41–50 of 65 posts
Not really in the true spirit of turtle (if it doesn't "go forward" I don't count it!), but I had to make this one based on the MAD computer program discussed here yesterday. https://turtletoy.net/turtle/ba15abdde7
But I also like the approach here of using Turtle as a way to introduce JavaScript syntax. :)
I have seen this site some days ago (reddit maybe?) and I really like the concept! The design is very clean! One feature I'd like: A way to slow down the render so we can see the whole generation in slow-motion.
the async way doesn't seem to work inside the walk function, but the older (and uglier imo) way does
As an example here is the modified code for https://turtletoy.net/turtle/eed0f57234
// You can find the Turtle API reference here: https://turtletoy.net/syntax
Canvas.setpenopacity(1);
// Global code will be evaluated once.
const turtle = new Turtle();
turtle.penup();
turtle.goto(0,0);
turtle.pendown();
function sleep(ms) {
return new Promise(resolve => setTimeout(resolve, ms));
}
function pausecomp(millis)
{
var date = new Date();
var curDate = null;
do { curDate = new Date(); }
while(curDate-date Leigh Klotz was the man who ported MIT Logo to the Apple ][ and then the Commodore 64. According to him “The Commodore 64 CPU 6510 has a bidirectional parallel port at location 0 and 1, taking up 2 of the 256 "page zero" locations, which are the only ones you can indirect through. When I ported MIT Logo from the Apple II, there were lots of places that dereferenced nil without checking, and those caused crashes. Commodore gave me a chip they fabbed in qty 12 yield that brought out the I/D decide status as a pin, and we used a Nicolet-Paratronica logic analyzer to feed the address and data bus to a Pet running a BASIC disassembler. I could then set a breakpoint in-circuit to see the 256 instructions prior to or after the errant memory access, so I could go put on guard code...”
I got it from Jamie Zawinski's weblog. Be forewarned. Following the link from Hacker News will lead to an unsavory image. Just copy & paste it, instead.
https://www.jwz.org/blog/2018/11/weird-machines/#comment-192...
One feature that I wish existed was library import. Or community accepted set of extension modules. An easy way to call polar coordinates, Spirographs, matrix transforms, etc.
Of course Logo wasn't the most complex language ever but I remember being pretty pleased with myself having written a computer program on a bit of paper and it doing exactly what I'd visualised it to do.
I'm seeing some really interesting JavaScript techniques in the turtlevm.js[1] source. This line in particular stands out: const code = String(work).trim().split("{").slice(1).join("{").slice(0, - 1).trim().replace("/0/", _turtlevmapi).replace("/1/", strCode); It looks like the author is injecting the turtle code written by the user into a "work" function that removes dangerous objects (XMLHttpRequest, WebSocket, etc…
This reminds me of a story of how Logo was implemented on 8-bit microcomputers. Leigh Klotz was the man who ported MIT Logo to the Apple ][ and then the Commodore 64. According to him “The Commodore 64 CPU 6510 has a bidirectional parallel port at location 0 and 1, taking up 2 of the 256 "page zero" locations, which are the only ones you can indirect through. When I ported MIT Logo from the Apple II, there were lots…
http://www.dereferer.org/?https%3A%2F%2Fwww%2Ejwz%2Eorg%2Fbl...