How to draw text in a bitmap using wxpython?

Question

I want to draw a number centered inside a wx.EmptyBitmap.

How can I do it using wxpython?

Thanks in advance :)

import wx

app = None

class Size(wx.Frame):
    def __init__(self, parent, id, title):
        frame = wx.Frame.__init__(self, parent, id, title, size=(250, 200))
        bmp = wx.EmptyBitmap(100, 100)
        dc = wx.MemoryDC()
        dc.SelectObject(bmp)
        dc.DrawText("whatever", 50, 50)
        dc.SelectObject(wx.NullBitmap)
        wx.StaticBitmap(self, -1, bmp)
        self.Show(True)


app = wx.App()
Size(None, -1, 'Size')
app.MainLoop()

This code only gives me a black image, what am I doing wrong? What's missing here..

you need to clear the bitmap to the appropriate colour, and draw the text in the appropriate colour... — Will
– Will, Commented Apr 6, 2010 at 12:50

Anurag Uniyal · Accepted Answer · 2010-04-06 13:17:51Z

5

Select the bmp in a wx.MemoryDC, draw anything on that dc and then select that bitmap out e.g.

import wx

app = None

class Size(wx.Frame):
    def __init__(self, parent, id, title):
        frame = wx.Frame.__init__(self, parent, id, title, size=(250, 200))
        w, h = 100, 100
        bmp = wx.EmptyBitmap(w, h)
        dc = wx.MemoryDC()
        dc.SelectObject(bmp)
        dc.Clear()
        text = "whatever"
        tw, th = dc.GetTextExtent(text)
        dc.DrawText(text, (w-tw)/2,  (h-th)/2)
        dc.SelectObject(wx.NullBitmap)
        wx.StaticBitmap(self, -1, bmp)
        self.Show(True)


app = wx.App()
app.MainLoop()

edited Apr 6, 2010 at 13:17

answered Apr 6, 2010 at 9:26

Anurag Uniyal

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2 Comments

aF. Over a year ago

Anurag, can you tell me what is wrong with the code that I posted plz :)

Anurag Uniyal Over a year ago

@aF, i have updated code, so now dc is cleared and I calculate the correct vertical and horizontal centered position for text

Will · Accepted Answer · 2010-04-06 08:49:39Z

1

You use a wx.MemoryDC

answered Apr 6, 2010 at 8:49

Will

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1 Comment

Steven Sproat Over a year ago

There are LOADS of examples in the wxPython demos. just a heads up

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