python-3.xwxpython
Showing value of pixel from NetCDF in another panel using matplotlib and wxpython?
I have questions about code when I plot figure with imshow matplotlib I have a plot with x y and z= value of pixel like picture :
code :
import netCDF4
import numpy as np
import matplotlib
import matplotlib.pyplot as plt
path = 'D/data/'
fic = 'air.departure.sig995.2012.nc'
nc = netCDF4.Dataset(path+fic,'r')
var = nc.variables.keys()
lats = nc.variables['lat'][:] # extract/copy the data
lons = nc.variables['lon'][:]
air_dep = nc.variables['air_dep'][:,:,:]
air_dep = air_dep[0,:,:]
plt.imshow(air_dep)
plt.show()
I have an app with wxpython I can show in other panel the cordinates cursor x y but I need to show the value of pixel z how can I do that?
This is the code for application:
import wx
import numpy as np
import netCDF4
from netCDF4 import Dataset
from matplotlib.backends.backend_wxagg import FigureCanvasWxAgg as FigureCanvas
from matplotlib.figure import Figure
import matplotlib.patches as patches
import matplotlib
class Window(wx.Frame):
""" Fenêtre principale de l'application """
def __init__(self, **kwargs):
super().__init__(None, **kwargs)
RootPanel(self)
class RootPanel(wx.Panel):
""" Panel contenant tous les autres widgets de l'application """
def __init__(self, parent):
super().__init__(parent)
panel_buttons = wx.Panel(self)
panel_buttons_sizer = wx.GridSizer(1, 2, 0, 0)
self.canvas_panel = CanvasPanel(self)
self.panel_two = PanelTwo(parent=self)
select_button = PickButton(
panel_buttons,
"netCDF4 files (nc)|*.nc",
self.canvas_panel.load_from_file,
label="Show on this window (nc)",
)
toplevel_select_button = TopLevelPickButton(
panel_buttons,
"Text files (txt)|*.txt|All files|*.*",
label="Show on separate window (txt)",
)
panel_buttons_sizer.Add(select_button)
panel_buttons_sizer.Add(toplevel_select_button)
panel_buttons.SetSizer(panel_buttons_sizer)
canvas_sizer = wx.BoxSizer(wx.HORIZONTAL)
canvas_sizer.Add(self.canvas_panel,1,wx.EXPAND)
canvas_sizer.Add(self.panel_two,1,wx.EXPAND)
sizer = wx.BoxSizer(wx.VERTICAL)
sizer.Add(panel_buttons)
sizer.Add(canvas_sizer)
self.SetSizerAndFit(sizer)
self.Show()
class PickButton(wx.Button):
""" Bouton permettant de choisir un fichier """
def __init__(self, parent, wildcard, func, **kwargs):
# func est la méthode à laquelle devra être foruni le fichier sélectionné
super().__init__(parent, **kwargs)
self.wildcard = wildcard
self.func = func
self.Bind(wx.EVT_BUTTON, self.pick_file)
def pick_file(self, evt):
style = style = wx.FD_OPEN | wx.FD_FILE_MUST_EXIST | wx.FD_MULTIPLE
with wx.FileDialog(
self, "Pick files", wildcard=self.wildcard, style=style
) as fileDialog:
if fileDialog.ShowModal() != wx.ID_CANCEL:
chosen_file = fileDialog.GetPath()
self.func(chosen_file)
class TopLevelPickButton(PickButton):
""" Permet de choisir un fichier et d'ouvrir une toplevel """
def __init__(self, parent, wildcard, **kwargs):
super().__init__(parent, wildcard, self.create_toplevel, **kwargs)
def create_toplevel(self, file_name):
""" Ouvre une toplevel et affiche le graphique """
