New upstream version 5.1.0upstream/5.1.0

1 files changed, 1153 insertions, 0 deletions

diff --git a/app/bin/cbezier.c b/app/bin/cbezier.c
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+/** \file cbezier.c
+ * Bezier Command. Draw or modify a Bezier (Track or Line).
+ */
+ /*  XTrkCad - Model Railroad CAD
+ *
+ * Cubic Bezier curves have a definitional representation as an a set of four points.
+ * The first and fourth are the end points, while the middle two are control points.
+ * The control points positions define the angle at the ends and by their relative positions the overall
+ * curvature. This representation is a familiar approach for those who know drawing programs such as Adobe
+ * Illustrator or CorelDraw.
+ *
+ * In XTrackCAD, the Bezier form is also represented and drawn as a set of
+ * joined circular arcs that approximate the Bezier form within a small tolerance. This is because
+ * many of the operations we need to do are either computationally difficult or
+ * impossible using the Bezier equations. For example, creating a parallel Bezier
+ * which is necessary to draw a track with two lines or sleepers has no easy, stable solution.
+ * But the program is already able to do these tasks for straight lines and curves.
+ *
+ * Note that every time we change the Bezier points we have to recalculate the arc approximation,
+ * but that means that the majority of the time we are using the simpler approximation.
+ *
+ * We do not allow Bezier curves that have loops or cusps as they make no sense for tracks and
+ * can easily be approximated for lines with multiple unaligned Bezier curves.
+ *
+ * This program borrows from particular ideas about converting Bezier curves that Pomax placed into
+ * open source. The originals in Javascript can be found at github.com/Pomax.
+ * The web pages that explain many other techniques are located at https://pomax.github.io/bezierinfo
+ *
+ *  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.
+ */
+
+
+#include "track.h"
+#include "draw.h"
+#include "ccurve.h"
+#include "cbezier.h"
+#include "tbezier.h"
+#include "cstraigh.h"
+#include "drawgeom.h"
+#include "cjoin.h"
+#include "i18n.h"
+#include "common.h"
+#include "wcolors.h"
+#include "math.h"
+#include "utility.h"
+#include "param.h"
+#include "fileio.h"
+#include "layout.h"
+#include "cundo.h"
+
+extern drawCmd_t tempD;
+
+
+/*
+ * STATE INFO
+ */
+enum Bezier_States { NONE,
+	POS_1,
+	CONTROL_ARM_1,
+	POS_2,
+	CONTROL_ARM_2,
+	PICK_POINT,
+	POINT_PICKED,
+	TRACK_SELECTED };
+
+typedef struct {
+		curveData_t curveData;
+		double start;
+		double end;
+		coOrd pos0;
+		coOrd pos1;
+		} bCurveData_t;
+
+static struct {
+		enum Bezier_States state;
+		coOrd pos[4];
+        int selectPoint;
+        wDrawColor color;
+        DIST_T width;
+		track_p trk[2];
+		EPINX_T ep[2];
+		dynArr_t crvSegs_da;
+		int crvSegs_da_cnt;
+		trkSeg_t cp1Segs_da[4];
+		int cp1Segs_da_cnt;
+		trkSeg_t cp2Segs_da[4];
+		int cp2Segs_da_cnt;
+		BOOL_T unlocked;
+		track_p selectTrack;
+		BOOL_T track;
+		DIST_T minRadius;
+		} Da;
+
+
+
+/**
+ * Draw a ControlArm.
+ * A control arm has two filled or unfilled circles for endpoints and a straight line between them.
+ * If the end or control point is not selectable we don't mark it with a circle.
+ * If a selectable end or control point is unlocked place a filled circle on it, otherwise an empty circle.
+ * A red color indicates that this arm, end or control point is "active" as it was selected.
+ */
+int createControlArm(
+                     trkSeg_t sp[],   //seg pointer for up to 3 trkSegs (ends and line)
+                     coOrd pos0,     //end on curve
+                     coOrd pos1,     // control point at other end of line
+				     BOOL_T track,   // isTrack()? (otherwise Line)
+				     BOOL_T selectable, 	// can this arm be selected?
+                     BOOL_T cp_direction_locked, //isFixed to track
+				     int point_selected, //number of point 0, 1 or -1
+					 wDrawColor color   //drawColorBlack or drawColorWhite
+                      )
+{
+    DIST_T d, w;
+    d = tempD.scale*0.25;
+    w = tempD.scale/tempD.dpi; /*double width*/
+    sp[0].u.l.pos[0] = pos0;
+    sp[0].u.l.pos[1] = pos1;
+    sp[0].type = SEG_STRLIN;
+    sp[0].width = w;
+    sp[0].color = (point_selected>=0)?drawColorRed:drawColorBlack;
+    int n = 0;
+    if (selectable) {
+    	for (int j=0;j<2;j++) {
+    		if (j==0 && cp_direction_locked) continue;   //Don't show select circle if end locked
+    		n++;
+    		sp[n].u.c.center = j==0?pos0:pos1;
+    		sp[n].u.c.radius = d/4;
+    		sp[n].width = w;
+    		sp[n].color = (j==point_selected)?drawColorRed:drawColorBlack;
+    		if (j==point_selected && cp_direction_locked) {
+    			sp[n].type = SEG_FILCRCL;
+    		} else {
+    			sp[n].type = SEG_CRVLIN;
+    			sp[n].u.c.a0 = 0.0;
+    			sp[n].u.c.a1 = 360.0;
+    		}
+    	}
+    }
+    return n+1;
+}
+
+coOrd getPoint(coOrd pos[4], double s) {
+	double mt = 1-s;
+	double a = mt*mt*mt;
+	double b = mt*mt*s*3;
+	double c = mt*s*s*3;
+	double d = s*s*s;
+	coOrd ret;
+	ret.x = a*pos[0].x + b*pos[1].x + c*pos[2].x + d*pos[3].x;
+	ret.y = a*pos[0].y + b*pos[1].y + c*pos[2].y + d*pos[3].y;
+	return ret;
+}
+/*
+ * Get Error between a Bezier and an arc centered at pc that goes from start to end
+ *
+ * Because the curve is defined to pass through the start and the end and the middle, the test is
+ * to see how much of an error there is between those points. If the sum of the errors is off by more \
+ * than 0.5 pixels - that will mean it is not a good fit.
