I'm working on a drawing tool.  I've ported some code
over from TCL and there's one line that doesn't seem to
be working correctly.

I've attached the original TCL.  I'm also attaching the
Python that doesn't seem to work exactly right.

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The line that doesn't seem to work is in the function
StrokeEnd(event)...
   
canvas.create_line(coords,tag='line',arrow=LAST,joinstyle=ROUND,smooth=TURN_ON)

coords is a list built from x,y tuples e.g.

  [ (0,0), (1,1), (2,2) ]

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I'm running Windows 2000 SP4.

Not sure what the expected behavior is, or if the bug is in OP's code.

Hi Brian (hope you are still there), the code in 31_8.tcl is not
complete so I didn't bother looking into it.

The tkdraw.py is not really correct, here is a cleaned up version that
works:

from Tkinter import Tk, Canvas, LAST, ROUND

def StrokeBegin(event):
    print "clicked at", event.x, event.y
    del stroke[:]
    tuple = (event.x, event.y)
    stroke.append(tuple)

def Stroke(event):
    tuple = (event.x, event.y)
    coords = stroke[len(stroke)-1] + tuple

    stroke.append(tuple)
    canvas.create_line(coords, tag='segments')

def StrokeEnd(event):
    canvas.delete('segments')
    if len(stroke) < 2:
        # Just a click happened
        return

    canvas.create_line(stroke, tag='line', arrow=LAST,
            joinstyle=ROUND, smooth=1)

stroke = []

root = Tk()
canvas = Canvas(root, height=400, width=500)
canvas.bind("<Button-1>", StrokeBegin)
canvas.bind("<B1-Motion>", Stroke)
canvas.bind("<ButtonRelease-1>", StrokeEnd)
canvas.pack()
root.mainloop()