Function checkWidth

browsertests/testdata/testflame.js:56–64

(t, fraction)

  // checkWidth checks that the width of the box with text t is approximately
  // the specified fraction of the total width.
  function checkWidth(t, fraction) {
    test.setContext("checkWidth", t, fraction);
    const r = rect(t);
    if (!r) return;
    const expect = (chartRect.width - 2*PADDING) * fraction;
    if (r.width < expect*0.95 || r.width > expect*1.05) {
      test.err("bad width", r.width, "expecting ~", expect);
    }
  }

  // Fake profile has the following stacks:
  //    100 F1 F2 F3