Python visvis.clf函数代码示例

	def PlotReferencePhase (self, event) :
		"""
		Plot reference phase
		"""
		visvis.cla(); visvis.clf(); 
		
		# get actual amplitude and phased
		phase = self.GetReferencePhase()[0]
		ampl = np.ones(phase.size)
		ampl, phase = self.DevPulseShaper.GetUnwrappedAmplPhase(ampl, phase) 
		
		# Wrap the phase in radians
		phase %= (2*np.pi)
		
		# Get the phase in unites of 2*pi
		phase /= (2*np.pi)
		
		visvis.subplot(211)
		visvis.plot(phase)
		visvis.ylabel ('Reference phase')
		visvis.xlabel ('puls shaper pixel number')
		visvis.title ('Current reference phase (in unites of 2*pi)')
		
		visvis.subplot(212)
		visvis.plot( self.corrections, lc='r',ms='*', mc='r' )
		visvis.ylabel ('Value of coefficients')
		visvis.xlabel ('coefficient number')
		visvis.title ('Value of corrections')

	def _createWindow(self, name, im, axis):

		vv.figure()
		vv.gca()
		vv.clf()
		fig = vv.imshow(im)
		dims = im.shape

		''' Change color bounds '''
		if im.dtype == np.uint8:
			fig.clim.Set(0, 255)
		else:
			fig.clim.Set(0., 1.)
		
		fig.GetFigure().title = name
		
		''' Show ticks on axes? '''
		if not axis:
			fig.GetAxes().axis.visible = False
			bgcolor = (0.,0.,0.)
		else:
			fig.GetAxes().axis.showBox = False
			bgcolor = (1.,1.,1.)

		''' Set background color '''
		fig.GetFigure().bgcolor = bgcolor
		fig.GetAxes().bgcolor = bgcolor

		''' Setup keyboard event handler '''
		fig.eventKeyDown.Bind(self._keyHandler)

		win = {'name':name, 'canvas':fig, 'shape':dims, 'keyEvent':None, 'text':[]}
		self.open_windows.append(win)

		return win

	def DisplayOptimization (self) :
		"""
		Display the progress of optimization
		"""
		wx.Yield()
		# abort, if requested 
		if self.need_abort : return
	
		def GetValueColourIter (d) :
			return izip_longest( d.itervalues(), ['r', 'g', 'b', 'k'],  fillvalue='y' )
	
		visvis.cla(); visvis.clf()
		visvis.subplot(211)
		
		# Plot optimization statistics
		for values, colour in GetValueColourIter(self.optimization_log) :
			try : visvis.plot ( values, lc=colour ) 
			except Exception : pass
		
		visvis.xlabel ('iteration')
		visvis.ylabel ('Objective function')
		visvis.legend( self.optimization_log.keys() )
		
		# Display reference signal
		visvis.subplot(212)
			
		# Plot reference signal
		for values, colour in GetValueColourIter(self.log_reference_signal) :
			try : visvis.plot ( values, lc=colour ) 
			except Exception : pass
		
		visvis.xlabel ('iteration')
		visvis.ylabel ("Signal from reference pulse")
		visvis.legend( ["channel %d" % x for x in self.log_reference_signal.keys()] )

	def ShowImg (self) :
		"""
		Draw image
		"""
		if self._abort_img  :
			# Exit
			return
		
		# Get image
		img = self.dev.StopImgAqusition()
		
		# Display image
		try :
			if img <> RETURN_FAIL :
				self._img_plot.SetData(img)
		except AttributeError :
			visvis.cla()
			visvis.clf()
			self._img_plot = visvis.imshow(img)
			visvis.title ('Camera view')
			ax = visvis.gca()
			ax.axis.xTicks = []
			ax.axis.yTicks = []
		
		# Start acquisition of histogram
		self.dev.StartImgAqusition()
		wx.CallAfter(self.ShowImg)

def show(items, normals=None):
    """Function that shows a mesh object.
    """
    for item in items:
        vv.clf()
        # convert to visvis.Mesh class
        new_normals = []
        new_vertices = []
        for k, v in item.vertices.iteritems():
            new_normals.append(item.normal(k))
            new_vertices.append(v)
        mesh = item.to_visvis_mesh()

        mesh.SetVertices(new_vertices)
        mesh.SetNormals(new_normals)
        mesh.faceColor = 'y'
        mesh.edgeShading = 'plain'
        mesh.edgeColor = (0, 0, 1)

    axes = vv.gca()
    if axes.daspectAuto is None:
        axes.daspectAuto = False
    axes.SetLimits()

    if normals is not None:
        for normal in normals:
            sl = solidLine(normal, 0.15)
            sl.faceColor = 'r'

    # Show title and enter main loop
    vv.title('Show')
    app = vv.use()
    app.Run()

	def StartInteractivelyMeasureSpectrum (self, event) :
		"""
		This method display spectrum
		"""
		button = self.show_spectrum_button
		
		if button.GetLabel() == button.__start_label__ :
			self.StopAllJobs()
			# get spectrometer's settings
			spect_settings = self.SettingsNotebook.Spectrometer.GetSettings()
			
