clearSnap drawPerpMark drawSnap getSnapOptions getSnappedHandle getSnappedPoint getSnappedPoint getSnappedType setIgnoreStartPoint setSnapOptions snapPoint snapPoint ~MgSnap

drawPerpMark() virtual bool MgSnap::drawPerpMark ( GiGraphics *  gs, const GiContext &  ctx, const Point2d &  a, const Point2d &  b, const Point2d &  perp, const Point2d &  c, float  len  ) const pure virtual 显示垂足标志(90度折线), perp为perp-c与a-b相交的垂足 在 MgCmdManagerImpl 内被实现. 这是这个函数的调用关系图: