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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New_Core

function u(t) {

for(c.width|=i=58;i--;x.lineTo(-300+a*S(b-1)+q%2600,1400+a*C(b-1)-q/2%1700))q=S(t)*99+t*99,a=99*S(-t+C(b=i/9)+20**C(b))+200
x.fill()

Jul 21 2019 7:56 PM UTC

}// 132/140

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wait for something to swim by..

u/DataMeta

#organic
u/KilledByAPixel

🐙
u/13thptr

#jellyfish ?
u/katkip

#cute
u/joeytwiddle

Very good #fish Interesting head -> leg trick

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joeytwiddle

function u(t) {

c.width|=0;for(i=2;i--;)s=i?99+80*S(t*3):9,x.font=P=s+"px sans",
T=i?P:'X'.repeat(400),
x.fillText(T,960-x.measureText(T).width/2,540+s/3)

Jul 24 2019 8:53 AM UTC

}// 138/140

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To centralise #text vertically, add ~fontSize/3

u/joeytwiddle

To centralise horizontally, subtract x.measureText(T).width/2
u/joeytwiddle

(I think u/f8f82804 showed me that trick)

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jaburns

function u(t) {

c.width|=0
for(o=i=0;i<2;)w=400*C(t%(P=1.57)-i*P),m=i?T=m+w:w,x.fillStyle=`#0${5+(0|t/P+i)%4}7`,x.fillRect(960+o-T/2-5*i++,0,o=w,1e4)

Jul 25 2019 4:15 AM UTC

}// 133/140

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u/KilledByAPixel

👍

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KilledByAPixel

function u(t) {

for(i=1024;i--;)"؀0Ā@Ā@鲀섀AրÐﲀꢀçཀŸ樂ᵏ詣挨琙䰗鴇灜ᄌᡄヰކᄀDGg＀ﾀÿ羀ÿ㼀~⇀ǂ぀Ćྀø".charCodeAt(i/16)&1<<i%16&&x.fillRect(i%C*C,(i>>5)*C,C=32,C)

Jul 24 2019 7:00 PM UTC

}// 138/140

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Undertale ~ Sans

u/magna

Shave 3 chars: (i>>5)*C -> i&-31
u/KilledByAPixel

you can also do i>>5*C, but both ways distort the image
u/aleamb

#pixelart
u/Jasper

I don't rightly know why, but i&-32 seems to work without distortion as far as I can tell
u/KilledByAPixel

Oh wow, nice!

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rep_movsd

function u(t) {

for(c.width=w=1080,j=i=1,q=65537,p=k=255;i++<w;j=j*75%q,k=k*75%q,x.fillStyle=R(0,0,0,e=C(t+i)),x.fillRect(e*75+w*j/q,(t*k/p+w*k/q)%w,4,4));

Jul 23 2019 12:20 PM UTC

}// 139/140

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Snowfall

u/KilledByAPixel

#snow
u/katkip

black snow is beautiful. yellow snow is not
u/rep_movsd

I started out trying to make a meteor shower :p

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f8f82804

remix of d/15120 by u/f8f82804

function u(t) {

for(a=b=j=0,h=c.height^=0,i=4*h;i--;j+=2*Math.random()-t)x.fillRect(420+h*(a=a/2+((j&2?j:~j)&1)/2),h*(b=b/2+(j&2)/4),4,4)

Jul 23 2019 10:08 PM UTC

}// 121/140

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#animated #chaos #fractal

u/f8f82804

#chaosgame

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robbyg

function u(t) {

c.width|=0
for(i=9;i--;)for(p=100;p--;)x.fillRect(560+i*100+p%5*10+S(t)*300,440+~~(p/5)*10+T(t/2-(i/4-p/800))*50,10,10)

Jul 23 2019 1:36 PM UTC

}// 119/140

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Can't seem to hold it together.

u/robbyg

#default

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katkip

function u(t) {

z=c.style.background=R(130,190,198);for(i=99;i--;)x.fillStyle=R(-z,128-z/2,0),x.fillRect(i*20,300+t*t*9+(z=S(t-i/9*S(t-i/99))*99),20,99)

Jul 22 2019 1:09 PM UTC

}// 136/140

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Simple landscape terrain. #landscape #d3 #perspective #realistic #generator #waitforit

u/13thptr

nice
u/Xen

very smooth
u/katkip

thx

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zibx

function u(t) {

w=1920/3;
h=1080/4;
i=w;j=h;
for(k=10;k--;){
 for(p=20;p<50;p++){
  i+=S(t/p)*w/30;
  j+=C(t/p)*h/30;
 }
 x.fillRect(i, j, 10,10)
 t*=t
}

Jul 25 2019 8:18 PM UTC

}// 137/140

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Something

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robbyg

function u(t) {

s="3E71EAA0325D3E7C"
s.match(/.{2}/g).map((h,v)=>{z=parseInt(h,16);for(i=128,h=0;i>=1;i/=2,h++)z&i&&x.fillRect(h*99,v*99,99,99)})

Jul 23 2019 7:18 PM UTC

}// 129/140

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Converting a hexadecimal string into a sprite. Change the value of s to play!

u/robbyg

121: "3E71EAA0325D3E7C".match(/.{2}/g).map((s,v)=>{for(i=128,h=0;i>=1;i/=2,h++)parseInt(s,16)&i&&x.fillRect(h*99,v*99,99,99)})
u/robbyg

119 (okay I should do something else now): "3E71EAA0325D3E7C".match(/../g).map((s,v)=>{for(i=128,h=0;i>=1;i/=2,h++)parseInt(s,16)&i&&x.fillRect(h*99,v*99,99,99)})
u/robbyg

#pixelart