+ *
+ */
+double BezError(coOrd pos[4], coOrd center, coOrd start_point, double start, double end) {
+	double quarter = (end - start) / 4;  // take point at 1/4 and 3/4 and check
+	coOrd c1 = getPoint(pos, start + quarter);
+	coOrd c2 = getPoint(pos, end - quarter);
+	double ref = FindDistance(center, start_point); //radius
+	double d1  = FindDistance(center, c1);          // distance to quarter
+	double d2  = FindDistance(center, c2);          // distance to three quarters
+	return fabs(d1-ref) + fabs(d2-ref);               //total error at quarter points
+};
+
+/*
+ * Get distance between a point and a line segment
+ */
+
+double DistanceToLineSegment(coOrd p, coOrd l1, coOrd l2) {
+	double A = p.x - l1.x;
+    double B = p.y - l1.y;
+    double C = l2.x - l1.x;
+    double D = l2.y - l1.y;
+
+    double dot = A * C + B * D;
+    double len_sq = C * C + D * D;
+    double param = -1;
+    if (len_sq != 0) //non 0 length line
+    	param = dot / len_sq;
+
+    double xx, yy;
+
+    if (param < 0) {      // zero length line or beyond end use point 1
+    	xx = l1.x;
+    	yy = l1.y;
+    }  else if (param > 1) {  // beyond point 2 end of line segment
+    	xx = l2.x;
+    	yy = l2.y;
+    }  else {					// In the middle
+    	xx = l1.x + param * C;
+    	yy = l1.y + param * D;
+    }
+
+    double dx = p.x - xx;        //distance to perpendicular (or end point)
+    double dy = p.y - yy;
+    return sqrt(dx * dx + dy * dy);
+}
+
+/*
+ * Get Error between a straight line segment and the Bezier curve.
+ * Sum distance to straight line of quarter points.
+ */
+
+double BezErrorLine(coOrd pos[4], coOrd start_point, coOrd end_point, double start, double end) {
+	double quarter = (end - start) / 4;  // take point at 1/4 and 3/4 and check
+	coOrd c1 = getPoint(pos, start + quarter);
+	coOrd c2 = getPoint(pos, end - quarter);
+	double d1 = DistanceToLineSegment(c1, start_point, end_point);
+	double d2 = DistanceToLineSegment(c2, start_point, end_point);
+	return fabs(d1)+fabs(d2);
+}
+
+/*
+ * Add element to DYNARR pointed to by caller from segment handed in
+ */
+void addSegBezier(dynArr_t * const array_p, trkSeg_p seg) {
+	trkSeg_p s;
+
+
+	DYNARR_APPEND(trkSeg_t, * array_p, 1);          //Adds 1 to cnt
+	s = &DYNARR_N(trkSeg_t,* array_p,array_p->cnt-1);
+	s->type = seg->type;
+	s->color = seg->color;
+	s->width = seg->width;
+	s->bezSegs.cnt = 0;
+	if (s->bezSegs.ptr) MyFree(s->bezSegs.ptr);
+	s->bezSegs.ptr=NULL;
+	s->bezSegs.max = 0;
+	if ((s->type == SEG_BEZLIN || s->type == SEG_BEZTRK) && seg->bezSegs.cnt) {
+		s->u.b.angle0 = seg->u.b.angle0;  //Copy all the rest
+		s->u.b.angle3 = seg->u.b.angle3;
+		s->u.b.length = seg->u.b.length;
+		s->u.b.minRadius = seg->u.b.minRadius;
+		for (int i=0;i<4;i++) s->u.b.pos[i] = seg->u.b.pos[i];
+		s->u.b.radius0 = seg->u.b.radius3;
+		s->bezSegs.cnt = 0;
+		if (s->bezSegs.ptr) MyFree(s->bezSegs.ptr);
+		s->bezSegs.max = 0;
+		s->bezSegs.ptr = NULL; //Make sure new space as addr copied in earlier from seg
+		for (int i = 0; i<seg->bezSegs.cnt; i++) {
+			addSegBezier(&s->bezSegs,(((trkSeg_p)seg->bezSegs.ptr)+i)); //recurse for copying embedded Beziers as in Cornu joint
+		}
+	} else {
+		s->u = seg->u;
+	}
+}
+
+enum BezierType {PLAIN, LOOP, CUSP, INFLECTION, DOUBLEINFLECTION, LINE, ENDS, COINCIDENT } bType;
+
+/*
+ * Analyse Bezier.
+ *
+ * Using results from Maureen C. Stone of XeroxParc and Tony deRose of U of Washington
+ * characterise the curve type and find out what features it has.
+ * We will eliminate cusps and loops as not useful forms. Line, Plain, Inflection and DoubleInflection are ok.
+ *
+ */
+EXPORT enum BezierType AnalyseCurve(coOrd inpos[4], double *Rfx, double *Rfy, double *cusp) {
+
+	*Rfx = *Rfy = 0;
+	if (Da.track && inpos[0].x == inpos[3].x && inpos[0].y == inpos[3].y ) {
+		return ENDS;
+	}
+
+	DIST_T d01 = FindDistance(inpos[0],inpos[1]);
+	DIST_T d12 = FindDistance(inpos[1],inpos[2]);
+	DIST_T d02 = FindDistance(inpos[0],inpos[2]);
+	if (d01+d12 == d02) {								//straight
+		DIST_T d23 = FindDistance(inpos[2],inpos[3]);
+		DIST_T d03 = FindDistance(inpos[0],inpos[3]);
+		if (d02+d23 == d03) return LINE;
+	}
+	int common_points = 0;
+	for (int i=0;i<3;i++) {
+		if (inpos[i].x == inpos[i+1].x && inpos[i].y == inpos[i+1].y) common_points++;
+	}
+	for (int i=0;i<2;i++) {
+		if (inpos[i].x == inpos[i+2].x && inpos[i].y == inpos[i+2].y) common_points++;
+	}
+
+	if (common_points>2) {
+		return COINCIDENT;
+	}
+
+	coOrd pos[4];
+	coOrd offset2, offset = inpos[0];
+
+	for (int i=0;i<4;i++) {     				//move to zero origin
+		pos[i].x = inpos[i].x-offset.x;
+		pos[i].y = inpos[i].y-offset.y;
+	}
+
+	offset2.x = -offset.x + pos[3].x;
+	offset2.y = -offset.y + pos[3].y;
+	if (pos[1].y == 0.0) {   					//flip order of points
+		for (int i=0;i<4;i++) {
+			coOrd temp_pos = pos[i];
+			pos[i].x = pos[3-i].x - offset2.x;
+			pos[i].y = pos[3-i].y - offset2.y;
+			pos[3-i] = temp_pos;
+		}
+		if (pos[1].y == 0.0) {					//Both ways round the second point has no y left after translation
+			return PLAIN;
+		}
+	}
+	double f21 = (pos[2].y)/(pos[1].y);
+	double f31 = (pos[3].y)/(pos[1].y);
+	if (fabs(pos[2].x-(pos[1].x*f21)) <0.0001) return PLAIN;   //defend against divide by zero
+	double fx = (pos[3].x-(pos[1].x*f31))/(pos[2].x-(pos[1].x*f21));
+	double fy = f31+(1-f21)*fx;
+	*Rfx = fx;
+	*Rfy = fy;
+	*cusp = fabs(fy - (-(fx*fx)+2*fx+3)/4);
+
+	if (fy > 1.0) return INFLECTION;
+	if (fx >= 1.0) return PLAIN;
+	if (fabs(fy - (-(fx*fx)+2*fx+3)/4) <0.100) return CUSP;
+	if (fy < (-(fx*fx)+2*fx+3)/4) {
+		if (fx <= 0.0 && fy >= (3*fx-(fx*fx))/3) return LOOP;
+		if (fx > 0.0 && fy >= (sqrt(3*(4*fx-fx*fx))-fx)/2) return LOOP;
+		return PLAIN;
+	}
+
+	return DOUBLEINFLECTION;
+}
+
+/*
+ * ConvertToArcs
+ * Take a Bezier curve and turn it into a set of circular arcs, such that the error between the arc and the
+ * Bezier is under 0.5 pixels at maxiumum zoom.
