Pmw/Pmw_1_2/demos/Spectrum.py

   1 title = 'Color spectrum demonstration'
   2
   3 # Import Pmw from this directory tree.
   4 import sys
   5 sys.path[:0] = ['../../..']
   6
   7 import string
   8 import Tkinter
   9 import Pmw
  10
  11 class Demo:
  12     def __init__(self, parent):
  13         parent = Tkinter.Frame(parent)
  14         parent.pack(padx=10, pady=10, fill='both', expand=1)
  15         self.width = 350
  16         self.height = 250
  17         self.canvas = Tkinter.Canvas(parent,
  18                 width = self.width, height = self.height)
  19         self.canvas.grid(row = 0, column = 0, columnspan = 2, sticky = 'news')
  20
  21         self.numColors = Pmw.EntryField(parent,
  22                 labelpos = 'w',
  23                 label_text = 'Number of colors:',
  24                 entry_width = 5,
  25                 validate = 'numeric',
  26                 command = Pmw.busycallback(self.execute))
  27         self.numColors.grid(row = 1, column = 0, sticky = 'ew')
  28
  29         self.correction = Pmw.EntryField(parent,
  30                 labelpos = 'w',
  31                 label_text = 'Correction:',
  32                 validate = 'real',
  33                 entry_width = 5,
  34                 command = Pmw.busycallback(self.execute))
  35         self.correction.grid(row = 1, column = 1, sticky = 'ew')
  36
  37         self.saturation = Pmw.EntryField(parent,
  38                 labelpos = 'w',
  39                 label_text = 'Saturation:',
  40                 validate = 'real',
  41                 entry_width = 5,
  42                 command = Pmw.busycallback(self.execute))
  43         self.saturation.grid(row = 2, column = 0, sticky = 'ew')
  44
  45         self.intensity = Pmw.EntryField(parent,
  46                 labelpos = 'w',
  47                 label_text = 'Intensity:',
  48                 validate = 'real',
  49                 entry_width = 5,
  50                 command = Pmw.busycallback(self.execute))
  51         self.intensity.grid(row = 2, column = 1, sticky = 'ew')
  52
  53         self.extraOrange = Pmw.EntryField(parent,
  54                 labelpos = 'w',
  55                 label_text = 'Emphasize orange (0 or 1):',
  56                 validate = {'validator' : 'numeric', 'min' : 0, 'max' : 1},
  57                 entry_width = 5,
  58                 command = Pmw.busycallback(self.execute))
  59         self.extraOrange.grid(row = 3, column = 0, sticky = 'ew')
  60
  61         self.text = Pmw.EntryField(parent,
  62                 labelpos = 'w',
  63                 label_text = 'Text:',
  64                 entry_width = 20,
  65                 command = Pmw.busycallback(self.execute))
  66         self.text.grid(row = 4, column = 0, sticky = 'ew')
  67
  68         self.brightness = Pmw.EntryField(parent,
  69                 labelpos = 'w',
  70                 label_text = 'Brightness:',
  71                 validate = 'real',
  72                 entry_width = 5,
  73                 command = Pmw.busycallback(self.execute))
  74         self.brightness.grid(row = 3, column = 1, sticky = 'ew')
  75
  76         self.radiobuttons = Pmw.RadioSelect(parent,
  77                 command = Pmw.busycallback(self.radio_cb),
  78         )
  79         self.radiobuttons.grid(row = 4, column = 1)
  80         self.radiobuttons.add('Use saturation\nand intensity')
  81         self.radiobuttons.add('Use\nbrightness')
  82
  83         parent.grid_columnconfigure(0, weight = 1)
  84         parent.grid_columnconfigure(1, weight = 1)
  85         parent.grid_rowconfigure(0, weight = 1)
  86
  87         Pmw.alignlabels((self.numColors, self.saturation, self.extraOrange))
  88         Pmw.alignlabels((self.correction, self.intensity, self.brightness))
  89
  90         # Set initial values for all entries.
  91         self.numColors.setentry('64')
  92         self.correction.setentry('1.0')
  93         self.saturation.setentry('1.0')
  94         self.intensity.setentry('1.0')
  95         self.extraOrange.setentry('1')
  96         self.brightness.setentry('0.7')
  97         self.text.setentry('This is a test')
  98         self.radiobuttons.invoke('Use saturation\nand intensity')
  99
 100         self.execute()
 101
 102     def radio_cb(self, value):
 103         self.execute()
 104
 105     def execute(self):
 106         try:
 107             numColors = string.atoi(self.numColors.get())
 108             correction = string.atof(self.correction.get())
 109             saturation = string.atof(self.saturation.get())
 110             intensity = string.atof(self.intensity.get())
 111             extraOrange = string.atof(self.extraOrange.get())
 112             brightness = string.atof(self.brightness.get())
 113         except ValueError:
 114             self.numColors.bell()
 115             return
 116
 117         if numColors <= 0:
 118             self.numColors.bell()
 119             return
 120
 121         self.canvas.delete('all')
 122
 123         colorList = Pmw.Color.spectrum(
 124                 numColors, correction, saturation, intensity, extraOrange)
 125         extent = 360.0 / numColors
 126
 127         useBrightness = \
 128                 (self.radiobuttons.getcurselection() == 'Use\nbrightness')
 129
 130         if numColors == 1:
 131             # Special case circle, since create_arc does not work when
 132             # extent is 360.
 133             background = colorList[0]
 134             if useBrightness:
 135                 background = Pmw.Color.changebrightness(
 136                         self.canvas, background, brightness)
 137             self.canvas.create_oval(10, 10, self.width - 10, self.height - 10,
 138                 fill = background, outline = background)
 139
 140         for index in range(numColors):
 141             start = index * extent - extent / 2
 142             background = colorList[index]
 143             if useBrightness:
 144                 background = Pmw.Color.changebrightness(
 145                         self.canvas, background, brightness)
 146             self.canvas.create_arc(10, 10, self.width - 10, self.height - 10,
 147                 start = start, extent = extent,
 148                 fill = background, outline = background)
 149
 150         text = self.text.get()
 151         self.canvas.create_text(self.width / 2, self.height / 3, text = text)
 152         self.canvas.create_text(self.width / 2, self.height / 2, text = text)
 153         self.canvas.create_text(self.width / 2, 2 * self.height / 3, text = text)
 154
 155 ######################################################################
 156
 157 # Create demo in root window for testing.
 158 if __name__ == '__main__':
 159     root = Tkinter.Tk()
 160     Pmw.initialise(root)
 161     root.title(title)
 162
 163     exitButton = Tkinter.Button(root, text = 'Exit', command = root.destroy)
 164     exitButton.pack(side = 'bottom')
 165     widget = Demo(root)
 166     root.mainloop()