'Closes current line item and starts a new one.
Remark: if current line became too long, animation
performance (via _drawline) slowed down considerably.'

def _newLine(self, usePos=True):

    if (len(self.currentLine) > 1):
        self.screen._drawline(self.currentLineItem, self.currentLine, self._pencolor, self._pensize)
        self.currentLineItem = self.screen._createline()
        self.items.append(self.currentLineItem)
    else:
        self.screen._drawline(self.currentLineItem, top=True)
    self.currentLine = []
    if usePos:
        self.currentLine = [self._position]
