'@todo: docstring'

def setPosn(self, start, end):

    if ((self.startPosn[0] == 0) or (start[0] < self.startPosn[0])):
        self.startPosn[0] = start[0]
    if ((self.startPosn[1] == 0) or (start[1] > self.startPosn[1])):
        self.startPosn[1] = start[1]
    if (end[0] > self.endPosn[0]):
        self.endPosn[0] = end[0]
    if (end[1] > self.endPosn[1]):
        self.endPosn[1] = end[1]
    self.growToWidth = self.endPosn[1]
    self.growToHeight = self.endPosn[0]
