[Tutor] Fwd: Pi xels

[John Steedman]

I once dabbled with wxPython.  The code below may not run straight off as
I've cut it out of a bigger routine, but it may give you a flavour of a
basic (very basic) set up.

import wx

import math

def drawCircle (radius, canvas, strCol):

  centre = (100,100)
  cX = centre[0]
  cY = centre[1]

  dc = canvas
  dc.SetPen(wx.Pen(strCol, 5))

  x1 = 0
  y1 = math.sqrt ( math.pow (radius,2) - math.pow(x1, 2) )

  for x2 in range ( 1, radius + 1 , 1 ):

    y2 = math.sqrt ( math.pow (radius,2) - math.pow(x2, 2) )
    dc.DrawLine ( cX+ x1 , yCorr ( cY + y1 ), cX + x2, yCorr (cY + y2) )
    dc.DrawLine ( cX+ x1 , yCorr ( cY - y1 ), cX + x2, yCorr (cY - y2) )
    dc.DrawLine ( cX- x1 , yCorr ( cY + y1 ), cX - x2, yCorr (cY + y2) )
    dc.DrawLine ( cX- x1 , yCorr ( cY - y1 ), cX - x2, yCorr (cY - y2) )

    y1 = y2
    x1 = x2


def on_paint(event):
  dc = wx.PaintDC(event.GetEventObject())
  dc.Clear()
  drawCircle ( 50, dc, 'GREEN')


app = wx.App(False)


frame = wx.Frame(None, title="Draw on Panel")
panel = wx.Panel(frame)
panel.Bind(wx.EVT_PAINT, on_paint)
#panel.Bind(wx.EVT_LEFT_DOWN, on_mouseClick)

panel.SetFocusIgnoringChildren()
panel.Bind(wx.EVT_KEY_DOWN, on_KeyDown )

frame.Show(True)
app.MainLoop()
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