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examples/kiva/wx_image_viewer.py

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import wx

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import sys

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import os

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from enthought.kiva import Canvas

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from enthought.kiva.agg import GraphicsContextArray

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from enthought.kiva.backend_image import Image

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#Event ID numbers

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ID_OPEN = 101

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ID_QUIT = 102

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class ImageCanvas(Canvas):

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    def __init__(self, parent, id=-1, size=wx.DefaultSize):

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        Canvas.__init__(self, parent, id, size=size)

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        # Until we have an image, use a blank GraphicsContextArray

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        self.img = GraphicsContextArray((800, 600))

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        return

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    def load_image(self, filename):

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        # Create a new Image object for the new file and then make wx repaint the window

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        self.img = Image(filename)

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        self.dirty = 1

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        self.Refresh()

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    def do_draw(self, gc):

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        # Use Image's abillity to draw itself onto a gc to paint the window

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        gc.draw_image(self.img, (0,0,self.img.width(), self.img.height()))

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class ImageViewerWindow(wx.Frame):

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    def __init__(self, id=-1, title="Image Viewer", size=(800,600)):

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        parent = None

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        wx.Frame.__init__(self, parent, id, title, size=size)

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        # Setup the menubar and file menu

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        filemenu = wx.Menu()

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        filemenu.Append(ID_OPEN, "&Open", "Open an image file to view")

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        filemenu.Append(ID_QUIT, "&Quit", "Quit the program")

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        menubar = wx.MenuBar()

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        menubar.Append(filemenu, "&File")

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        self.SetMenuBar(menubar)

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        # Register the event IDs for each menu item to call the appropriate function

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        wx.EVT_MENU(self, ID_QUIT, self.onQuit)

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        wx.EVT_MENU(self, ID_OPEN, self.onOpen)

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        #Create an ImageCanvas to hold the image

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        self.canvas = ImageCanvas(self)

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        self.Show(1)

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        return

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    def onQuit(self, e):

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        sys.exit()

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    def onOpen(self, e):

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        #Create a file dialog

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        dlg = wx.FileDialog(

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            self, message = "Choose an image", defaultDir = os.getcwd(),

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            defaultFile = "", wildcard = "All Files (*.*)|*.*",

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            style=wx.OPEN | wx.CHANGE_DIR

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            )

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        #Show it modally.  If the user clicks OK, have the ImageCanvas load the

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        # new file.

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        if dlg.ShowModal() ==wx.ID_OK:

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            paths = dlg.GetPaths()

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            self.canvas.load_image(paths[0])

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if __name__ == "__main__":

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    class MyApp(wx.App):

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        def OnInit(self):

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            ImageViewerWindow(size=(800,600))

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            return 1

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    app = MyApp(0)

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    app.MainLoop()

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