Hot dweets by u/eruonna

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: #Opposites

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eruonna

function u(t) {

if(t%1<.01){c.width|=0;x.font="48px monospace"
for(i=127;--i;)for(j=33;--j;)x.fillText(Math.random()>.5?"\\":"/",i*15,j*35)}

Apr 26 2017 8:48 PM UTC

}// 124/140

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u/donbright

ingenious
u/sigveseb

classic old-school effect :)
u/rep_movsd

#10print
u/rep_movsd

#tenprint

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eruonna

function u(t) {

if(!t)a=578,b=500
d=[262,578,0,0,500,500,"red","#0f0","blue"]
i=~~(Math.random()*3)
a=.5*a+d[i];b=.5*b+d[i+3]
x.fillRect(a,b,1,1)

Apr 27 2017 8:05 PM UTC

}// 129/140

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eruonna

remix of d/2522 by u/magna

function u(t) {

c.width|=0
t?0:n=0
onkeyup=e=>n++
x.font='50px monospace';
((u+'').slice(0,n%154)+' |'[t&1]).split('\n').map((r,i)=>x.fillText(r,0,++i*50))

Apr 18 2017 6:27 PM UTC

}// 139/140

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Hacker typer

u/sigveseb

nice
u/magna

Can be used when your boss catches you looking at dwitter.net at work.

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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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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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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)

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eruonna

remix of d/2511 by u/eruonna

function u(t) {

a=[0,-1,0,1,0]
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 9:30 PM UTC

}// 140/140

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denser version

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eruonna

function u(t) {

for(c.width&=i=-9;i<9;i++,x.fillStyle=`hsl(${9*i},99%,50%`,x.beginPath(),r=i*40,x.arc(960+r*S(t/Math.abs(i)),540+r*C(t/i),20,0,6),x.fill());

Apr 14 2017 8:43 PM UTC

}// 140/140

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u/donbright

fascinating that they dont seem to overlap (ever?)

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eruonna

function u(t) {

c.width|=0;
x.lineWidth=3;
for(i=0;i<1.57;i+=.01){
  x[i?'lineTo':'moveTo'](960+540*C(17*(t+i)),540+540*S(19*(t+i)))
}
x.stroke()

Apr 14 2017 9:00 PM UTC

}// 129/140

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u/donbright

this boggles my mind

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