VertexCmd GetNextVertex(out double x, out double y)
{
x = 0; y = 0;
VertexCmd cmd = VertexCmd.LineTo;
do
{
switch (m_status)
{
case Status.Init:
this.Rewind();
goto case Status.Ready;
case Status.Ready:
if (multipartVertexDistanceList.CurrentRangeLen < 2 + (m_closed ? 1 : 0))
{
cmd = VertexCmd.NoMore;
break;
}
m_status = m_closed ? Status.Outline1 : Status.Cap1;
cmd = VertexCmd.MoveTo;
m_src_vertex = 0;
m_out_vertex = 0;
break;
case Status.CloseFirst:
m_status = Status.Outline2;
cmd = VertexCmd.MoveTo;
goto case Status.Outline2;
case Status.Cap1:
{
Vertex2d v0, v1;
multipartVertexDistanceList.GetFirst2(out v0, out v1);
m_stroker.CreateCap(
m_out_vertices,
v0,
v1,
v0.CalLen(v1));
m_src_vertex = 1;
m_prev_status = Status.Outline1;
m_status = Status.OutVertices;
m_out_vertex = 0;
}
break;
case Status.Cap2:
{
Vertex2d beforeLast, last;
multipartVertexDistanceList.GetLast2(out beforeLast, out last);
m_stroker.CreateCap(m_out_vertices,
last,
beforeLast,
beforeLast.CalLen(last));
m_prev_status = Status.Outline2;
m_status = Status.OutVertices;
m_out_vertex = 0;
}
break;
case Status.Outline1:
{
if (m_closed)
{
if (m_src_vertex >= multipartVertexDistanceList.CurrentRangeLen)
{
m_prev_status = Status.CloseFirst;
m_status = Status.EndPoly1;
break;
}
}
else
{
if (m_src_vertex >= multipartVertexDistanceList.CurrentRangeLen - 1)
{
m_status = Status.Cap2;
break;
}
}
Vertex2d prev, cur, next;
multipartVertexDistanceList.GetTripleVertices(m_src_vertex,
out prev,
out cur,
out next);
//check if we should join or not ?
//don't join it
m_stroker.CreateJoin(m_out_vertices,
prev,
cur,
next,
prev.CalLen(cur),
cur.CalLen(next));
++m_src_vertex;
m_prev_status = m_status;
m_status = Status.OutVertices;
m_out_vertex = 0;
}
break;
case Status.Outline2:
{
if (m_src_vertex <= (!m_closed ? 1 : 0))
{
m_status = Status.EndPoly2;
m_prev_status = Status.Stop;
break;
}
--m_src_vertex;
Vertex2d prev, cur, next;
multipartVertexDistanceList.GetTripleVertices(m_src_vertex,
out prev,
out cur,
out next);
m_stroker.CreateJoin(m_out_vertices,
next,
cur,
prev,
cur.CalLen(next),
prev.CalLen(cur));
m_prev_status = m_status;
m_status = Status.OutVertices;
m_out_vertex = 0;
}
break;
case Status.OutVertices:
if (m_out_vertex >= m_out_vertices.Count)
{
m_status = m_prev_status;
}
else
{
m_out_vertices.GetVertex(m_out_vertex++, out x, out y);
return(cmd);
}
break;
case Status.EndPoly1:
m_status = m_prev_status;
x = (int)EndVertexOrientation.CCW;
y = 0;
return(VertexCmd.Close);
case Status.EndPoly2:
m_status = m_prev_status;
x = (int)EndVertexOrientation.CW;
y = 0;
return(VertexCmd.Close);
case Status.Stop:
cmd = VertexCmd.NoMore;
break;
}
} while (!VertexHelper.IsEmpty(cmd));
return(cmd);
}
