import java.awt.Rectangle as Rectangle

import ch.psi.pshell.imaging.Data as Data
class Exposure(Writable):
    def write(self,pos):
        #cam.setExposure(pos)
        img.camera.setExposure(pos)
exposure=Exposure()


class Contrast(Readable):
    def read(self):
        data = img.getData()
        #roi = Data(data.getRectSelection(500,300,700,600), False)
        #return data.getGradientVariance(False, Rectangle(480,0,600,670))
        return data.getGradientVariance(False, None)
contrast=Contrast()


#a= lscan(exposure,img.getContrast(), 0.5, 1.0, 0.01, 0.5)
#a= lscan(exposure,contrast, 0.2, 0.4, 0.01, 0.7)
ret= lscan(exposure,contrast, 10.0, 150.0, 5.0, 0.5)
y, x = ret.getReadable(0), ret.getPositions(0)

#(n, m, s) = fit(a.getReadable(0), xdata=a.getPositions(0))
#if m is None:
#    m=max(a.getReadable(0))
m=x[y.index(max(y))]
p=get_plots()[0]
p.addMarker(m, p.AxisId.X, str(m), Color.RED)

print "Setting exposure = ", m
exposure.write(m)