Dweets awesomed by u/FireFly

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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FireFly

function u(t) {

t||x.translate(X=960,540,c.onmousemove=e=>X=e.offsetX);for(i=80;i--;x.rotate(8))x.fillStyle=`hsl(${X},80%,${i}%)`,x.fillRect(i,S(t)*960,i,i)

Feb 28 2017 9:39 PM UTC

}// 140/140

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Interactive demo! Move your mouse to change colour!

Show more comments…
u/FireFly

Thanks to veubeke and p01 for golfing tips :)
u/lionleaf

Oh wow! That's amazing
u/sigveseb

really nice!
u/iverjo

Sick!
u/profit

really cool!
u/lionleaf

On mobile you can tap at different locations for different colors
u/sfacci

ridiculously awesome
u/SpecialAgent

Excellent! And packed full of useful technical tricks, double whammy!
u/Xen

Done Re-mi(X)en
u/jaemiejaemie

borrowed the code used for capturing the mouse x on #4296, thank you
u/iverjo

#interactive
u/lionleaf

#spiral

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New_Core

function u(t) {

w=c.width=128;for(i=w*w;i--;)x.fillStyle=R(0,0,0,Math.random()),x.fillRect(i%w,i%(w-1),1,1);x.font='5em A';x.fillText("☠",25,65);

Feb 28 2017 8:16 PM UTC

}// 129/140

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I did one with ImageData but the skull didnt fit in. (it was faster but not fast enough to size it up).

u/sfz

swank!
u/New_Core

#noise

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FireFly

function u(t) {

if (!t) x.translate(X=960, 540)
x.fillStyle = 'hsl('+t*20+',90%,50%)'
x.fillRect(0, 0, X/t, X/t)
x.strokeRect(0, 0, X/t, X/t)
x.rotate(16/t)

Feb 28 2017 5:40 PM UTC

}// 140/140

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Rainbow flower

u/SpecialAgent

so pretty. good use of translation.

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FireFly

function u(t) {

x.strokeStyle='hsl('+t*8+',90%,50%)'
x.beginPath()
for(i=24;i;x[i-24?'lineTo':'moveTo'](960+--i*20*C(U=i/4+t/4),540+i*20*S(U)));
x.stroke()

Feb 28 2017 4:37 PM UTC

}// 139/140

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u/donbright

cool hsl

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FireFly

function u(t) {

X=0;X||(c.onmousemove=(e)=>(x.lineTo(X=e.offsetX/c.offsetWidth*1920,Y=e.offsetY/c.offsetHeight*1080),x.beginPath(x.stroke()),x.moveTo(X,Y)))

Feb 28 2017 3:28 PM UTC

}// 140/140

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Paint! Works best in fullscreen, unfortunately I can't fit detection of mouse button to toggle painting (also not sure how, without two more event handlers…)

u/Kalanchoe

Nice! moveTo is unnecessary if you already have beginPath and lineTo; c.offsetWidth/1920 and c.offsetHeight/1080 are both equal to about .2958 (at least on the desktop): https://www.dwitter.net/d/809
u/FireFly

Won't c.offsetWidth and c.offsetHeight change when the user goes fullscreen? I wanted to support both not-fullscreen and fullscreen equally well. Good point about moveTo!

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MiseryMyra

function u(t) {

c.width=1920
for(i=1;i<7;i++){x.fillStyle=R(i*S(t)*S(t)*255,0,C(t)*C(t)*99,1)
x.fillRect(800*S(i*t)+960,300*C(i*t)+99*C(3*i*t)+540,99,999)}

Feb 28 2017 1:59 PM UTC

}// 139/140

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FireFly

function u(t) {

x.strokeStyle = 'hsl('+t*8+',90%,50%)'
x.beginPath()
r = 80 + 10*T(t*16)
x.moveTo(X=960, Y=540)
x.lineTo(X + r*C(t), Y + r*S(t))
x.stroke()

Feb 28 2017 1:12 PM UTC

}// 139/140

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Colour splat

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FireFly

function u(t) {

if(t%12<.01)c.width|=0;x.beginPath();for(i=12;i;x.moveTo(960+40*i*C(T),540+40*(i-1)*S(T)),x.arc(940,540,40*i,T,T=t/8%1*--i*6.28));x.stroke()

Feb 28 2017 12:21 PM UTC

}// 140/140

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u/SpecialAgent

Impressive! Reminds me of a clockwork orange.

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guga2112

function u(t) {

m=255;t=t*10;r=t%m;g=(t+100)%m;b=(t*t)%m;x.fillStyle=R(r,g,b)
x.fillRect(960+C(t)*t,540+S(t)*t,10,10)

Feb 28 2017 9:50 AM UTC

}// 101/140

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u/donbright

really like this one

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Jenky

function u(t) {

c.width=320;d=new Date/1e3;r=9
a=v=>{x.beginPath();x.lineWidth++;x.arc(160,90,9*r--,0,v*.1047);x.stroke()}
a(d%60);a(d/60%60);a(d/3600%12*5)

Feb 28 2017 7:10 AM UTC

}// 140/140

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OS-time Arc Clock

u/donbright

love it!

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