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.

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eruonna

function u(t) {

a=[0,9,0,-9,0]
if(t){if(i>=0){d=(p[i--]+1)%4;p.push(d);j++;b+=a[d];c-=a[d+1];x.lineTo(b,c);x.stroke()}else i=j}else{p=[0];i=j=0;b=960;c=540}

Apr 17 2017 8:56 PM UTC

}// 140/140

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Works best in full screen, otherwise line is too thin

u/donbright

how does it work ?
u/eruonna

One way to draw the next iteration of the dragon curve is to take the previous iteration and then add it to itself backwards and rotated 90 degrees. Here p is the array of previous steps, j the index of the current step, and i walks backward through p. When i gets to the beginning, we set it equal to j and start over.
u/donbright

thanks, that is fascinating

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magna

function u(t) {

c.width|=0
x.font=f='60px monospace'
for(Y=18;Y--;)for(X=32;X--;)x.fillText(X<8?(t+Y<<3>>28-X*4&15).toString(16):-~X%3?0:'',X*40,-~Y*60)

Apr 19 2017 6:47 AM UTC

}// 136/140

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Hexdump of the void

u/magna

This portion can be used in an operator precedence quiz: t+Y<<3>>28-X*4&15

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hscells

function u(t) {

c.width=1920
x.lineWidth=s=99
for(i=0;i<5;i++)x.beginPath(),x.arc(960,540,i*s,i,i-(S(t)+1)*Math.PI),x.stroke()

Apr 17 2017 10:51 AM UTC

}// 110/140

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hscells

function u(t) {

w=c.width=1920;s=32;for(i=0;i<w;i+=s){for(y=0;y<c.height;y+=s){x.fillStyle=`hsl(${i+y*t},99%,70%)`;x.fillRect(i,y,s,s)}}

Apr 17 2017 5:19 AM UTC

}// 120/140

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u/sigveseb

Pretty colors!

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prawnwarp

remix of d/2529 by u/prawnwarp

function u(t) {

c.width|=0;x.lineWidth=2;r=500;a=960;b=540;x.moveTo(a,b);for(i=1;i<127;i+=2){a+=C(t*i)*r/i;b+=S(t*i)*r/i;x.lineTo(a,b);}x.stroke();

Apr 19 2017 12:14 PM UTC

}// 131/140

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eruonna

remix of d/2509 by u/eruonna

function u(t) {

a=[0,-9,0,9,0]
if(t){if(i>=0){d=(p[i--]+1)%4;p.push(d);j++;b+=a[d];c-=a[d+1];x.lineTo(b,c);x.stroke()}else i=j}else{p=[0];i=j=0;b=380;c=830}

Apr 17 2017 9:29 PM UTC

}// 140/140

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adjusted position to get more on the screen

u/donbright

:)

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eruonna

function u(t) {

c.width|=0
t?o.push({x:960,y:540,X:C(t*9),Y:S(t*9)}):o=[]
o.map(p=>{x.fillRect(p.x,p.y,9,9),p.x+=p.X,p.y+=p.Y})
o=o.length<999?o:[]

Apr 17 2017 8:33 PM UTC

}// 131/140

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u/donbright

great minds think alike https://www.dwitter.net/d/2159

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sfz

remix of d/2515 by u/sfz

function u(t) {

c.width|=w=213
h=120
d=t?~~(t*60)%9?d:new Date%4:0
x.x=x.x||w
x.y=x.y||h
x.x+=d<2?2*d-1:0
x.y+=d>1?2*d-5:0
x.fillRect(x.x%w*9,x.y%h*9,99,99)

Apr 18 2017 7:43 AM UTC

}// 140/140

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Bit shoddy roomba

u/sfz

Or a cat toy!
u/Polyducks

It's alive!

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sfz

function u(t) {

w=213
h=120
d=t?~~(t*60)%9?d:new Date%4:0
x.x=x.x||w
x.y=x.y||h
x.x+=d<2?d<1?1:-1:0
x.y+=d>1?d>2?1:-1:0
x.fillRect(x.x%w*9,x.y%h*9,9,9)

Apr 18 2017 1:27 AM UTC

}// 135/140

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eruonna

function u(t) {

a=[0,-9,0,9,0]
if(!t){n=0;d=0;b=380;c=830;x.moveTo(a,b)}
d+=((n&-n)<<1)&n++?1:3;d%=4
b+=a[d];c-=a[d+1]
x.lineTo(b,c);x.stroke()

Apr 17 2017 10:36 PM UTC

}// 127/140

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Totally different dragon curve implementation with 13 fewer bytes and it correctly draws the first segment

u/eruonna

okay, not sure if it is worth kicking out yet another version to get the positioning right
u/eruonna

okay, not sure if it is worth kicking out yet another version to get the positioning right
u/donbright

color - - a=[0,-9,0,9,0] if(!t){n=0;d=0;b=380;c=830} d+=((n&-n)<<1)&n++?1:3;d%=4 b+=a[d];c-=a[d+1] x.fillStyle=R(128+n%256,64+n%128) x.fillRect(b,c,9,9)