Initial import of (very old) vidoom sources.

1 files changed, 3812 insertions, 0 deletions

diff --git a/editline.c b/editline.c
new file mode 100644
index 0000000..69d61a3
--- /dev/null
+++ b/editline.c
@@ -0,0 +1,3812 @@
+/*
+
+    viDOOM - level editor for DOOM
+
+    Copyright (C) 2000  Ian Cowburn (ianc@noddybox.demon.co.uk)
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+    -------------------------------------------------------------------------
+
+    Editor LINEDEF definitions
+
+*/
+static const char rcs_id[]="$Id$";
+
+#include "config.h"
+#include "globals.h"
+
+#include <math.h>
+#include <ctype.h>
+
+#include "editvar.h"
+#include "sectors.h"
+#include "texture.h"
+#include "genlines.h"
+#include "specials.h"
+#include "flags.h"
+#include "util.h"
+
+
+/* ---------------------------------------- MACROS
+*/
+#define LinesCrossV(v1,v2,v3,v4)					\
+		LinesCross ((v1)->v.x,(v1)->v.y,(v2)->v.x,(v2)->v.y,	\
+			    (v3)->v.x,(v3)->v.y,(v4)->v.x,(v4)->v.y)
+
+#define SetPoint(pt,vt)	do {(pt).x=(vt)->v.x;(pt).y=(vt)->v.y;} while(0)
+
+#define SPLINE_THRESH	1
+
+/* This following define relies on the naming of parameters in DoCalcSpline()
+   and DoCalcLine()
+*/
+#define CHECKSTEP(X,Y)	do  {					\
+			    (*len)++;				\
+								\
+			    if (p)				\
+				if (((*len)%step)==0)		\
+				    {				\
+				    if ((*idx)<MAX_STEPS)	\
+					{			\
+					p[*idx].x=X;		\
+					p[*idx].y=Y;		\
+				    	(*idx)++;		\
+					}			\
+				    }				\
+			    } while(0)
+
+/* ---------------------------------------- STEP CREATION SHARED DATA
+*/
+#define MIN_STEPS	1
+#define MAX_STEPS	128
+
+struct	{
+	int		x;
+	int		y;
+
+	EditLine	*from;
+	EditLine	*to;
+	int		from_c;
+	int		to_c;
+	int		from_f;
+	int		to_f;
+
+	int		swap;
+	Point		vf[2];
+	Point		vt[2];
+
+	int		no;
+	double		step_f;
+	double		step_c;
+	int		circular;
+	int		side;
+
+	Point		p[2][MAX_STEPS+2];
+	} step;
+
+
+/* ---------------------------------------- PRIVATE UTILS
+*/
+static void DrawLinedef(EditLine *l, int col)
+{
+    double dx,dy;
+
+    VIDOOM_TRACE;
+
+    dx=((l->v[0]->v.x)-(l->v[1]->v.x))/2;
+    dy=((l->v[0]->v.y)-(l->v[1]->v.y))/2;
+
+    MapLineD(l,col);
+
+    MapLine((int)(l->v[0]->v.x-dx),(int)(l->v[0]->v.y-dy),
+	    (int)(l->v[0]->v.x-dx-dy/6),(int)(l->v[0]->v.y-dy+dx/6),col);
+}
+
+
+static int SelColour(int selmode)
+{
+    switch(selmode)
+    	{
+	case SELECT_OVER:
+	    return(OVERCOL);
+	    break;
+	case SELECT_SELECTED:
+	    return(SELCOL);
+	    break;
+	default:
+	    if (edit_mode==SECTOR_MODE)
+	    	return(SECTCOL);
+	    else
+		return(LINECOL);
+	    break;
+	}
+}
+
+
+static void RemoveHighlights(List l)
+{
+    Iterator i;
+    Object *o;
+    int *n;
+
+    i=ListIterator(l);
+
+    while(i)
+	{
+	n=IteratorData(i);
+
+	if ((o=MapElem(linedef,*n)))
+	    DrawLinedef(o->data,SelColour(o->select));
+
+	i=IteratorNext(i);
+	}
+}
+
+
+static void LineSelectionCentre(int *x,int *y)
+{
+    int *f;
+    EditLine *l;
+    Iterator i;
+    int min_x,min_y,max_x,max_y;
+
+    VIDOOM_TRACE;
+
+    i=ListIterator(selected);
+
+    min_x=99999;
+    min_y=99999;
+    max_x=-99999;
+    max_y=-99999;
+
+    while(i)
+	{
+	f=IteratorData(i);
+	l=GETLINE(*f);
+
+	min_x=MIN(l->min_x,min_x);
+	min_y=MIN(l->min_y,min_y);
+	max_x=MAX(l->max_x,max_x);
+	max_y=MAX(l->max_y,max_y);
+
+	i=IteratorNext(i);
+    }
+
+    *x=min_x+(max_x-min_x)/2;
+    *y=min_y+(max_y-min_y)/2;
+}
+
+
+static void DeleteLeftSidedef(EditLine *l)
+{
+    Object *o;
+    int n;
+    int del;
+    int side;
+    EditLine *cl;
+
+    VIDOOM_TRACE;
+
+    if (l->l.left==-1)
+    	return;
+
+    l->sl=NULL;
+    side=l->l.left;
+    l->l.left=-1;
+
+    /* Free up the sidedef if there is no other linedef
+       bound to it
+    */
+    del=TRUE;
+
+    for(n=0;(n<MapSize(linedef))&&(del);n++)
+	{
+	cl=GETLINE(n);
+
+	if ((cl)&&((cl->l.left==side)||(cl->l.right==side)))
+	    del=FALSE;
+	}
+
+    if (del)
+	{
+	o=MapElem(sidedef,side);
+	Release(o->data);
+	o->data=NULL;
+	}
+}
+
+
+static void DeleteRightSidedef(EditLine *l)
+{
+    Object *o;
+    int n;
+    int del;
+    int side;
+    EditLine *cl;
+
+    VIDOOM_TRACE;
+
+    if (l->l.right==-1)
+    	return;
+
+    l->sr=NULL;
+    side=l->l.right;
+    l->l.right=-1;
+
+    /* Free up the sidedef if there is no other linedef
+       bound to it
+    */
+    del=TRUE;
+
+    for(n=0;(n<MapSize(linedef))&&(del);n++)
+	{
+	cl=GETLINE(n);
+
+	if ((cl)&&((cl->l.left==side)||(cl->l.right==side)))
+	    del=FALSE;
+	}
+
+    if (del)
+	{
+	o=MapElem(sidedef,side);
+	Release(o->data);
+	o->data=NULL;
+	}
+}
+
+
+static void DeleteLinedef(int f)
+{
+    Object *o;
+    EditLine *l;
+
+    VIDOOM_TRACE;
+
+    o=MapElem(linedef,f);
+    l=o->data;
+    DeleteLeftSidedef(l);
+    DeleteRightSidedef(l);
+
+    IntListRm(l->v[0]->l,f);
+    IntListRm(l->v[1]->l,f);
+
+    Release(o->data);
+    o->data=NULL;
+    o->select=SELECT_NONE;
+}
+
+
+static int SplitLinedef(int f)
+{
+    Object o;
+    EditLine *l,*nl;
+    Sidedef *nsl,*nsr;
+    EditVert *nv;
+    int n_nl,dx,dy,tw;
+
+    VIDOOM_TRACE;
+
+    l=GETLINE(f);
+
+    o.select=SELECT_NONE;
+
+    /* Create copies of the original linedefs and sidedefs
+    */
+    nl=Grab(sizeof(EditLine));
+    memcpy(nl,l,sizeof(EditLine));
+    o.data=nl;
+    n_nl=MapSize(linedef);
+    nl->no=n_nl;
+    MapAdd(linedef,n_nl,&o);
+
+    nsr=Grab(sizeof(Sidedef));
+    memcpy(nsr,l->sr,sizeof(Sidedef));
+    o.data=nsr;
+    nl->l.right=MapSize(sidedef);
+    MapAdd(sidedef,nl->l.right,&o);
+    nl->sr=GETSIDE(nl->l.right);
+
+    if (l->l.left!=-1)
+	{
+	nsl=Grab(sizeof(Sidedef));
+	memcpy(nsl,l->sl,sizeof(Sidedef));
+	o.data=nsl;
+	nl->l.left=MapSize(sidedef);
+	MapAdd(sidedef,nl->l.left,&o);
+	nl->sl=GETSIDE(nl->l.left);
+	}
+    else
+    	nsl=NULL;
+
+    /* Work out the middle of the current line and create the vertex there
+    */
+    nv=Grab(sizeof(EditVert));
+    nv->l=ListNew(sizeof(int));
+
+    dx=((l->v[1]->v.x)-(l->v[0]->v.x))/2;
+    dy=((l->v[1]->v.y)-(l->v[0]->v.y))/2;
+
+    nv->v.x=l->v[0]->v.x+dx;
+    nv->v.y=l->v[0]->v.y+dy;
+    o.data=nv;
+
+    /* Update the vertex map, and the from/to in the old/new linedefs
+    */
+    nl->l.from=MapSize(vertex);
+    MapAdd(vertex,nl->l.from,&o);
+
+    l->l.to=nl->l.from;
+
+    l->v[1]=GETVERT(l->l.to);
+    nl->v[0]=GETVERT(nl->l.from);
+
+    /* Update the vertex lists
+    */
+    IntListRm(nl->v[1]->l,f);
+    IntListUniqAdd(nl->v[0]->l,f);
+    IntListUniqAdd(nl->v[0]->l,n_nl);
+
+    /* Align textures
+    */
+    tw=CalcTextureWidth(nsr->upper,nsr->middle,nsr->lower);
+
+    if (tw)
+	nsr->x=(l->sr->x+Len(l->v[0]->v.x,l->v[0]->v.y,
+					l->v[1]->v.x,l->v[1]->v.y))%tw;
+    else
+	nsr->x=0;
+
+    if (nsl)
+    	{
+	tw=CalcTextureWidth(nsl->upper,nsl->middle,nsl->lower);
+	if (tw)
+	    nsl->x=(l->sl->x+Len(l->v[0]->v.x,l->v[0]->v.y,
+					    l->v[1]->v.x,l->v[1]->v.y))%tw;
+	else
+	    nsl->x=0;
+	}
+
+    /* New linedef no
+    */
+    return(n_nl);
+}
+
+
+/* ---------------------------------------- STEP CREATION CODE CALCULATIONS
+*/
+static void DoCalcLine (int x0,int y0,int x1,int y1,
+			Point p[],int step,int *idx,int *len)
+{
+    int dx,dy,ix,iy,incre,incrne,d,x,y,ymode;
+    int p1x,p1y,p2x,p2y;
+
+    VIDOOM_TRACE;
+
+    p1x=x0;
+    p1y=y0;
+    p2x=x1;
+    p2y=y1;
+
+    dx=p2x-p1x;
+    dy=p2y-p1y;
+
+    ix=SGN(dx);
+    iy=SGN(dy);
+
+    dx=ABS(dx);
+    dy=ABS(dy);
+
+    if (dy>dx)
+	{
+	ymode=TRUE;
+	d=dx*2-dy;
+	incre=dx*2;
+	incrne=(dx-dy)*2;
+	}
+    else
+	{
+	ymode=FALSE;
+	d=dy*2-dx;
+	incre=dy*2;
+	incrne=(dy-dx)*2;
+	}
+
+    x=p1x;
+    y=p1y;
+
+    CHECKSTEP(x,y);
+
+    if (ymode)
+	while(y!=p2y)
+	    {
+	    if (d<=0)
+		{
+		d+=incre;
+		y+=iy;
+		}
+	    else
+		{
+		d+=incrne;
+		y+=iy;
+		x+=ix;
+		}
+
+	    CHECKSTEP(x,y);
+	    }
+    else
+	while(x!=p2x)
+	    {
+	    if (d<=0)
+		{
+		d+=incre;
+		x+=ix;
+		}
+	    else
+		{
+		d+=incrne;
+		y+=iy;
+		x+=ix;
+		}
+
+	    CHECKSTEP(x,y);
+	    }
+}
+
+
+static void DoCalcSpline (int x0,int y0,int x1,int y1,int x2,int y2,
+			  Point p[],int step,int *idx,int *len)
+{
+    int xa, ya, xb, yb, xc, yc, xp, yp;
+
+    VIDOOM_TRACE;
+
+    if ((x0==x1==x2)&&(y0==y1==y2))
+	{
+	CHECKSTEP(x0,y0);
+	return;
+	}
+
+    if ((x0==x1)&&(y0==y1))
+	{
+	if (p)
+	    DoCalcLine(x1,y1,x2,y2,p,step,idx,len);