+ *
+ * This enables us to use normal methods (operating over the array of arcs)
+ * to perform actions on the Bezier and also to export it to DXF.
+ *
+ */
+EXPORT BOOL_T ConvertToArcs (coOrd pos[4], dynArr_t * segs, BOOL_T track, wDrawColor color, DIST_T width) {
+	 double t_s = 0.0, t_e = 1.0;
+	 double errorThreshold = 0.05;
+	 bCurveData_t prev_arc;
+	 prev_arc.end = 0.0;
+	 bCurveData_t arc;
+	 segs->cnt = 0; //wipe out
+	 BOOL_T safety;
+	 int col = 0;
+
+	 double prev_e = 0.0;
+	      // we do a binary search to find the "good `t` closest to no-longer-good"
+	 do {
+	     safety=FALSE;
+	     // step 1: start with the maximum possible arc length
+	      t_e = 1.0;
+	     // points:
+	     coOrd start_point, mid_point, end_point;
+	     // booleans:
+	     BOOL_T curr_good = FALSE, prev_good = FALSE, done = FALSE;
+	      // numbers:
+	      double t_m, step = 0;
+	      // step 2: find the best possible arc
+	      do {						// !done
+	          prev_good = curr_good;   //remember last time
+	          t_m = (t_s + t_e)/2;
+	          step++;
+	          start_point = getPoint(pos, t_s); //Start of arc
+	          mid_point = getPoint(pos, t_m);  //Middle of trial arc
+	          end_point = getPoint(pos, t_e);  //End of trial Arc
+
+	          PlotCurve( crvCmdFromChord, start_point, end_point, mid_point,
+	        		  	  &(arc.curveData), TRUE );  //Find Arc through three points
+
+	          arc.start = t_s; 		//remember start
+	          arc.end = t_e;			//remember end
+	          arc.pos0 = start_point; //remember start point (used for Straight)
+	          arc.pos1 = end_point;	// Remember end point (used for Straight)
+
+	          if (arc.curveData.type == curveTypeStraight) {
+	          	  double error = BezErrorLine(pos,start_point,end_point, t_s, t_e);
+	          	  curr_good = (error <= errorThreshold/2);
+	          	  arc.curveData.a0 = FindAngle(start_point,end_point);
+	          	  arc.curveData.a1 = FindAngle(end_point,start_point);
+
+	          } else if (arc.curveData.type == curveTypeNone) {
+	        	  return FALSE;			//Something wrong
+	          } else {
+	        	  double error = BezError(pos, arc.curveData.curvePos, start_point, t_s, t_e);
+	          	  curr_good = (error <= errorThreshold/2);
+	          };
+
+	          done = prev_good && !curr_good; //Was better than this last time?
+	          if(!done) {
+	          	  // this arc is fine: we can move 'e' up to see if we can find a wider arc
+	          	  if(curr_good) {
+	          		  prev_e = t_e;		  //remember good end only
+	          		  prev_arc = arc;
+	          		  // if e is already at max, then we're done for this arc.
+	          		  if (t_e >= 1.0) {
+	          			  // make sure we cap at t=1
+	          			  arc.end = prev_e = 1.0;
+	          			  // if we capped the arc segment to t=1 we also need to make sure that
+	          			  // the arc's end angle is correct with respect to the bezier end point.
+	          			  if (t_e > 1.0) {
+	          				  if (arc.curveData.type != curveTypeStraight) {
+	          					  coOrd d;
+	          					  d.x = arc.curveData.curvePos.x + fabs(arc.curveData.curveRadius) * cos(D2R(arc.curveData.a1));
+	          					  d.y = arc.curveData.curvePos.y + fabs(arc.curveData.curveRadius) * sin(D2R(arc.curveData.a1));
+
+	          					  arc.curveData.a1 += FindAngle(d, getPoint(pos,1.0));
+	          					  t_e = 1.0;
+	          				  }
+	          			  }
+	          			  prev_arc = arc;
+	          			  done = TRUE;
+	          			  break;
+	          		  }
+	          		  // if not, move it up by half the iteration distance or to end
+	          		  t_e = t_e + (t_e-t_s)/2;
+	          		  if (t_e > 1.0) t_e = 1.0;
+	          	  }
+	          	  // this is a bad arc: we need to move 'e' down to find a good arc
+	          	  else {
+	          		  t_e = t_m;
+	          	  }
+	          }         // If !Done end
+	        } while(!done && safety++<100);
+	        if(safety>=100) {
+	          return FALSE;				//Failed to make into arcs
+	        }
+	        prev_arc = prev_arc.end==0.0?arc:prev_arc;
+	        trkSeg_t curveSeg;  			//Now set up tempSeg to copy into array
+	        curveSeg.width = track?0:width;
+	        if ( prev_arc.curveData.type == curveTypeCurve ) {
+	        		if (track)
+	        			curveSeg.color = (fabs(prev_arc.curveData.curveRadius)<(GetLayoutMinTrackRadius()-EPSILON))?wDrawColorRed:wDrawColorBlack;
+	        		else
+	        			curveSeg.color = color;
+	        		curveSeg.type = track?SEG_CRVTRK:SEG_CRVLIN;
+	        		curveSeg.u.c.a0 = prev_arc.curveData.a0;
+	        		curveSeg.u.c.a1 = prev_arc.curveData.a1;
+	        		curveSeg.u.c.center = prev_arc.curveData.curvePos;
+	        		if (prev_arc.curveData.negative)
+	        			curveSeg.u.c.radius = -prev_arc.curveData.curveRadius;
+	        		else
+	        			curveSeg.u.c.radius = prev_arc.curveData.curveRadius;
+	        } else {											//Straight Line because all points co-linear
+	        	curveSeg.type = track?SEG_STRTRK:SEG_STRLIN;
+	        	if (track)
+	        		curveSeg.color = wDrawColorBlack;
+	        	else
+	        		curveSeg.color = color;
+	        	curveSeg.u.l.angle = prev_arc.curveData.a1;
+	        	curveSeg.u.l.pos[0] = prev_arc.pos0;
+	        	curveSeg.u.l.pos[1] = prev_arc.pos1;
+	        	curveSeg.u.l.option = 0;
+	        }
+	        addSegBezier(segs, &curveSeg);		//Add to array of segs used
+	        t_s = prev_e;
+	        col++;
+	      } while(prev_e < 1.0);
+
+	      return TRUE;
+};
+/*
+ * Draw Bezier while editing it. It consists of three elements - the curve and one or two control arms.
