CM6 equivalent to cm.heightAtLine?

How can I get line offset in pixels just like with cm.heightAtLine?

Call lineBlockAt with a position inside the line.

I have the same problem, does anyone have any advice?

I want the same effect as the following, how should I achieve it in CM6

editor.heightAtLine(child.position.start.line - 1, “local”);

Something like view.lineBlockAt(pos).top.