//--------------------------------------------------------------------
public static void InvertPolygon(VertexStore myvxs, int start)
{
// Skip all non-vertices at the beginning
int vcount = myvxs.Count;
while (start < vcount &&
!VertexHelper.IsVertextCommand(myvxs.GetCommand(start)))
{
++start;
}
// Skip all insignificant move_to
while (start + 1 < vcount &&
VertexHelper.IsMoveTo(myvxs.GetCommand(start)) &&
VertexHelper.IsMoveTo(myvxs.GetCommand(start + 1)))
{
++start;
}
// Find the last vertex
int end = start + 1;
while (end < vcount && !VertexHelper.IsNextPoly(myvxs.GetCommand(end)))
{
++end;
}
InvertPolygon(myvxs, start, end);
}
//----------------------------------------------------------------
// 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
//--------------------------------------------------------------------
static int ArrangePolygonOrientation(VertexStore myvxs, int start, bool clockwise)
{
//if (orientation == ShapePath.FlagsAndCommand.FlagNone) return start;
// Skip all non-vertices at the beginning
//ShapePath.FlagsAndCommand orientFlags = clockwise ? ShapePath.FlagsAndCommand.FlagCW : ShapePath.FlagsAndCommand.FlagCCW;
int vcount = myvxs.Count;
while (start < vcount &&
!VertexHelper.IsVertextCommand(myvxs.GetCommand(start)))
{
++start;
}
// Skip all insignificant move_to
while (start + 1 < vcount &&
VertexHelper.IsMoveTo(myvxs.GetCommand(start)) &&
VertexHelper.IsMoveTo(myvxs.GetCommand(start + 1)))
{
++start;
}
// Find the last vertex
int end = start + 1;
while (end < vcount && !VertexHelper.IsNextPoly(myvxs.GetCommand(end)))
{
++end;
}
if (end - start > 2)
{
bool isCW;
if ((isCW = IsCW(myvxs, start, end)) != clockwise)
{
// Invert polygon, set orientation flag, and skip all end_poly
InvertPolygon(myvxs, start, end);
VertexCmd flags;
int myvxs_count = myvxs.Count;
var orientFlags = isCW ? (int)EndVertexOrientation.CW : (int)EndVertexOrientation.CCW;
while (end < myvxs_count &&
VertexHelper.IsEndFigure(flags = myvxs.GetCommand(end)))
{
myvxs.ReplaceVertex(end++, orientFlags, 0);
//myvxs.ReplaceCommand(end++, flags | orientFlags);// Path.set_orientation(cmd, orientation));
}
}
}
return(end);
}
static void InvertPolygon(VertexStore myvxs, int start, int end)
{
int i;
VertexCmd tmp_PathAndFlags = myvxs.GetCommand(start);
--end; // Make "end" inclusive
// Shift all commands to one position
for (i = start; i < end; i++)
{
myvxs.ReplaceCommand(i, myvxs.GetCommand(i + 1));
}
// Assign starting command to the ending command
myvxs.ReplaceCommand(end, tmp_PathAndFlags);
// Reverse the polygon
while (end > start)
{
myvxs.SwapVertices(start++, end--);
}
}
static int ArrangeOrientations(VertexStore myvxs, int start, bool closewise)
{
while (start < myvxs.Count)
{
start = ArrangePolygonOrientation(myvxs, start, closewise);
if (VertexHelper.IsEmpty(myvxs.GetCommand(start)))
{
++start;
break;
}
}
return(start);
}