+ *
+ */
+
+EXPORT void DrawBezCurve(trkSeg_p control_arm1,
+					int cp1Segs_cnt,
+					trkSeg_p control_arm2,
+					int cp2Segs_cnt,
+					trkSeg_p curveSegs,
+					int crvSegs_cnt,
+					wDrawColor color
+					) {
+	long oldDrawOptions = tempD.funcs->options;
+	tempD.funcs->options = wDrawOptTemp;
+	long oldOptions = tempD.options;
+	tempD.options = DC_TICKS;
+	tempD.orig = mainD.orig;
+	tempD.angle = mainD.angle;
+	if (crvSegs_cnt && curveSegs)
+		DrawSegs( &tempD, zero, 0.0, curveSegs, crvSegs_cnt, trackGauge, color );
+	if (cp1Segs_cnt && control_arm1)
+		DrawSegs( &tempD, zero, 0.0, control_arm1, cp1Segs_cnt, trackGauge, drawColorBlack );
+	if (cp2Segs_cnt && control_arm2)
+		DrawSegs( &tempD, zero, 0.0, control_arm2, cp2Segs_cnt, trackGauge, drawColorBlack );
+	tempD.funcs->options = oldDrawOptions;
+	tempD.options = oldOptions;
+
+}
+
+/*
+ * If Track, make it red if the radius is below minimum
+ */
+void DrawTempBezier(BOOL_T track) {
+  if (track) DrawBezCurve(Da.cp1Segs_da,Da.cp1Segs_da_cnt,Da.cp2Segs_da,Da.cp2Segs_da_cnt, (trkSeg_t *)Da.crvSegs_da.ptr,Da.crvSegs_da_cnt,Da.minRadius<(GetLayoutMinTrackRadius()-EPSILON)?drawColorRed:drawColorBlack);
+  else
+	DrawBezCurve(Da.cp1Segs_da,Da.cp1Segs_da_cnt,Da.cp2Segs_da,Da.cp2Segs_da_cnt, (trkSeg_t *)Da.crvSegs_da.ptr,Da.crvSegs_da_cnt,drawColorBlack); //Add Second Arm
+}
+
+void CreateBothControlArms(int selectPoint, BOOL_T track) {
+	if (selectPoint == -1) {
+		Da.cp1Segs_da_cnt = createControlArm(Da.cp1Segs_da, Da.pos[0],
+				Da.pos[1], track, TRUE, Da.trk[0]!=NULL, -1,
+				drawColorBlack);
+		Da.cp2Segs_da_cnt = createControlArm(Da.cp2Segs_da, Da.pos[3],
+				Da.pos[2], track, TRUE, Da.trk[1]!=NULL, -1,
+				drawColorBlack);
+	} else if (selectPoint == 0 || selectPoint == 1) {
+		Da.cp1Segs_da_cnt = createControlArm(Da.cp1Segs_da, Da.pos[0],
+				Da.pos[1], track, TRUE, Da.trk[0]!=NULL, selectPoint,
+				drawColorBlack);
+		Da.cp2Segs_da_cnt = createControlArm(Da.cp2Segs_da, Da.pos[3],
+				Da.pos[2], track, FALSE, Da.trk[1]!=NULL, -1,
+				drawColorBlack);
+	} else {
+		Da.cp1Segs_da_cnt = createControlArm(Da.cp1Segs_da, Da.pos[0],
+				Da.pos[1], track, FALSE, Da.trk[0]!=NULL, -1,
+				drawColorBlack);
+		Da.cp2Segs_da_cnt = createControlArm(Da.cp2Segs_da, Da.pos[3],
+				Da.pos[2], track, TRUE, Da.trk[1]!=NULL,
+				3-selectPoint, drawColorBlack);
+	}
+}
+
+/*
+ * AdjustBezCurve
+ *
+ * Called to adjust the curve either when creating it or modifying it
+ * States are "PICK_POINT" and "POINT_PICKED" and "TRACK_SELECTED".
+ *
+ * In PICK_POINT, the user can select an end-point to drag and release in POINT_PICKED. They can also
+ * hit Enter (which saves the changes) or ESC (which cancels them).
+ *
+ * Only those points which can be picked are shown with circles - locked end-points are not shown.
+ *
+ * SHIFT at release will lock , re-locking any end-points that are aligned with like items at the same position
+ * (Track to unconnected Track, Line to any Line end).
+ *
+ */
+EXPORT STATUS_T AdjustBezCurve(
+		wAction_t action,
+		coOrd pos,
+		BOOL_T track,
+		wDrawColor color,
+		DIST_T width,
+		bezMessageProc message )
+{
+	track_p t;
+	DIST_T d;
+	ANGLE_T angle1, angle2;
+	static coOrd pos0, pos3, p;
+	enum BezierType b;
+	DIST_T dd;
+	EPINX_T ep;
+	double fx, fy, cusp;
+	int controlArm = -1;
+
+
+	if (Da.state != PICK_POINT && Da.state != POINT_PICKED && Da.state != TRACK_SELECTED) return C_CONTINUE;
+
+	switch ( action & 0xFF) {
+
+	case C_START:
+			Da.selectPoint = -1;
+			CreateBothControlArms(Da.selectPoint, track);
+			if (ConvertToArcs(Da.pos,&Da.crvSegs_da,track,color,Da.width)) Da.crvSegs_da_cnt = Da.crvSegs_da.cnt;
+			Da.minRadius = BezierMinRadius(Da.pos,Da.crvSegs_da);
+			Da.unlocked = FALSE;
+			if (track)
+				InfoMessage( _("Select End-Point - Ctrl unlocks end-point") );
+			else
+				InfoMessage( _("Select End-Point") );
+			DrawTempBezier(Da.track);
+			return C_CONTINUE;
+
+	case C_DOWN:
+		if (Da.state != PICK_POINT) return C_CONTINUE;
+		dd = 10000.0;
+		Da.selectPoint = -1;
+		DrawTempBezier(Da.track);   //wipe out
+		for (int i=0;i<4;i++) {
+			d = FindDistance(Da.pos[i],pos);
+			if (d < dd) {
+				if (i==0 && Da.trk[0]) continue;
+				if (i==3 && Da.trk[1]) continue;   //ignore locked points
+				dd = d;
+				Da.selectPoint = i;
+			}
+
+		}
+		if (!IsClose(dd) )	Da.selectPoint = -1;
+		if (Da.selectPoint == -1) {
+			InfoMessage( _("Not close enough to any valid, selectable point, reselect") );
+			DrawTempBezier(Da.track);
+			return C_CONTINUE;
+		} else {
+			pos = Da.pos[Da.selectPoint];
+			Da.state = POINT_PICKED;
+			InfoMessage( _("Drag point %d to new location and release it"),Da.selectPoint+1 );
+		}
+		CreateBothControlArms(Da.selectPoint, track);