+	else
+	    *len+=Len(x1,y1,x2,y2);
+	return;
+	}
+
+    if ((x0==x2)&&(y0==y2))
+	{
+	if (p)
+	    DoCalcLine(x0,y0,x1,y1,p,step,idx,len);
+	else
+	    *len+=Len(x0,y0,x1,y1);
+	return;
+	}
+
+    if ((x1==x2)&&(y1==y2))
+	{
+	if (p)
+	    DoCalcLine(x0,y0,x2,y2,p,step,idx,len);
+	else
+	    *len+=Len(x0,y0,x2,y2);
+	return;
+	}
+
+    xa = ( x0 + x1 ) / 2;
+    ya = ( y0 + y1 ) / 2;
+    xc = ( x1 + x2 ) / 2;
+    yc = ( y1 + y2 ) / 2;
+    xb = ( xa + xc ) / 2;
+    yb = ( ya + yc ) / 2;
+
+    xp = ( x0 + xb ) / 2;
+    yp = ( y0 + yb ) / 2;
+
+    if ( ABS( xa - xp ) + ABS( ya - yp ) > SPLINE_THRESH )
+        DoCalcSpline(x0,y0,xa,ya,xb,yb,p,step,idx,len);
+    else
+	if (p)
+	    DoCalcLine(x0,y0,xb,yb,p,step,idx,len);
+	else
+	    *len+=Len(x0,y0,xb,yb);
+
+    xp = ( x2 + xb ) / 2;
+    yp = ( y2 + yb ) / 2;
+    if ( ABS( xc - xp ) + ABS( yc - yp ) > SPLINE_THRESH )
+        DoCalcSpline(xb,yb,xc,yc,x2,y2,p,step,idx,len);
+    else
+	if (p)
+	    DoCalcLine(xb,yb,x2,y2,p,step,idx,len);
+	else
+	    *len+=Len(xb,yb,x2,y2);
+}
+
+
+static void Spline(int x0,int y0, int x1, int y1, int x2, int y2,
+		       Point p[],int step)
+{
+    int len;
+    int idx;
+
+    VIDOOM_TRACE;
+
+    len=0;
+    idx=0;
+    DoCalcSpline(x0,y0,x1,y1,x2,y2,p,step,&idx,&len);
+}
+
+
+static int SplineLen(int x0,int y0, int x1, int y1, int x2, int y2)
+{
+    int len;
+
+    VIDOOM_TRACE;
+
+    len=0;
+    DoCalcSpline(x0,y0,x1,y1,x2,y2,NULL,0,NULL,&len);
+    return (len);
+}
+
+
+static void CalcSteps(void)
+{
+    double dx,dy;
+    int f,r;
+    int len;
+
+    VIDOOM_TRACE;
+
+    step.step_f=((double)step.to_f-step.from_f)/(step.no+2);
+    step.step_c=((double)step.to_c-step.from_c)/(step.no+2);
+
+    if (step.circular)
+	{
+	f=step.side;
+
+	len=SplineLen(step.vf[f].x,step.vf[f].y,step.x,step.y,
+					step.vt[f].x,step.vt[f].y);
+
+	len=(int)((double)len/((double)step.no+1.0)+1.0);
+
+	if (len<1)
+	    len=1;
+
+	Spline(step.vf[f].x,step.vf[f].y,step.x,step.y,
+			    step.vt[f].x,step.vt[f].y,&step.p[f][1],len);
+
+	step.p[f][0].x=step.vf[f].x;
+	step.p[f][0].y=step.vf[f].y;
+
+	step.p[f][step.no+1].x=step.vt[f].x;
+	step.p[f][step.no+1].y=step.vt[f].y;
+	}
+    else
+	for(f=0;f<2;f++)
+	    {
+	    dx=(double)(step.vt[f].x-step.vf[f].x)/(step.no+1);
+	    dy=(double)(step.vt[f].y-step.vf[f].y)/(step.no+1);
+
+	    for(r=1;r<=step.no;r++)
+		{
+		step.p[f][r].x=(int)(step.vf[f].x+(dx*r));
+		step.p[f][r].y=(int)(step.vf[f].y+(dy*r));
+		}
+
+	    step.p[f][0].x=step.vf[f].x;
+	    step.p[f][0].y=step.vf[f].y;
+
+	    step.p[f][step.no+1].x=step.vt[f].x;
+	    step.p[f][step.no+1].y=step.vt[f].y;
+	    }
+}
+
+
+int SectorInBox(Point tl, Point br)
+{
+   int x,y;
+
+   x=tl.x+(br.x-tl.x)/2;
+   y=tl.y+(br.y-tl.y)/2;
+
+   return (SectorHoldingPoint(x,y));
+}
+
+
+/* ---------------------------------------- STEP CREATION CALLBACKS
+*/
+static void PickDraw(int *x, int *y)
+{
+    int f;
+
+    VIDOOM_TRACE;
+
+    step.x=*x;
+    step.y=*y;
+
+    if (step.circular)
+    	CalcSteps();
+
+    for(f=0;f<2;f++)
+	MapLine(step.p[f][0].x,step.p[f][0].y,
+		step.p[f][1].x,step.p[f][1].y,LINECOL);
+
+    for(f=1;f<=step.no;f++)
+	{
+	MapLine(step.p[0][f].x,step.p[0][f].y,
+		step.p[1][f].x,step.p[1][f].y,LINECOL);
+
+	MapLine(step.p[0][f].x,step.p[0][f].y,
+		step.p[0][f+1].x,step.p[0][f+1].y,LINECOL);
+
+	MapLine(step.p[1][f].x,step.p[1][f].y,
+		step.p[1][f+1].x,step.p[1][f+1].y,LINECOL);
+	}
+}
+
+
+static void PickKey(GFXKey k)
+{
+   VIDOOM_TRACE;
+
+   if (k.code==GFX_ASCII)
+   	switch(toupper(k.ascii))
+	    {
+	    case 'C':
+		step.circular=!step.circular;
+		CalcSteps();
+		break;
+
+	    case 'S':
+		step.side^=1;
+		CalcSteps();
+		break;
+
+	    case 'R':
+		step.swap=!step.swap;
+
+		if (!step.swap)
+		    {
+		    SetPoint(step.vf[0],step.from->v[0]);
+		    SetPoint(step.vf[1],step.from->v[1]);
+		    SetPoint(step.vt[0],step.to->v[0]);
+		    SetPoint(step.vt[1],step.to->v[1]);
+		    }
+		else
+		    {
+		    SetPoint(step.vf[0],step.from->v[0]);
+		    SetPoint(step.vf[1],step.from->v[1]);
+		    SetPoint(step.vt[0],step.to->v[1]);
+		    SetPoint(step.vt[1],step.to->v[0]);
+		    }
+
+		CalcSteps();
+
+		if (step.circular)
+		    {
+		    step.side^=1;
+		    CalcSteps();
+		    step.side^=1;
+		    }
+
+	    	break;
+
+	    case '+':
+		if (step.no<MAX_STEPS)
+		    {
+		    step.no++;
+		    CalcSteps();
+
+		    if (step.circular)
+		    	{
+			step.side^=1;
+			CalcSteps();
+			step.side^=1;
+			}
+		    }
+	    	break;
+
+	    case '-':
+		if (step.no>MIN_STEPS)
+		    {
+		    step.no--;
+		    CalcSteps();
+
+		    if (step.circular)
+		    	{
+			step.side^=1;
+			CalcSteps();
+			step.side^=1;
+			}
+		    }
+	    	break;
+	    }
+}
+
+
+static void PickInfo(char *p)
+{
+    VIDOOM_TRACE;
+
+    GuiDrawInfoBox(p,GUI_FLUSH_RIGHT,GUI_FLUSH_LOWER,FALSE,
+			"No       : %d|"
+			"Step (F) : %d|"
+			"Step (C) : %d|"
+			"Mode     : %-s|"
+			"Side     : %d",
+			    step.no,ABS((int)step.step_f),ABS((int)step.step_c),
+			    step.circular ? "Curve   " : "Straight",
+			    step.side);
+
+    GuiDrawInfoBox(p,GUI_FLUSH_LEFT,GUI_FLUSH_LOWER,FALSE,
+    			"+  - increase number of steps|"
+    			"-  - decrease number of steps|"
+    			"C  - change between straight/curve|"
+    			"S  - change wall being moved in curve mode|"
+			"R  - swap vertex matching|"
+			" |"
+			"Press left button to complete.  ESC to cancel");
+}
+
+
+/* ---------------------------------------- STEP CREATION CODE
+*/
+typedef struct
+	{
+	int	line;
+	int	apply;
+	} TextureMatch;
+
+static void ApplyTextureOffset(List li,int tw,int right)
+{
+    int off;
+    Iterator i;
+    TextureMatch *tm;
+    EditLine *l;
+    Sidedef *s;
+
+    VIDOOM_TRACE;
+
+    i=ListIterator(li);
+    off=0;
+
+    while(i)
+    	{
+	tm=IteratorData(i);
+
+	l=GETLINE(tm->line);
+
+	if (tm->apply)
+	    {
+	    if (right)
+	    	s=l->sr;
+	    else
+	    	s=l->sl;
+
+	    s->x=off;
+	    }
+
+	off=(off+Len(l->v[0]->v.x,l->v[0]->v.y,l->v[1]->v.x,l->v[1]->v.y))%tw;
+
+	i=IteratorNext(i);
+	}
+}
+
+
+static int CreateSteps(int i_from, int i_to)
+{
+    EditSect *s;
+    EditLine *from,*to;
+    DirName upper,lower,middle,floor,ceiling;
+    int s_flag;
+    int type;
+
+    VIDOOM_TRACE;
+
+    from=GETLINE(i_from);
+    to=GETLINE(i_to);
+
+    if ((Len(from->v[0]->v.x,from->v[0]->v.y,
+    		from->v[1]->v.x,from->v[1]->v.y)==0)||
+	(Len(to->v[0]->v.x,to->v[0]->v.y,to->v[1]->v.x,to->v[1]->v.y)==0))
+	{
+	GuiInfoBox("ERROR","Lines must be non-zero length");
+	return(FALSE);
+	}
+
+    if (((from->l.from==to->l.from)&&(to->l.to==to->l.to))||
+	((from->l.from==to->l.to)&&(to->l.to==to->l.from)))
+	{
+	GuiInfoBox("ERROR","Lines cannot share a vertex");
+	return(FALSE);
+	}
+
+    if (!(LinesCrossV(from->v[0],to->v[0],from->v[1],to->v[1])))
+   	{
+	step.swap=FALSE;
+	SetPoint(step.vf[0],from->v[0]);
+	SetPoint(step.vf[1],from->v[1]);
+	SetPoint(step.vt[0],to->v[0]);
+	SetPoint(step.vt[1],to->v[1]);
+	}
+    else
+   	{
+	step.swap=TRUE;
+	SetPoint(step.vf[0],from->v[0]);
+	SetPoint(step.vf[1],from->v[1]);
+	SetPoint(step.vt[0],to->v[1]);
+	SetPoint(step.vt[1],to->v[0]);
+	}
+
+    step.x=ms.x;
+    step.y=ms.y;
+    step.from=from;
+    step.to=to;
+    step.no=1;
+    step.circular=FALSE;
+    step.side=0;
+
+    s=GETSECT(from->sr->sector);
+    step.from_c=s->s.ceiling;
+    step.from_f=s->s.floor;
+
+    s=GETSECT(to->sr->sector);
+    step.to_c=s->s.ceiling;
+    step.to_f=s->s.floor;
+
+    CalcSteps();
+
+    if ((PickPoint("Create steps",&step.x,&step.y,PickDraw,PickKey,PickInfo))&&
+    	(ChooseSectorStyle(&s_flag,upper,middle,lower,floor,ceiling))&&
+	((type=SelectSector(hexen_mode))!=SECTOR_NULLID))
+    	{
+	Object o;
+	EditLine *el;
+	EditVert *ev[2][MAX_STEPS+2];
+	EditSect *s;
+	Sidedef *ns;
+	TextureMatch tm;
+	List side_sl[2],side_sr[2];
+	int n;
+	int v[2][MAX_STEPS+2];
+	int do_ceiling;
+	double fh,ch;
+	int prev_fh,prev_ch;
+	int in_sect[MAX_STEPS],sect,prev_sect;
+	int nl,flags;
+	int offy_c,offy_f,tw,th;
+	int f,r;
+
+	/* Create lists for mainting lines for afterward texture alignment
+	*/
+	for(f=0;f<2;f++)
+	    {
+	    side_sl[f]=ListNew(sizeof(TextureMatch));
+	    side_sr[f]=ListNew(sizeof(TextureMatch));
+	    }
+
+	if ((do_ceiling=GUI_yesno("Move ceiling with steps?")))
