def _render(self, params):
ca = ColorAttributes()
ca.back = '#333333'
ca.canvas = '#333333'
ca.shadea = '#000000'
ca.shadeb = '#111111'
ca.mgrid = '#CCCCCC'
ca.axis = '#FFFFFF'
ca.frame = '#AAAAAA'
ca.font = '#FFFFFF'
ca.arrow = '#FFFFFF'
currentTime = int(time.time())
start = currentTime - getIntOrElse(params, "start", (3 * hour))
end = currentTime - getIntOrElse(params, "end", 0)
logarithmic = getBooleanOrElse(params, "logarithmic", False)
step = getIntOrElse(params, "step", 60)
width = getIntOrElse(params, "width", 800)
height = getIntOrElse(params, "height", 400)
graphs = getStringOrElse(params, "graphs", getAllZaehlerNames())
upperlimit = getIntOrElse(params, "upperlimit", None)
lowerlimit = getIntOrElse(params, "lowerlimit", None)
generated_file = "/tmp/%d-%d.png" % (time.time(),random.randint(0, 100000))
g = Graph(generated_file, start=start, end=end, vertical_label='100mWh/min', color=ca)
g.data.extend(self._createLines(graphs))
g.width = width
g.height = height
g.step = step
g.logarithmic = logarithmic
if upperlimit:
g.upper_limit=upperlimit
if lowerlimit:
g.lower_limit=lowerlimit
g.rigid=True
g.write()
return generated_file
