On Nov 12, 2010, at 8:48 PM, Brian Blais wrote:

On Nov 12, 2010, at 8:05 PM, Steven D'Aprano wrote:

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On Fri, 12 Nov 2010 19:24:50 -0500, Brian Blais wrote:

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I'd like to draw on a turtle canvas, but use the mouse to direct the turtle. I don't see a good way of getting the mouse coordinates and the button state.

I think the right way to do that is by creating an event handler to the turtle. These docs are for Python 2.7 turtle, but they may be applicable to older versions as well:

http://docs.python.org/library/turtle.html#turtle.ondrag

I quote:

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turtle.ondrag(turtle.goto)

Subsequently, clicking and dragging the Turtle will move it across the screen thereby producing handdrawings (if pen is down).

That's probably all you need to do.

that's what I tried first, with no luck. I am on 2.6 on Mac OSX (Enthought distribution). The following code:

import turtle

turtle.reset() turtle.speed(0) turtle.ondrag(turtle.goto) turtle.pendown()

running it in ipython brings up a window, but clicking, dragging, or anything like that doesn't move the turtle or draw anything. running it in just plain python brings up the window, but it instantly closes. I added: turtle.mainloop()

which keeps the window open, but the clicking or dragging still doesn't move the turtle or update the window in any way.

Here is code that "works", with at least one small oddity: import turtle def gothere(event): turtle.penup() turtle.goto(event.x-360,340-event.y) turtle.pendown() def movearound(event): turtle.goto(event.x-360,340-event.y) def release(event): turtle.penup() def reset(event): turtle.clear() turtle.reset() turtle.speed(0) c=turtle.getcanvas() c.bind("<Button-1>", gothere) c.bind("<B1-Motion>", movearound) c.bind("<ButtonRelease-1>", release) c.bind("<Escape>",reset) s=turtle.Screen() s.listen() the oddity is that the coordinate transformations, x-360 and 340-y, are done by eye and do not seem to be related to any of the coordinate values I could find. my screen size is 300x400, the x and y canvas scales are 1 and 1, but if I try to transform with those numbers the mouse is clearly off. any ideas? bb -- Brian Blais bblais@bryant.edu http://web.bryant.edu/~bblais http://bblais.blogspot.com/