self.win = TopLevelCanvas(self.Parent)
self.win.canvas_panel.load_from_file(file_name)
self.win.Show()
class CanvasPanel(wx.Panel):
""" Panel du graphique matplotlib """
def __init__(self, parent , size=(200,250)):
super().__init__(parent)
self.figure = Figure(figsize =(5,5))
self.canvas = FigureCanvas(self, -1, self.figure)
self.Size = self.canvas.Size
self.parent = parent
def load_from_file(self, file_name):
"""
Méthode effectuant l'intermédiaire pour charger le fichier selon
son type
"""
self.axes = self.figure.add_subplot(111)
if file_name.endswith(".nc"):
self._load_nc(file_name)
else:
self._load_txt(file_name)
self.canvas.draw()
def _load_txt(self, file_name):
self._load_nc(file_name)
def _load_nc(self, file_name):
""" Simule le chargement et affichage à partir d'un fichier nc """
fic='air.departure.sig995.2012.nc'
path='D:/data/'
nc = netCDF4.Dataset(path+fic,'r')
lons = nc.variables['lon'][:]
lats = nc.variables['lat'][:]
air_dep = nc.variables['air_dep'][:,:,:]
air_dep = air_dep[0,:,:]
self.axes.imshow(air_dep)
self.canvas.mpl_connect('button_press_event', self.on_press)
x = y = 1
self.rect = patches.Rectangle((x, y), 5,5,edgecolor='r', alpha=1, fill=None, label='Label')
self.axes.add_patch(self.rect)
self.axes.plot()
self.Show()
def on_press(self, click):
x1, y1 = click.xdata, click.ydata
self.parent.panel_two.Update(x1,y1)
zx1 = x1 - 2.5
zy1 = y1 - 2.5
zx2 = x1 + 2.5
zy2 = y1 + 2.5
self.rect.set_x(x1 - 2.5) #Move the rectangle and centre it on the X click point
self.rect.set_y(y1 - 2.5) #Move the rectangle and centre it on the Y click point
self.axes.plot()
self.canvas.draw()
class PanelTwo(wx.Panel): #here when i need to visualize pixel and coordinator cursor
def __init__(self,parent):
wx.Panel.__init__(self,parent,size=(300,250))
self.text_ctrl = wx.TextCtrl(self, -1, "", style=wx.TE_MULTILINE|wx.BORDER_SUNKEN|wx.TE_READONLY|wx.TE_RICH2, size=(200,170))
lbl = wx.StaticText(self,label="Coordinato cursor & Pixel ")
sizer = wx.BoxSizer(wx.VERTICAL)
sizer.Add(lbl,0, wx.ALIGN_CENTRE,10)
sizer.Add(self.text_ctrl,0, wx.ALIGN_CENTRE,10)
self.SetSizer(sizer)
def Update(self,x1,y1):
self.text_ctrl.SetValue("Mouse click at;\nX "+str(x1)+"\nY "+str(y1))
class TopLevelCanvas(wx.Frame):
""" Fenêtre affichant uniquement un graph matplotlib """
def __init__(self, parent, **kwargs):
super().__init__(parent, **kwargs)
self.canvas_panel = CanvasPanel(self)
self.zoom_panel = Zoom(parent=self)
self.Size = self.canvas_panel.Size
canvas_sizer = wx.BoxSizer(wx.HORIZONTAL)
canvas_sizer.Add(self.canvas_panel,1,wx.EXPAND)
canvas_sizer.Add(self.zoom_panel,1,wx.EXPAND)
self.SetSizerAndFit(canvas_sizer)
self.Show()
class App(wx.App):
def OnInit(self):
win = Window(title="A test dialog", size=(1000, 800))
win.Show()
return True
if __name__ == "__main__":
app = App()
app.MainLoop()
How can I show the value of pixel in the paneltwo like x y coordinates? AND ALL VALUES OF AIR_DEP IN WINDOWS 5X5 like this example : IR_108 is other variables value
thank you
Solution
When you say "pixel z" do you mean the air_dep value?