+		if (ConvertToArcs(Da.pos, &Da.crvSegs_da, track, color,Da.width)) Da.crvSegs_da_cnt = Da.crvSegs_da.cnt;
+		Da.minRadius = BezierMinRadius(Da.pos, Da.crvSegs_da);
+		DrawTempBezier(Da.track);
+		return C_CONTINUE;
+
+	case C_MOVE:
+		if (Da.state != POINT_PICKED) {
+			InfoMessage(_("Pick any circle to adjust it - Enter to confirm, ESC to abort"));
+			return C_CONTINUE;
+		}
+		//If locked, reset pos to be on line from other track
+		DrawTempBezier(Da.track);   //wipe out
+		if (Da.selectPoint == 1 || Da.selectPoint == 2) {  //CPs
+			int controlArm = Da.selectPoint-1;			//Snap to direction of track
+			if (Da.trk[controlArm]) {
+				angle1 = NormalizeAngle(GetTrkEndAngle(Da.trk[controlArm], Da.ep[controlArm]));
+				angle2 = NormalizeAngle(FindAngle(pos, Da.pos[Da.selectPoint==1?0:3])-angle1);
+				if (angle2 > 90.0 && angle2 < 270.0)
+					Translate( &pos, Da.pos[Da.selectPoint==1?0:3], angle1, -FindDistance( Da.pos[Da.selectPoint==1?0:3], pos )*cos(D2R(angle2)) );
+				else pos = Da.pos[Da.selectPoint==1?0:3];
+			} // Dont Snap control points
+		} else SnapPos(&pos);
+		Da.pos[Da.selectPoint] = pos;
+		CreateBothControlArms(Da.selectPoint, track);
+		if (ConvertToArcs(Da.pos,&Da.crvSegs_da,track, color, Da.width)) Da.crvSegs_da_cnt = Da.crvSegs_da.cnt;
+		Da.minRadius = BezierMinRadius(Da.pos,Da.crvSegs_da);
+		if (Da.track) {
+			b = AnalyseCurve(Da.pos,&fx,&fy,&cusp);
+			if (b==ENDS) {
+				wBeep();
+				InfoMessage(_("Bezier Curve Invalid has identical end points Change End Point"),b==CUSP?"Cusp":"Loop");
+			} else if ( b == CUSP || b == LOOP) {
+				wBeep();
+				InfoMessage(_("Bezier Curve Invalid has %s Change End Point"),b==CUSP?"Cusp":"Loop");
+			} else if ( b == COINCIDENT ) {
+				wBeep();
+				InfoMessage(_("Bezier Curve Invalid has three co-incident points"),b==CUSP?"Cusp":"Loop");
+			} else if ( b == LINE ) {
+				InfoMessage(_("Bezier is Straight Line"));
+			} else
+				InfoMessage( _("Bezier %s : Min Radius=%s Length=%s fx=%0.3f fy=%0.3f cusp=%0.3f"),track?"Track":"Line",
+													FormatDistance(Da.minRadius>=100000?0:Da.minRadius),
+													FormatDistance(BezierLength(Da.pos,Da.crvSegs_da)),fx,fy,cusp);
+		} else
+				InfoMessage( _("Bezier %s : Min Radius=%s Length=%s"),track?"Track":"Line",
+									FormatDistance(Da.minRadius>=100000?0:Da.minRadius),
+									FormatDistance(BezierLength(Da.pos,Da.crvSegs_da)));
+		DrawTempBezier(Da.track);
+		return C_CONTINUE;
+
+	case C_UP:
+		if (Da.state != POINT_PICKED) return C_CONTINUE;
+		//Take last pos and decide if it should be snapped to a track because SHIFT is held (pos0 and pos3)
+		ep = 0;
+		BOOL_T found = FALSE;
+
+		DrawTempBezier(Da.track);  //wipe out
+
+		p = pos;
+
+		if (track && (Da.selectPoint == 0 || Da.selectPoint == 3)) {  //EPs
+			if ((MyGetKeyState() & WKEY_SHIFT) != 0) {   //Snap Track
+				if ((t = OnTrackIgnore(&p, FALSE, TRUE, Da.selectTrack)) != NULL) { //Snap to endPoint
+					ep = PickUnconnectedEndPointSilent(p, t);
+					if (ep != -1) {
+						Da.trk[Da.selectPoint/3] = t;
+						Da.ep[Da.selectPoint/3] = ep;
+						pos0 = Da.pos[(Da.selectPoint == 0)?1:2];
+						pos = GetTrkEndPos(t, ep);
+						found = TRUE;
+					}
+				} else {
+					wBeep();
+					InfoMessage(_("No unconnected End Point to lock to"));
+				}
+			}
+		}
+		if (found) {
+			angle1 = NormalizeAngle(GetTrkEndAngle(Da.trk[Da.selectPoint/3], Da.ep[Da.selectPoint/3]));
+			angle2 = NormalizeAngle(FindAngle(pos, pos0)-angle1);
+			Translate(&Da.pos[Da.selectPoint==0?1:2], Da.pos[Da.selectPoint==0?0:3], angle1, FindDistance(Da.pos[Da.selectPoint==0?1:2],pos)*cos(D2R(angle2)));
+		}
+		Da.selectPoint = -1;
+		CreateBothControlArms(Da.selectPoint,track);
+		if (ConvertToArcs(Da.pos,&Da.crvSegs_da,track,color,Da.width)) Da.crvSegs_da_cnt = Da.crvSegs_da.cnt;
+		Da.minRadius = BezierMinRadius(Da.pos,Da.crvSegs_da);
+		if (Da.track) {
+			b = AnalyseCurve(Da.pos,&fx,&fy,&cusp);
+			if (b==ENDS) {
+				wBeep();
+				InfoMessage(_("Bezier curve invalid has identical end points Change End Point"),b==CUSP?"Cusp":"Loop");
+			} else if ( b == CUSP || b == LOOP) {
+				wBeep();
+				InfoMessage(_("Bezier curve invalid has %s Change End Point"),b==CUSP?"Cusp":"Loop");
+			} else if ( b == COINCIDENT ) {
+				wBeep();
+				InfoMessage(_("Bezier curve invalid has three co-incident points"),b==CUSP?"Cusp":"Loop");
+			} else if ( b == LINE) {
+				InfoMessage(_("Bezier curve is straight line"));
+			}
+				InfoMessage(_("Pick any circle to adjust it - Enter to confirm, ESC to abort"));
+		} else
+			InfoMessage(_("Pick any circle to adjust it - Enter to confirm, ESC to abort"));
+		DrawTempBezier(Da.track);
+		Da.state = PICK_POINT;
+
+		return C_CONTINUE;
+
+	case C_OK:                            //C_OK is not called by Modify.
