Top dweets by u/rodrigo.siqueira

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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rodrigo.siqueira

function u(t) {

!t&&(c.outerHTML=`<b contenteditable onInput=localStorage.T=this.innerHTML>${localStorage.T||"Text editor. Type here, content is saved."}`)

Jun 3 2020 4:26 PM UTC

}// 139/140

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Text editor with auto-save. Type and reload (or come back later). Your edits are stored in this Dweet.

u/rodrigo.siqueira

Shortcuts: control-b (bold), control-i (italic), control-u (underline). You can even paste html in this Dweet.
u/katkip

wow
u/rafroller

So cool ! Nice use of localStorage :)
u/sigveseb

Cool, didn't know that you could do bold, italics etc like that in contenteditable

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rodrigo.siqueira

remix of d/18962 by u/rodrigo.siqueira

function u(t) {

for(let i=2e3,f=(X,Y,n=9)=>Y?f(X*X-Y*Y,2*X*Y+1,n+.18):x.fillStyle=`hsl(${n*28},80%,${80*S(n)}%`;i--;x.fillRect(i,t*90,1,99))f(i/490-2,1-t/6)

May 27 2020 3:53 PM UTC

}// 140/140

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Fractal lightning #Julia #fractal for c = 0 + 0.18i

u/katkip

satisfying

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rodrigo.siqueira

remix of d/18828 by u/rodrigo.siqueira

function u(t) {

for(i=2e3,f=(X,Y,n=0)=>Y?f(X*X-Y*Y-.8,2*X*Y+.2,n+1):x.fillStyle=`hsl(${n*8},80%,${n+n*S(n)}%`;i--;x.fillRect(i,t*60,1,9))f(i/8e3-.2,.8-t/99)

May 17 2020 8:11 PM UTC

}// 140/140

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Colorful #Julia Zoom #fractal

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rodrigo.siqueira

remix of d/18445 by u/pavel

function u(t) {

for(X=f=c=>C(T(4*c/d)),Y=t/8-1.1,i=2e3;i--;x.fillRect(i,t*60,(1+f(X=i/480-2)*f(Y))/2,3))x.fillStyle=R(S(Y)*99,0,C(r=X*X+Y*Y)*99),d=r<0||S(r)

Apr 25 2020 6:31 PM UTC

}// 140/140

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Towards Infinity (Escher-like tilings) mirror #sphere #raytracing

u/KilledByAPixel

👍
u/joeytwiddle

#shiny

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rodrigo.siqueira

remix of d/18461 by u/rodrigo.siqueira

function u(t) {

for(X=f=c=>C(T(4*c/d)),Y=t/8-1,i=2e3;i--;x.fillRect(i,t*60,1+f(X=i/480-2)*f(Y)/d,3))x.fillStyle=R(K=C(r=X*X+Y*Y)*200,0,S(K)*80),d=r>1||C(r)

Apr 24 2020 12:57 AM UTC

}// 139/140

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Hello Dave (HAL 9000) #raytracing #glass #sphere

u/Xen

love it
u/13thptr

incredible

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rodrigo.siqueira

remix of d/18136 by u/rodrigo.siqueira

function u(t) {

for(c.width|=w=960,i=1e3;i--;x.lineTo(w+w*X/Z,w*Y/Z))
U=i*182+t,
V=C(i)*C(U/2+t),
X=3*C(U)+V*C(U),
Y=2*S(U)+V*S(U)-3,
Z=V-6.5
x.stroke()

Apr 5 2020 3:09 AM UTC

}// 136/140

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Variation of a #mobius strip

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rodrigo.siqueira

remix of d/17953 by u/tomxor

function u(t) {

c.width=-1;for(i=2e3;m=i&1,v=(K=t%2)<1?25:K%1*99**1.1,p=i%3*3,i--;)x.fillRect(150+p*S(P=i**.7)+v*C(V=i**.5+t),78+p*C(P)+v*S(V)*C(!p*i),1,1)

Mar 16 2020 11:30 AM UTC

}// 139/140

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Blowing The Enemy #coronavirus

Show more comments…
u/WorldMerge

This is really cool! Does setting the canvas width to -1 make it full-width?
u/rodrigo.siqueira

c.width=-1 is a trick I saw here (probably from u/pavel) that makes width=300 pixels. I used throw(c.width) to see "300". So it's a compact form to create a medium-low resolution image.
u/tomxor

300px is the default canvas width. What's particularly odd is that while setting negative numbers causes default value, everything else that ordinarily coerces to NaN will result in 0. e.g throw Number({}).toString() // NaN c.width={}; throw c.width.toString() // 0
u/tomxor

I guess in c++ land width has outofrange=300 and NaN=0
u/katkip

looks good
u/katkip

but dangerous

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rodrigo.siqueira

remix of d/17937 by u/tomxor

function u(t) {

c.style.filter=`blur(2vh)contrast(6e2%)`
for(c.width=128*5,i=6e3;i--;)x.fillStyle=R(50),x.fillRect(5*(i&127),i>>4,5,(i**3>>6)/(6+t/6e4)&9)

Mar 13 2020 2:17 PM UTC

}// 138/140

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#blood #cell #coronavirus attack

u/katkip

scary
u/tomxor

😱
u/aleamb

wow!!

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rodrigo.siqueira

remix of d/17386 by u/rodrigo.siqueira

function u(t) {

for(A=a=b=0,i=1e4*(t<8);i--;x.fillRect(a*1650-2130,b*1950+99,.3,1))r=0|2*Math.random(),a+=r/1.5-a/5+b*S(a*1.5)/1.5,b+=C(A*1.5)/3+.34-b/4,A=a

Feb 21 2020 12:46 AM UTC

}// 140/140

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Plants in my garden. #growth #plant #nature #tree #fractal

u/KilledByAPixel

🌱

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rodrigo.siqueira

remix of d/13119 by u/rodrigo.siqueira

function u(t) {

c.width+=X=Y=Z=d=.04
for(i=6e3;i--;)X+=-d*(Y+Z),
Y+=d*(X+.2*Y),
Z+=d*(.2+Z*(X-5)),
x.lineTo(980+80*(X*C(t)-Y*S(t)),800-Z*48+Y*19)
x.stroke()

Jan 12 2020 12:43 AM UTC

}// 140/140

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Turning Rössler Strange Attractor, a system of three non-linear ordinary differential equations with chaotic dynamics and fractal properties. Some people see this turning clockwise, some see counterclockwise due to the bistable optical illusion (search "Spinning Dancer" for explanation). #attractor #illusion

u/rodrigo.siqueira

The rotation effect trick X*C(t)-Y*S(t) was "borrowed" by Frank Force KilledByAPixel's #Lorenz Attractor: from https://www.dwitter.net/d/14752

dwitter.net | rodrigo.siqueira (17962)