#!/usr/bin/env python

"""

Simple app that demonstrates how to use a wx.StaticBitmap, specifically

replacing bitmap dynamically.

Note: there needs to be an "Images" directory with one or more jpegs in it in the

current working directory for this to work

Test most recently on OS-X wxPython 2.9.3.1

But it been reported to work on lots of other platforms/versions

"""

import wx, os

print "running wx version:", wx.__version__

class TestFrame(wx.Frame):

def __init__(self, *args, **kwargs):

wx.Frame.__init__(self, *args, **kwargs)

# there needs to be an "Images" directory with one or more jpegs in it in the

# current working directory for this to work

self.jpgs = GetJpgList("./Images") # get all the jpegs in the Images directory

self.CurrentJpg = 0

self.MaxImageSize = 200

b = wx.Button(self, -1, "Display next")

b.Bind(wx.EVT_BUTTON, self.DisplayNext)

# starting with an EmptyBitmap, the real one will get put there

# by the call to .DisplayNext()

self.Image = wx.StaticBitmap(self, bitmap=wx.EmptyBitmap(self.MaxImageSize, self.MaxImageSize))

self.DisplayNext()

# Using a Sizer to handle the layout: I never use absolute positioning

box = wx.BoxSizer(wx.VERTICAL)

box.Add(b, 0, wx.CENTER | wx.ALL,10)

# adding stretchable space before and after centers the image.

box.Add((1,1),1)

box.Add(self.Image, 0, wx.ALIGN_CENTER_HORIZONTAL | wx.ALL | wx.ADJUST_MINSIZE, 10)

box.Add((1,1),1)

self.SetSizerAndFit(box)

wx.EVT_CLOSE(self, self.OnCloseWindow)

def DisplayNext(self, event=None):

# load the image

Img = wx.Image(self.jpgs[self.CurrentJpg], wx.BITMAP_TYPE_JPEG)

# scale the image, preserving the aspect ratio

W = Img.GetWidth()

H = Img.GetHeight()

if W > H:

NewW = self.MaxImageSize

NewH = self.MaxImageSize * H / W

else:

NewH = self.MaxImageSize

NewW = self.MaxImageSize * W / H

Img = Img.Scale(NewW,NewH)

# convert it to a wx.Bitmap, and put it on the wx.StaticBitmap

self.Image.SetBitmap(wx.BitmapFromImage(Img))

# You can fit the frame to the image, if you want.

#self.Fit()

#self.Layout()

self.Refresh()

self.CurrentJpg += 1

if self.CurrentJpg > len(self.jpgs) -1:

self.CurrentJpg = 0

def OnCloseWindow(self, event):

self.Destroy()

def GetJpgList(dir):

jpgs = [f for f in os.listdir(dir) if f[-4:] == ".jpg"]

# print "JPGS are:", jpgs

return [os.path.join(dir, f) for f in jpgs]

class App(wx.App):

def OnInit(self):

frame = TestFrame(None, -1, "wxBitmap Test", wx.DefaultPosition,(550,200))

self.SetTopWindow(frame)

frame.Show(True)

return True

if __name__ == "__main__":

app = App(0)

app.MainLoop()