Calculate center of area for a graph -- draws a vertical line which bisects the area of the graph equally, on SpectralWorkbench.org. This variant only counts data between 410-700nm.

centroidish_cutoff

// calculate center of area for a graph -- draws a vertical line which bisects the area of the graph equally

setup: function() {
  // code to run on startup

  flotoptions.grid.markings = []
  var color_count = 0

  // go through each spectrum
  $.each($W.data,function(index,spectrum){
    // calculate total area:
    var area = 0
    $.each(spectrum.data,function(i,v){
      if (v[0] > 410 && v[0] < 700) area += v[1]
    })


    // now find the halfway point
    var count = 0
    $W.colors = flotoptions.colors
    $.each(spectrum.data,function(i,v){
      if (v[0] > 410 && v[0] < 700) {
        if (count < area/2) { count += v[1] }
        else { 
          // draw markers:
          color = flotoptions.colors[color_count]
          color_count += 1
          flotoptions.grid.markings.push({ color: color, lineWidth: 1, xaxis: { from: v[0], to: v[0] } });
          return false 
        }
      }
    })
    
  })

  $W.plot = $.plot($("#graph"),$W.data,flotoptions);

},
 
draw: function() {
  // code to run every frame
 
}