			# Initiate spectrometer
			if self.Spectrometer.SetSettings(spect_settings) == RETURN_FAIL : return
			
			try : self.wavelengths = self.Spectrometer.GetWavelengths()
			except AttributeError : self.wavelengths = None
			
			# Clearing the figure
			visvis.cla(); visvis.clf();		
			
			# Set up timer to draw spectrum
			TIMER_ID = wx.NewId()
			self.spectrum_timer =  wx.Timer (self, TIMER_ID)
			self.spectrum_timer.Start (spect_settings["exposure_time"])
			wx.EVT_TIMER (self, TIMER_ID, self.DrawSpectrum)
			
			# Chose plotting options 
			try :
				self.is_autoscaled_spectrum = not(spect_settings["fix_vertical_axis"])
			except KeyError :
				self.is_autoscaled_spectrum = True
				
			if not self.is_autoscaled_spectrum :
				self.spectrum_plot_limits = ( spect_settings["vertical_axis_min_val"],
											spect_settings["vertical_axis_max_val"] )
			
			# Change button's label
			button.SetLabel (button.__stop_label__)
		
		elif button.GetLabel() == button.__stop_label__ :		
			# Stopping timer
			self.spectrum_timer.Stop()
			del self.spectrum_timer
			# Delete the parameter for auto-scaling
			del self.spectrum_plot_limits, self.is_autoscaled_spectrum
			
			# Delate visvis objects
			try : del self.__interact_2d_spectrum__
			except AttributeError : pass
			try : del self.__interact_1d_spectrum__
			except AttributeError : pass
			
			# Change button's label
			button.SetLabel (button.__start_label__) 
			
		else : raise ValueError("Label is not recognized") 

    def paint(self, visvis):
        vv.clf()

        colors = ["r", "g", "b", "c", "m", "y", "k"]
        for index, dataset in enumerate(self._value):
            l = visvis.plot(dataset, ms="o", mc=colors[index % len(colors)], mw="3", ls="", mew=0)
            l.alpha = 0.3

        self._a = vv.gca()
        self._a.daspectAuto = True

 def _Plot(self, event):
     # Make sure our figure is the active one
     # If only one figure, this is not necessary.
     #vv.figure(self.fig.nr)
     
     # Clear it:
     vv.clf()
     
     # Plot:
     pcv.drawDisplacements(self.a, self.coords, self.edof, self.dofsPerNode, self.elType, doDrawUndisplacedMesh=True, title="Example 09")

    def paint(self, visvis):
        vv.clf()  
        
        colors = ['r','g','b','c','m','y','k']
        for index, dataset in enumerate(self._value):
            l = visvis.plot(dataset, ms='o', mc=colors[ index % len(colors) ], mw='3', ls='', mew=0 )
            l.alpha = 0.3

        self._a = vv.gca()
        self._a.daspectAuto = True

	def MeasureSingleSpectrum (self, event=None) :
		"""
		Button <self.show_spectrum_button> was clicked
		"""
		button = self.show_spectrum_button
		
		if button.GetLabel() == button.__start_label__ :
			self.StopAllJobs()
			# get spectrometer's settings
			spect_settings = self.SettingsNotebook.Spectrometer.GetSettings()
			
			# Initiate spectrometer
			if self.Spectrometer.SetSettings(spect_settings) == RETURN_FAIL : return
			self.wavelengths = self.Spectrometer.GetWavelengths()
			
			# Clearing the figure
			visvis.clf()
		
			def draw_spectrum (event) :
				"""Timer function """
				spectrum = self.Spectrometer.AcquiredData() 
				if spectrum == RETURN_FAIL : return
				# Display the spectrum
				
				############### Take the log of spectrum ##########
				#spectrum = spectrum / float(spectrum.max())
				#np.log10(spectrum, out=spectrum)
				##############################
				
				ax = visvis.gca()
				ax.Clear()	
				visvis.plot (self.wavelengths, spectrum)
				visvis.xlabel("wavelength (nm)")
				visvis.ylabel("counts")
				
				# Display the current temperature
				visvis.title ("Temperature %d (C)" % self.Spectrometer.GetTemperature() )
				
			# Set up timer to draw spectrum
			TIMER_ID = wx.NewId()
			self.spectrum_timer =  wx.Timer (self, TIMER_ID)
			self.spectrum_timer.Start (spect_settings["exposure_time"])
			
			# Change button's label
			button.SetLabel (button.__stop_label__)
			wx.EVT_TIMER (self, TIMER_ID, draw_spectrum)
			
		elif button.GetLabel() == button.__stop_label__ :
			# Stopping timer
			self.spectrum_timer.Stop()
			del self.spectrum_timer
			# Change button's label
			button.SetLabel (button.__start_label__) 
			
		else : raise ValueError("Label is not recognized") 

def main(select=3, **kwargs):
    """Script main function.

