ScrolledBitmap.py

#!/usr/bin/env python

"""
Putting an image in a Scrolled Window

And drawing something over it.
"""

import wx

# set an image file here
img_filename = 'Images/white_tank.jpg'


class MyCanvas(wx.ScrolledWindow):
 def __init__(self, *args, **kwargs):
 wx.ScrolledWindow.__init__(self, *args, **kwargs)

 self.bmp = wx.Image(img_filename).ConvertToBitmap()

 self.maxWidth, self.maxHeight = self.bmp.GetWidth(), self.bmp.GetHeight()

 self.SetScrollbars(20, 20, self.maxWidth / 20, self.maxHeight / 20)

 self.Bind(wx.EVT_PAINT, self.OnPaint)

 # an arbitrary rect to draw -- in pixel coords of the image
 self.rect = (200, 200, 300, 200) # x, y, width, height

 def OnPaint(self, event):
 dc = wx.PaintDC(self)
 self.PrepareDC(dc)

 dc.SetPen(wx.Pen(wx.RED, 2))
 dc.SetBrush(wx.Brush((255, 255, 255, 85)))

 dc.DrawBitmap(self.bmp, 0, 0)
 dc.DrawRectangle(*self.rect)


class TestFrame(wx.Frame):
 def __init__(self, *args, **kwargs):
 wx.Frame.__init__(self, *args, **kwargs)

 self.Bind(wx.EVT_CLOSE, self.OnCloseWindow)

 self.Canvas = MyCanvas(self)

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


class App(wx.App):
 def OnInit(self):
 frame = TestFrame(None, title="Scroll Test", size=(800, 700))
 self.SetTopWindow(frame)
 frame.Show(True)
 return True


if __name__ == "__main__":
 app = App(False)
 app.MainLoop()