SMPTE

// A television test card: seven color bars, a reversed chroma strip,
// and a row of near-black reference patches.

var barCount = intVariable('bars', 4, 9);
var topShare = intVariable('topShare', 55, 80);

var bars    = ['#c0c0c0', '#c0c000', '#00c0c0', '#00c000', '#c000c0', '#c00000', '#0000c0'];
var reverse = ['#0000c0', '#111111', '#c000c0', '#111111', '#00c0c0', '#111111', '#c0c0c0'];
var pluge   = ['#00214c', '#ffffff', '#32006a', '#111111', '#070707', '#111111', '#1a1a1a', '#111111'];

var topHeight = height * (topShare / 100);
var midHeight = (height - topHeight) * 0.28;
var botTop = topHeight + midHeight;

function row(colors, y, h, n) {
  var w = width / n;
  for (var i = 0; i < n; i++) {
    s.rect(i * w, y, w + 1, h).attr({fill: colors[i % colors.length]});
  }
}

s.rect(0, 0, width, height).attr({fill: '#111111'});

row(bars, 0, topHeight, barCount);
row(reverse, topHeight, midHeight, barCount);
row(pluge, botTop, height - botTop, getRandomInt(barCount, barCount + 3));