Source code for Contrast

# This is a simple brightness/contrast manager for CellTracking
# MW Aug 2012 - GPLv3+
# Ported from CellTracking O.x to CellTracking 1.x 
# MW Jun 2013 - GPLv3+

import gtk, logging
#import cv
#from numpy import *

[docs]class State_contrast :
        def __init__(self) :
                self.hidden = False
                self.initiated = False
                self.auto_contrast = False
                self.current_contrast = 1.0

[docs]class Contrast :
        def __init__(self, state) :
                # Create a state for the contrast
                self.state = state
                self.state_contrast = State_contrast()
                self.state_contrast = self.state.add_subclass('contrast', self.state_contrast)

[docs]        def get_button(self) :
                self.button = gtk.MenuItem("Brightness/Contrast") # Find a real icon, not that
                self.button.connect('activate', self.hide_show_panel_evt)
                return self.button

[docs]        def hide_show_panel_evt(self, w) :
                self.hide_show_panel()
                return True
[docs]        def hide_show_panel(self, hide=None) :
                """hide=None means 'switch state'"""
                if ((hide or (not self.state_contrast.hidden and hide==None)) and self.state_contrast.initiated) : # Hide a displayed panel
                        self.window.hide()
                        self.state_contrast.hidden = True
                elif ((not hide or (self.state_contrast.hidden and hide==None)) and self.state_contrast.initiated) :
                        self.window.show()
                        self.state_contrast.hidden = False
                elif ((self.state_contrast.hidden or not hide)  and not self.state_contrast.initiated) : # Create a new display
                        # Window
                        self.window = gtk.Window()
                        self.window.set_title("B&C")
                        self.window.connect("delete-event", self.hide_show_change)
                        self.panel = gtk.HBox()

                        # Buttons
                        self.panel.pack_start(gtk.Label('Contrast:'))
			b_minus = gtk.Button('-')
                        b_minus.connect('clicked', self.change_contrast_evt, -1)
                        self.panel.pack_start(b_minus, fill=False, expand=False)

			b_plus = gtk.Button('+')
                        b_plus.connect('clicked', self.change_contrast_evt, +1)
                        self.panel.pack_start(b_plus, fill=False, expand=False)

			b_auto = gtk.Button('Auto')
                        b_auto.connect('clicked', self.auto_contrast_evt)
                        self.panel.pack_start(b_auto, fill=False, expand=False)

			b_reset = gtk.Button('Reset')
                        b_reset.connect('clicked', self.reset_contrast_evt)
                        self.panel.pack_start(b_reset, fill=False, expand=False)

                        self.window.add(self.panel)
            
                        self.window.show_all()
                        self.state_contrast.initiated = True
                        self.state_contrast.hidden = False
                else :
                        logging.error("This case in hide_show_panel had never been considered. Fatal.")

[docs]        def change_contrast_evt(self, w, incr) :
                self.state_contrast.current_contrast += incr
                #print self.state_contrast.current_contrast
[docs]        def reset_contrast_evt(self, w) :
                """Function called to reset contrast to 1
                also unselects the auto contrast"""
                self.state_contrast.current_contrast = 1
                self.state_contrast.auto_contrast = False
[docs]        def auto_contrast_evt(self, w) :
                self.state_contrast.auto_contrast = not  self.state_contrast.auto_contrast

[docs]        def hide_show_change(self, q, qq=None) :
                self.hide_show_panel(hide=True)
                return True
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