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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Agnes

remix of d/8945 by u/firegodjr

function u(t) {

F=n=>{return C(n)*C(n)+S(n)*S(n)<1}
x.drawImage(c,0,l=10)
for(j=214;j--;)x.fillStyle=F(j^t*60)?"#0f0":"#000",x.fillRect(j*l,0,l,l)

Jul 28 2018 8:15 PM UTC

}// 130/140

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Visualising numbers for which sin(x)*sin(x) + cos(x)*cos(x) < 1.

u/donbright

wait wait wait wait wait.... sin^2 + cos^2 = 1. im so confused. is this about the imprecision of floating point arithmetic?
u/donbright

this is absolutely fascinating... set it ==1 or >1 gives different patterns.
u/donbright

also fun... return S(n)/C(n)==T(n)

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katkip

function u(t) {

x.font='0.8in O'
x.fillText(u,124,555)

Aug 1 2018 1:58 PM UTC

}// 38/140

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Self-creating formula like Tupper's self-referential formula.

u/Xen

smallest i can get is 33bytes... x.font=".9in'",x.fillText(u,9,99)

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katkip

function u(t) {

n=frame
q=n%2?200:500
d=n%2?2*t:2*t/.987654321
X=960+q*C(d),Y=540+q*S(d)
n%3?x.moveTo(X,Y):x.lineTo(X,Y)
x.stroke()
x.fillRect(X,Y,5,5)

Jul 30 2018 10:39 PM UTC

}// 135/140

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Pineapple

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katkip

function u(t) {

x.font='5cm A';x.fillText("Page freeze in 10s",250,650)
if(t>10)loop();

Aug 1 2018 9:18 AM UTC

}// 71/140

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BE CAREFUL! SCROLL DOWN FAST IF YOU DON'T WANT THE PAGE TO FREEZE!

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katkip

remix of d/9009 by u/katkip

function u(t) {

c.width=800;a=200;b=6/a;for(i=0;i++<=a;){k=(i*t)%a*b;x.moveTo(2*a+a*C(i*b),a-a*C(i*b));x.lineTo(2*a+a*S(k),a+a*S(k));}x.stroke();FPS+=t/8

Aug 1 2018 8:53 AM UTC

}// 137/140

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Slowing down.

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katkip

function u(t) {

eval(src);

Aug 1 2018 8:37 AM UTC

}// 10/140

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wbbradley

remix of d/9019 by u/wbbradley

function u(t) {

c.width=1920
for(i=0;i<15;i++){
j=i/19.
x.font=178+i*39+'px s'
r=150
x.fillText('🌀',780+r*C(t)*j-i*20,590+r*S(t)*j+i*20)}

Aug 1 2018 2:28 AM UTC

}// 121/140

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wbbradley

remix of d/9019 by u/wbbradley

function u(t) {

x.fillRect(0,0,1920,1200)
for(i=0;i<20;i++){
j=i/19.
x.font=178+i*80+'px s'
r=150
o=40*i
x.fillText('💮',800+r*C(t)*j-o,600+r*S(-t)*j+o)}

Aug 1 2018 2:25 AM UTC

}// 136/140

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wbbradley

remix of d/9018 by u/wbbradley

function u(t) {

c.width=1920
for(i=15;i>=0;i--){
j=i/19.
x.font=178+i*39+'px s'
r=150
x.fillText('🦄',780+r*C(t)*j-i*20,590+r*S(-t)*j+i*20)}

Aug 1 2018 2:19 AM UTC

}// 123/140

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wbbradley

function u(t) {

c.width=240 // clear the canvas
for(i=0;i<15;i++){
j=i/19.0
x.font=78+i*1.5+'px serif'
x.fillText('🧘‍♂️', 80+30*C(t)*j-i, 90+10*S(t)*j+i)}

Aug 1 2018 2:05 AM UTC

}// 138/140

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