void UpdateGeometry(CacheKey key)
{
int apexs = 5;
double OuterRadius = key.OuterRadius;
double InnerRadius = key.OuterRadius / 2.0;
if (cache.TryGetValue(key, out _path))
{
_key = key;
return;
}
PathFigure figure = new PathFigure();
PolyLineSegment segments = new PolyLineSegment();
double add = 2 * Math.PI / (apexs * 2);
double angle = add;
RotateTransform trans = new RotateTransform(-90.0, OuterRadius, 0.0);
TranslateTransform trans2 = new TranslateTransform(key.X, key.Y);
Point[] points = new Point[apexs * 2];
figure.StartPoint = trans2.Transform(trans.Transform(new Point(OuterRadius, 0)));
for (int i = 0; i < points.Length - 1; i++, angle += add)
{
Point p = (i % 2 == 0 ? new Point(InnerRadius * Math.Cos(angle), InnerRadius * Math.Sin(angle))
: new Point(OuterRadius * Math.Cos(angle), OuterRadius * Math.Sin(angle)));
segments.Points.Add(trans2.Transform(trans.Transform(p)));
}
figure.Segments.Add(segments);
figure.IsClosed = true;
_path = new PathGeometry(new PathFigure[] { figure });
segments.Freeze();
figure.Freeze();
_path.Freeze();
_key = key;
cache.Add(key, _path);
}