+	    ch=step.from_c+step.step_c;
+	else
+	    ch=MAX(step.to_c,step.from_c);
+
+	fh=step.from_f+step.step_f;
+
+	tw=CalcTextureWidth(upper,middle,lower);
+
+	TextureSize(middle,NULL,&th);
+
+	/* Create/get all the vertexes needed
+	*/
+	for(f=0;f<=step.no+1;f++)
+	    {
+	    if (f==0)
+		{
+		v[0][f]=step.from->l.from;
+		v[1][f]=step.from->l.to;
+		ev[0][f]=step.from->v[0];
+		ev[1][f]=step.from->v[1];
+		}
+	    else if (f==step.no+1)
+		{
+		if (step.swap)
+		    {
+		    v[1][f]=step.to->l.from;
+		    v[0][f]=step.to->l.to;
+		    ev[1][f]=step.to->v[0];
+		    ev[0][f]=step.to->v[1];
+		    }
+		else
+		    {
+		    v[0][f]=step.to->l.from;
+		    v[1][f]=step.to->l.to;
+		    ev[0][f]=step.to->v[0];
+		    ev[1][f]=step.to->v[1];
+		    }
+		}
+	    else
+		for(r=0;r<2;r++)
+		    {
+		    ev[r][f]=Grab(sizeof(EditVert));
+		    ev[r][f]->v.x=step.p[r][f].x;
+		    ev[r][f]->v.y=step.p[r][f].y;
+		    ev[r][f]->l=ListNew(sizeof(int));
+
+		    o.data=ev[r][f];
+		    o.select=SELECT_NONE;
+		    v[r][f]=MapSize(vertex);
+		    MapAdd(vertex,-1,&o);
+		    }
+
+	    /* While we're here, get all the containing sectors too
+	    */
+	    in_sect[f]=SectorInBox(step.p[0][f],step.p[1][f+1]);
+	    }
+
+	/* Delete current left sidedefs on the anchor lines
+	*/
+	if (step.from->l.left!=-1)
+	    DeleteLeftSidedef(step.from);
+
+	if (step.to->l.left!=-1)
+	    DeleteLeftSidedef(step.to);
+
+	/* Set up the flags for the 1st line and all the previous sector and
+	   height vars
+	*/
+	prev_fh=step.from_f;
+	prev_ch=step.from_c;
+	prev_sect=step.from->sr->sector;
+	offy_c=0;
+	offy_f=0;
+
+	/* Create the steps up to the last one
+	*/
+	for(f=0;f<=step.no;f++)
+	    {
+	    if (in_sect[f]!=-1)
+		s=GETSECT(in_sect[f]);
+	    else
+	    	s=NULL;
+
+	    sect=CreateUnboundSector
+		    (type,(int)fh,(int)ch,default_light_level,0,floor,ceiling);
+
+	    /* Create the linedef at the start of the step.  For the 1st step
+	       we adjust the original linedef.  Otherwise create a new one
+	    */
+	    if (!f)
+	    	{
+		el=step.from;
+		el->l.flags|=side2_mask;
+		el->l.flags&=~block_mask;
+
+		ns=Grab(sizeof(Sidedef));
+		ns->x=0;
+		ns->y=0;
+
+		el->l.flags|=upper_peg_mask;
+		el->l.flags&=~lower_peg_mask;
+
+		if (prev_ch>(int)ch)
+		    {
+		    strcpy(el->sr->upper,upper);
+		    strcpy(ns->upper,empty_texture);
+		    }
+		else if (prev_ch<(int)ch)
+		    {
+		    strcpy(el->sr->upper,empty_texture);
+		    strcpy(ns->upper,upper);
+		    }
+		else
+		    {
+		    strcpy(el->sr->upper,empty_texture);
+		    strcpy(ns->upper,empty_texture);
+		    }
+
+		if (prev_fh<(int)fh)
+		    {
+		    strcpy(el->sr->lower,lower);
+		    strcpy(ns->lower,empty_texture);
+		    }
+		else if (prev_fh>(int)fh)
+		    {
+		    strcpy(el->sr->lower,empty_texture);
+		    strcpy(ns->lower,lower);
+		    }
+		else
+		    {
+		    strcpy(el->sr->lower,empty_texture);
+		    strcpy(ns->lower,empty_texture);
+		    }
+
+		strcpy(el->sr->middle,empty_texture);
+		strcpy(ns->middle,empty_texture);
+
+		ns->sector=sect;
+
+		o.data=ns;
+		o.select=SELECT_NONE;
+
+		n=MapSize(sidedef);
+		MapAdd(sidedef,n,&o);
+		el->sl=ns;
+		el->l.left=n;
+		}
+	    else
+	    	{
+		flags=side2_mask|upper_peg_mask;
+
+		nl=CreateNewLinedef
+				(v[0][f],v[1][f],flags,normal_linedef,0,TRUE,
+				 0,0,prev_sect,
+				 (prev_ch > (int)ch) ? upper : empty_texture,
+				 empty_texture,
+				 (prev_fh < (int)fh) ? lower : empty_texture,
+				 0,0,sect,
+				 (prev_ch < (int)ch) ? upper : empty_texture,
+				 empty_texture,
+				 (prev_fh > (int)fh) ? lower : empty_texture);
+
+		/* Add the new linedef to the vertex lists
+		*/
+		IntListUniqAdd(ev[0][f]->l,nl);
+		IntListUniqAdd(ev[1][f]->l,nl);
+		}
+
+	    /* Create the linedefs for the walls
+	    */
+	    if (th)
+	    	{
+		offy_f-=(int)fh-prev_fh;
+
+		while (offy_f<0)
+		    offy_f+=th;
+
+		offy_f%=th;
+		}
+
+	    if (do_ceiling)
+		if (th)
+		    {
+		    offy_c-=(int)ch-prev_ch;
+
+		    while (offy_c<0)
+			offy_c+=th;
+
+		    offy_c%=th;
+		    }
+
+	    for(r=0;r<2;r++)
+	    	{
+		if (in_sect[f]==-1)
+		    {
+		    int offy;
+
+		    flags=block_mask;
+
+		    if (!do_ceiling)
+			{
+			flags|=upper_peg_mask;
+			offy=0;
+			}
+		    else
+		    	offy=offy_c;
+
+		    nl=CreateNewLinedef(v[r][f+r],v[r][f+(r^1)],
+		    			flags,normal_linedef,0,FALSE,
+					0,offy,sect,
+					empty_texture,
+					middle,
+					empty_texture,
+					0,0,-1,
+					empty_texture,
+					empty_texture,
+					empty_texture);
+
+		    tm.line=nl;
+
+		    if (r==0)
+		    	{
+			tm.apply=TRUE;
+			ListAppend(side_sr[r],&tm);
+			tm.apply=FALSE;
+			ListInsert(side_sl[r],&tm);
+			}
+		    else
+		    	{
+			tm.apply=TRUE;
+			ListInsert(side_sr[r],&tm);
+			tm.apply=FALSE;
+			ListAppend(side_sl[r],&tm);
+			}
+		    }
+		else
+		    {
+		    int offy_l,offy_r;
+
+		    flags=side2_mask;
+		    flags=side2_mask|lower_peg_mask|upper_peg_mask;
+
+		    if ((int)ch>s->s.ceiling)
+		    	offy_r=offy_c;
+		    else if ((int)fh<s->s.floor)
+		    	offy_r=offy_c;
+		    else
+		    	offy_r=0;
+
+		    offy_l=0;
+
+		    nl=CreateNewLinedef(v[r][f+r],v[r][f+(r^1)],
+		    			flags,normal_linedef,0,TRUE,
+					0,offy_r,sect,
+					((int)ch > s->s.ceiling) ?
+						upper : empty_texture,
+					empty_texture,
+					((int)fh < s->s.floor) ?
+						lower : empty_texture,
+					0,offy_l,in_sect[f],
+					((int)ch < s->s.ceiling) ?
+						upper : empty_texture,
+					empty_texture,
+					((int)fh > s->s.floor) ?
+						lower : empty_texture);
+
+		    tm.line=nl;
+
+		    if (r==0)
+		    	{
+			tm.apply=TRUE;
+			ListAppend(side_sr[r],&tm);
+			tm.apply=TRUE;
+			ListInsert(side_sl[r],&tm);
+			}
+		    else
+		    	{
+			tm.apply=TRUE;
+			ListInsert(side_sr[r],&tm);
+			tm.apply=TRUE;
+			ListAppend(side_sl[r],&tm);
+			}
+		    }
+
+		/* Add the new linedef to the vertex lists
+		*/
+		IntListUniqAdd(ev[r][f]->l,nl);
+		IntListUniqAdd(ev[r][f+1]->l,nl);
+		}
+
+	    prev_fh=(int)fh;
+	    prev_ch=(int)ch;
+
+	    fh+=step.step_f;
+
+	    if (do_ceiling)
+	    	ch+=step.step_c;
+
+	    prev_sect=sect;
+	    }
+
+	/* Adjust the end linedef anchor
+	*/
+	el=step.to;
+	el->l.flags|=side2_mask;
+	el->l.flags&=~block_mask;
+
+	ns=Grab(sizeof(Sidedef));
+	ns->x=0;
+	ns->y=0;
+
+	if ((prev_ch!=step.to_c)&&(s_flag&SSTYLE_UPPER_PEG))
+	    el->l.flags|=upper_peg_mask;
+	else if (!(s_flag&SSTYLE_LEAVE_PEG))
+	    el->l.flags&=~upper_peg_mask;
+
+	if ((prev_fh!=step.to_f)&&(s_flag&SSTYLE_LOWER_PEG))
+	    el->l.flags|=lower_peg_mask;
+	else if (!(s_flag&SSTYLE_LEAVE_PEG))
+	    el->l.flags&=~lower_peg_mask;
+
+	if (prev_ch<step.to_c)
+	    {
+	    strcpy(el->sr->upper,upper);
+	    strcpy(ns->upper,empty_texture);
+	    }
+	else if (prev_ch>step.to_c)
+	    {
+	    strcpy(el->sr->upper,empty_texture);
+	    strcpy(ns->upper,upper);
+	    }
+	else
+	    {
+	    strcpy(el->sr->upper,empty_texture);
+	    strcpy(ns->upper,empty_texture);
+	    }
+
+	if (prev_fh>step.to_f)
+	    {
+	    strcpy(el->sr->lower,lower);
+	    strcpy(ns->lower,empty_texture);
+	    }
+	else if (prev_fh<step.to_f)
+	    {
+	    strcpy(el->sr->lower,empty_texture);
+	    strcpy(ns->lower,lower);
+	    }
+	else
+	    {
+	    strcpy(el->sr->lower,empty_texture);
+	    strcpy(ns->lower,empty_texture);
+	    }
+
+	strcpy(el->sr->middle,empty_texture);
+	strcpy(ns->middle,empty_texture);
+
+	ns->sector=prev_sect;
+
+	o.data=ns;
+	o.select=SELECT_NONE;
+
+	n=MapSize(sidedef);
+	MapAdd(sidedef,n,&o);
+	el->sl=ns;
+	el->l.left=n;
+
+	/* Calculate the texture offsets for the walls
+	*/
+	for(f=0;f<2;f++)
+	    {
+	    ApplyTextureOffset(side_sl[f],tw,FALSE);
+	    ApplyTextureOffset(side_sr[f],tw,TRUE);
+
+	    ListClear(side_sl[f]);
+	    ListClear(side_sr[f]);
+	    }
+
+	SectorCalcContainingAll();
+
+	return(TRUE);
+	}
+    else
+    	return(FALSE);
+}
+
+
+/* ---------------------------------------- LINEDEF VECTOR MAP UTILS
+*/
+
+/* Note this is repeated, rather than shared with the sector vector map to save
+   any unexpected later interactions
+*/
+static int	vno=0;
+static char	*vmap=NULL;
+
+static void InitVMAP(void)
+{
+    VIDOOM_TRACE;
+
+    if (vno<MapSize(vertex))
+    	vmap=ReGrab(vmap,MapSize(vertex));
+
+    memset(vmap,FALSE,MapSize(vertex));
+}
+
+
+/* ---------------------------------------- SECTOR LINEDEF MAP UTILS
+*/
+static int      lno=0;
+static char     *lmap=NULL;
+
+static void InitLMAP(void)
+{
+    VIDOOM_TRACE;
+
+    if (lno<MapSize(linedef))
+	lmap=ReGrab(lmap,MapSize(linedef));
+
+    memset(lmap,FALSE,MapSize(linedef));
+}
+
+
+/* ---------------------------------------- LINEDEF TRACK FUNCTIONS
+*/
+List TrackLinedef(int line_no)
+{
+    EditSect *s;
+    EditLine *l;
+    List ll;
+    Iterator i;
+    int sec_no;
+    int done;
+    int f;
+    int vert_no;
+
+    VIDOOM_TRACE;
+
+    if (!(l=GETLINE(line_no)))
+    	return(NULL);
+
+    InitLMAP();
+
+    lmap[line_no]=TRUE;
+
+    ll=ListNew(sizeof(int));
+    ListAppend(ll,&line_no);
+
+    sec_no=l->sr->sector;
+
+    if (!(s=GETSECT(sec_no)))
+	return(ll);
+
+    vert_no=l->l.to;
+
+    /* If the start LINEDEF is 2-sided and wholy within the sector, we only
+       track along connected 2-sided lines in the same sector.
+
+       If the start line is 1-sided then we allow both 1 and 2 sided LINEDEFs
+       in the resulting list, but only 2 sided LINEDEFs that just have this
+       sector on one side of the line.
+
+       To make this easier we mark the LMAP entries for those lines we wish to
+       ignore before starting.
