'Set silhouette bar height (row height).'

def setBarHeight(self, height):

    if (height != self.__barHeight):
        self.__barHeight = height
        for item in self.__plotItems():
            item.setPreferredBarSize(height)
        font = self.font()
        font.setPixelSize(height)
        for item in self.__textItems():
            item.setFont(font)
