float[] left = {document.left(), document.top(), document.left(), document.bottom()};
float[] right = {document.left() + colMaxWidth, document.top(),
document.left() + colMaxWidth, diamondTop,
document.left() + diamondInset, diamondTop - diamondHeight / 2,
document.left() + colMaxWidth, diamondTop - diamondHeight,
document.left() + colMaxWidth, document.bottom()
};
mct.addColumn(left, right);
// setup column 2
left = new float[] { document.right() - colMaxWidth, document.top(),