Dweets awesomed by u/indygon

function u(t) {

c.width=1920 // clear the canvas
for(i=0;i<9;i++)
x.fillRect(400+i*100+S(t)*300,400,50,200) // draw 50x200 rects

} // 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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indygon

function u(t) {

x.reset();s=400;for(j=1;j<13;j++){for(i=0;i<3*s;i++){c=255-j*30
x.fillStyle=R(c,c,c)
x.fillRect(i*S(j/2+i*t/s)+960,i*C(j/2+i*t/s)+540,9,9)}}

Feb 11 2024 3:31 AM UTC

}// 140/140

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zoetrope

u/indygon

aka "enter the headache vortex"
u/indygon

Here's an pre-golfed version with some parameters in the first line if anyone wants to mess around with it: x.reset();a=1e3;s=300;p=2*Math.PI;n=12 for(j=1;j<n+1;j++){ for(i=0;i<a;i++){ c=200-j*20 x.fillStyle=R(c,c,c) x.fillRect(1.5*i*S(j*p/n+i*t/s)+960,1.5*i*C(j*p/n+i*t/s)+540,9,9)}}

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tomxor

function u(t) {

eval(unescape(escape`𩡯𬠨𭀿𭰽𨰮𭱩𩁴𪀦👩🐸𜰲𜀺𚁁👂🐸𛁕👖🐰𚐻𪐭𛐻𪰽𥀦𤠼𝐿𛠲𝐭𤠯𜠰𞠰𛁕𛐽𪰪𨐬𥠭👫𚡢𚑸𛡦𪑬𫁒𩑣𭀨𦀽𪐥𭰬𦐽𪐯𭰬𜐬𥁼𤠼𝐩𛁔👓𚁘𛰶𚐫𠰨𦐯𝠩𚱙𛰶🠸𛁒👍𨑴𪀮𪁹𬁯𭀨𨐽𦀭𠐬𨠽𦐭𠠩𞱁𚰽𥐬𠠫👖𛁁𚰽𭰬𠐥👷𛁖𚰽𛠱𜠵`.replace(/u../g,'')))

Jul 28 2021 12:08 AM UTC

}// 134/140

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Impossible Marble #Physics

u/tomxor

Inspired by d/23398. Uses raster/2d-voxel based intersection
u/Xen

love it!
u/magna

HOW?!
u/katkip

how
u/tomxor

It's particle physics, but the collisions are with implicit volumes. So rather than checking against a specific object, each pixel is intersected with the circle, if the pixel is filled and intersects, then it contributes velocity to the particle along the collision normal (the vector between the pixel and the point), the deeper the intersection based on the radius the greater the contribution... this is not correct at all and creates lots of phantom momentum, but is very simple and shares the code with drawining the screen.

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anotherkitten

function u(t) {

x.fillStyle=R(a=16+S(t/5)*9,3,30-a,.03)
x.fillRect(0,0,2e3,2e3)
for(i=900;i--;x.clearRect(960+S(i)*(j%90)*20,540+C(i)*(j%90)*30,9,9))j=i+t*t

Feb 13 2019 11:20 PM UTC

}// 140/140

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some sexy spirals in this #waitforit

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