Color Skill Tester using WxPython

# Colour Matching Skill Tester
# compare the color set by the computer with your own slider operated perception
# adopted from vegaseat's slider code by HAB
# tested on a Windows XP computer with Python 2.4

import random
import wx

class MyPanel(wx.Panel):
    """ class MyPanel creates a panel with 2 labels, 3 sliders, inherits wx.Panel """
    def __init__(self, parent, id):
        wx.Panel.__init__(self, parent, id)
        self.SetBackgroundColour("white")
        str1 = ""
        
        self.Red1 = random.randrange(256)
        self.Green1 = random.randrange(256)
        self.Blue1 = random.randrange(256)
        # label1 with random RGB colour values
        self.label1 = wx.StaticText(self, -1, str1 , (10, 10), (120, 100))
        self.label1.SetBackgroundColour((self.Red1, self.Green1, self.Blue1))
        
        self.Red2 = 125
        self.Green2 = 125
        self.Blue2 = 125
        # label2 with RGB colour values from sliders
        self.label2 = wx.StaticText(self, -1, str1 , (10, 120), (120, 100))
        self.label2.SetBackgroundColour((self.Red2, self.Green2, self.Blue2))
        
        # init value = 125, min value = 0, max value = 255 for colours
        self.sliderR = wx.Slider(self, -1, self.Red2, 0, 255, (140, 10), (50, 200),
            wx.SL_VERTICAL | wx.SL_AUTOTICKS | wx.SL_LABELS)
        wx.StaticText(self, -1, "Red" , (160, 205))
        self.sliderG = wx.Slider(self, -1, self.Green2, 0, 255, (200, 10), (50, 200),
            wx.SL_VERTICAL | wx.SL_AUTOTICKS | wx.SL_LABELS)
        wx.StaticText(self, -1, "Green" , (220, 205))
        self.sliderB = wx.Slider(self, -1, self.Blue2, 0, 255, (260, 10), (50, 200),
            wx.SL_VERTICAL | wx.SL_AUTOTICKS | wx.SL_LABELS)
        wx.StaticText(self, -1, "Blue" , (280, 205))
        
        # result labels
        self.label3 = wx.StaticText(self, -1, "", (160, 230))
        self.label4 = wx.StaticText(self, -1, "", (10, 265))

        # all three sliders ...
        self.Bind(wx.EVT_SCROLL, self.slideColour)
       
        # button click
        self.button1 = wx.Button(self, -1, "Evaluate", (10, 230))
        self.button1.Bind(wx.EVT_BUTTON, self.button1Click)
        
    def slideColour(self, event):
        self.Red2 = self.sliderR.GetValue()
        self.Green2 = self.sliderG.GetValue()
        self.Blue2 = self.sliderB.GetValue()
        colour1 = wx.Colour(self.Red2, self.Green2, self.Blue2)
        
        # This does the trick, thanks to Peter K. !!!
        self.label2.ClearBackground()
        self.label2.SetBackgroundColour(colour1)
    
    def button1Click(self,event):
        str1 = "Upper  R=%d G=%d B=%d" % (self.Red1, self.Green1, self.Blue1)
        str2 = "Lower  R=%d G=%d B=%d" % (self.Red2, self.Green2, self.Blue2)
        diffR = self.Red1-self.Red2
        diffG = self.Green1-self.Green2
        diffB = self.Blue1-self.Blue2
        str3 = "Diff.  R=%d G=%d B=%d" % (diffR, diffG, diffB)
        self.label3.SetLabel(str1 + '\n' + str2 + '\n' + str3)
        # total up the differences ...
        diffTot = abs(diffR) + abs(diffG) + abs(diffB)
        if diffTot < 20:
            self.label4.SetLabel("very good")
        elif diffTot < 40:
            self.label4.SetLabel("good")
        elif diffTot < 60:
            self.label4.SetLabel("satisfactory")
        elif diffTot < 90:
            self.label4.SetLabel("just passed")
        else:
            self.label4.SetLabel("try it again")


app = wx.PySimpleApp()
frame = wx.Frame(None, -1, "Colour Skill Tester V1.1 HAB", size = (350, 330))
MyPanel(frame,-1)
frame.Show(True)
app.MainLoop()