import wx
import numpy as np
import netCDF4
from netCDF4 import Dataset
from matplotlib.backends.backend_wxagg import FigureCanvasWxAgg as FigureCanvas
from matplotlib.figure import Figure
import matplotlib.patches as patches
import matplotlib
class Window(wx.Frame):
""" Fenêtre principale de l'application """
def __init__(self, **kwargs):
super().__init__(None, **kwargs)
RootPanel(self)
class RootPanel(wx.Panel):
""" Panel contenant tous les autres widgets de l'application """
def __init__(self, parent):
super().__init__(parent)
panel_buttons = wx.Panel(self)
panel_buttons_sizer = wx.GridSizer(1, 2, 0, 0)
self.canvas_panel = CanvasPanel(self)
self.panel_two = PanelTwo(parent=self)
select_button = PickButton(
panel_buttons,
"netCDF4 files (nc)|*.nc",
self.canvas_panel.load_from_file,
label="Show on this window (nc)",
)
toplevel_select_button = TopLevelPickButton(
panel_buttons,
"Text files (txt)|*.txt|All files|*.*",
label="Show on separate window (txt)",
)
panel_buttons_sizer.Add(select_button)
panel_buttons_sizer.Add(toplevel_select_button)
panel_buttons.SetSizer(panel_buttons_sizer)
canvas_sizer = wx.BoxSizer(wx.HORIZONTAL)
canvas_sizer.Add(self.canvas_panel,1,wx.EXPAND)
canvas_sizer.Add(self.panel_two,1,wx.EXPAND)
sizer = wx.BoxSizer(wx.VERTICAL)
sizer.Add(panel_buttons)
sizer.Add(canvas_sizer)
self.SetSizerAndFit(sizer)
self.Show()
class PickButton(wx.Button):
""" Bouton permettant de choisir un fichier """
def __init__(self, parent, wildcard, func, **kwargs):
# func est la méthode à laquelle devra être foruni le fichier sélectionné
super().__init__(parent, **kwargs)
self.wildcard = wildcard
self.func = func
self.Bind(wx.EVT_BUTTON, self.pick_file)
def pick_file(self, evt):
style = style = wx.FD_OPEN | wx.FD_FILE_MUST_EXIST | wx.FD_MULTIPLE
with wx.FileDialog(
self, "Pick files", wildcard=self.wildcard, style=style
) as fileDialog:
if fileDialog.ShowModal() != wx.ID_CANCEL:
chosen_file = fileDialog.GetPath()
self.func(chosen_file)
class TopLevelPickButton(PickButton):
""" Permet de choisir un fichier et d'ouvrir une toplevel """
def __init__(self, parent, wildcard, **kwargs):
super().__init__(parent, wildcard, self.create_toplevel, **kwargs)
def create_toplevel(self, file_name):
""" Ouvre une toplevel et affiche le graphique """
self.win = TopLevelCanvas(self.Parent)
self.win.canvas_panel.load_from_file(file_name)
self.win.Show()
class CanvasPanel(wx.Panel):
""" Panel du graphique matplotlib """
def __init__(self, parent , size=(200,250)):
super().__init__(parent)
self.figure = Figure(figsize =(5,3))
self.canvas = FigureCanvas(self, -1, self.figure)
self.Size = self.canvas.Size
self.parent = parent
def load_from_file(self, file_name):
"""
Méthode effectuant l'intermédiaire pour charger le fichier selon
son type
"""
self.axes = self.figure.add_subplot(111)
if file_name.endswith(".nc"):
self._load_nc(file_name)
else:
self._load_txt(file_name)
self.canvas.draw()
def _load_txt(self, file_name):
self._load_nc(file_name)
def _load_nc(self, file_name):
""" Simule le chargement et affichage à partir d'un fichier nc """
fic='air.departure.sig995.2012.nc'