+		if ( Da.state == PICK_POINT ) {
+			char c = (unsigned char)(action >> 8);
+			if (Da.track && Da.pos[0].x == Da.pos[3].x && Da.pos[0].y == Da.pos[3].y ) {
+				wBeep();
+				ErrorMessage(_("Invalid Bezier Track - end points are identical"));
+				return C_CONTINUE;
+			}
+			if (Da.track) {
+				b = AnalyseCurve(Da.pos,&fx,&fy,&cusp);
+				if ( b == CUSP || b == LOOP ) {
+					wBeep();
+					ErrorMessage(_("Invalid Bezier Curve has a %s - Adjust"),b==CUSP?"Cusp":"Loop");
+					return C_CONTINUE;
+				} else if (b==COINCIDENT) {
+					wBeep();
+					ErrorMessage(_("Invalid Bezier Curve has three coincident points - Adjust"));
+					return C_CONTINUE;
+				} else if(b==ENDS) {
+					ErrorMessage(_("Invalid Bezier Track - end points are identical"));
+					return C_CONTINUE;
+				}
+			}
+			Da.minRadius = BezierMinRadius(Da.pos,Da.crvSegs_da);
+			DrawTempBezier(Da.track);
+			UndoStart( _("Create Bezier"), "newBezier - CR" );
+			if (Da.track) {
+				t = NewBezierTrack( Da.pos, (trkSeg_p)Da.crvSegs_da.ptr, Da.crvSegs_da.cnt);
+				for (int i=0;i<2;i++)
+							if (Da.trk[i] != NULL) ConnectAbuttingTracks(t,i,Da.trk[i],Da.ep[i]);
+			}
+			else t = NewBezierLine(Da.pos, (trkSeg_p)Da.crvSegs_da.ptr, Da.crvSegs_da.cnt,color,width);
+			UndoEnd();
+			if (Da.crvSegs_da.ptr) MyFree(Da.crvSegs_da.ptr);
+			Da.crvSegs_da.ptr = NULL;
+			Da.crvSegs_da.cnt = 0;
+			Da.crvSegs_da.max = 0;
+			DrawNewTrack(t);
+			Da.state = NONE;
+			MainRedraw();
+			MapRedraw();
+			return C_TERMINATE;
+
+		}
+		return C_CONTINUE;
+
+	case C_REDRAW:
+		DrawTempBezier(Da.track);
+		return C_CONTINUE;
+
+	default:
+		return C_CONTINUE;
+	}
+
+
+}
+
+struct extraData {
+				BezierData_t bezierData;
+		};
+
+/*
+ * CmdBezModify
+ *
+ * Called from Modify Command - this function deals with the real (old) track and calls AdjustBezCurve to tune up the new one
+ * Sequence is this -
+ * - The C_START is called from CmdModify C_DOWN action if a track has being selected. The old track is hidden, the editable one is shown.
+ * - C_MOVES will be ignored until a C_UP ends the track selection and moves the state to PICK_POINT,
+ * - C_DOWN then hides the track and shows the Bezier handles version. Selects a point (if close enough and available) and the state moves to POINT_PICKED
+ * - C_MOVE drags the point around modifying the curve
+ * - C_UP puts the state back to PICK_POINT (pick another)
+ * - C_OK (Enter/Space) creates the new track, deletes the old and shows the changed track.
+ * - C_CANCEL (Esc) sets the state to NONE and reshows the original track unchanged.
+ *
+ * Note: Available points are shown - if a Bezier track is attached to its neighbor, only the control point on that side is selectable.
+ * Any free end-point can be locked to a unconnected end point using SHIFT during drag.
+ */
+STATUS_T CmdBezModify (track_p trk, wAction_t action, coOrd pos) {
+	BOOL_T track = TRUE;
+	track_p t;
+	double width = 1.0;
+	long mode = 0;
+	long cmd;
+
+	struct extraData *xx = GetTrkExtraData(trk);
+	cmd = (long)commandContext;
+
+
+	switch (action&0xFF) {
+	case C_START:
+		Da.state = NONE;
+		DYNARR_RESET(trkSeg_t,Da.crvSegs_da);
+		Da.cp1Segs_da_cnt = 0;
+		Da.cp2Segs_da_cnt = 0;
+		Da.selectPoint = -1;
+		Da.selectTrack = NULL;
+
+		if (IsTrack(trk)) Da.track = TRUE;
+		else Da.track = FALSE;
+
+		Da.selectTrack = trk;
+	    Da.trk[0] = GetTrkEndTrk( trk, 0 );
+		if (Da.trk[0]) Da.ep[0] = GetEndPtConnectedToMe(Da.trk[0],trk);
+		Da.trk[1] = GetTrkEndTrk( trk, 1 );
+		if (Da.trk[1]) Da.ep[1] = GetEndPtConnectedToMe(Da.trk[1],trk);
+
+	    for (int i=0;i<4;i++) Da.pos[i] = xx->bezierData.pos[i];              //Copy parms from old trk
+		InfoMessage(_("%s picked - now select a Point"),track?"Track":"Line");
+		Da.state = TRACK_SELECTED;
+		DrawTrack(Da.selectTrack,&mainD,wDrawColorWhite);                    //Wipe out real track, draw replacement
+		return AdjustBezCurve(C_START, pos, Da.track, xx->bezierData.segsColor, xx->bezierData.segsWidth, InfoMessage);
+
+	case C_DOWN:
+		if (Da.state == TRACK_SELECTED) return C_CONTINUE;                   //Ignore until first up
+		return AdjustBezCurve(C_DOWN, pos, Da.track, xx->bezierData.segsColor, xx->bezierData.segsWidth, InfoMessage);
+
+
+	case C_MOVE:
+		if (Da.state == TRACK_SELECTED) return C_CONTINUE;                   //Ignore until first up and down
+		return AdjustBezCurve(C_MOVE, pos, Da.track, xx->bezierData.segsColor, xx->bezierData.segsWidth, InfoMessage);
+
+	case C_UP:
+		if (Da.state == TRACK_SELECTED) {
+			Da.state = PICK_POINT;                                           //First time up, next time pick a point
+		}
+		return AdjustBezCurve(C_UP, pos, Da.track, xx->bezierData.segsColor, xx->bezierData.segsWidth,  InfoMessage);					//Run Adjust
+
+	case C_TEXT:
+		if ((action>>8) != 32)
+			return C_CONTINUE;
+		/* no break */
+	case C_OK:
+		if (Da.state != PICK_POINT) {										//Too early - abandon
+			InfoMessage(_("No changes made"));
+			Da.state = NONE;
+			return C_CANCEL;
+		}
+		UndoStart( _("Modify Bezier"), "newBezier - CR" );
+		if (Da.track) t = NewBezierTrack( Da.pos, (trkSeg_p)Da.crvSegs_da.ptr, Da.crvSegs_da.cnt);
+		else t = NewBezierLine(Da.pos, (trkSeg_p)Da.crvSegs_da.ptr, Da.crvSegs_da.cnt,xx->bezierData.segsColor,xx->bezierData.segsWidth);
+
+		DeleteTrack(trk, TRUE);
+
+		if (Da.track) {
+			for (int i=0;i<2;i++) {										//Attach new track
+				if (Da.trk[i] != NULL && Da.ep[i] != -1) {								//Like the old track
+					ConnectAbuttingTracks(t,i,Da.trk[i],Da.ep[i]);
+				}
+			}
+		}
+		UndoEnd();
+		InfoMessage(_("Modify Bezier Complete - select another"));
+		Da.state = NONE;
+		return C_TERMINATE;
+
+	case C_CANCEL:
+		InfoMessage(_("Modify Bezier Cancelled"));
+		Da.state = NONE;
+		MainRedraw();
+		MapRedraw();
+		return C_TERMINATE;
+
+	case C_REDRAW:
+		return AdjustBezCurve(C_REDRAW, pos, Da.track, xx->bezierData.segsColor, xx->bezierData.segsWidth, InfoMessage);
+	}
+
+	return C_CONTINUE;
+
+}
+
+/*
+ * Find length by adding up the underlying segments. The segments can be straights, curves or bezier.
