How to integrate mapnik with wxPython?

It is pretty easy to integrate mapnik with wxPython, here is a simple wxPython application demonstrates how to:

"""
This is a simple wxPython application demonstrates how to
integrate mapnik, it do nothing but draw the map from the World Poplulation XML
example:
http://trac.mapnik.org/wiki/XMLGettingStarted

Victor Lin. (bornstub@gmail.com)
Blog http://blog.ez2learn.com

"""

import wx
import mapnik

class Frame(wx.Frame):
    def __init__(self, *args, **kwargs):
        wx.Frame.__init__(self, size=(800, 500) ,*args, **kwargs)
        self.Bind(wx.EVT_PAINT, self.onPaint)

        self.mapfile = "population.xml"
        self.width = 800
        self.height = 500
        self.createMap()
        self.drawBmp()

    def createMap(self):
        """Create mapnik object

        """
        self.map = mapnik.Map(self.width, self.height)
        mapnik.load_map(self.map, self.mapfile)
        bbox = mapnik.Envelope(mapnik.Coord(-180.0, -75.0), mapnik.Coord(180.0, 90.0))
        self.map.zoom_to_box(bbox)

    def drawBmp(self):
        """Draw map to Bitmap object

        """
        # create a Image32 object
        image = mapnik.Image(self.width, self.height)
        # render map to Image32 object
        mapnik.render(self.map, image)
        # load raw data from Image32 to bitmap
        self.bmp = wx.BitmapFromBufferRGBA(self.width, self.height, image.tostring())

    def onPaint(self, event):
        dc = wx.PaintDC(self)
        memoryDC = wx.MemoryDC(self.bmp)
        # draw map to dc
        dc.Blit(0, 0, self.width, self.height, memoryDC, 0, 0)

if __name__ == '__main__':
    app = wx.App()
    frame = Frame(None, title="wxPython Mapnik Demo By Victor Lin")
    frame.Show()
    app.MainLoop()

The key point of this program is this:

# create a Image32 object
image = mapnik.Image(self.width, self.height)
# render map to Image32 object
mapnik.render(self.map, image)
# load raw data from Image32 to bitmap
self.bmp = wx.BitmapFromBufferRGBA(self.width, self.height, image.tostring())

We create an Image32 object, and render map on to that image, then load raw data of image into wxPython's Bitmap object. That's it! Now you can use your memory dc to do whatever you like

memoryDC = wx.MemoryDC(self.bmp)
# draw map to dc
dc.Blit(0, 0, self.width, self.height, memoryDC, 0, 0)

Screenshots