+    */
+    if ((l->sl)&&(l->sl->sector==sec_no))
+        {
+	i=ListIterator(s->all);
+
+	while(i)
+	    {
+	    memcpy(&l,IteratorData(i),sizeof(l));
+
+	    if (!l->sl)
+	    	lmap[l->no]=TRUE;
+	    else
+		if (!((l->sl->sector==sec_no)&&(l->sr->sector==sec_no)))
+		    lmap[l->no]=TRUE;
+
+	    i=IteratorNext(i);
+	    }
+	}
+    else
+    	{
+	i=ListIterator(s->all);
+
+	while(i)
+	    {
+	    memcpy(&l,IteratorData(i),sizeof(l));
+
+	    if ((l->sl)&&(l->sl->sector==sec_no)&&(l->sr->sector==sec_no))
+	    	lmap[l->no]=TRUE;
+
+	    i=IteratorNext(i);
+	    }
+	}
+
+    done=FALSE;
+
+    while(!done)
+    	{
+	done=TRUE;
+
+	i=ListIterator(s->all);
+
+	while(i)
+	    {
+	    memcpy(&l,IteratorData(i),sizeof(l));
+
+	    f=l->no;
+
+	    if (!lmap[f])
+		{
+		/* We need two seperate checks, as obviously left sidedefs
+		   pointing into the sector will need TO, rather than FROM,
+		   checking
+		*/
+		if ((l->sr->sector==sec_no)&&(l->l.from==vert_no))
+		    {
+		    lmap[f]=TRUE;
+		    ListAppend(ll,&f);
+		    done=FALSE;
+		    vert_no=l->l.to;
+		    }
+		else if ((l->sl)&&(l->sl->sector==sec_no)&&(l->l.to==vert_no))
+		    {
+		    lmap[f]=TRUE;
+		    ListAppend(ll,&f);
+		    done=FALSE;
+		    vert_no=l->l.from;
+		    }
+		}
+
+	    i=IteratorNext(i);
+	    }
+	}
+
+    return(ll);
+}
+
+
+/* ---------------------------------------- LINEDEF MERGING
+*/
+void CheckMergeLinedef(EditVert *v)
+{
+    Iterator i;
+    int *f;
+    int r;
+    EditLine *ol,*cl;
+    int same_dir;
+    int merge;
+
+    VIDOOM_TRACE;
+
+    i=ListIterator(v->l);
+
+    while(i)
+    	{
+	f=IteratorData(i);
+
+	ol=GETLINE(*f);
+
+	for(r=0;r<MapSize(linedef);r++)
+	    if ((r!=*f)&&(cl=GETLINE(r)))
+		{
+		if (((cl->l.from==ol->l.from)&&(cl->l.to==ol->l.to))||
+		    ((cl->l.from==ol->l.to)&&(cl->l.to==ol->l.from)))
+		    {
+		    if ((cl->l.from==ol->l.from)&&(cl->l.to==ol->l.to))
+		    	same_dir=TRUE;
+		    else
+		    	same_dir=FALSE;
+
+		    if(merge_linedef==MERGE_ASK)
+			merge=YesNo("Linedefs %d and %d overlap. Merge?",*f,r);
+		    else
+		    	merge=TRUE;
+
+		    if (merge)
+			{
+			if (same_dir)
+			    {
+			    if (cl->l.left!=-1)
+			    	{
+				DeleteLeftSidedef(ol);
+				ol->l.left=cl->l.left;
+				ol->sl=GETSIDE(ol->l.left);
+				ol->l.flags|=side2_mask;
+
+				if (auto_block_linedefs)
+				    ol->l.flags&=~block_mask;
+				}
+			    }
+			else
+			    {
+			    DeleteLeftSidedef(ol);
+			    ol->l.left=cl->l.right;
+			    ol->sl=GETSIDE(ol->l.left);
+			    ol->l.flags|=side2_mask;
+
+			    if (auto_block_linedefs)
+				ol->l.flags&=~block_mask;
+			    }
+
+			DeleteLinedef(r);
+			}
+		    }
+		}
+
+	i=IteratorNext(i);
+	}
+}
+
+
+/* ---------------------------------------- LINEDEF CREATION
+*/
+int CreateNewLinedef(int from, int to,
+		     int flags, int type, int tag, int two_sided,
+		     int sr_ox, int sr_oy, int sr_sector,
+		     DirName sr_upper, DirName sr_middle, DirName sr_lower,
+		     int sl_ox, int sl_oy, int sl_sector,
+		     DirName sl_upper, DirName sl_middle, DirName sl_lower)
+{
+    Object o;
+    EditLine *l;
+    Sidedef *s;
+    int ln,srn,sln,f;
+
+    VIDOOM_TRACE;
+
+    ln=MapSize(linedef);
+
+    srn=MapSize(sidedef);
+
+    if (two_sided)
+	sln=srn+1;
+    else
+	sln=-1;
+
+    o.select=SELECT_NONE;
+
+    s=Grab(sizeof(Sidedef));
+    s->x=sr_ox;
+    s->y=sr_oy;
+    s->sector=sr_sector;
+    strcpy(s->upper,sr_upper);
+    strcpy(s->middle,sr_middle);
+    strcpy(s->lower,sr_lower);
+    o.data=s;
+    MapAdd(sidedef,srn,&o);
+
+    if (sln!=-1)
+	{
+	s=Grab(sizeof(Sidedef));
+	s->x=sl_ox;
+	s->y=sl_oy;
+	s->sector=sl_sector;
+	strcpy(s->upper,sl_upper);
+	strcpy(s->middle,sl_middle);
+	strcpy(s->lower,sl_lower);
+	o.data=s;
+	MapAdd(sidedef,sln,&o);
+	}
+
+    l=Grab(sizeof(EditLine));
+
+    l->no=ln;
+
+    l->l.from=from;
+    l->l.to=to;
+
+    l->l.flags=flags;
+    l->l.type=type;
+    l->l.tag=tag;
+
+    for(f=0;f<5;f++)
+	l->l.args[f]=0;
+
+    l->v[0]=GETVERT(l->l.from);
+    l->v[1]=GETVERT(l->l.to);
+
+    l->l.right=srn;
+    l->l.left=sln;
+
+    l->sr=GETSIDE(srn);
+
+    if (sln!=-1)
+	l->sl=GETSIDE(sln);
+    else
+	l->sl=NULL;
+
+    if (edit_mode==LINEDEF_MODE)
+	switch(insert_select)
+	    {
+	    case HOVER_NONE:
+		o.select=SELECT_NONE;
+		break;
+	    case HOVER_ADD:
+	    case HOVER_SINGLE:
+		o.select=SELECT_SELECTED;
+		break;
+	    }
+    else
+	o.select=SELECT_NONE;
+
+    LineCalcBounding(l);
+    o.data=l;
+    MapAdd(linedef,ln,&o);
+
+    if (edit_mode==LINEDEF_MODE)
+	switch(insert_select)
+	    {
+	    case HOVER_NONE:
+		break;
+	    case HOVER_ADD:
+		ListAppend(selected,&ln);
+		break;
+	    case HOVER_SINGLE:
+		ClearSelection();
+		o.select=SELECT_SELECTED;
+		ListAppend(selected,&ln);
+		FullRedraw();
+		break;
+	    }
+
+    return(ln);
+}
+
+
+/* ---------------------------------------- HEXEN TAG RESOLVING
+*/
+void SetHexenLinedefTag(EditLine *l)
+{
+   char *nm;
+   char *a[5];
+   int f;
+
+   l->l.tag=0;
+
+   nm=SpecialName(l->l.type,a);
+
+   if (!STREQ(nm,"UNKNOWN"))
+	for(f=0;f<5;f++)
+	    if (STREQ(a[f],"tag"))
+	    	{
+		l->l.tag=l->l.args[f];
+		f=6;
+		}
+}
+
+
+/* ---------------------------------------- GENERIC LINEDEF FUNCS
+*/
+int PositionOnObject_LINEDEF(int x,int y,void *data)
+{
+    EditLine *l;
+
+    VIDOOM_TRACE;
+
+    l=data;
+
+    /*
+    if (scale<4)
+	box=BOXBOUND_FUZZY(x,y,l->min_x,l->min_y,l->max_x,l->max_y,2);
+    else
+    	box=BOXBOUND_FUZZY(x,y,l->min_x,l->min_y,l->max_x,l->max_y,scale/2);
+
+    if (!box)
+	return(FALSE);
+    */
+
+    if(LinesCross(x-(scale*linedef_select),y,x+(scale*linedef_select),y,
+		      l->v[0]->v.x,l->v[0]->v.y,
+		      l->v[1]->v.x,l->v[1]->v.y))
+	return(TRUE);
+
+    return(LinesCross(x,y-(scale*linedef_select),x,y+(scale*linedef_select),
+		      l->v[0]->v.x,l->v[0]->v.y,
+		      l->v[1]->v.x,l->v[1]->v.y));
+}
+
+
+void SelectBox_LINEDEF(int x1,int y1,int x2,int y2)
+{
+    Object *o;
+    EditLine *l;
+    int f;
+
+    VIDOOM_TRACE;
+
+    for(f=0;f<MapSize(linedef);f++)
+    	{
+	o=MapElem(linedef,f);
+
+	if ((l=o->data))
+	    {
+	    if ((o->select!=SELECT_SELECTED)&&
+	    		(BOXBOUND(l->v[0]->v.x,l->v[0]->v.y,x1,y1,x2,y2))&&
+	    		(BOXBOUND(l->v[1]->v.x,l->v[1]->v.y,x1,y1,x2,y2)))
+		{
+		SetSelect(f,SELECT_SELECTED);
+		ListAppend(selected,&f);
+		}
+	    }
+	}
+}
+
+
+void SelectByType_LINEDEF(void)
+{
+    Object *o;
+    EditLine *l;
+    int id;
+    int f;
+
+    if (hexen_mode)
+    	{
+	if ((id=SelectSpecial())==SPECIAL_NULLID)
+	    id=LINEDEF_NULLID;
+	}
+    else
+	id=SelectLinedef();
+
+
+    if (id!=LINEDEF_NULLID)
+    	{
+	ClearSelection();
+
+	for(f=0;f<MapSize(linedef);f++)
+	    if ((o=MapElem(linedef,f)))
+		if ((l=o->data)&&(l->l.type==id))
+		    {
+		    SetSelect(f,SELECT_SELECTED);
+		    ListAppend(selected,&f);
+		    }
+	}
+}
+
+
+void DrawObject_LINEDEF(void *data, int selmode)
+{
+    static List hilite=NULL;
+    static int drawn=FALSE;
+    Iterator i;
+    EditLine *l;
+    EditLine *sl=NULL;
+    EditSect *s;
+    Object *o;
+    int f;
+
+    VIDOOM_TRACE;
+
+    if (!hilite)
+	hilite=ListNew(sizeof(int));
+
+    l=data;
+
+    /* If the current object has changed, remove the highlighted tag objects
+    */
+    if ((current==-1)&&(drawn))
+    	{
+	drawn=FALSE;
+	RemoveHighlights(hilite);
+	ListEmpty(hilite);
+	}
+
+    /* Draw tagged sectors
+    */
+    if ((tag_highlight)&&(current==l->no))
+    	{
+	RemoveHighlights(hilite);
+	ListEmpty(hilite);
+
+	if (l->l.tag)
+	    {
+	    drawn=TRUE;
+
+	    for(f=0;f<MapSize(sector);f++)
+		if ((s=GETSECT(f)))
+		    if ((s->s.tag==l->l.tag)&&(SectorOnDisplay(s)))
+			{
+			i=ListIterator(s->all);
+
+			while(i)
+			    {
+			    memcpy(&sl,IteratorData(i),sizeof(sl));
+			    o=MapElem(linedef,sl->no);
+
+			    if (o->select==SELECT_NONE)
+			    	{
+				ListAppend(hilite,&(sl->no));
+				DrawLinedef(sl,TAGCOL);
+				}
+
+			    i=IteratorNext(i);
+			    }
+			}
+	    }
+
+	}
+
+    /* Only draw the line if it's not been drawn tagged or is selected.
+    */
+    if ((!tag_highlight)||(selmode==SELECT_SELECTED)||
+    					(!InIntList(hilite,l->no)))
+	DrawLinedef(data,SelColour(selmode));
+}
+
+
+void DrawObjectInfo_LINEDEF(void)
+{
+    EditLine *l;
+    char *p;
+    char *nm=NULL;
+    char *a[5];
+
+    VIDOOM_TRACE;
+
+    if (!draw_current_info)
+    	return;
+
+    if ((current!=-1)&&((l=GETLINE(current))))
+	{
+	if (hexen_mode)
+	    nm=SpecialName(l->l.type,a);
+
+	if (show_full_linedef_info)
+	    {
+	    if (hexen_mode)
+		GuiDrawInfoBox("LINEDEF",GUI_CENTRE,GUI_FLUSH_LOWER,FALSE,
+				"Linedef No : %-5d|"
+				"Flags      : %s|"
+				"Special    : %-35.35s|"
+				"%-10.10s : %-3d|"
+				"%-10.10s : %-3d|"
+				"%-10.10s : %-3d|"
+				"%-10.10s : %-3d|"
+				"%-10.10s : %-3d",
+				    current,
+				    FlagText(hexen_mode,LINEDEF_FLAGS,
+				    				l->l.flags),
+				    nm,
+				    (a[0] ? a[0] : "N/A"),l->l.args[0],
+				    (a[1] ? a[1] : "N/A"),l->l.args[1],
+				    (a[2] ? a[2] : "N/A"),l->l.args[2],
+				    (a[3] ? a[3] : "N/A"),l->l.args[3],
+				    (a[4] ? a[4] : "N/A"),l->l.args[4]);
+	    else
+		GuiDrawInfoBox("LINEDEF",GUI_CENTRE,GUI_FLUSH_LOWER,FALSE,
+				"Linedef No : %-5d|"
+				"Flags      : %s|"
+				"Type [%4.4x]: %-35.35s|"
+				"Tag        : %-5d",
+				    current,
+				    FlagText(hexen_mode,
+				    		LINEDEF_FLAGS,l->l.flags),
+				    l->l.type,
+				    (p=GenLineName(hexen_mode,l->l.type,
+							    LinedefName)) ?
