Dweets awesomed by u/kaicarver

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: #ScaryMovies

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lionleaf

remix of d/662 by u/kaicarver

function u(t) {

if(t<2){c.width=1920;for(j=0;j<2;j++){for(i=0;i<6;i++){z=Math.round(Math.random());x.fillRect(700+j*300,280+i*100,200+100*((1-j)*z),50)}}}

Feb 19 2017 6:08 PM UTC

}// 138/140

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How about this one, kaicarver? It stops after two seconds, just refresh the page for a new one. You could do t%10<1 for a new one every 10 seconds as well. See #662 for a description of what this is.

u/kaicarver

Nice!
u/summivox

reminds me of Shenzhen.io...
u/Qwitter

The Dweet of Changes
u/Qwitter

not 2017 now, but 2021..... this place still stands, AWESOME

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kaicarver

remix of d/649 by u/kaicarver

function u(t) {

c.width=1920;for(j=0;j<2;j++){for(i=0;i<6;i++){z=Math.round(Math.random());x.fillRect(700+j*300,280+i*100,200+100*((1-j)*z),50)}}

Feb 19 2017 5:39 PM UTC

}// 129/140

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I Ching hexagram generator, right side up

u/kaicarver

scroll up or down to display a random hexagram, then look it up here http://wengu.tartarie.com/wg/wengu.php?l=Yij…
u/kaicarver

I'd like to make the blinking less frequent, but I can't figure out how, link randomness to a segment of t?...
u/joeytwiddle

Nice! This will break your program for 90% of every second: t%1>.1?Z:0

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gazbor

function u(t) {

for(i=3,n=t|0;n;i++){for(d=2;i%d&&d!=i;d++);d^i||n--}c.width=2e3;x.font="20em t";x.fillText(i-1,810,500)

Feb 19 2017 12:44 AM UTC

}// 104/140

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Prime numbers

u/iverjo

#prime

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kaicarver

function u(t) {

c.width=1920;for(j=0;j<2;j++){for(i=0;i<6;i++){z=Math.round(Math.random());x.fillRect(700+i*100,400+j*300,50,200+100*((1-j)*z))}}

Feb 18 2017 11:06 PM UTC

}// 129/140

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I Ching hexagram generator

u/kaicarver

scroll up or down to display a random hexagram, then look it up here http://wengu.tartarie.com/wg/wengu.php?l=Yij…

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xem

remix of d/645 by u/xem

function u(t) {

for(i=j=0;i<
118;j+={0:17,3:11,11:11,55:54,87:54,69:-68,101:-68}[i++]|1)x.fillStyle=R(i,i+99,i*3,1),x.fillRect(j%18*99,~~(j/18)*99,90,90)

Feb 17 2017 10:36 PM UTC

}// 137/140

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u/lionleaf

Awesome periodic table!
u/iverjo

wow, impressive!
u/xem

thanks! More info on http://codegolf.github.io/period1k/
u/KilledByAPixel

Nice! #periodic #periodictable

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pilow

function u(t) {

c.width=2e3;x.translate(800,500);for(i=0;i<20;++i){x.translate(180,0);x.rotate(t/4);x.fillStyle=R(i*12,255-i*12,150);x.fillRect(0,0,30,500)}

Feb 14 2017 12:46 PM UTC

}// 140/140

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u/lionleaf

Hypnotic

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iverjo

function u(t) {

for(i=0;i<2400;i++)x.beginPath(),x.arc(960+i*C(i/20),540+i*S(i/20)/3,29+i*i/2e4,0,7),x.fillStyle='#'+['000','A0E','FFF','9F0'][i%4],x.fill()

Jan 28 2017 10:00 PM UTC

}// 140/140

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Optical illusion: Go fullscreen and glance at the different parts of the image. As you move your eyes, it may seem like other parts of the image moves slightly.

Show more comments…
u/iverjo

This needs a large and bright display to work
u/donbright

lol i kept looking for 't' in your code, not there!
u/iverjo

Haha!
u/CliffJonesJr

I love these illusion dweets. Nice!
u/iverjo

Thanks :)
u/iverjo

#opticalillusion

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iverjo

function u(t) {

c.width=960;for(i=26;i--;)d=(i+3*t)%26,I=C(d*.7)>0?1:0,x.beginPath(),x.arc(480,270,I?(d*22):(600-d*22),0,6.4),x.lineWidth=12,x.stroke()

Jan 28 2017 9:13 PM UTC

}// 135/140

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Optical illusion: Go fullscreen and stare at the center for 15-30 seconds. Then look down at your keyboard. Notice anything unusual?

u/iverjo

129 characters: c.width=960;for(i=26;i--;)d=(i+3*t)%26,I=C(d*.7)>0?1:0,x.beginPath(),x.arc(480,270,I?d*22:600-d*22,0,7),x.lineWidth=12,x.stroke()
u/iverjo

#opticalillusion

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iverjo

function u(t) {

for(i=13;i--;)k=i!=12,x.beginPath(),x.arc(960+400*k*C(j=i*.523),540+400*S(j),9+50*k,0,7),x.fillStyle=R(a=255*k,a*(i==(t*9%12|0)),a),x.fill()

Jan 28 2017 6:59 PM UTC

}// 140/140

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Optical illusion: Look at the center dot for at least 5 seconds. What you should see is that the missing dot becomes light green. Keep staring at the same point for another 10-30 seconds, and you might notice that some pink dots will "disappear". This is due to cone fatigue in your eyes.

u/iverjo

Two characters can be shaved by replacing k=i!=12 with k=!!i
u/lionleaf

Haha, amazing!
u/iverjo

#opticalillusion

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New_Core

remix of d/630 by u/New_Core

function u(t) {

for(a=i=629;i--;)s=99/(b=-a+(i+t*60)%a),X=a*S(i*99)*s+1e3,Y=a*C(i)*s+500,i<628?b+=a:(X=Y=0,s=a),x.fillStyle=R(b,b,b),x.fillRect(X,Y,s*9,s*9)

Jan 20 2017 9:28 AM UTC

}// 140/140

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for a smoother start

u/donbright

bravo
u/iverjo

#stars #starfield

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