public void ArrangeOrientationsAllPaths(Path.Flags orientation)
{
if (orientation != Path.Flags.None)
{
uint start = 0;
while (start < m_vertices.TotalVertices())
{
start = ArrangeOrientations(start, orientation);
}
}
}
public uint ArrangeOrientations(uint start, Path.Flags orientation)
{
if (orientation != Path.Flags.None)
{
while (start < m_vertices.TotalVertices())
{
start = ArrangePolygonOrientation(start, orientation);
if (Path.IsStop(m_vertices.Command(start)))
{
++start;
break;
}
}
}
return(start);
}
// Arrange the orientation of a polygon, all polygons in a path,
// or in all paths. After calling arrange_orientations() or
// arrange_orientations_all_paths(), all the polygons will have
// the same orientation, i.e. path_flags_cw or path_flags_ccw
//--------------------------------------------------------------------
public uint ArrangePolygonOrientation(uint start, Path.Flags orientation)
{
if (orientation == Path.Flags.None)
{
return(start);
}
// Skip all non-vertices at the beginning
while (start < m_vertices.TotalVertices() &&
!Path.IsVertex(m_vertices.Command(start)))
{
++start;
}
// Skip all insignificant move_to
while (start + 1 < m_vertices.TotalVertices() &&
Path.IsMoveTo(m_vertices.Command(start)) &&
Path.IsMoveTo(m_vertices.Command(start + 1)))
{
++start;
}
// Find the last vertex
uint end = start + 1;
while (end < m_vertices.TotalVertices() &&
!Path.IsNextPoly(m_vertices.Command(end)))
{
++end;
}
if (end - start > 2)
{
if (PerceivePolygonOrientation(start, end) != orientation)
{
// Invert polygon, set orientation flag, and skip all end_poly
InvertPolygon(start, end);
uint PathAndFlags;
while (end < m_vertices.TotalVertices() &&
Path.IsEndPoly(PathAndFlags = m_vertices.Command(end)))
{
m_vertices.ModifyCommand(end++, PathAndFlags | (uint)orientation);// Path.set_orientation(cmd, orientation));
}
}
}
return(end);
}
