public static TweenFunc<float> CubicBezier (float mx1, float my1, float mx2, float my2) {
var curve = new BezierCurveCubic(
new Vector2(0f, 0f),
new Vector2(1f, 1f),
new Vector2(mx1, my1),
new Vector2(mx2, my2)
);
return (from, to, t) => {
return from + (to - from) * curve.CalculatePoint(t).Y;
};
}
/// <summary>
/// Tessellates the path.
/// </summary>
/// <param name="path">The path.</param>
public void TessellatePath(PathGeometry path)
{
_vertexList.Clear();
_tesselator.EmptyCache();
_tesselator.BeginPolygon();
switch(path.FillRule)
{
case FillRule.EvenOdd:
_tesselator.WindingRule = Tesselator.Tesselator.WindingRuleType.Odd;
break;
case FillRule.Nonzero:
_tesselator.WindingRule = Tesselator.Tesselator.WindingRuleType.NonZero;
break;
default:
throw new ArgumentOutOfRangeException();
}
foreach (var figure in path.Figures)
{
_tesselator.BeginContour();
foreach (var seg in figure.Segments)
{
if (seg is PolyLineSegment)
{
var polyline = seg as PolyLineSegment;
polyline.Points.ForEach(AddPoint);
}
else if (seg is LineSegment)
{
AddPoint((seg as LineSegment).Point);
}
else if (seg is PolyBezierSegment)
{
var polybezier = (PolyBezierSegment) seg;
var bezierCurve = new BezierCurve(polybezier.Points.Select(p => new Vector2((float) p.X, (float) p.Y)));
Enumerable
.Range(1, 10)
.Select(i => bezierCurve.CalculatePoint(1.0f/i))
.ForEach(p => AddPoint(new Point(p.X, p.Y)));
}
else if (seg is BezierSegment)
{
var polybezier = (BezierSegment)seg;
var bezierCurve = new BezierCurveCubic(
LastPoint(),
new Vector2((float) polybezier.Point3.X, (float) polybezier.Point3.Y),
new Vector2((float) polybezier.Point1.X, (float) polybezier.Point1.Y),
new Vector2((float) polybezier.Point2.X, (float) polybezier.Point2.Y)
);
Enumerable
.Range(1, 10)
.Select(i => bezierCurve.CalculatePoint(1.0f / i))
.ForEach(p => AddPoint(new Point(p.X, p.Y)));
}
else
{
throw new ApplicationException(string.Format("segment type {0} not supported.", seg));
}
}
_tesselator.EndContour();
}
_tesselator.EndPolygon();
}