+						    p:LinedefName(l->l.type),
+				    l->l.tag);
+	    }
+	else
+	    {
+	    if (hexen_mode)
+	    	{
+		GuiDrawInfoBox("LINEDEF",GUI_CENTRE,GUI_FLUSH_LOWER,FALSE,
+				"Linedef No : %-5d|"
+				"Flags      : %s|"
+				"Special    : %-20.20s|"
+				"%-10.10s : %-3d|"
+				"%-10.10s : %-3d|"
+				"%-10.10s : %-3d|"
+				"%-10.10s : %-3d|"
+				"%-10.10s : %-3d",
+				    current,
+				    FlagText(hexen_mode,LINEDEF_FLAGS,
+				    				l->l.flags),
+				    nm,
+				    (a[0] ? a[0] : "N/A"),l->l.args[0],
+				    (a[1] ? a[1] : "N/A"),l->l.args[1],
+				    (a[2] ? a[2] : "N/A"),l->l.args[2],
+				    (a[3] ? a[3] : "N/A"),l->l.args[3],
+				    (a[4] ? a[4] : "N/A"),l->l.args[4]);
+		}
+	    else
+	    	{
+		if (GenLineClass(hexen_mode,l->l.type,LinedefClass))
+		    GuiDrawInfoBox("LINEDEF",GUI_CENTRE,GUI_FLUSH_LOWER,FALSE,
+				    "Linedef No : %-5d|"
+				    "Flags      : %s|"
+				    "Type [%4.4x]: %-14.14s [Gen]|"
+				    "Tag        : %-5d",
+					current,
+					FlagText(hexen_mode,LINEDEF_FLAGS,
+								l->l.flags),
+					l->l.type,
+					GenLineClass(hexen_mode,
+						     l->l.type,LinedefClass),
+					l->l.tag);
+		else
+		    GuiDrawInfoBox("LINEDEF",GUI_CENTRE,GUI_FLUSH_LOWER,FALSE,
+				    "Linedef No : %-5d|"
+				    "Flags      : %s|"
+				    "Type [%4.4x]: %-20.20s|"
+				    "Tag        : %-5d",
+					current,
+					FlagText(hexen_mode,LINEDEF_FLAGS,
+								l->l.flags),
+					l->l.type,
+					LinedefClass(l->l.type),
+					l->l.tag);
+		}
+	    }
+
+	GuiDrawInfoBox("RIGHT SIDEDEF",GUI_FLUSH_RIGHT,GUI_FLUSH_LOWER,FALSE,
+			"Offset : %d,%d|"
+			"Upper  : %-10s|"
+			"Middle : %-10s|"
+			"Lower  : %-10s|"
+			"Sector : %d",
+			    l->sr->x,l->sr->y,
+			    l->sr->upper,l->sr->middle,l->sr->lower,
+			    l->sr->sector);
+
+	if (l->sl)
+	    GuiDrawInfoBox("LEFT SIDEDEF",GUI_FLUSH_LEFT,GUI_FLUSH_LOWER,FALSE,
+			    "Offset : %d,%d|"
+			    "Upper  : %-10s|"
+			    "Middle : %-10s|"
+			    "Lower  : %-10s|"
+			    "Sector : %d",
+				l->sl->x,l->sl->y,
+				l->sl->upper,l->sl->middle,l->sl->lower,
+				l->sl->sector);
+	else
+	    GuiDrawInfoBox("NO LEFT SIDEDEF",GUI_FLUSH_LEFT,
+	    					GUI_FLUSH_LOWER,FALSE,
+			    " |"
+			    "         %-10s|"
+			    " |"
+			    " |"
+			    " ","");
+	}
+    else
+	{
+	if (show_full_linedef_info)
+	    if (hexen_mode)
+		GuiDrawInfoBox("LINEDEF",GUI_CENTRE,GUI_FLUSH_LOWER,FALSE,
+				"Linedef No : -|"
+				"Flags      : -|"
+				"Special    : %35s|"
+				"-          : -|"
+				"-          : -|"
+				"-          : -|"
+				"-          : -|"
+				"-          : -","");
+	    else
+		GuiDrawInfoBox("LINEDEF",GUI_CENTRE,GUI_FLUSH_LOWER,FALSE,
+				"Linedef No : -|"
+				"Flags      : -|"
+				"Type       : %35s|"
+				"Tag        : -","");
+	else
+	    if (hexen_mode)
+		GuiDrawInfoBox("LINEDEF",GUI_CENTRE,GUI_FLUSH_LOWER,FALSE,
+				"Linedef No : -|"
+				"Flags      : -|"
+				"Special    : %20s|"
+				"-          : -|"
+				"-          : -|"
+				"-          : -|"
+				"-          : -|"
+				"-          : -","");
+	    else
+		GuiDrawInfoBox("LINEDEF",GUI_CENTRE,GUI_FLUSH_LOWER,FALSE,
+				"Linedef No : -|"
+				"Flags      : -|"
+				"Type       : %20s|"
+				"Tag        : -","");
+
+	GuiDrawInfoBox("RIGHT SIDEDEF",GUI_FLUSH_RIGHT,GUI_FLUSH_LOWER,FALSE,
+			" |"
+			"         %-10s|"
+			" |"
+			" |"
+			" ","");
+
+	GuiDrawInfoBox("LEFT SIDEDEF",GUI_FLUSH_LEFT,GUI_FLUSH_LOWER,FALSE,
+			" |"
+			"         %-10s|"
+			" |"
+			" |"
+			" ","");
+	}
+}
+
+
+void DrawObjectHeader_LINEDEF(void)
+{
+    if (tag_highlight)
+	GFX_print(0,FH,WHITE,"Tag highlight: ON");
+    else
+	GFX_print(0,FH,WHITE,"Tag highlight: OFF");
+}
+
+
+void MoveObject_LINEDEF(void)
+{
+    GFXEvent ev;
+    int omx,omy;
+    int dmx,dmy;
+    int done;
+    Iterator i;
+    Iterator i2;
+    EditLine *l;
+    List orig;
+    int *f,r;
+    Point p;
+    unsigned char *vmap;
+    int cancel;
+
+    VIDOOM_TRACE;
+
+    omx=SnapX(XToMap(ms.x));
+    omy=SnapY(YToMap(ms.y));
+    GFX_bounce();
+
+    done=FALSE;
+    cancel=FALSE;
+    orig=ListNew(sizeof(Point));
+
+    vmap=Grab(MapSize(vertex));
+
+    i=ListIterator(selected);
+
+    while(i)
+    	{
+	f=IteratorData(i);
+	l=GETLINE(*f);
+	p.x=l->v[0]->v.x;
+	p.y=l->v[0]->v.y;
+	ListAppend(orig,&p);
+	p.x=l->v[1]->v.x;
+	p.y=l->v[1]->v.y;
+	ListAppend(orig,&p);
+	i=IteratorNext(i);
+	}
+
+    while(!done)
+    	{
+	GuiDrawInfoBox("Move LINEDEF",GUI_FLUSH_RIGHT,GUI_FLUSH_LOWER,FALSE,
+				"Left mouse button to place|ESC to cancel");
+
+	GFX_redraw();
+	GFX_await_input_full(&ev);
+
+	switch(ev.type)
+	    {
+	    case GFX_KEY_EVENT:
+		HandleMoveKey(ev.key,FALSE);
+
+		/* Cancel the move
+		*/
+		if (ev.key.code==GFX_ESC)
+		    {
+		    cancel=TRUE;
+
+		    i=ListIterator(selected);
+		    i2=ListIterator(orig);
+
+		    while(i2)
+		    	{
+			f=IteratorData(i);
+
+			l=GETLINE(*f);
+
+			memcpy(&p,IteratorData(i2),sizeof(Point));
+			l->v[0]->v.x=p.x;
+			l->v[0]->v.y=p.y;
+			i2=IteratorNext(i2);
+
+			memcpy(&p,IteratorData(i2),sizeof(Point));
+			l->v[1]->v.x=p.x;
+			l->v[1]->v.y=p.y;
+			i2=IteratorNext(i2);
+
+			i=IteratorNext(i);
+			}
+
+		    done=TRUE;
+		    dmx=0;
+		    dmy=0;
+		    }
+		else
+		    {
+		    dmx=SnapX(XToMap(ms.x))-omx;
+		    dmy=SnapY(YToMap(ms.y))-omy;
+		    }
+
+		break;
+
+	    case GFX_MOUSE_EVENT:
+		memcpy(&ms,&ev.mouse,sizeof(ev.mouse));
+
+		if (ms.b&GFX_BUTLEFT)
+		    done=TRUE;
+
+		dmx=SnapX(XToMap(ms.x))-omx;
+		dmy=SnapY(YToMap(ms.y))-omy;
+		break;
+
+	    default:
+		dmx=0;
+		dmy=0;
+	    	break;
+	    }
+	
+	if ((dmx)||(dmy))
+	    {
+	    for(r=0;r<MapSize(vertex);r++)
+	    	vmap[r]=FALSE;
+
+	    i=ListIterator(selected);
+	    while(i)
+		{
+		f=IteratorData(i);
+
+		l=GETLINE(*f);
+
+		if (!vmap[l->l.from])
+		    {
+		    l->v[0]->v.x+=dmx;
+		    l->v[0]->v.y+=dmy;
+		    vmap[l->l.from]=TRUE;
+		    }
+
+		if (!vmap[l->l.to])
+		    {
+		    l->v[1]->v.x+=dmx;
+		    l->v[1]->v.y+=dmy;
+		    vmap[l->l.to]=TRUE;
+		    }
+
+		i=IteratorNext(i);
+		}
+
+	    omx=SnapX(XToMap(ms.x));
+	    omy=SnapY(YToMap(ms.y));
+
+	    FullRedraw();
+	    }
+	}
+
+    ListClear(orig);
+    Release(vmap);
+
+    if ((clear_on_move)&&(!cancel))
+    	ClearSelection();
+
+    FullRedraw();
+}
+
+
+void RotateObject_LINEDEF(double angle)
+{
+    int cx,cy;
+    int x,y;
+    int *f;
+    Iterator i;
+    EditLine *l;
+
+    VIDOOM_TRACE;
+
+    InitVMAP();
+
+    LineSelectionCentre(&cx,&cy);
+
+    i=ListIterator(selected);
+
+    while(i)
+	{
+	f=IteratorData(i);
+	l=GETLINE(*f);
+
+	if (!vmap[l->l.from])
+	    {
+	    vmap[l->l.from]=TRUE;
+	    x=l->v[0]->v.x;
+	    y=l->v[0]->v.y;
+
+	    Rotate(cx,cy,&x,&y,angle);
+
+	    l->v[0]->v.x=x;
+	    l->v[0]->v.y=y;
+	    }
+
+	if (!vmap[l->l.to])
+	    {
+	    vmap[l->l.to]=TRUE;
+	    x=l->v[1]->v.x;
+	    y=l->v[1]->v.y;
+
+	    Rotate(cx,cy,&x,&y,angle);
+
+	    l->v[1]->v.x=x;
+	    l->v[1]->v.y=y;
+	    }
+
+	i=IteratorNext(i);
+	}
+}
+
+
+void ScaleObject_LINEDEF(double scale)
+{
+    int cx,cy;
+    int x,y;
+    int *f;
+    Iterator i;
+    EditLine *l;
+
+    VIDOOM_TRACE;
+
+    LineSelectionCentre(&cx,&cy);
+
+    i=ListIterator(selected);
+
+    while(i)
+	{
+	f=IteratorData(i);
+	l=GETLINE(*f);
+
+	x=l->v[0]->v.x;
+	y=l->v[0]->v.y;
+
+	Scale(cx,cy,&x,&y,scale);
+
+	l->v[0]->v.x=x;
+	l->v[0]->v.y=y;
+
+	x=l->v[1]->v.x;
+	y=l->v[1]->v.y;
+
+	Scale(cx,cy,&x,&y,scale);
+
+	l->v[1]->v.x=x;
+	l->v[1]->v.y=y;
+
+	i=IteratorNext(i);
+	}
+}
+
+
+void SetTagObject_LINEDEF(int tag)
+{
+    int *f;
+    Iterator i;
+    EditLine *l;
+
+    VIDOOM_TRACE;
+
+    if (hexen_mode)
+    	return;
+
+    i=ListIterator(selected);
+    
+    while(i)
+    	{
+	f=IteratorData(i);
+	l=GETLINE(*f);
+	l->l.tag=tag;
+	i=IteratorNext(i);
+	}
+}
+
+
+void LocateObject_LINEDEF(void *obj)
+{
+    int cx,cy;
+    EditLine *l;
+
+    VIDOOM_TRACE;
+
+    l=obj;
+    cx=l->min_x+(l->max_x-l->min_x)/2;
+    cy=l->min_y+(l->max_y-l->min_y)/2;
+    ox=cx-scale*SCRW/2;
+    oy=cy+scale*SCRH/2;
+}
+
+
+void ObjectInsert_LINEDEF(void)
+{
+    int type;
+    int fl,two;
+    DirName sr_upper,sr_lower,sr_middle;
+    DirName sl_upper,sl_lower,sl_middle;
+    int ok;
+    int from,to;
+    int nl;
+    EditVert *v;
+
+    VIDOOM_TRACE;
+
+    if (MapSize(vertex)<2)
+    	GuiInfoBox("ERROR","Need more that 2 vertices|to make a line");
+    else
+    	{
+	vertex_dialog[D_VERTEX_FROM].data.i=MapSize(vertex)-2;
+	vertex_dialog[D_VERTEX_TO].data.i=MapSize(vertex)-1;
+
+	ok=GUI_dialog("Create LINEDEF",D_VERTEX_NO,vertex_dialog);
+
+	if (ok)
+	    {
+	    from=vertex_dialog[D_VERTEX_FROM].data.i;
+	    to=vertex_dialog[D_VERTEX_TO].data.i;
+
+	    if ((from>=MapSize(vertex))||(from<0)||(!GETVERT(from)))
+		{
+		GuiInfoBox("ERROR","%d (from) is an invalid vertex",from);
+		ok=FALSE;
+		}
+	    else if ((to>=MapSize(vertex))||(to<0)||(!GETVERT(to)))
+		{
+		GuiInfoBox("ERROR","%d (to) is an invalid vertex",to);
