## dwitter.net | TheYoungBard (754)

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`function u(t) {`
```} // 122/140 ```

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``` u(t) is called 60 times per second. t: Elapsed time in seconds. S: Shorthand for Math.sin. C: Shorthand for Math.cos. T: Shorthand for Math.tan. R: Function that generates rgba-strings, usage ex.: R(255, 255, 255, 0.5) c: A 1920x1080 canvas. x: A 2D context for that canvas. ```
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Current theme challenge: #ScaryMovies
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remix of d/21783 by u/tomxor

`function u(t) {`

```}// 140/140 ```

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• u/tomxor
Squashed each ant into a 16bit bit field, `[X,Y,D] = 0b 111111 111111 0111`. These ants were generated with: `X=7,Y=7,D=0,[[-X,-Y,3+D],[+Y,-X,2+D],[+X,+Y,1+D],[-Y,+X,0+D]].map(([X,Y,D])=>X+60<<10|Y+32<<4|D%4<<0)`
• u/mark1626
This is incredible. Just one question, how does `s = u[a >> 4] ^= 1` work?
• u/tomxor
Thanks :) `a>>4` is the cell index of a 64x64 grid. the lower 4 bits are for the ant's direction so shifting them off to the right leaves only the 12 X and Y bits (see above). `u` is just an object, so all of these indicies will be undefined initially, but undefined is falsey and bitwise operators coerce falsey into 0, i.e `undefined ^ 1 == 0 ^ 1 == 1`, in otherwords XOR just treats all of the initial cell values as 0. Using the assignment version `^=` means we toggle each cell between 0 and 1 each time an ant passes through it (which is part of the langton ant rules).

remix of d/21778 by u/erin

`function u(t) {`

```}// 43/140 ```

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• smallest Sierpinski i could come up with

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```}// 135/140 ```

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remix of d/739 by u/donbright

`function u(t) {`

```}// 79/140 ```

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`function u(t) {`

```}// 92/140 ```

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• Pretzel (Lissajous Curve)

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`function u(t) {`

```}// 131/140 ```

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• oil slick

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remix of d/15329 by u/tomxor

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```}// 125/140 ```

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• Chaos Photographer, Pic 1, Remix 1 #spiral

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• our Fours Puzzle V2 ~ How many integers between 0-100 can you form using only 4 4s and the +-*/.() operators? Example 1=44/44

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```}// 135/140 ```

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`function u(t) {`

```}// 123/140 ```

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• u/Xen
lots of nice dweets, keep up the good work!