class Image(ReadonlyRegisterBase, ReadonlyRegisterMatrix):
    def doRead(self):
        time.sleep(0.001)
        self.val = to_array(self.calc(), 'd')
        return self.val

    def getWidth(self):
        return len(self.take(-1)[0])

    def getHeight(self):
        return len(self.take(-1))

class SinusoidImage(Image):
    def calc(self):     
        (width, height) = (200, 100)
        ret = []
        x = random.random();
        base = []        
        for i in range (width):
            base.append( math.sin(x))
            x = x + 0.05
        for i in range (height):
            noise = (random.random() - 0.5)/5.0 
            ret.append([x+noise for x in base])
        return ret 
               
    def calc(self):     
        (width, height) = (200, 100)
        ret = []   
        for i in range (height):
            ret.append([0] * width)
        return ret  

add_device(SinusoidImage("im1"), True)
p=show_panel(im1)
p.setAsyncUpdates(True)
im1.polling=200

add_device(RegisterMatrixSource("src1", im1), True)
p=show_panel(src1)