On Tue, Jun 19, 2018 at 1:40 PM, Andre Roberge <andre.robe...@gmail.com> wrote:
> HI, > > There seems to be a lot of misunderstanding about this issue. Hopefully, > the following can help clear it up. > > 0. The turtle module includes functions named left() and right() which > result in the turtle rotating in the corresponding direction on the screen. > 1. The turtle implementation includes a function, setworldcoordinates(), > which allows one to have user-defined coordinates (both for the width and > height of the world) including a choice as to which in which direction the > coordinates are increasing. The issue has nothing to do with what choice > is "best"; any user is free to use whatever they want. > 2. In the current implementation, if one choses some particular > orientation for the coordinates, the role of left() and right() are > inverted and no longer correspond to what the user sees on the screen. > > The submitted fix simply ensures that, no matter what one chooses for the > world coordinates via setworldcoordinates, when right() is called in a > program, the turtle turns right and not left. > > André > Ah. Then I did indeed misunderstand the point. And now I'm of two minds as to whether or not the fix is a fix. I see it as an option, but I also see the argument that sprites, avatars, turtles, etc, often are designed with a "head" and a "tail". So, it's back to the whole "stage left" vs. "left" argument: Are we talking about the virtual creature's left or the viewer's left? (Or am I misunderstanding yet again? If I'm not misunderstanding, I would say "Make it a configuration or startup option, or attribute of setworldcoordinates, or some such." For me, if I'm giving you directions to my apartment, and say in e-mail "Turn left" I would expect you to turn to your left, even if you knew which direction I was currently facing. I would expect an avatar to turn to its left regardless of my viewing angle.) -- *Kevin Cole* <http://novawebdevelopment.org> NOVA Web Development Co-Op http://novawebdevelopment.org/ Arlington, VA
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