#path='/home/data/'
path=''
nc = netCDF4.Dataset(path+fic,'r')
self.lons = nc.variables['lon'][:]
self.lats = nc.variables['lat'][:]
air_dep = nc.variables['air_dep'][:,:,:]
self.air_dep = air_dep[0,:,:]
self.axes.imshow(self.air_dep)
self.canvas.mpl_connect('button_press_event', self.on_press)
x = y = 1
self.rect = patches.Rectangle((x, y), 5,5,edgecolor='r', alpha=1, fill=None, label='Label')
self.axes.add_patch(self.rect)
self.axes.plot()
def float_to_dms(self,f):
# convert to seconds
f = f * 3600
if f < 0:
div1 = -3600
div2 = -1
else:
div1 = 3600
div2 = 1
#Degrees,minutes,seconds
d,m = divmod(f,div1)
m,s = divmod(m*60,div1)
s, x = divmod(s*60,div1)
d,x = divmod(d,div2)
m,x = divmod(m,1)
s,x = divmod(s,1)
return ("\n\t"+str(int(d))+"° "+str(int(m)).zfill(2)+"' "+str(int(s)).zfill(2)+'"\n')
def on_press(self, click):
x1, y1 = click.xdata, click.ydata
#Longititude values are 2.5 degrees apart for this data
lon = x1*2.5
#Latitude values from 90 to -90 2.5 degrees apart
#split the y value
i,f = divmod(y1,1)
lat = self.lats[int(i)]
#calculate the fraction of degrees
if lat > 0 and lat < 87.5:
lat = lat+(f*2.5)
elif lat < 0 and lat > -87.5:
lat = lat-(f*2.5)
#Convert to ° ' "
lon_dms = self.float_to_dms(lon)
lat_dms = self.float_to_dms(lat)
#air_dep seems the wrong way round but what do I know
#The way below gives values that seem correct
air = self.air_dep[int(y1),int(x1)]
self.parent.panel_two.Update(x1,y1,lon,lat,air,lon_dms,lat_dms)
zx1 = x1 - 2.5
zy1 = y1 - 2.5
zx2 = x1 + 2.5
zy2 = y1 + 2.5
self.rect.set_x(x1 - 2.5) #Move the rectangle and centre it on the X click point
self.rect.set_y(y1 - 2.5) #Move the rectangle and centre it on the Y click point
self.axes.plot()
self.canvas.draw()
class PanelTwo(wx.Panel): #here when i need to visualize pixel and coordinator cursor
def __init__(self,parent):
wx.Panel.__init__(self,parent,size=(300,250))
self.text_ctrl = wx.TextCtrl(self, -1, "", style=wx.TE_MULTILINE|wx.BORDER_SUNKEN|wx.TE_READONLY|wx.TE_RICH2, size=(200,200))
lbl = wx.StaticText(self,label="Coordinato cursor & Pixel ")
sizer = wx.BoxSizer(wx.VERTICAL)
sizer.Add(lbl,0, wx.ALIGN_CENTRE,10)
sizer.Add(self.text_ctrl,0, wx.ALIGN_CENTRE,10)
self.SetSizer(sizer)
def Update(self,x1,y1,lon,lat,air,lon_dms,lat_dms):
update_str = "Mouse click at;\nX "+str(x1)+"\nLon "+str(lon)+"\n"+lon_dms+"\nY "+str(y1)+"\nLat "+str(lat)+"\n"+lat_dms+"\nAir Value "+str(air)
self.text_ctrl.SetValue(update_str)
class TopLevelCanvas(wx.Frame):
""" Fenêtre affichant uniquement un graph matplotlib """
def __init__(self, parent, **kwargs):
super().__init__(parent, **kwargs)
self.canvas_panel = CanvasPanel(self)
self.zoom_panel = Zoom(parent=self)
self.Size = self.canvas_panel.Size
canvas_sizer = wx.BoxSizer(wx.HORIZONTAL)
canvas_sizer.Add(self.canvas_panel,1,wx.EXPAND)
canvas_sizer.Add(self.zoom_panel,1,wx.EXPAND)
self.SetSizerAndFit(canvas_sizer)
self.Show()
class App(wx.App):
def OnInit(self):
win = Window(title="A test dialog", size=(1000, 800))
win.Show()
return True
if __name__ == "__main__":
app = App()
app.MainLoop()
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