// Vertex Source Interface
public void Rewind(int idx)
{
if (m_status == StrokeMath.status_e.initial)
{
m_src_vertices.close(m_closed != 0);
ShapePath.shorten_path(m_src_vertices, m_shorten, m_closed);
if (m_src_vertices.size() < 3)
{
m_closed = 0;
}
}
m_status = StrokeMath.status_e.ready;
m_src_vertex = 0;
m_out_vertex = 0;
}
// Vertex Source Interface
public void Rewind(int idx)
{
if (m_status == StrokeMath.status_e.initial)
{
m_src_vertices.close(true);
if (m_auto_detect)
{
if (!ShapePath.is_oriented(m_orientation))
{
m_orientation = (agg_math.calc_polygon_area(m_src_vertices) > 0.0) ?
ShapePath.FlagsAndCommand.FlagCCW :
ShapePath.FlagsAndCommand.FlagCW;
}
}
if (ShapePath.is_oriented(m_orientation))
{
m_stroker.width(ShapePath.is_ccw(m_orientation) ? m_width : -m_width);
}
}
m_status = StrokeMath.status_e.ready;
m_src_vertex = 0;
}
static public void shorten_path(VertexSequence vs, double s, int closed)
{
if (s > 0.0 && vs.size() > 1)
{
double d;
int n = (int)(vs.size() - 2);
while (n != 0)
{
d = vs[n].dist;
if (d > s) break;
vs.RemoveLast();
s -= d;
--n;
}
if (vs.size() < 2)
{
vs.remove_all();
}
else
{
n = (int)vs.size() - 1;
VertexDistance prev = vs[n - 1];
VertexDistance last = vs[n];
d = (prev.dist - s) / prev.dist;
double x = prev.x + (last.x - prev.x) * d;
double y = prev.y + (last.y - prev.y) * d;
last.x = x;
last.y = y;
if (!prev.IsEqual(last)) vs.RemoveLast();
vs.close(closed != 0);
}
}
}