Set the size of the chart.

            Args:
                height (int): height in pixels.
                width (int): width in pixels.
                height_threshold (int): height threshold in pixels
                width_threshold (int): width threshold in pixesls

def set_size(self, height=220, width=350,
                 height_threshold=120,
                 width_threshold=160):
        """Set the size of the chart.

            Args:
                height (int): height in pixels.
                width (int): width in pixels.
                height_threshold (int): height threshold in pixels
                width_threshold (int): width threshold in pixesls

        """
        self.set_integer("height", height)
        self.set_integer("width", width)
        self.set_integer("small_height_threshold", height_threshold)
        self.set_integer("small_width_threshold", width_threshold)