VerySimpleDrawing

Introduction

The "Hello, World" of drawing on windows.

What Objects are Involved?

wx.PaintDC - DeviceContext to draw on, in response to EVT_PAINT.
wx.Pen - Pen to draw with.

Process Overview

Draw on a wx.PaintDC with a wx.Pen in response to wx.EVT_PAINT.

Special Concerns

Read more RecipesImagesAndGraphics to learn more and extend beyond the limit.

Code Sample

import wx

class DrawPanel(wx.Frame):

    """Draw a line to a panel."""

    def __init__(self):
        wx.Frame.__init__(self, title="Draw on Panel")
        self.Bind(wx.EVT_PAINT, self.OnPaint)

    def OnPaint(self, event=None):
        dc = wx.PaintDC(self)
        dc.Clear()
        dc.SetPen(wx.Pen(wx.BLACK, 4))
        dc.DrawLine(0, 0, 50, 50)

app = wx.App(False)
frame = DrawPanel()
frame.Show()
app.MainLoop()

Another Way

import wx

app = wx.App(False)

frame = wx.Frame(None, title="Draw on Panel")
panel = wx.Panel(frame)

def on_paint(event):
    dc = wx.PaintDC(event.GetEventObject())
    dc.Clear()
    dc.SetPen(wx.Pen("BLACK", 4))
    dc.DrawLine(0, 0, 50, 50)

panel.Bind(wx.EVT_PAINT, on_paint)

frame.Show(True)
app.MainLoop()

This doesn't create your own class, but you probably will want to. Notice that the paint function takes only one argument here, not two.