private float calcReferenceHeight(float hCenter) {
float yBefore = origRectangle.getTop();
ColumnTextBuilder tempCtb = b.newColumnTextBuilder();
singleColumnRect.copyPositionsFrom(origRectangle);
singleColumnRect.setBottom(-100000f);
singleColumnRect.setRight(hCenter);
applyPadding(singleColumnRect, true);
tempCtb.setSimpleColumn(singleColumnRect.get());
final DirectContentAdder adder = new DirectContentAdder(tempCtb);
adder
.setStartWith(initialLeftCTB)
.setStartAtIndex(startAtElement)
.setSimulate(true)
.setHeights(true)
.go();
sequence.initialContentHeight = adder.startContentHeight;
float yAfter = tempCtb.getYLine();
return (yBefore - yAfter);
}