+ */
+DIST_T BezierLength(coOrd pos[4],dynArr_t segs) {
+
+	DIST_T dd = 0.0;
+	if (segs.cnt == 0 ) return dd;
+	for (int i = 0;i<segs.cnt;i++) {
+		trkSeg_t t = DYNARR_N(trkSeg_t, segs, i);
+		if (t.type == SEG_CRVTRK || t.type == SEG_CRVLIN) {
+			dd += fabs(t.u.c.radius*D2R(t.u.c.a1));
+		} else if (t.type == SEG_BEZLIN || t.type == SEG_BEZTRK) {
+			dd +=BezierLength(t.u.b.pos,t.bezSegs);
+		} else if (t.type == SEG_STRLIN || t.type == SEG_STRTRK ) {
+			dd += FindDistance(t.u.l.pos[0],t.u.l.pos[1]);
+		}
+	}
+	return dd;
+}
+
+DIST_T BezierMinRadius(coOrd pos[4],dynArr_t segs) {
+	DIST_T r = 100000.0, rr;
+	if (segs.cnt == 0 ) return r;
+	for (int i = 0;i<segs.cnt;i++) {
+		trkSeg_t t = DYNARR_N(trkSeg_t, segs, i);
+		if (t.type == SEG_CRVTRK || t.type == SEG_CRVLIN) {
+			rr = fabs(t.u.c.radius);
+		} else if (t.type == SEG_BEZLIN || t.type == SEG_BEZTRK) {
+			rr = BezierMinRadius(t.u.b.pos, t.bezSegs);
+		} else rr = 100000.00;
+		if (rr<r) r = rr;
+	}
+	return r;
+}
+
+/*
+ * Create a Bezier Curve (Track or Line)
+ * Sequence is
+ * 1. Place 1st End (snapping if needed)
+ * 2.Drag out 1st Control Arm (in one direction if snapped)
+ * 3.Place 2nd End (again snapping)
+ * 4.Drag out 2nd Control Arm (constrained if snapped)
+ * 5 to n. Select and drag around points until done
+ * n+1. Confirm with enter or Cancel with Esc
+ */
+STATUS_T CmdBezCurve( wAction_t action, coOrd pos )
+{
+	track_p t;
+	static int segCnt;
+	STATUS_T rc = C_CONTINUE;
+	long curveMode = 0;
+	long cmd;
+	if (action>>8) {
+		cmd = action>>8;
+	} else cmd = (long)commandContext;
+
+	Da.color = lineColor;
+	Da.width = (double)lineWidth/mainD.dpi;
+
+	switch (action&0xFF) {
+
+	case C_START:
+
+		Da.track = (cmd == bezCmdModifyTrack || cmd == bezCmdCreateTrack)?TRUE:FALSE;
+
+		Da.state = POS_1;
+		Da. selectPoint = -1;
+		for (int i=0;i<4;i++) {
+			Da.pos[i] = zero;
+		}
+		Da.trk[0] = Da.trk[1] = NULL;
+		//tempD.orig = mainD.orig;
+
+		DYNARR_RESET(trkSeg_t,Da.crvSegs_da);
+		Da.cp1Segs_da_cnt = 0;
+		Da.cp2Segs_da_cnt = 0;
+		InfoMessage( _("Place 1st end point of Bezier + Shift -> snap to %s end"), Da.track?"Unconnected Track":"Line" );
+		return C_CONTINUE;
+
+
+	case C_DOWN:
+		if ( Da.state == POS_1 || Da.state == POS_2) {   //Set the first or third point
+			coOrd p = pos;
+			BOOL_T found = FALSE;
+			int end = Da.state==POS_1?0:1;
+			EPINX_T ep;
+			if (Da.track) {
+				if ((MyGetKeyState() & WKEY_SHIFT) != 0) {   //Snap Track
+					if ((t = OnTrack(&p, FALSE, TRUE)) != NULL) {
+						ep = PickUnconnectedEndPointSilent(p, t);
+						if (ep != -1) {
+							Da.trk[end] = t;
+							Da.ep[end] = ep;
+							pos = GetTrkEndPos(t, ep);
+							found = TRUE;
+						}
+					}
+					if (!found) {
+						wBeep();
+						InfoMessage(_("Shift used, but no Unconnected Track End there"));
+						return C_CONTINUE;
+					}
+				}
+			} else {													//Snap Bez Line to Lines
+				if ((MyGetKeyState() & WKEY_SHIFT) != 0) {
+					if ((t = OnTrack(&p,FALSE, FALSE)) != NULL) {
+						if (GetClosestEndPt(t,&p)) {
+							pos = p;
+							found = TRUE;
+						}
+					} else {
+						wBeep();
+						InfoMessage(_("Shift used, but no Line End there"));
+						return C_CONTINUE;
+					}
+				}
+			}
+			if (!found) SnapPos( &pos );
+			if (Da.state == POS_1) {
+				Da.pos[0] = pos;
+				Da.pos[1] = pos;
+				Da.state = CONTROL_ARM_1;  //Draw the first control arm
+				Da.selectPoint = 1;
+				InfoMessage( _("Drag end of first Control Arm") );
+				Da.cp1Segs_da_cnt = createControlArm(Da.cp1Segs_da, Da.pos[0], Da.pos[1], Da.track,TRUE,Da.trk[1]!=NULL,1,wDrawColorBlack);
+				DrawBezCurve(Da.cp1Segs_da,Da.cp1Segs_da_cnt,NULL,0,NULL,0,drawColorBlack);
+			} else {
+				Da.pos[3] = pos;  //2nd End Point
+				Da.pos[2] = pos;  //2nd Ctl Point
+				Da.state = POINT_PICKED; // Drag out the second control arm
+				Da.selectPoint = 2;
+				InfoMessage( _("Drag end of second Control Arm") );
+				DrawBezCurve(Da.cp1Segs_da,Da.cp1Segs_da_cnt,NULL,0,NULL,0,drawColorBlack); //Wipe out initial Arm
+				Da.cp1Segs_da_cnt = createControlArm(Da.cp1Segs_da, Da.pos[0], Da.pos[1], Da.track,FALSE,Da.trk[0]!=NULL,-1,wDrawColorBlack);
+				Da.cp2Segs_da_cnt = createControlArm(Da.cp2Segs_da, Da.pos[3], Da.pos[2], Da.track,TRUE,Da.trk[1]!=NULL,1,wDrawColorBlack);
