[wxPython] wxImage bitmap sample code

[John Hunter]

Does someone have a snippet of code illustrating how to load a bitmap
and display it in a frame using wxPython

I am new to wxPython and haven't got the relationship between wxImage,
wxDC, wxBitMap, wxDC::Blit and wxFrame all sorted out. I think if I
could see an example where a bitmap (or other image format) was loaded
from disk and displayed in a window, it would help me along.

What I understand crudely is that you load an image like

image = wxImage('plane_A.bmp')

This has to be converted to a wxBitmap, which is then drawn into a
device context with wxDC::DrawBitmap and then this DC can be used to
draw it into your frame....

John Hunter

[Robin Dunn]

>
> Does someone have a snippet of code illustrating how to load a bitmap
> and display it in a frame using wxPython

wxPython/lib/splashscreen.py is one example.

--
Robin Dunn
Software Craftsman
ro...@AllDunn.com Java give you jitters?
http://wxPython.org Relax with wxPython!

[Bob Klimek]

At 11:10 AM 11/6/2001 -0600, you wrote:

>Does someone have a snippet of code illustrating how to load a bitmap
>and display it in a frame using wxPython

this might help.
Bob

from wxPython.wx import *

ID_FILE_OPEN = 101
ID_FILE_EXIT = 103

class ImagePanel(wxPanel):
def __init__(self, parent, id):
wxPanel.__init__(self, parent, id)
self.image = None
EVT_PAINT(self, self.OnPaint)

def display(self, image):
self.image = image
self.Refresh(true)

def OnPaint(self, evt):
dc = wxPaintDC(self)
if self.image:
dc.DrawBitmap(self.image.ConvertToBitmap(), 0,0)

#----------------------------------------------------------------------

class MyFrame(wxFrame):
def __init__(self, parent, ID, title):
wxFrame.__init__(self, parent, ID, title,
wxDefaultPosition,wxSize(500, 400))

self.iPanel = ImagePanel(self, -1)
self.im = None

# Construct "File" menu
self.menuBar = wxMenuBar()
self.menuFile = wxMenu()
self.menuFile.Append(ID_FILE_OPEN, "&Open image","")
EVT_MENU(self, ID_FILE_OPEN, self.OnOpen)
self.menuFile.AppendSeparator()
self.menuFile.Append(ID_FILE_EXIT, "E&xit", "")
EVT_MENU(self, ID_FILE_EXIT, self.OnExit)
self.menuBar.Append(self.menuFile, "&File");
self.SetMenuBar(self.menuBar)

wxInitAllImageHandlers() # loads all available image handlers
(image types)

def OnOpen(self, event):
f1 = 'All image files (tif, bmp, jpg, gif, png...)| \
*.tif;*.bmp;*.jpg;*.png;*.pcx;*.gif;*.pnm'
fileTypes = f1
fd = wxFileDialog(self, "Open Image", "", "", fileTypes, wxOPEN)

if fd.ShowModal() == wxID_OK:
path = fd.GetPath()
self.LoadImage(path)
fd.Destroy()

def LoadImage(self, path):
try:
self.im = wxImage(path, wxBITMAP_TYPE_BMP) # this would also work
#self.im = wxNullImage()
self.im.LoadFile(path, wxBITMAP_TYPE_ANY) # autodetects the format
self.iPanel.display(self.im)
return true
except IOError:
print "can't open the file"
return false

def OnCloseWindow(self, event):
self.Destroy()

def OnExit(self, event):
self.Close(true)

#---------------------------------------------------------------------------

class MyApp(wxApp):
def OnInit(self):
frame = MyFrame(NULL, -1, "wxNoPilSimple")
frame.Show(true)
self.SetTopWindow(frame)
return true

app = MyApp(0)
app.MainLoop()