Function SplitSector

roomedit/source/objects.cpp:2201–2310

*/

void SplitSector (SHORT vertex1, SHORT vertex2)
{
   SelPtr llist;
   SHORT    curv, s, l, sd;
   char   msg1[ 80], msg2[ 80];

   /* check if there is a Sector between the two Vertices (in the middle) */
   s = GetCurObject( OBJ_SECTORS, Vertexes[ vertex1].x, Vertexes[ vertex1].y, Vertexes[ vertex2].x, Vertexes[ vertex2].y);
   if (s < 0)
   {
	  Beep();
	  Notify ("There is no Sector between Vertex #%d and Vertex #%d", vertex1, vertex2);
	  return;
   }
   /* check if there is a closed path from vertex1 to vertex2, along the edge of the Sector s */
   // ObjectsNeeded( OBJ_LINEDEFS, OBJ_SIDEDEFS, 0);
   llist = NULL;
   curv = vertex1;
   while (curv != vertex2)
   {
	  for (l = 0; l < NumLineDefs; l++)
	  {
	 sd = LineDefs[ l].sidedef1;
	 if (sd >= 0 && SideDefs[ sd].sector == s && LineDefs[ l].start == curv)
	 {
		curv = LineDefs[ l].end;
		SelectObject( &llist, l);
		break;
	 }
	 sd = LineDefs[ l].sidedef2;
	 if (sd >= 0 && SideDefs[ sd].sector == s && LineDefs[ l].end == curv)
	 {
		curv = LineDefs[ l].start;
		SelectObject( &llist, l);
		break;
	 }
	  }
	  if (l >= NumLineDefs)
	  {
	 Beep();
	 wsprintf( msg1, "Cannot find a closed path from Vertex #%d to Vertex #%d", vertex1, vertex2);
	 if (curv == vertex1)
		wsprintf( msg2, "There is no SideDef starting from Vertex #%d on Sector #%d", vertex1, s);
	 else
		wsprintf( msg2, "Check if Sector #%d is closed (cannot go past Vertex #%d)", s, curv);
	 Notify("%s.\n %s", msg1, msg2);
	 ForgetSelection( &llist);
	 return;
	  }
	  if (curv == vertex1)
	  {
	 Beep();
	 Notify("Vertex #%d is not on the same Sector (#%d) as Vertex #%d",
			vertex2, s, vertex1);
	 ForgetSelection( &llist);
	 return;
	  }
   }