Find traces that intersect the graph marquee

#include <Graph Utility Procs>

// Make a list of all traces that have points that fall within the marquee
Function/S ListTracesInMarquee(graphname)
    String graphname
   
    String tlist = TraceNameList(graphname, ";", 1)
    Variable ntraces = ItemsInList(tlist)
   
    Make/O/D/N=4/FREE marqueeX, marqueeY
   
    GetMarquee/W=$graphname left, bottom
    marqueeY = {V_top, V_top, V_bottom, V_bottom}
    MarqueeX = {V_left, V_right, V_right, V_left}
   
    String theList = ""
    Variable i
    for (i = 0; i < ntraces; i += 1)
        String onetrace = StringFromList(i, tlist)
        Wave ywave = TraceNameToWaveRef(graphname, onetrace)
        Wave/Z xwave = XWaveRefFromTrace(graphname, onetrace)
        if (!WaveExists(xwave))
            Duplicate/O/FREE ywave, xwave
            xwave = pnt2x(ywave, p)
        endif
        String offsetinfo = WMGetRECREATIONInfoByKey("offset(x)", traceinfo(graphname, onetrace, 0))
        offsetinfo = offsetinfo[1, strlen(offsetinfo)-2]
        Variable xoffset = str2num(stringfromlist(0, offsetinfo, ","))
        Variable yoffset = str2num(stringfromlist(1, offsetinfo, ","))
        marqueeY -= yoffset
        marqueeX -= xoffset
        FindPointsInPoly xwave, ywave, marqueeX, marqueeY
        marqueeY += yoffset
        marqueeX += xoffset
        Wave W_inPoly
        if (sum(W_inPoly) > 0)
            theList += onetrace+";"
        endif
    endfor
   
    return theList
end

// Example of using ListTracesInMarquee: change the color of all traces that intersect the marquee
Function ColorTracesInMarquee(graphname, red, green, blue)
    String graphname
    Variable red, green, blue
   
    String tlist = ListTracesInMarquee(graphname)
    Variable ntraces = ItemsInList(tlist)
   
    Variable i
    for (i = 0; i < ntraces; i += 1)
        String onetrace = StringFromList(i, tlist)
        ModifyGraph/W=$graphname rgb($onetrace)=(red, green, blue)
    endfor
end