On Tue, Jun 19, 2018 at 11:20 AM, Andre Roberge <andre.robe...@gmail.com> wrote:
> Is this Python's edu-sig or Monty Python's philosophers club? ;-) ;-) ;-) > > I do think we're branching out to discuss coordinate systems more generally, as a perennial feature of pedagogy. These more general concerns are distinct from turtle.py in particular. I hope contributors are not shy about continuing the higher level discussions. > Anyone on this list could probably do the following in less than one > minute... > > Yes, I just ran the following: >>> turtle.setworldcoordinates(0, -200, 400, 0) >>> turtle.forward(100) >>> turtle.right(90) >>> turtle.forward(100) >>> turtle.left(90) >>> turtle.forward(100) >>> Here's the resulting graphic output: https://flic.kr/p/28i3cDY However in this test, I did not isolate the problem. The turtle turns to its own right and then its own left. I'm assuming lower left is (0, -200) and upper right is (400, 0) i.e. Y still increases as we go vertically towards the top. I should change that... Lets make Y increasingly positive as we go down the screen. >>> turtle.setworldcoordinates(0,200,400,0) >>> turtle.forward(100) >>> turtle.left(90) >>> turtle.forward(100) >>> turtle.right(90) >>> turtle.forward(100) >>> turtle.right(90) Indeed, now I see the problem. The turtle no longer obeys it's own viewpoint but turns oppositely to what I command. Here's the graphic output this time: https://flic.kr/p/26ZJmQ2 Kirby
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