    select: int
        1: Medical data
        2: Blocky data, different every time
        3: Two donuts
        4: Ellipsoid

    """
    import visvis as vv  # noqa: delay import visvis and GUI libraries

    # Create test volume
    if select == 1:
        vol = vv.volread('stent')
        isovalue = kwargs.pop('level', 800)
    elif select == 2:
        vol = vv.aVolume(20, 128)
        isovalue = kwargs.pop('level', 0.2)
    elif select == 3:
        with timer('computing donuts'):
            vol = donuts()
        isovalue = kwargs.pop('level', 0.0)
        # Uncommenting the line below will yield different results for
        # classic MC
        # vol *= -1
    elif select == 4:
        vol = ellipsoid(4, 3, 2, levelset=True)
        isovalue = kwargs.pop('level', 0.0)
    else:
        raise ValueError('invalid selection')

    # Get surface meshes
    with timer('finding surface lewiner'):
        vertices1, faces1 = marching_cubes_lewiner(vol, isovalue, **kwargs)[:2]

    with timer('finding surface classic'):
        vertices2, faces2 = marching_cubes_classic(vol, isovalue, **kwargs)

    # Show
    vv.figure(1)
    vv.clf()
    a1 = vv.subplot(121)
    vv.title('Lewiner')
    m1 = vv.mesh(np.fliplr(vertices1), faces1)
    a2 = vv.subplot(122)
    vv.title('Classic')
    m2 = vv.mesh(np.fliplr(vertices2), faces2)
    a1.camera = a2.camera

    # visvis uses right-hand rule, gradient_direction param uses left-hand rule
    m1.cullFaces = m2.cullFaces = 'front'  # None, front or back

    vv.use().Run()

 def _Plot(self, event):
     
     # Make sure our figure is the active one
     # If only one figure, this is not necessary.
     #vv.figure(self.fig.nr)
     
     # Clear it
     vv.clf()
     
     # Plot
     vv.plot([1,2,3,1,6])
     vv.legend(['this is a line'])        

    def __plot(self, spectrum):
        vv.clf()
        axes = vv.gca()
        axes.axis.showGrid = True
        axes.axis.xLabel = 'Frequency (MHz)'
        axes.axis.yLabel = 'Level (dB)'

        total = len(spectrum)
        count = 0.
        for _time, sweep in spectrum.items():
            alpha = (total - count) / total
            vv.plot(sweep.keys(), sweep.values(), lw=1, alpha=alpha)
            count += 1

	def AnalyzeTotalFluorescence (self, event=None) :
		"""
		`analyse_button` was clicked
		"""
		# Get current settings
		settings = self.GetSettings()
	
		# Apply peak finding filter
		signal = self.peak_finders[ settings["peak_finder"] ](self.total_fluorescence)
		
		# Scale to (0,1)
		signal -= signal.min()
		signal = signal / signal.max()
		
		##########################################################################
		
		# Partition signal into segments that are above the background noise  
		#signal = gaussian_filter(total_fluorescence, sigma=0.5)
		background_cutoff = settings["background_cutoff"]
		segments = [ [] ]
		for num, is_segment in enumerate( signal > background_cutoff ) :
			if is_segment : 
				# this index is in the segment
				segments[-1].append( num )
			elif len(segments[-1]) : # this condition is not to add empty segments
				# Start new segments
				segments.append( [] )
		
		# Find peaks as weighted average of the segment
		peaks = [ np.average(self.positions[S], weights=self.total_fluorescence[S]) for S in segments if len(S) ]
		
		##########################################################################
		
		# Saving the positions
		self.chanel_positions_ctrl.SetValue( ", ".join( "%2.4f" % p for p in peaks ) )
		
		##########################################################################
		
		# Plot acquired data
		visvis.cla(); visvis.clf()
		
		visvis.plot( self.positions, signal )
		visvis.plot( peaks, background_cutoff*np.ones(len(peaks)), ls=None, ms='+', mc='r', mw=20)
		visvis.plot( [self.positions.min(), self.positions.max()], [background_cutoff, background_cutoff], lc='r', ls='--', ms=None)
		
		visvis.legend( ["measured signal", "peaks found", "background cut-off"] )
		
		visvis.ylabel( "total fluorescence") 
		visvis.xlabel( 'position (mm)')
		
		

    def setupAxes(self):
        """
            Sets up the axes initially.  Shows a 2d view with a range based 
            on the sensor positions.  Might want to give the user the option to set the range
            in future releases.
            The if statement is for when the sensors got switched.. which only
            happens on 2 subjects, but totally messes up the axes view then.
            
        """
        vv.clf()    
        self.axes = vv.gca()
        self.axisLabeler = self.axes.axis
        self.axes.cameraType = 3
        self.axes.daspectAuto= False

        #.SetLimits(#rangeX = (xmin,xmax),rangeY = (ymin,ymax), rangeZ = (zmin,zmax))
        self.axisLabeler.showGrid = True