+		ok=FALSE;
+		}
+	    }
+
+	if (ok)
+	    if (GetLinedefValues(TRUE,0,0,0,0,
+	    			 &type,&fl,&two,
+				 sr_upper,sr_middle,sr_lower,
+				 sl_upper,sl_middle,sl_lower))
+		{
+		nl=CreateNewLinedef(from,to,
+				    fl,type,0,two,
+				    0,0,0,
+				    sr_upper,sr_middle,sr_lower,
+				    0,0,0,
+				    sl_upper,sl_middle,sl_lower);
+
+		v=GETVERT(from);
+		IntListUniqAdd(v->l,from);
+		v=GETVERT(to);
+		IntListUniqAdd(v->l,from);
+
+		FullRedraw();
+		}
+	}
+}
+
+
+void ObjectDelete_LINEDEF(void)
+{
+    Iterator i;
+    int *f;
+
+    VIDOOM_TRACE;
+
+    i=ListIterator(selected);
+
+    while(i)
+    	{
+	f=IteratorData(i);
+	DeleteLinedef(*f);
+	i=IteratorNext(i);
+	}
+
+    SectorCalcContainingAll();
+    ClearSelection();
+    FullRedraw();
+}
+
+
+void ObjectMenu_LINEDEF(void)
+{
+    static int ax=0;
+    static int ay=0;
+    EditLine *l;
+    int f,*s;
+    Iterator i;
+    int cancel;
+    int opt;
+
+    VIDOOM_TRACE;
+
+    s=NULL;
+    cancel=FALSE;
+    GFX_redraw();
+
+    if (hexen_mode)
+	opt=GUI_menu("Linedef/sidedef",ms.x,ms.y,
+					linedef_popup_hexen,GUI_CANCEL);
+    else
+	opt=GUI_menu("Linedef/sidedef",ms.x,ms.y,linedef_popup,GUI_CANCEL);
+
+    switch(opt)
+	{
+	case TM_TYPE:
+	    {
+	    f=SelectLinedef();
+
+	    if (f!=LINEDEF_NULLID)
+		{
+		i=ListIterator(selected);
+
+		while(i)
+		    {
+		    s=IteratorData(i);
+		    l=GETLINE(*s);
+		    l->l.type=f;
+		    i=IteratorNext(i);
+		    }
+
+		FullRedraw();
+		}
+	    break;
+	    }
+
+	case TM_SPECIAL:
+	    {
+	    Short id;
+
+	    id=(Short)SelectSpecial();
+
+	    if (id!=SPECIAL_NULLID)
+		{
+		i=ListIterator(selected);
+
+		while(i)
+		    {
+		    s=IteratorData(i);
+		    l=GETLINE(*s);
+		    l->l.type=id;
+		    SetHexenLinedefTag(l);
+		    i=IteratorNext(i);
+		    }
+
+		FullRedraw();
+		}
+	    break;
+	    }
+
+	case TM_GEN_TYPE:
+	    if (GenLineNoClasses(hexen_mode))
+		{
+		l=SelHead();
+		f=SelectGenLine(hexen_mode,l->l.type);
+
+		if (f!=GENLINE_NULLID)
+		    {
+		    i=ListIterator(selected);
+
+		    while(i)
+			{
+			s=IteratorData(i);
+			l=GETLINE(*s);
+			l->l.type=f;
+			i=IteratorNext(i);
+			}
+
+		    FullRedraw();
+		    }
+		}
+	    else
+		GuiInfoBox("ERROR","No generalised linedefs defined|in config");
+	    break;
+
+	case TM_VAL:
+	    {
+	    static int id;
+
+	    if (GetNumber("Enter LINEDEF type",&id))
+		{
+		i=ListIterator(selected);
+
+		while(i)
+		    {
+		    s=IteratorData(i);
+		    l=GETLINE(*s);
+		    l->l.type=id;
+		    i=IteratorNext(i);
+		    }
+
+		FullRedraw();
+		}
+	    }
+	    break;
+
+	case TM_FLAGS:
+	    l=SelHead();
+	    f=l->l.flags;
+
+	    if (SelectFlags(hexen_mode,LINEDEF_FLAGS,&f))
+		{
+		int new_side;
+		List new;
+
+		new=ListNew(sizeof(int));
+		new_side=FALSE;
+
+		i=ListIterator(selected);
+
+		while(i)
+		    {
+		    int new_f;
+
+		    new_f=f;
+		    s=IteratorData(i);
+		    l=GETLINE(*s);
+
+		    /* If the line was 2 sided, and is now one - removed the
+		       left sidedef
+		    */
+		    if ((l->l.flags&side2_mask)&&(!(new_f&side2_mask)))
+			{
+			DeleteLeftSidedef(l);
+
+			if (auto_block_linedefs)
+			    new_f|=block_mask;
+			}
+
+		    /* If the line was 1 sided, and is now two - add the
+		       left sidedef
+		    */
+		    if ((!(l->l.flags&side2_mask))&&(new_f&side2_mask))
+		    	{
+			Object o;
+			Sidedef *ns;
+			int n;
+
+			ns=Grab(sizeof(Sidedef));
+			ns->x=0;
+			ns->y=0;
+			strcpy(ns->upper,empty_texture);
+			strcpy(ns->middle,empty_texture);
+			strcpy(ns->lower,empty_texture);
+			ns->sector=-1;
+
+			o.data=ns;
+			o.select=SELECT_NONE;
+
+			n=MapSize(sidedef);
+			MapAdd(sidedef,n,&o);
+			l->sl=ns;
+			l->l.left=n;
+
+			new_side=TRUE;
+
+			ListAppend(new,s);
+
+			if (auto_block_linedefs)
+			    new_f&=~block_mask;
+			}
+
+		    l->l.flags=new_f;
+		    i=IteratorNext(i);
+		    }
+
+		if (new_side)
+		    switch(new_2sided_select)
+		    	{
+			case NEWSELECT_NEVER:
+			    GuiInfoBox("NOTICE","Left SIDEDEFS have been added|"
+						"to some or all LINEDEFS");
+			    break;
+
+			/* WARNING: This case cascades into the following
+			            one
+			*/
+			case NEWSELECT_ASK:
+			    if (!YesNo("New left SIDEDEFS created.  "
+						    "Select those LINEDEFS?"))
+				break;
+			case NEWSELECT_SELECT:
+			    {
+			    Object *o;
+
+			    new_selection=TRUE;
+			    ClearSelection();
+			    i=ListIterator(new);
+
+			    while(i)
+				{
+				s=IteratorData(i);
+				o=MapElem(linedef,*s);
+				SetSelect(*s,SELECT_SELECTED);
+				ListAppend(selected,s);
+				i=IteratorNext(i);
+				}
+			    break;
+			    }
+			}
+
+		ListClear(new);
+
+		FullRedraw();
+		}
+
+	    break;
+
+	case TM_SWAP_SIDES:
+	    {
+	    int tmp;
+	    Sidedef *tmp_s;
+
+	    i=ListIterator(selected);
+	    GUI_start_yesno_all();
+
+	    while(i)
+		{
+		s=IteratorData(i);
+		l=GETLINE(*s);
+
+		if (l->l.left!=-1)
+		    {
+		    tmp=l->l.left;
+		    tmp_s=l->sl;
+
+		    l->sl=l->sr;
+		    l->l.left=l->l.right;
+
+		    l->sr=tmp_s;
+		    l->l.right=tmp;
+
+		    tmp=l->l.from;
+		    l->l.from=l->l.to;
+		    l->l.to=tmp;
+
+		    l->v[0]=GETVERT(l->l.from);
+		    l->v[1]=GETVERT(l->l.to);
+		    }
+		else if (YesNoAll("Swap one-sided linedefs?"))
+		    {
+		    tmp=l->l.from;
+		    l->l.from=l->l.to;
+		    l->l.to=tmp;
+
+		    l->v[0]=GETVERT(l->l.from);
+		    l->v[1]=GETVERT(l->l.to);
+		    }
+
+		i=IteratorNext(i);
+		}
+
+	    SectorCalcContainingAll();
+	    FullRedraw();
+
+	    break;
+	    }
+
+	case TM_SPLIT_LINE:
+	    {
+	    List new;
+	    int no;
+	    Object *o;
+
+	    new=ListNew(sizeof(int));
+	    i=ListIterator(selected);
+
+	    while(i)
+		{
+		s=IteratorData(i);
+		no=SplitLinedef(*s);
+		ListAppend(new,&no);
+		i=IteratorNext(i);
+		}
+
+	    i=ListIterator(new);
+
+	    while(i)
+	    	{
+		s=IteratorData(i);
+		o=MapElem(linedef,*s);
+		SetSelect(*s,SELECT_SELECTED);
+
+		ListAppend(selected,s);
+		i=IteratorNext(i);
+		}
+
+	    ListClear(new);
+	    SectorCalcContainingAll();
+	    FullRedraw();
+
+	    break;
+	    }
+
+	case TM_TRACK_LINE:
+	    {
+	    List new;
+	    Object *o;
+
+	    i=ListIterator(selected);
+
+	    while(i)
+	    	{
+		s=IteratorData(i);
+		i=IteratorNext(i);
+		}
+
+	    if ((new=TrackLinedef(*s)))
+	    	{
+		ClearSelection();
+		i=ListIterator(new);
+
+		while(i)
+		    {
+		    s=IteratorData(i);
+
+		    o=MapElem(linedef,*s);
+		    SetSelect(*s,SELECT_SELECTED);
+		    ListAppend(selected,s);
+
+		    i=IteratorNext(i);
+		    }
+
+		ListClear(new);
+		new_selection=TRUE;
+		FullRedraw();
+		}
+
+	    break;
+	    }
+
+	case TM_STEPS:
+	    if (ListSize(selected)!=2)
+		GuiInfoBox("ERROR","Just select 2 linedefs|for this function");
+	    else
+	    	{
+		int *l1,*l2;
+
+		i=ListIterator(selected);
+		l1=IteratorData(i);
+		i=IteratorNext(i);
+		l2=IteratorData(i);
+		IteratorClear(i);
+
+		cancel=CreateSteps(*l1,*l2);
+		FullRedraw();
+		}
+
+	    break;
+
+
+	case TM_OFFSET_R:
+	    l=SelHead();
+
+	    offset_dialog[D_OFFSET_OFFX].data.i=l->sr->x;
+	    offset_dialog[D_OFFSET_OFFY].data.i=l->sr->y;
+
+	    if (GUI_dialog("Right offset",D_OFFSET_NO,offset_dialog))
+		{
+		i=ListIterator(selected);
+
+		while(i)
+		    {
+		    s=IteratorData(i);
+		    l=GETLINE(*s);
+		    if (l->sr)
+		    	{
+			l->sr->x=offset_dialog[D_OFFSET_OFFX].data.i;
+			l->sr->y=offset_dialog[D_OFFSET_OFFY].data.i;
+			}
+		    i=IteratorNext(i);
+		    }
+
+		i=IteratorClear(i);
+		FullRedraw();
+		}
+
+	    break;
+
+	case TM_ADJUST_R:
+	    l=SelHead();
+
+	    offset_dialog[D_OFFSET_OFFX].data.i=ax;
+	    offset_dialog[D_OFFSET_OFFY].data.i=ay;
+
+	    if (GUI_dialog("Right offset adjustment",D_OFFSET_NO,offset_dialog))
+		{
+		ax=offset_dialog[D_OFFSET_OFFX].data.i;
+		ay=offset_dialog[D_OFFSET_OFFY].data.i;
+
+		i=ListIterator(selected);
+
+		while(i)
+		    {
+		    s=IteratorData(i);
+		    l=GETLINE(*s);
+		    if (l->sr)
+		    	{
+			l->sr->x+=ax;
+			l->sr->y+=ay;
+			}
+		    i=IteratorNext(i);
+		    }
+
+		i=IteratorClear(i);
+		FullRedraw();
+		}
+
+	    break;
+
+	case TM_SECTOR_R:
+	    l=SelHead();
+
+	    sectorn_dialog[D_SECTORN_SECNO].data.i=l->sr->sector;
+
+	    if (GUI_dialog("Right sector",D_SECTORN_NO,sectorn_dialog))
+		{
+		i=ListIterator(selected);
+
+		while(i)
+		    {
+		    s=IteratorData(i);
+		    l=GETLINE(*s);
+		    if (l->sr)
+			l->sr->sector=sectorn_dialog[D_SECTORN_SECNO].data.i;
+		    i=IteratorNext(i);
+		    }
+
+		i=IteratorClear(i);
+		SectorCalcContainingAll();
+		FullRedraw();
+		}
+
+	    break;
+
+	case TM_UPPER_T_R:
+	    {
+	    DirName d;
+
+	    if ((GetTexture("Upper Right texture",d)))
+	    	{
+		i=ListIterator(selected);
+
+		while(i)
+		    {
+		    s=IteratorData(i);
+		    l=GETLINE(*s);
+		    strcpy(l->sr->upper,d);
+		    i=IteratorNext(i);
+		    }
+
+		FullRedraw();
+		}
+
+	    break;
+	    }
+
+	case TM_MIDDLE_T_R:
+	    {
+	    DirName d;
