// This ImageJ macro tool draws a line, and overlays it's profile. // see https://list.nih.gov/cgi-bin/wa.exe?A2=IMAGEJ;197bef78.1310

LineAndProfileTool.txt

// This tool draws a line, and overlays its profile and some infos
 
 macro "Line and Profile Tool -C00bL1de0L1ee1" {
        getCursorLoc(x, y, z, flags);
        xstart = x; ystart = y;
        x2=x; y2=y;        
        while (true) {
            getCursorLoc(x, y, z, flags);
            if (flags&16==0) {
                dx=x2-xstart; dy=y2-ystart;
               exit;
            }
            if (x!=x2 || y!=y2) {
                makeLine(xstart, ystart, x, y);
  		overlayProfile(xstart, ystart, x, y);
			}
            x2=x; y2=y;
            wait(10);
        };
    }
 }
 
function overlayProfile(xa,ya,xb,yb) {
	Overlay.remove;
	p = getProfile();
	Array.getStatistics(p, min, max, mean, stdDev);
	List.setMeasurements;
	text = 'Length:'+d2s(List.getValue('Length'),2)+'\nmin:'+d2s(min,2)+'\nmax:'+d2s(max,2);
	setFont('SanSerif', 14, 'bold antialiased');
	setColor('black');
	Overlay.drawString(text, 10-1, 20-1);
	setColor('cyan');
	Overlay.drawString(text, 10, 20);
	Overlay.moveTo(xa, ya);
	setColor('green');	
	setLineWidth(2);
	for (i=0;i<p.length;i++) {
		xs = (xb-xa)/p.length;
		ys = (ya-yb)/p.length;
		d = 100-100*p[i]/max;
		a = atan ((yb-ya)/(xb-xa));
		Overlay.lineTo(xa+i*xs-d*sin(a), ya-i*ys+d*cos(a));
	}
	Overlay.lineTo(xb, yb);
	Overlay.show;

}