Dweets awesomed by u/skeletonNatte

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: #Food

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New_Core

function u(t) {

b=a=c.width=500;for(i=a*5;i--;)g=i%(h=b+9*S(t))>h/2?0:b,x.fillRect(g+i%13*b*2-1*i*.6+(b*8*S(t*.5))%b*2,150+i*.05,b=20+i*.05,1)

Dec 31 2016 12:13 PM UTC

}// 126/140

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u/iverjo

Awesome :D
u/iverjo

This dweet reminds me of the Windows 3.1 chess background image: http://i.imgur.com/Zv5eBRk.png
u/New_Core

#checkerboard

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BriSeven

function u(t) {

if(!t)X=[];r=Math.random;s=2e3;i=s;while(i)o=X[i],c=i%2*s,X[i]=o<0||o>s||!o?500:o+r()*16-8,x.fillStyle=R(c,c,c,.05),x.fillRect(o,X[--i],8,8)

Dec 19 2016 10:28 AM UTC

}// 140/140

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u/joeytwiddle

Yikes. That looks contagious!

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lionleaf

remix of d/421 by u/lionleaf

function u(t) {

c.width=2e3;x.font='99px Arial';v='Write long then shorten!';for(i=v.length;i--;)x.fillText(v[i],i*79+S(t+i)*10,540+S(t*9+i)*20)

Aug 17 2016 5:49 PM UTC

}// 128/140

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You can now enter more than 140 characters while writing a dweet! (But you can't post anything longer than 140 characters)

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u/iverjo

Sweet :) I remember removing maxlength=140 in my dev console when creating dweets at arkt.is/t/ ^^
u/PhiLho

Yes, that's what I did here as well... :-D Ah, except I get an alert dialog on each character beyond 140! Not very practical to type. The red counter should be enough...
u/PhiLho

And apparently we can now safely replace semi-colon with newline, even on Windows! (they counted as two chars, previously...)
u/iverjo

Yes, that alert should be removed. Luckily, one can suppress it in FireFox by checking the checkbox inside the alert
u/lionleaf

Ooops, I never got the alert for some reason. And I didn't see this before now. Should be fixed now.
u/lionleaf

#feature

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sigveseb

function u(t) {

s=S(t);r=a=>Math.random()*3|0;for(n=c.width=i=2e3;i--;x.lineTo(n*X/Z,n*U/Z))F=r(),U=1+r(),V=r(),Z=V*C(t)-F*s+9,X=4+s+V*s+F*C(t);x.stroke()

Aug 6 2016 10:31 PM UTC

}// 138/140

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u/iverjo

I admire your mad skills

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chet

remix of d/369 by u/chet

function u(t) {

c.width=i=255;a=(z,Y)=>{for(X=25;X--;){x.fillStyle=R(i-7*X,z*2,-z*2);x.fillRect(X+z+i/2,Y,1,i)}};for(Y=i;Y>179;Y--)a(C(-8*t+Y*.1)*Y*.4,i-Y)

Jul 25 2016 2:36 PM UTC

}// 139/140

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iverjo

function u(t) {

for(i=8e3;i--;)s=149/(i+99),c=S(8e4*s),x.fillStyle=R(9,99+49*c,29),x.fillRect(2e3*(T(i/9)+s*t)%2e3,2e3*s,99*s,99*s)

Jul 22 2016 11:39 PM UTC

}// 115/140

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#grass

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iverjo

function u(t) {

i=W=c.width=960;X=250*t%W;G=(1-S(X/29))*.3;x.lineWidth=80;x.arc(X,200,40,G,6.29-G);x.stroke();while(i>X)x.fillRect(i,190,20,20),i-=190

Jul 22 2016 12:34 AM UTC

}// 134/140

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Pacman, inspired by tamberlo

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u/tamberlo

thank you for cleaning up my idea ;) your solution is very neat
u/iverjo

Thanks :) It lacks the yellow color, though. I'm not sure I could hack that in without removing the rectangles
u/iverjo

Golfed a bit (128 characters): i=W=c.width=960;x.lineWidth=80;x.arc(X=250*t%W,200,40,G=.3-.3*S(X/29),6.29-G);x.stroke();for(;i>X;i-=190)x.fillRect(i,190,20,20)
u/donbright

lol
u/iverjo

#pacman
u/rodrigo.siqueira

#atari

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sigveseb

remix of d/297 by u/sigveseb

function u(t) {

L=c.width=255;for(i=9<<12;a=i&L,b=i>>8,n=b-45,m=a-99,i--;x.fillRect(a,b,A=1/(((t+a/n)%2)^b/n),A))n*=(B=(L*S(t*29+n/5)+m*m+n*n)/5e3)<1?C(B):1

Jul 21 2016 5:43 PM UTC

}// 140/140

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with wobbles!

u/iverjo

Insane!
u/joeytwiddle

amazing :)

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3bl3gamer

remix of d/271 by u/3bl3gamer

function u(t) {

c.width=512;for(i=9<<14;a=i&511,b=i>>9,m=a-256,n=b-99,i--;)l=m*m+n*n,l<3e4&&(n*=C(l/5e3-6)),(((m/n+128+t*8)%2)^(b/n%2))&&x.fillRect(a,b,1,1)

Jul 21 2016 9:11 AM UTC

}// 140/140

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The Warp

u/iverjo

Trippy :D

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greentec

function u(t) {

a=255;for(i=0;i<1920;i+=5)for(j=0;j<1080;j+=5)r=(a*C(.0174*i))%255,g=(a*S(.0174*j))%255,b=(r*g)%255,x.fillStyle=R(r,g,b),x.fillRect(i,j,5,5)

Jul 20 2016 11:49 AM UTC

}// 140/140

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u/iverjo

Here's a version that draws only once: if(!t){a=255;for(i=0;i<1920;i+=5)for(j=0;j<1080;j+=5)x.fillStyle=R(r=(a*C(.0174*i))%a,g=(a*S(.0174*j))%a,r*g%a),x.fillRect(i,j,5,5)}
u/greentec

Oh, Thanks! It was very helpful.

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