multiple improvements : memory, functionality

[Marius-450]

multiple improvements : memory, functionality + consistency with documentation

See this repo for the full changelog.

• memory improvements : smaller background bitmap scaled to fullscreen and added a scale parameter to scale the "canvas".
• colors : +7 colors (for same memory consumption), background color management.
• mode is now implemented and consistent with documentation.
• Images : added set_bgpic() to display a bitmap as background, using OnDiskBitmap. Added changeturtle() to change the turtle shape via OnDiskBitmap or by passing a tilegrid object.
• Implemented : pensize(), speed(), reset() and some helpers like distance() or towards()
• Stamping of the turtle.
• Some details like fixing rounding errors in circle(), or improving dot()

The only problematic change i saw while testing all the example is the default heading to 0. I changed 4 examples to work as intended, by only setting heading to 90 once. Everything else worked out of the box, just a little slower due to the default speed value.

I removed the debug logger, and what seemed irrelevant or useless : event-based functions, undo buffer ... any comment is welcome about those.

On a 240x240 display, a turtle object use around 30500 Bytes with this version, versus 37500 Bytes previously. Using scale=2 the object use "only" 8900 Bytes of memory.

[ladyada]

thanks! if you can lint it, then we will test and merge :)

[Marius-450]

@ladyada : done ! all checks have passed.
I didn't find a lot of testers for the alpha version, but I tested a lot myself. I hope there is not a lot of bug...

[dhalbert]

This is great! I would just say to try to make it as much like the CPython library version https://docs.python.org/3/library/turtle.html as possible. I made one suggestion in that regard, though there may be others. I'm not that familiar with the original API, so for instance I see that changeturtle() is not in the original API. But maybe there is no equivalent for that.

[dhalbert]

This looks good to me! I tried some functions but not all, and it works fine.
@Marius-450 Maybe we will make this 2.0.0, since there are so many changes?
@ladyada any further comments?

[Marius-450]

I have no objection making this 2.0.0. do I need to change something for that ?

[dhalbert]

No, we'll make a release, no problem. But I just tried setting .pencolor and .bgcolor, and I'm still getting a white pen and a black background. Am I doing something wrong? (This is on a PyPortal)

>>> t.pencolor = Color.RED
>>> t.right(90)
>>> t.forward(100)
>>> t.pencolor = Color.YELLOW
>>> t.right(90)
>>> t.forward(100)

[dhalbert]

will wait for comments re color changing

color changing q

[Marius-450]

try t.pencolor(Color.RED) or t._pencolor = 2 

[dhalbert]

try t.pencolor(Color.RED) or t._pencolor = 2

OK, thanks, that's it, I'm too quick to try a property, and all I did was smash the method. :)