public Clipper()
{
m_Scanbeam = null;
m_ActiveEdges = null;
m_SortedEdges = null;
m_IntersectNodes = null;
m_ExecuteLocked = false;
m_PolyOuts = new List<OutRec>();
m_Joins = new List<JoinRec>();
m_HorizJoins = new List<HorzJoinRec>();
m_ReverseOutput = false;
}
//------------------------------------------------------------------------------
private void DisposeIntersectNodes()
{
while ( m_IntersectNodes != null )
{
IntersectNode iNode = m_IntersectNodes.next;
m_IntersectNodes = null;
m_IntersectNodes = iNode;
}
}
//------------------------------------------------------------------------------
private void SwapIntersectNodes(IntersectNode int1, IntersectNode int2)
{
TEdge e1 = int1.edge1;
TEdge e2 = int1.edge2;
IntPoint p = int1.pt;
int1.edge1 = int2.edge1;
int1.edge2 = int2.edge2;
int1.pt = int2.pt;
int2.edge1 = e1;
int2.edge2 = e2;
int2.pt = p;
}
//------------------------------------------------------------------------------
private bool Process1Before2(IntersectNode node1, IntersectNode node2)
{
bool result;
if (node1.pt.Y == node2.pt.Y)
{
if (node1.edge1 == node2.edge1 || node1.edge2 == node2.edge1)
{
result = node2.pt.X > node1.pt.X;
return node2.edge1.dx > 0 ? !result : result;
}
else if (node1.edge1 == node2.edge2 || node1.edge2 == node2.edge2)
{
result = node2.pt.X > node1.pt.X;
return node2.edge2.dx > 0 ? !result : result;
}
else return node2.pt.X > node1.pt.X;
}
else return node1.pt.Y > node2.pt.Y;
}
//------------------------------------------------------------------------------
private void AddIntersectNode(TEdge e1, TEdge e2, IntPoint pt)
{
IntersectNode newNode = new IntersectNode();
newNode.edge1 = e1;
newNode.edge2 = e2;
newNode.pt = pt;
newNode.next = null;
if (m_IntersectNodes == null) m_IntersectNodes = newNode;
else if( Process1Before2(newNode, m_IntersectNodes) )
{
newNode.next = m_IntersectNodes;
m_IntersectNodes = newNode;
}
else
{
IntersectNode iNode = m_IntersectNodes;
while( iNode.next != null && Process1Before2(iNode.next, newNode) )
iNode = iNode.next;
newNode.next = iNode.next;
iNode.next = newNode;
}
}
//------------------------------------------------------------------------------
private void ProcessIntersectList()
{
while( m_IntersectNodes != null )
{
IntersectNode iNode = m_IntersectNodes.next;
{
IntersectEdges( m_IntersectNodes.edge1 ,
m_IntersectNodes.edge2 , m_IntersectNodes.pt, Protects.ipBoth );
SwapPositionsInAEL( m_IntersectNodes.edge1 , m_IntersectNodes.edge2 );
}
m_IntersectNodes = null;
m_IntersectNodes = iNode;
}
}