This recipe provides a small app that demonstrates some of the basics of using a wx.StaticBitmap, particularly how to change the bitmap displayed.
What Objects are Involved
- The main point of this recipe
- Used to load images of various types: JPEG etc.
The native bitmap type used to draw stuff to the screen: needed to put a bitmap on wx.StaticBitmap
The recipe puts a wx.StaticBitmap on a wx.Frame and provides a wx.Button that changes the image.
- Tested on OS-X with Python2.5 and wxPython 2.8, but it is little changed form older versions that worked on 2.5.*
- NOTE: There have been reports that it works on Linux and Windows as well.
- You need to create a directory called "Images" with at least one jpeg in it.
""" 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 184.108.40.206 But it been reported to work on lots of other platforms/versions """ import wx, os 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()
Please test this out on other platforms and/versions. If it doesn't work find a fix and correct it here, or send me a note:
Change due to wx API( newer wxPython include a wx.Window.MaxSize attribute. Found and corrected by Ross Marsden
OS-X: wxPython 220.127.116.11 (Cocoa)
- wxPython 18.104.22.168 (Carbon)
WindowsXP: wxPython 22.214.171.124