+
+	    if ((GetTexture("Middle Right texture",d)))
+	    	{
+		i=ListIterator(selected);
+
+		while(i)
+		    {
+		    s=IteratorData(i);
+		    l=GETLINE(*s);
+		    strcpy(l->sr->middle,d);
+		    i=IteratorNext(i);
+		    }
+
+		FullRedraw();
+		}
+
+	    break;
+	    }
+
+	case TM_LOWER_T_R:
+	    {
+	    DirName d;
+
+	    if ((GetTexture("Lower Right texture",d)))
+	    	{
+		i=ListIterator(selected);
+
+		while(i)
+		    {
+		    s=IteratorData(i);
+		    l=GETLINE(*s);
+		    strcpy(l->sr->lower,d);
+		    i=IteratorNext(i);
+		    }
+
+		FullRedraw();
+		}
+
+	    break;
+	    }
+
+	case TM_ALIGN_R:
+	    {
+	    int tw;
+	    int ox;
+
+	    l=SelHead();
+
+	    tw=CalcTextureWidth(l->sr->upper,l->sr->middle,l->sr->lower);
+
+	    if (tw==0)
+		GuiInfoBox("ERROR","First selected linedef has no texture");
+	    else
+	    	{
+		ox=l->sr->x;
+
+		i=ListIterator(selected);
+
+		while(i)
+		    {
+		    s=IteratorData(i);
+
+		    l=GETLINE(*s);
+
+		    l->sr->x=ox;
+
+		    ox=(ox+Len(l->v[0]->v.x,l->v[0]->v.y,
+				    l->v[1]->v.x,l->v[1]->v.y))%tw;
+
+		    i=IteratorNext(i);
+		    }
+
+		FullRedraw();
+		}
+
+	    }
+	    break;
+
+	case TM_TEXTURES_R:
+	    l=SelHead();
+
+	    strcpy(textures_dialog[D_TEXTURE_U].data.s,l->sr->upper);
+	    strcpy(textures_dialog[D_TEXTURE_M].data.s,l->sr->middle);
+	    strcpy(textures_dialog[D_TEXTURE_L].data.s,l->sr->lower);
+
+	    if (GUI_dialog("Right textures",D_TEXTURES_NO,textures_dialog))
+	    	{
+		i=ListIterator(selected);
+
+		while(i)
+		    {
+		    s=IteratorData(i);
+		    l=GETLINE(*s);
+
+		    strcpy(l->sr->upper,textures_dialog[D_TEXTURE_U].data.s);
+		    strcpy(l->sr->middle,textures_dialog[D_TEXTURE_M].data.s);
+		    strcpy(l->sr->lower,textures_dialog[D_TEXTURE_L].data.s);
+
+		    i=IteratorNext(i);
+		    }
+
+		i=IteratorClear(i);
+		FullRedraw();
+		}
+	    break;
+
+
+	case TM_OFFSET_L:
+	    l=SelHead();
+
+	    if (l->sl)
+	    	{
+		offset_dialog[D_OFFSET_OFFX].data.i=l->sl->x;
+		offset_dialog[D_OFFSET_OFFY].data.i=l->sl->y;
+		}
+	    else
+	    	{
+		offset_dialog[D_OFFSET_OFFX].data.i=0;
+		offset_dialog[D_OFFSET_OFFY].data.i=0;
+		}
+
+	    if (GUI_dialog("Left offset",D_OFFSET_NO,offset_dialog))
+		{
+		i=ListIterator(selected);
+
+		while(i)
+		    {
+		    s=IteratorData(i);
+		    l=GETLINE(*s);
+		    if (l->sl)
+		    	{
+			l->sl->x=offset_dialog[D_OFFSET_OFFX].data.i;
+			l->sl->y=offset_dialog[D_OFFSET_OFFY].data.i;
+			}
+		    i=IteratorNext(i);
+		    }
+
+		i=IteratorClear(i);
+		FullRedraw();
+		}
+
+	    break;
+
+	case TM_ADJUST_L:
+	    l=SelHead();
+
+	    offset_dialog[D_OFFSET_OFFX].data.i=ax;
+	    offset_dialog[D_OFFSET_OFFY].data.i=ay;
+
+	    if (GUI_dialog("Left offset adjustment",D_OFFSET_NO,offset_dialog))
+		{
+		ax=offset_dialog[D_OFFSET_OFFX].data.i;
+		ay=offset_dialog[D_OFFSET_OFFY].data.i;
+
+		i=ListIterator(selected);
+
+		while(i)
+		    {
+		    s=IteratorData(i);
+		    l=GETLINE(*s);
+		    if (l->sl)
+		    	{
+			l->sl->x+=ax;
+			l->sl->y+=ay;
+			}
+		    i=IteratorNext(i);
+		    }
+
+		i=IteratorClear(i);
+		FullRedraw();
+		}
+
+	    break;
+
+	case TM_SECTOR_L:
+	    l=SelHead();
+
+	    if (l->sl)
+		sectorn_dialog[D_SECTORN_SECNO].data.i=l->sl->sector;
+	    else
+		sectorn_dialog[D_SECTORN_SECNO].data.i=-1;
+
+	    if (GUI_dialog("Left sector",D_SECTORN_NO,sectorn_dialog))
+		{
+		i=ListIterator(selected);
+
+		while(i)
+		    {
+		    s=IteratorData(i);
+		    l=GETLINE(*s);
+		    if (l->sl)
+			l->sl->sector=sectorn_dialog[D_SECTORN_SECNO].data.i;
+		    i=IteratorNext(i);
+		    }
+
+		i=IteratorClear(i);
+		SectorCalcContainingAll();
+		FullRedraw();
+		}
+
+	    break;
+
+	case TM_UPPER_T_L:
+	    {
+	    DirName d;
+
+	    if ((GetTexture("Upper Left texture",d)))
+	    	{
+		i=ListIterator(selected);
+
+		while(i)
+		    {
+		    s=IteratorData(i);
+		    l=GETLINE(*s);
+		    if (l->sl)
+			strcpy(l->sl->upper,d);
+		    i=IteratorNext(i);
+		    }
+
+		FullRedraw();
+		}
+
+	    break;
+	    }
+
+	case TM_MIDDLE_T_L:
+	    {
+	    DirName d;
+
+	    if ((GetTexture("Middle Left texture",d)))
+	    	{
+		i=ListIterator(selected);
+
+		while(i)
+		    {
+		    s=IteratorData(i);
+		    l=GETLINE(*s);
+		    if (l->sl)
+			strcpy(l->sl->middle,d);
+		    i=IteratorNext(i);
+		    }
+
+		FullRedraw();
+		}
+
+	    break;
+	    }
+
+	case TM_LOWER_T_L:
+	    {
+	    DirName d;
+
+	    if ((GetTexture("Lower Left texture",d)))
+	    	{
+		i=ListIterator(selected);
+
+		while(i)
+		    {
+		    s=IteratorData(i);
+		    l=GETLINE(*s);
+		    if (l->sl)
+			strcpy(l->sl->lower,d);
+		    i=IteratorNext(i);
+		    }
+
+		FullRedraw();
+		}
+
+	    break;
+	    }
+
+	case TM_ALIGN_L:
+	    {
+	    int tw;
+	    int ox;
+	    int ok;
+
+	    ok=TRUE;
+
+	    i=ListIterator(selected);
+
+	    while(i)
+		{
+		s=IteratorData(i);
+		l=GETLINE(*s);
+
+		if (!(l->sl))
+		    ok=FALSE;
+
+		i=IteratorNext(i);
+		}
+
+	    if (!ok)
+		GuiInfoBox("ERROR","Some linedefs with no left sidedef");
+	    else
+	    	{
+		l=SelHead();
+
+		tw=CalcTextureWidth(l->sl->upper,l->sl->middle,l->sl->lower);
+
+		if (tw==0)
+		    GuiInfoBox("ERROR","First selected linedef has no texture");
+		else
+		    {
+		    ox=l->sl->x;
+
+		    i=ListIterator(selected);
+
+		    while(i)
+			{
+			s=IteratorData(i);
+
+			l=GETLINE(*s);
+
+			l->sl->x=ox;
+
+			ox=(ox+Len(l->v[0]->v.x,l->v[0]->v.y,
+					l->v[1]->v.x,l->v[1]->v.y))%tw;
+
+			i=IteratorNext(i);
+			}
+
+		    FullRedraw();
+		    }
+		}
+
+	    }
+	    break;
+
+	case TM_TEXTURES_L:
+	    l=SelHead();
+
+	    if (l->sl)
+	    	{
+		strcpy(textures_dialog[D_TEXTURE_U].data.s,l->sl->upper);
+		strcpy(textures_dialog[D_TEXTURE_M].data.s,l->sl->middle);
+		strcpy(textures_dialog[D_TEXTURE_L].data.s,l->sl->lower);
+		}
+	    else
+	    	{
+		strcpy(textures_dialog[D_TEXTURE_U].data.s,"");
+		strcpy(textures_dialog[D_TEXTURE_M].data.s,"");
+		strcpy(textures_dialog[D_TEXTURE_L].data.s,"");
+		}
+
+	    if (GUI_dialog("Left textures",D_TEXTURES_NO,textures_dialog))
+	    	{
+		i=ListIterator(selected);
+
+		while(i)
+		    {
+		    s=IteratorData(i);
+		    l=GETLINE(*s);
+
+		    if (l->sl)
+		    	{
+			strcpy(l->sl->upper,
+			       textures_dialog[D_TEXTURE_U].data.s);
+			strcpy(l->sl->middle,
+			       textures_dialog[D_TEXTURE_M].data.s);
+			strcpy(l->sl->lower,
+			       textures_dialog[D_TEXTURE_L].data.s);
+			}
+
+		    i=IteratorNext(i);
+		    }
+
+		i=IteratorClear(i);
+		FullRedraw();
+		}
+	    break;
+
+
+	case TM_TAG:
+	    l=SelHead();
+	    tag_dialog[D_TAG].data.i=l->l.tag;
+
+	    if (GUI_dialog("Tag",D_TAG_NO,tag_dialog))
+		{
+		SetTagObject_LINEDEF(tag_dialog[D_TAG].data.i);
+		FullRedraw();
+		}
+
+	    break;
+
+	case TM_DELETE:
+	    ObjectDelete_LINEDEF();
+	    break;
+
+	case TM_MOVE:
+	    MoveObject_LINEDEF();
+	    break;
+
+	case TM_ARGS:
+	    {
+	    int a[5];
+	    int id;
+	    int diff;
+
+	    l=SelHead();
+
+	    id=l->l.type;
+
+	    i=ListIterator(selected);
+	    i=IteratorNext(i);
+	    diff=FALSE;
+
+	    while((i)&&(!diff))
+		{
+		s=IteratorData(i);
+		l=GETLINE(*s);
+
+		if (l->l.type!=id)
+		    diff=TRUE;
+
+		i=IteratorNext(i);
+		}
+
+	    if ((diff)&&(YesNo("Selected linedefs have|different types| |"
+							"Set individually?")))
+		{
+		cancel=TRUE;
+
+		i=ListIterator(selected);
+
+		while(i)
+		    {
+		    s=IteratorData(i);
+		    l=GETLINE(*s);
+		    id=l->l.type;
+
+		    for(f=0;f<5;f++)
+			a[f]=l->l.args[f];
+
+		    if (SpecialArgDialog(NULL,id,a))
+			{
+			for(f=0;f<5;f++)
+			    l->l.args[f]=a[f];
+
+			SetHexenLinedefTag(l);
+
+			cancel=FALSE;
+			}
+
+		    i=IteratorNext(i);
+		    }
+		}
+	    else
+	    	{
+		l=SelHead();
+
+		for(f=0;f<5;f++)
+		    a[f]=l->l.args[f];
+
+		if (SpecialArgDialog(NULL,id,a))
+		    {
+		    i=ListIterator(selected);
+
+		    while(i)
+			{
+			s=IteratorData(i);
+			l=GETLINE(*s);
+
+			for(f=0;f<5;f++)
+			    l->l.args[f]=a[f];
+
+			SetHexenLinedefTag(l);
+
+			i=IteratorNext(i);
+			}
+		    }
+		else
+		    cancel=TRUE;
+		}
+
+	    FullRedraw();
+	    break;
+	    }
+
+	case TM_ZERO:
+	    i=ListIterator(selected);
+
+	    while(i)
+		{
+		s=IteratorData(i);
+		l=GETLINE(*s);
+		
+		for(f=0;f<5;f++)
+		    l->l.args[f]=0;
+
+		l->l.tag=0;
+
+		i=IteratorNext(i);
+		}
+
+	    FullRedraw();
+	    break;
+
+	case TM_ARGS_RANGE:
+	    {
+	    int a[5];
+	    int d[5];
+	    int id;
+	    int diff;
+
+	    l=SelHead();
+
+	    id=l->l.type;
+
+	    i=ListIterator(selected);
+	    i=IteratorNext(i);
+	    diff=FALSE;
+
+	    while(i)
+		{
+		s=IteratorData(i);
+		l=GETLINE(*s);
+
+		if (l->l.type!=id)
+		    {
+		    diff=TRUE;
+		    i=IteratorClear(i);
+		    }
+		else
+		    i=IteratorNext(i);
+		}
+
+	    l=SelHead();
+
+	    for(f=0;f<5;f++)
+	    	{
+		a[f]=l->l.args[f];
+		d[f]=0;
+		}
+
+	    if ((!diff)||(YesNo("Selected linedefs have|different types| |"
+							"Continue?")))
