The wxPython tutorial

Creating custom widgetshttp://www.zetcode.com/wxpython/customwidgets/self.Centre()self.Show(True)def OnScroll(self, event):self.sel = event.GetInt()self.cpu.Refresh()app = wx.App()CPUWidget(None, -1, 'cpu')app.MainLoop()Creating this widget is quite simple. We create a black panel. Then wedraw small rectangles onto this panel. The color of the rectangles dependon the value of the slider. The color can be dark green or bright green.dc.SetDeviceOrigin(0, 100)dc.SetAxisOrientation(True, True)Here we change the default coordinate system to cartesian. This is tomake the drawing intuitive.pos = self.parent.GetParent().GetParent().selrect = pos / 5Here we get the value of the sizer. We have 20 rectangles in eachcolumn. The slider has 100 numbers. The rect parameter makes aconvertion from slider values into rectangles, that will be drawn in brightgreen color.for i in range(1, 21):if i > rect:dc.SetBrush(wx.Brush('#075100'))dc.DrawRectangle(10, i*4, 30, 5)dc.DrawRectangle(41, i*4, 30, 5)else:dc.SetBrush(wx.Brush('#36ff27'))dc.DrawRectangle(10, i*4, 30, 5)dc.DrawRectangle(41, i*4, 30, 5)Here we draw 40 rectangles, 20 in each column. If the number of therectangle being drawn is greater than the converted rect value, we drawit in a dark green color. Otherwise in bright green.8 de 9 27/04/2008 1:07