//mc is the mc
//textfield is the textfield in question
//mcX/Y is the position to place the mc after the text
//getLineMetrics also returns ascent, descent, width, height, x, and leading

var mcX:int=(textfield.x+textfield.getLineMetrics(textfield.numLines-1).width)+(mc.width+20);
var mcY:int=(textfield.y+textfield.textHeight)+(mc.height+10);

var mcX:int=(textfield.x+textfield.getLineMetrics(textfield.numLines-1).width)+(mc.width+20);
var mcY:int=(textfield.y+textfield.textHeight)+(mc.height+10);

find X and Y positions of the last word of a line in a dynamic text field

ActionScript 3