+		if ((SpecialArgDialog("Start values",id,a))&&
+				(SpecialArgDialog("Increments",id,d)))
+
+		    {
+		    i=ListIterator(selected);
+
+		    while(i)
+			{
+			s=IteratorData(i);
+			l=GETLINE(*s);
+
+			for(f=0;f<5;f++)
+			    {
+			    l->l.args[f]=(Byte)a[f];
+			    a[f]+=d[f];
+			    }
+
+			SetHexenLinedefTag(l);
+
+			i=IteratorNext(i);
+			}
+
+		    FullRedraw();
+		    }
+	    break;
+	    }
+
+	default:
+	    cancel=TRUE;
+	    break;
+	}
+
+    if ((!cancel)&&(!new_selection)&&(clear_on_menu))
+    	{
+	ClearSelection();
+	FullRedraw();
+	}
+}
+
+
+void ObjectKey_LINEDEF(GFXKey k)
+{
+    char s[128];
+    EditLine *l;
+    int f;
+    int change;
+    List li;
+    Iterator i;
+    EditSect *sr,*sl;
+    DirName d;
+    Object *o;
+    int apply;
+
+    VIDOOM_TRACE;
+
+    switch(k.code)
+	{
+	case GFX_F12:
+	    li=ListNew(sizeof(int));
+
+	    change=FALSE;
+
+	    if (ListSize(selected)==0)
+	    	{
+		GuiInfoBox("ERROR","No linedefs selected");
+		return;
+		}
+
+	    i=ListIterator(selected);
+
+	    GUI_start_yesno_all();
+
+	    while(i)
+	    	{
+		memcpy(&f,IteratorData(i),sizeof(f));
+
+		if ((l=GETLINE(f)))
+		    {
+		    VIDOOM_TRACE;
+		    if (check_1side_lower)
+			if ((!l->sl)&&(strcmp(l->sr->lower,empty_texture)))
+			    if ((check_line_assume_yes)||
+				    (YesNoAll
+				    	("LINEDEF %d is one-sided with a "
+			    			"lower texture.  Remove?",f)))
+				{
+				strcpy(l->sr->lower,empty_texture);
+				change=TRUE;
+				IntListUniqAdd(li,f);
+				}
+
+		    VIDOOM_TRACE;
+		    if (check_1side_middle)
+			if ((!l->sl)&&(!strcmp(l->sr->middle,empty_texture)))
+			    if ((check_line_assume_yes)||
+				    (YesNoAll
+					("LINEDEF %d is one-sided with no "
+			    			"middle texture.  Add?",f)))
+				{
+				sprintf(s,"Pick MIDDLE texture "
+							"for LINEDEF %d",f);
+
+				if (strcmp(linedef_check_default,empty_texture))
+				    {
+				    apply=TRUE;
+				    strcpy(d,linedef_check_default);
+				    }
+				else
+				    apply=GetTexture(s,d);
+
+				if (apply)
+				    {
+				    strcpy(l->sr->middle,d);
+				    change=TRUE;
+				    IntListUniqAdd(li,f);
+				    }
+				}
+
+		    VIDOOM_TRACE;
+		    if (check_1side_upper)
+			if ((!l->sl)&&(strcmp(l->sr->upper,empty_texture)))
+			    if ((check_line_assume_yes)||
+				    (YesNoAll
+				    	("LINEDEF %d is one-sided with a "
+			    			"upper texture.  Remove?",f)))
+				{
+				strcpy(l->sr->upper,empty_texture);
+				change=TRUE;
+				IntListUniqAdd(li,f);
+				}
+
+		    VIDOOM_TRACE;
+		    if ((check_2side_lower)&&(l->sl)&&(l->sl->sector!=-1)&&
+		    			(l->sr->sector!=-1))
+			{
+			sr=GETSECT(l->sr->sector);
+			sl=GETSECT(l->sl->sector);
+
+			if ((sr->s.floor<sl->s.floor)&&
+				    (!strcmp(l->sr->lower,empty_texture)))
+			    if ((check_line_assume_yes)||
+				    (YesNoAll
+					("LINEDEF %d is two-sided with no "
+						"lower texture.  Add?",f)))
+				{
+				sprintf(s,"Pick LOWER texture "
+							"for LINEDEF %d",f);
+
+				if (strcmp(linedef_check_default,empty_texture))
+				    {
+				    apply=TRUE;
+				    strcpy(d,linedef_check_default);
+				    }
+				else
+				    apply=GetTexture(s,d);
+
+				if (apply)
+				    {
+				    strcpy(l->sr->lower,d);
+				    strcpy(l->sl->lower,empty_texture);
+				    change=TRUE;
+				    IntListUniqAdd(li,f);
+				    }
+				}
+
+			if ((sr->s.floor>sl->s.floor)&&
+				    (!strcmp(l->sl->lower,empty_texture)))
+			    if ((check_line_assume_yes)||
+				    (YesNoAll
+				    	("LINEDEF %d is two-sided with no "
+						"lower texture.  Add?",f)))
+				{
+				sprintf(s,"Pick LOWER texture "
+							"for LINEDEF %d",f);
+
+				if (strcmp(linedef_check_default,empty_texture))
+				    {
+				    apply=TRUE;
+				    strcpy(d,linedef_check_default);
+				    }
+				else
+				    apply=GetTexture(s,d);
+
+				if (apply)
+				    {
+				    strcpy(l->sl->lower,d);
+				    strcpy(l->sr->lower,empty_texture);
+				    change=TRUE;
+				    IntListUniqAdd(li,f);
+				    }
+				}
+
+			if ((sr->s.floor==sl->s.floor)&&
+				((strcmp(l->sl->lower,empty_texture))||
+				 (strcmp(l->sr->lower,empty_texture))))
+			    if ((check_line_assume_yes)||
+				    (YesNoAll
+				    	("LINEDEF %d is two-sided with "
+					"pointless lower texture.  Remove?",f)))
+				{
+				strcpy(l->sl->lower,empty_texture);
+				strcpy(l->sr->lower,empty_texture);
+				change=TRUE;
+				IntListUniqAdd(li,f);
+				}
+			}
+
+		    VIDOOM_TRACE;
+		    if ((check_2side_middle)&&(l->sl)&&(l->sl->sector!=-1))
+		    	{
+			if (((strcmp(l->sr->middle,empty_texture))||
+				(strcmp(l->sl->middle,empty_texture)))&&
+				    (l->sl->sector!=l->sr->sector))
+			    if ((check_line_assume_yes)||
+				    (YesNoAll
+				    	("LINEDEF %d is two-sided with a "
+			    			"middle texture.  Remove?",f)))
+				{
+				strcpy(l->sr->middle,empty_texture);
+				strcpy(l->sl->middle,empty_texture);
+				change=TRUE;
+				IntListUniqAdd(li,f);
+				}
+			}
+
+		    VIDOOM_TRACE;
+		    if ((check_2side_upper)&&(l->sl)&&(l->sl->sector!=-1)&&
+		    			(l->sr->sector!=-1))
+			{
+			sr=GETSECT(l->sr->sector);
+			sl=GETSECT(l->sl->sector);
+
+			if ((sr->s.ceiling>sl->s.ceiling)&&
+				    (!strcmp(l->sr->upper,empty_texture)))
+			    if ((check_line_assume_yes)||
+				    (YesNoAll
+				    	("LINEDEF %d is two-sided with no "
+						"upper texture.  Add?",f)))
+				{
+				sprintf(s,"Pick UPPER texture "
+							"for LINEDEF %d",f);
+
+				if (strcmp(linedef_check_default,empty_texture))
+				    {
+				    apply=TRUE;
+				    strcpy(d,linedef_check_default);
+				    }
+				else
+				    apply=GetTexture(s,d);
+
+				if (apply)
+				    {
+				    strcpy(l->sr->upper,d);
+				    strcpy(l->sl->upper,empty_texture);
+				    change=TRUE;
+				    IntListUniqAdd(li,f);
+				    }
+				}
+
+			if ((sr->s.ceiling<sl->s.ceiling)&&
+				    (!strcmp(l->sl->upper,empty_texture)))
+			    if ((check_line_assume_yes)||
+				    (YesNoAll
+				    	("LINEDEF %d is two-sided with no "
+						"upper texture.  Add?",f)))
+				{
+				sprintf(s,"Pick UPPER texture "
+							"for LINEDEF %d",f);
+
+				if (strcmp(linedef_check_default,empty_texture))
+				    {
+				    apply=TRUE;
+				    strcpy(d,linedef_check_default);
+				    }
+				else
+				    apply=GetTexture(s,d);
+
+				if (apply)
+				    {
+				    strcpy(l->sl->upper,d);
+				    strcpy(l->sr->upper,empty_texture);
+				    change=TRUE;
+				    IntListUniqAdd(li,f);
+				    }
+				}
+
+			if ((sr->s.ceiling==sl->s.ceiling)&&
+				((strcmp(l->sl->upper,empty_texture))||
+				 (strcmp(l->sr->upper,empty_texture))))
+			    if ((check_line_assume_yes)||
+				    (YesNoAll
+				    	("LINEDEF %d is two-sided with "
+					"pointless upper texture.  Remove?",f)))
+				{
+				strcpy(l->sl->upper,empty_texture);
+				strcpy(l->sr->upper,empty_texture);
+				change=TRUE;
+				IntListUniqAdd(li,f);
+				}
+			}
+
+		    VIDOOM_TRACE;
+		    if ((check_2side_same_sector)&&(l->sl)&&(l->sl->sector!=-1))
+		    	{
+			if ((l->sl->sector==l->sr->sector)&&
+			    ((strcmp(l->sr->lower,empty_texture))||
+			     (strcmp(l->sr->middle,empty_texture))||
+			     (strcmp(l->sr->upper,empty_texture))||
+			     (strcmp(l->sl->lower,empty_texture))||
+			     (strcmp(l->sl->middle,empty_texture))||
+			     (strcmp(l->sl->upper,empty_texture))))
+			    if ((check_line_assume_yes)||
+				    (YesNoAll
+				    	("LINEDEF %d is two-sided within a "
+					    "sector and is textured.  "
+					    		"Remove all?",f)))
+				{
+				strcpy(l->sr->lower,empty_texture);
+				strcpy(l->sl->lower,empty_texture);
+				strcpy(l->sr->middle,empty_texture);
+				strcpy(l->sl->middle,empty_texture);
+				strcpy(l->sr->upper,empty_texture);
+				strcpy(l->sl->upper,empty_texture);
+				change=TRUE;
+				IntListUniqAdd(li,f);
+				}
+			}
+
+		    }
+
+		i=IteratorNext(i);
+		}
+
+	    if (change)
+	    	{
+		if (YesNo("Select altered LINEDEFs?"))
+		    {
+		    ClearSelection();
+		    i=ListIterator(li);
+
+		    while(i)
+			{
+			memcpy(&f,IteratorData(i),sizeof(int));
+			o=MapElem(linedef,f);
+			SetSelect(f,SELECT_SELECTED);
+			ListAppend(selected,&f);
+			i=IteratorNext(i);
+			}
+
+		    FullRedraw();
+		    }
+		}
+	    else
+		GuiInfoBox("NOTICE","No problems found");
+
+	    ListClear(li);
+	    break;
+
+	default:
+
+	    case GFX_ASCII:
+		switch(toupper(k.ascii))
+		    {
+		    case 'H':
+			tag_highlight=!tag_highlight;
+			FullRedraw();
+			break;
+
+		    default:
+			break;
+		    }
+	    break;
+	}
+}
+
+
+int ObjectHasTag_LINEDEF(void *obj, int tag)
+{
+    EditLine *l;
+
+    return ((l=obj)&&(l->l.tag==tag));
+}
+
+
+ObjDesc *ObjectOverlaid_LINEDEF(int x, int y, int *no)
+{
+    int n;
+    EditLine *l;
+    ObjDesc *od;
+    int f;
+
+    VIDOOM_TRACE;
+
+    od=NULL;
+
+    n=0;
+
+    for(f=0;f<MapSize(linedef);f++)
+    	{
+	l=GETLINE(f);
+
+	if ((l)&&(PositionOnObject_LINEDEF(x,y,l)))
+	    {
+	    n++;
+	    od=ReGrab(od,sizeof(ObjDesc)*n);
+	    od[n-1].no=f;
+
+	    sprintf(od[n-1].detail,"%5d - %s (Tag %d)",f,
+					    TrimStr(LinedefName(l->l.type),60),
+					    l->l.tag);
+	    }
+	}
+
+    *no=n;
+    return(od);
+}
+
+
+/* END OF FILE */