def __init__(self, x_title=None, y_title=None, x_lim=None, y_lim=None, x_labels=True, y_labels=True):
<EOL>self.x_title  = x_title;<EOL>self.y_title  = y_title;<EOL>self.x_lim    = x_lim;<EOL>self.y_lim    = y_lim;<EOL>self.x_labels = x_labels;<EOL>self.y_labels = y_labels<EOL>
!
        @brief Constructor of canvas.

        @param[in] x_title (string): Title for X axis, if 'None', then nothing is displayed.
        @param[in] y_title (string): Title for Y axis, if 'None', then nothing is displayed.
        @param[in] x_lim (list): Defines borders of X axis like [from, to], for example [0, 3.14], if 'None' then
                    borders are calculated automatically.
        @param[in] y_lim (list): Defines borders of Y axis like [from, to], if 'None' then borders are calculated
                    automatically.
        @param[in] x_labels (bool): If True then labels of X axis are displayed.
        @param[in] y_labels (bool): If True then labels of Y axis are displayed.