Dwitter - javascript demos in 140 characters

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.

Try the new frontend: beta.dwitter.net
Current theme challenge: #Food

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daddydomar

function u(t) {

x.fillStyle=R(C(t*2)*256,S(t*2)*256,256-S(t*2)*256,0.5)
x.fillRect(960+S(t-0.1*t)*256,540+S(t+0.1*t)*256,2+15*S(t),2+30*S(t))

Jan 2 2020 10:22 AM UTC

}// 125/140

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*almost* harmonic

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danschormans

function u(t) {

A=Math.abs
x.fillStyle=R(A(S(t+1)*255),A(S(t+2)*255),A(S(t)*255))
x.fillRect(960,540,44,44)
x.translate(C(t)*t/9,S(t)*t/9)

Dec 31 2019 2:09 PM UTC

}// 122/140

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First dweet: colour spiral

u/Xen

nice!

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mildlybean

function u(t) {

onkeydown=e=>X=Y=V=C=0;Y==990&&X>C-9&&C+83>X?V=-44:X%=c.width|=onmousemove=e=>C=e.x*3.3;x.fillRect(X+=8,Y+=V++,16,16);x.fillRect(C,999,99,9)

Jan 1 2020 3:46 AM UTC

}// 140/140

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I made it better

u/mildlybean

Click the canvas, then tap any key to start. Move your mouse to keep the ball in the air.
u/tylertoomey

This is great

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B_H

function u(t) {

c.width=1920;for(i=0;i<33;i++)for(j=0;j<9;j++)for(k=0;k<9;k++)x.fillRect(560+99*j+66*S(i+j)*S(2*t+k+i),199+99*k+66*S(i)*C(i+k),9-4*C(t+j),9)

Dec 31 2019 6:27 PM UTC

}// 140/140

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Xen

remix of d/17044 by u/katkip

function u(t) {

x.fillStyle=`hsl(${t*=9} 99%50%`
x.fillRect(960+S(t)*t,540+C(t)*t,9,9)

Jan 2 2020 1:56 AM UTC

}// 70/140

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70byte demake

u/pavel

Both this one and the parent are broken in safari, you can't omit the space between saturation and lightness
u/katkip

yep...

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mildlybean

function u(t) {

with(x)for(c.width|=i=960,translate(i,540),M=m=>fillRect(0,0,1,m?80:200,fillStyle=m?R():'#00f');--i;rotate(1))M(0),M(1),fillRect(400,0,9,9 )

Dec 30 2019 10:41 PM UTC

}// 140/140

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u/tomxor

Aye aye
u/Xen

eyup

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jsizzle

function u(t) {

j=t/15;y=540;c.width=1920;for(i=t+(S(j)+1)*2;i>t-(S(j/3)+1)*2;i-=0.02)x.fillRect(S(i+C(i/5))*(S(j)*800)+y*2,C(i+S(i/9))*(C(j/3)*500)+y,t,2);

Jan 2 2020 9:40 PM UTC

}// 140/140

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rodrigo.siqueira

remix of d/16995 by u/pavel

function u(t) {

for(let i=5e3,j,s;j=--i>>4;x.fillRect(960+(j%8*2+i%2-7.5)*s,C(2/t)*570+(i%16-8.5+9)*s,s,s))x.fillStyle=R(s=600/((j>>3)+1-t*30/11%1),s/2,s/4)

Dec 30 2019 12:05 AM UTC

}// 140/140

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#perspective #squares

u/rep_movsd

#underrated
u/deobfuscate

Yes, please destroy my mind.

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KilledByAPixel

function u(t) {

with(x)for(c.width|=i=28,scale(i,i);i;stroke())lineTo(((i-->>1)+t%2)*9-18,9*(i%4<2)+9),fillText('M A G F E S T',2+C(i)/2,28+S(i)/2)

Jan 1 2020 5:51 PM UTC

}// 131/140

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Super MAGFest 2020 starts tomorrow!

u/KilledByAPixel

#logo

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Uam

function u(t) {

c.width=1920
for(i=1000;i--;){x.fillStyle=R((i*t*t)%256,(i^3*t)%256,(20*i)%256);x.fillRect(i,500+(1000*i-i*i)/625*S(t*.00628*i),10,10)}

Dec 31 2019 5:32 PM UTC

}// 135/140

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I tried to remix some pico-8 tweet I saw yesterday. I’ll try to make it better tomorrow