Dweets awesomed by u/pavel

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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Current theme challenge: #Opposites

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KilledByAPixel

remix of d/20939 by u/KilledByAPixel

function u(t) {

c.style.filter='invert('
for(t*=i=300;i--;x.fillText(j=i/12|0,j,j*S(j*j*t),3))x.setTransform(1,0,0,i%2*2-1,t*24%1980,t),x.rotate(i%12/1.908)

Dec 8 2020 5:55 AM UTC

}// 140/140

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#snowflake study #3

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KilledByAPixel

remix of d/20925 by u/KilledByAPixel

function u(t) {

for(t*=7200,i=420;i--;x.fillText(j=i/12|0,j,15*S(j*j*t),4))x.setTransform(d=C(a=i%12/.954),e=S(a),e*(q=i%12<6?-1:1),-d*q,t%1980,t/24)

Dec 8 2020 12:07 AM UTC

}// 133/140

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#snowflake study #2

u/pavel

x.rotate is shorter, as usual for(t*=7200,i=420;i--;x.fillText(j=i/12|0,j,15*S(j*j*t),4))x.setTransform(1,0,0,i%12<6?-1:1,t%1980,t/24),x.rotate(i%12/.954)
u/KilledByAPixel

Thanks! I will use that method for the next iteration

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pavel

function u(t) {

for(w=i=c.width|=0,x.globalAlpha=.15;i--;x.fillText('❄',-4,-4))x.setTransform(s=i*i%63/7,0,0,s,(i+s*w/(1+9**C(t/3)))%w,(s/5*t+T(i*i))%2*600)

Dec 6 2020 4:36 AM UTC

}// 140/140

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Snowstorm

u/donbright

lovely
u/KilledByAPixel

#snowflake

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pavel

remix of d/20901 by u/pavel

function u(t) {

for(i=c.width|=p=g=>(g(0)?k&3:k/4)*200+130*g(.8+(~~k+k/4&1||-1)*(i%120*41/13+5*t));k=--i/120;)x.fillRect(560+p(S),240+p(C),9,9)

Dec 4 2020 9:12 PM UTC

}// 127/140

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Moving #illusion

u/pavel

Discovered this randomly when golfing the original. Not sure why it happens.
u/danny@hille.dk

cool effect: the "feature" is caused by not truncating k=--i/120 -> k=--i/120|0 disables this feature :-)
u/KilledByAPixel

👍
u/danny@hille.dk

better solution: for(i=c.width|=p=g=>(g(0)?k&3:~~k/4)*200+150*g((k&1||-1)*(i%120*41/13+5*t));k=--i/120;)x.fillRect(560+p(S),240+p(C),9,9)

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pavel

function u(t) {

for(i=c.width|=0;i--;x.fillRect(X,540+200*C(a),-150,7))X=i%960*2,x.fillStyle=`hsl(${q=X/8+60*t},69%,${42+32*S(a=(q/32%1+(i>960))/.32)}%`

Dec 4 2020 8:45 PM UTC

}// 136/140

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Ribbons

u/pavel

Dynamically swapping the draw order to get proper overlapping. Change i>960 to 1 or 0 to see how this works.
u/Qwitter

cool, and thanks!

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pavel

remix of d/20898 by u/cantelope

function u(t) {

for(c.width=i=640;i--;T=!T&&!x.beginPath(x.stroke()))j=i/16-T*i&30,r=(j+4)/12<<6,x.arc(320+r*C(a=j/1.91+t),180+r*S(a),i&30?0:32,0,7)

Dec 4 2020 3:01 AM UTC

}// 132/140

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Metatron's Cube

Show more comments…
u/pavel

Golfed this one a little bit :) #symmetry
u/pavel

i=[4 bits for start circle index][4 bits for end circle index offset from start circle][1 bit to decide start vs end]
u/pavel

That's 2**9=512 which is too small for power-of-two circle sizes but start clicle index wraps around so larger i is only redundant.
u/pavel

end-circle-offset == 0 is easy to check and means start and end are same circle, so draw that circle.
u/pavel

Otherwise draw the current circle with radius 0 which is same as lineTo.
u/pavel

T=!T&&!x.beginPath(x.stroke()) starts/strokes the path every two circles.
u/pavel

Here is a version before all the bit hacking for(c.width=640,i=16;i--;)for(j=16;j--;x.beginPath(x.stroke()))for(k=2;k--;)q=(i+j*k)%16,r=((q+2)/6|0)*64,x.arc(320+r*C(a=Math.PI/3*q+t),180+r*S(a),!j*32,0,7)

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pavel

function u(t) {

for(i=c.width|=0;i--;x.fillRect(660+(p>>2)*200+130*C(a=Math.PI/4+(p+p/4&1||-1)*(369/13*d+3*t)),240+p%4*200+130*S(a),d,d))d=i%120/9,p=i/120|0

Dec 1 2020 8:51 PM UTC

}// 140/140

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#beesandbombs demake https://twitter.com/beesandbombs/status/1327…

u/rep_movsd

If you stare a bit, you see white lines completing the circles - an optical illusion
u/danny@hille.dk

save 9 bytes for(i=c.width|=0;i--;x.fillRect(660+(p>>2)*200+130*C(a=.8+(p+p/4&1||-1)*(28.4*d+3*t)),240+p%4*200+130*S(a),d,d))p=i/120|0,d=i%120/9
u/danny@hille.dk

120/9 = 40/3
u/danny@hille.dk

129 bytes -> for(m=120,i=c.width|=0;i--;x.fillRect(660+(p>>2)*200+m*C(a=.8+(p+p/4&1||-1)*(28.4*d+3*t)),240+p%4*200+m*S(a),d,d))d=i%m/9,p=i/m|0

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katkip

remix of d/16327 by u/joeytwiddle

function u(t) {

x.fillStyle=`#00ac`
for(i=1920;i--;)y=69*t,Z=690/y,X=(i-960)*Z,x.fillRect(i,y+t*t*8+30*S(S(X/389+Z*11)*C(X/389-Z*6-t)+C(X/69+Z*9))/Z,.2,6)

Dec 1 2020 10:01 AM UTC

}// 138/140

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ocean

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ciaccodavide

remix of d/20877 by u/pavel

function u(t) {

q=n=>t/n-(t/n+.5|0)
p=n=>60*n*Math.abs(q(n))
with(stats.dom.style)left=p(16)+'px',top=p(9)+'px',visibility=''
stats.setMode(q(9)<0^q(16)<0)

Dec 1 2020 8:09 AM UTC

}// 139/140

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DVD Stats

u/ciaccodavide

It doesn't change only when it hits the corner ;)
u/ciaccodavide

#DVD
u/Xen

clever lol
u/pavel

Very nice
u/ciaccodavide

#fps

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pavel

function u(t) {

with(x)for(beginPath(fill()),T=!T,fillStyle=T?'#fff2':R(),i=710;a=i--/113;arc(960,540,300+99*f(28),a,a))f=n=>T?n:n&&S(n|n*t)*S(a*n)/n+f(n-1)

Dec 1 2020 5:14 AM UTC

}// 140/140

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u/Xen

nice style!
u/Xen

nice style!
u/DataMeta

big fan of this one
u/danny@hille.dk

This is awesome!
u/Qwitter

fantastic!

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