247: Ellipse
248: NullMarkers
249:  rename IGenerator
250: ScanlineHitTest
251: refactor VectorClipper
252: DrawSample
253
255
256: SinglePath, VertexStorage

change namespace
258: VertexSourceAdapter

remove  IVertexSource interface from VertexSourceAdapter
259
268
269: remove ApplyTransform
271: Stroke

remove VertexSourceAdapter interface
275: StrokeGenerator ,IVertextGenerator
276: Stroke ctor
277: remove VertexSourceAdapter, IVertextGenerator
278: remove AddPath(IVertexSource vs)
279: update IVertexSource
280: refactor