceBounds.Left, _sourceBounds.Bottom);
}
else
{
var Points = ClippedPath.PathPoints;
var QuickBounded = Points.Where(p => Math.Abs(p.X - LowerX) < .01);
if (QuickBounded.Any())
{
upperBoundPoint = Points.Where(p => Math.Abs(p.X - LowerX) < .01).OrderBy(p => p.Y).First();
lowerBoundPoint = Points.Where(p => Math.Abs(p.X - LowerX) < .01).OrderByDescending(p => p.Y).First();
_boundCache.Add(source.X, new PointF[] { upperBoundPoint, lowerBoundPoint });
}
else
{
var RightMostPoints = Points.OrderByDescending(p => p.X).Take(2).ToList();
upperBoundPoint = RightMostPoints.OrderBy(p => p.Y).First();
lowerBoundPoint = RightMostPoints.OrderByDescending(p => p.Y).First();
}
ClippedPath.Dispose();
}
}