macro "Add Segment Tool (or press alt key remove segment) -C000De8C000C111D07D08D09D0aD0bD0cD0dD1dD28D2dD38D3dD43D48D4dD53D56D57D58D59D5aD5dD63D68D6dD73D78D7dD83D8dD93D9dDa3Da8Da9DadDb3DbdDc3DcdDd3DdcDddDe3De4C111C222D16D25D34Db7DbaDc6DcbDd5C222C333C444C555C666C777C888C999CaaaD17D26D35D44D69D6aDb8Db9Dc7DcaDd6Dd8DdbDe5De7De9Df6Df8CaaaD06D15D24D33Da7DaaDb6DbbDc5DccDd4CaaaCbbbCcccCdddD42D65D66D67D98D99DecDf4Cddd"{

// This macro tool is an image tool for adding a segment to Polygon or Segmented Line selections.
//
//

//Check Polygon or Segmented Line Selections
if(!(selectionType == 6 || selectionType == 2))exit("Segmented line selections required");
leftButton=16;
      rightButton=4;
      shift=1;
      ctrl=2; 
      alt=8;
      x2=-1; y2=-1; z2=-1; flags2=-1;
//Get the cursor location in pixels and the mouse event modifier flags.
getCursorLoc(x, y, z, flags);
      // print("Sample: "+x+" "+y);
//XY coordinates of the nodes of the ROI goes into each of the array of x1 and y1.
getSelectionCoordinates(x1, y1);


//An array of node ID closest to the position clicked
 
nmin=0;

//An array of node ID closest to the second position clicked

nmin2=0;
//ID and ask the nearest distance from the position that was clicked
Min=sqrt((x-x1[0])*(x-x1[0])+(y-y1[0])*(y-y1[0]));
	for(i=1;i<x1.length;i++){
		ls=sqrt((x-x1[i])*(x-x1[i])+(y-y1[i])*(y-y1[i]));
		if(Min>ls) {
		nmin=i;
		Min=ls;

		}

	}




//Check both sides of the closest position
if(nmin+1> x1.length-1)i=0;
else{i=nmin+1;}

	ls2=sqrt((x-x1[i])*(x-x1[i])+(y-y1[i])*(y-y1[i]));


if(nmin-1<0){
		im=x1.length-1;
	}else{
		im=nmin-1;
	}


	ls0=sqrt((x-x1[im])*(x-x1[im])+(y-y1[im])*(y-y1[im]));


//Adding to the near side
	if(ls2<ls0)
		{	nmin2=nmin+1;
			Min2=ls2;
		}else{
			nmin2=im;
			Min2=ls0;
		}
	
//print("nmin="+nmin);

//print("nmin2="+nmin2);
//Remove the node that has been pressing the alt key, otherwise the node
//is added
if (flags&alt!=0) {

x2=newArray(x1.length-1);
y2=newArray(y1.length-1);

	for(i=0;i<nmin;i++){
		x2[i]=x1[i];
		y2[i]=y1[i];
	}

	for(i=nmin+1;i<x1.length;i++){
			x2[i-1]=x1[i];
			y2[i-1]=y1[i];

	}


}
else{

	x2=newArray(x1.length+1);
	y2=newArray(y1.length+1);
	if(nmin<nmin2){
		i0=nmin;
	}
	else{
		i0=nmin2;
	}
	//print(i0);
	for(i=0;i<i0;i++){
	x2[i]=x1[i];
	y2[i]=y1[i];
	}

		x2[i0]=x1[i0];
		y2[i0]=y1[i0];
		y2[i0+1]=y;
		x2[i0+1]=x;
	for(i=i0+2;i<x1.length+1;i++){
		x2[i]=x1[i-1];
		y2[i]=y1[i-1];
	}
		
		

}

//col=SColor(2);
//roiManager("Set Color", col);

if(selectionType==6)
	makeSelection(6, x2, y2);
if(selectionType==2)
	makeSelection(2, x2, y2);
//restoreSettings;

	
    }