dwitter.net | tomxor (2707)

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function u(t) {
} //
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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.
Theme challenge of the month: #fracture
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remix of d/21820 by u/erin

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  • u/erin
    this is amazing!
  • u/tomxor
    Thanks man :) I like the idea
  • u/erin
    i'm the type of person to come up with stuff by just messing with values.. so i kinda found myself making something similar to waves in a ocean and then i further explored the idea
  • u/erin
    maybe this is why my dweets are so remixable.. they're fun to insert functions into :)

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remix of d/21783 by u/tomxor

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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).

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remix of d/21734 by u/tomxor

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remix of d/21704 by u/tomxor

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remix of d/12335 by u/tomxor

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  • u/tomxor
    With subpixel anti-aliasing :) ... ok that was an accident... but atand back and look at those cute RGB fringes!

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  • u/tomxor
    I felt that there are too many extremely unecessarily long examples of xorshift32 implementations out there, with lots of fluff around the outside. It's a very nice and simple little PRNG and this is all the code you need to turn it into a unit interval (i.e the type and range you get from Math.random()): (x>>>0) * 2**-32. This conversion method is far from perfect and results in some bias, but so does the PRNG itself...

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remix of d/21621 by u/tomxor

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