+				if (ConvertToArcs(Da.pos,&Da.crvSegs_da,Da.track,Da.color,Da.width)) Da.crvSegs_da_cnt = Da.crvSegs_da.cnt;
+				DrawTempBezier(Da.track);
+			}
+			return C_CONTINUE;
+		} else  {
+			return AdjustBezCurve( action&0xFF, pos, Da.track, Da.color, Da.width, InfoMessage );
+		}
+		return C_CONTINUE;
+			
+	case C_MOVE:
+		if (Da.state == POS_1) {
+			InfoMessage( _("Place 1st end point of Bezier + Shift -> snap to %s end"), Da.track?"Unconnected Track":"Line" );
+			return C_CONTINUE;
+		}
+		if (Da.state == POS_2) {
+			InfoMessage( _("Select other end of Bezier, +Shift -> snap to %s end"), Da.track?"Unconnected Track":"Line" );
+		}
+		if (Da.state == CONTROL_ARM_1 ) {
+			DrawBezCurve(Da.cp1Segs_da,Da.cp1Segs_da_cnt,NULL,0,NULL,0,drawColorBlack);
+			if (Da.trk[0]) {
+				EPINX_T ep = 0;
+				ANGLE_T angle1,angle2;
+				angle1 = NormalizeAngle(GetTrkEndAngle(Da.trk[0],Da.ep[0]));
+				angle2 = NormalizeAngle(FindAngle(pos, Da.pos[0])-angle1);
+				if (angle2 > 90.0 && angle2 < 270.0)
+					Translate( &pos, Da.pos[0], angle1, -FindDistance( Da.pos[0], pos )*cos(D2R(angle2)));
+				else pos = Da.pos[0];
+			} // Don't Snap control points
+			Da.pos[1] = pos;
+			Da.cp1Segs_da_cnt = createControlArm(Da.cp1Segs_da, Da.pos[0], Da.pos[1], Da.track, TRUE, Da.trk[0]!=NULL, 1, wDrawColorBlack);
+			DrawBezCurve(Da.cp1Segs_da,Da.cp1Segs_da_cnt,NULL,0,NULL,0,drawColorBlack);
+		} else {
+			return AdjustBezCurve( action&0xFF, pos, Da.track, Da.color, Da.width, InfoMessage );
+		}
+		return C_CONTINUE;
+
+	case C_UP:
+		if (Da.state == CONTROL_ARM_1) {
+			DrawBezCurve(Da.cp1Segs_da,Da.cp1Segs_da_cnt,NULL,0,NULL,0,drawColorBlack);
+			if (Da.trk[0]) {
+				EPINX_T ep = Da.ep[0];
+				ANGLE_T angle1,angle2;
+				angle1 = NormalizeAngle(GetTrkEndAngle(Da.trk[0],Da.ep[0]));
+				angle2 = NormalizeAngle(FindAngle(pos, Da.pos[0])-angle1);
+				if (angle2 > 90.0 && angle2 < 270.0)
+					Translate( &pos, Da.pos[0], angle1, -FindDistance( Da.pos[0], pos )*cos(D2R(angle2)));
+				else pos = Da.pos[0];
+			} // Don't Snap control points
+			Da.pos[1] = pos;
+			if (FindDistance(Da.pos[0],Da.pos[1]) <=minLength) {
+				InfoMessage( _("Control Arm 1 is too short, try again") );
+				Da.state = POS_1;
+				return C_CONTINUE;
+			}
+			Da.state = POS_2;
+			InfoMessage( _("Select other end of Bezier, +Shift -> snap to %s end"), Da.track?"Unconnected Track":"Line" );
+			Da.cp1Segs_da_cnt = createControlArm(Da.cp1Segs_da, Da.pos[0], Da.pos[1], Da.track, FALSE, Da.trk[0]!=NULL, -1, wDrawColorBlack);
+			DrawBezCurve(Da.cp1Segs_da,Da.cp1Segs_da_cnt,NULL,0,NULL,0,drawColorBlack);
+			return C_CONTINUE;
+		} else {
+			return AdjustBezCurve( action&0xFF, pos, Da.track, Da.color, Da.width, InfoMessage );
+		}
+	case C_TEXT:
+			if (Da.state != PICK_POINT || (action>>8) != ' ')  //Space is same as Enter.
+				return C_CONTINUE;
+			/* no break */
+    case C_OK:
+    	if (Da.state != PICK_POINT) return C_CONTINUE;
+        return AdjustBezCurve( C_OK, pos, Da.track, Da.color, Da.width, InfoMessage);
+
+	case C_REDRAW:
+		if ( Da.state != NONE ) {
+
+			DrawBezCurve(Da.cp1Segs_da,Da.cp1Segs_da_cnt,Da.cp2Segs_da,Da.cp2Segs_da_cnt,(trkSeg_t *)Da.crvSegs_da.ptr,Da.crvSegs_da.cnt, Da.color);
+		}
+		return C_CONTINUE;
+
+	case C_CANCEL:
+		if (Da.state != NONE) {
+			DrawBezCurve(Da.cp1Segs_da,Da.cp1Segs_da_cnt,Da.cp2Segs_da,Da.cp2Segs_da_cnt,(trkSeg_t *)Da.crvSegs_da.ptr,Da.crvSegs_da.cnt, Da.color);
+			Da.cp1Segs_da_cnt = 0;
+			Da.cp2Segs_da_cnt = 0;
+			Da.crvSegs_da_cnt = 0;
+			for (int i=0;i<2;i++) {
+				Da.trk[i] = NULL;
+				Da.ep[i] = -1;
+			}
+			if (Da.crvSegs_da.ptr) MyFree(Da.crvSegs_da.ptr);
+			Da.crvSegs_da.ptr = NULL;
+			Da.crvSegs_da.cnt = 0;
+			Da.crvSegs_da.max = 0;
+		}
+		Da.state = NONE;
+		return C_CONTINUE;
+		
+	default:
+
+	return C_CONTINUE;
+	}
+
+}
+
+void UpdateParms(wDrawColor color,long width) {
+	DrawTempBezier(Da.track);
+	Da.color = lineColor;
+	Da.width = (double)lineWidth/mainD.dpi;
+	if (Da.crvSegs_da.cnt) {
+		ConvertToArcs(Da.pos,&Da.crvSegs_da,Da.track,Da.color,Da.width);
+	}
+	DrawTempBezier(Da.track);
+}
+
+
+#include "bitmaps/bezier.xpm"
+#include "bitmaps/dbezier.xpm"
+
+EXPORT void InitCmdBezier( wMenu_p menu )
+{	
+
+}