'Valid keyword options are:
x, x0, x1, y, y0, y1, width, height, pen, brush
x specifies the x-position of the center of the bar.
x0, x1 specify left and right edges of the bar, respectively.
width specifies distance from x0 to x1.
You may specify any combination:
x, width
x0, width
x1, width
x0, x1
Likewise y, y0, y1, and height.
If only height is specified, then y0 will be set to 0
Example uses:
BarGraphItem(x=range(5), height=[1,5,2,4,3], width=0.5)'

def __init__(self, **opts):

    GraphicsObject.__init__(self)
    self.opts = dict(x=None, y=None, x0=None, y0=None, x1=None, y1=None, height=None, width=None, pen=None, brush=None, pens=None, brushes=None)
    self._shape = None
    self.picture = None
    self.setOpts(**opts)
