Dweets by u/mxfh

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: #ScaryMovies

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mxfh

remix of d/22439 by u/mxfh

function u(t) {

for(d=x.getImageData(I=0,0,i=w=c.width=256,w);i--;)for(j=w;j--;I+=4)d.data.set([(f=i^j)%w*T(f+t*30),f%9*w,j,w],I)
x.putImageData(d,0,0)

Apr 12 2021 5:35 PM UTC

}// 135/140

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mxfh

remix of d/22438 by u/mxfh

function u(t) {

d=x.getImageData(b=0,0,w=c.width=256,w)
for(i=w;i;i--)for(j=w;j;j--,b+=4)d.data.set([f=(i^j)%9*3,w+S(t*9+f)*w,i,w],b)
x.putImageData(d,0,0)

Apr 11 2021 3:10 AM UTC

}// 139/140

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some colors for https://www.dwitter.net/d/22390

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mxfh

remix of d/22437 by u/mxfh

function u(t) {

d=x.getImageData(o=-1,0,w=c.width=256,h=128)
for(i=b=64;i>-b;i--)for(j=h;j>-h;j--)d.data[o+=4]=((i*j)%~(T(t)*h))**8
x.putImageData(d,0,0)

Apr 11 2021 1:33 AM UTC

}// 137/140

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u/EliteDaMyth

for(d=x.getImageData(o=-1,0,w=c.width=256,h=128),i=b=64;i-->-b;)for(j=h;j>-h;j--)d.data[o+=4]=(i*j%~(T(t)*h))**8 x.putImageData(d,0,0) 134
u/EliteDaMyth

in the above comment the space after **8 is a newline

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mxfh

remix of d/22389 by u/mxfh

function u(t) {

d=x.getImageData(o=-1,0,w=c.width=256,h=128)
for(i=b=64;i>-b;i--)for(j=h;j>-h;j--)d.data[o+=4]=((i*j)%~(T(t)*b-i))**8
x.putImageData(d,0,0)

Apr 11 2021 1:31 AM UTC

}// 139/140

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u/EliteDaMyth

for(d=x.getImageData(o=-1,0,w=c.width=256,h=128),i=b=64;i>-b;i--)for(j=h;j>-h;j--)d.data[o+=4]=(i*j%~(T(t)*b-i))**8 x.putImageData(d,0,0) 137
u/EliteDaMyth

for(d=x.getImageData(o=-1,0,w=c.width=256,h=128),i=b=64;i-->-b;)for(j=h;j>-h;j--)d.data[o+=4]=(i*j%~(T(t)*b-i))**8 x.putImageData(d,0,0) 136
u/mxfh

for(d=x.getImageData(o=3,b=i=64,w=c.width=256,h=128);i-->-b;)for(j=h;j-->-h;)d.data[o+=4]=(i*j%~(T(t)*b-i))**8 x.putImageData(d,0,0) 132

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mxfh

remix of d/22388 by u/mxfh

function u(t) {

d=x.getImageData(f=S(t),o=3,w=c.width=512,h=256);for(i=b=128;i>-b;i--)for(j=-h;j<h;j++)d.data[o+=4]=((i*j)**4+f*b)%3*h;x.putImageData(d,0,0)

Apr 7 2021 2:39 PM UTC

}// 140/140

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u/magna

u/mxfh nice to see you back!

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mxfh

remix of d/676 by u/mxfh

function u(t) {

d=x.getImageData(0,o=3,w=c.width=512,h=256);for(i=b=128;i>-b;i--)for(j=-h;j<h;j++,o+=4)d.data[o]=(i*j+~(t*b))**4%7*h;x.putImageData(d,0,0)

Apr 7 2021 1:45 PM UTC

}// 138/140

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golfed and centered x/y loops inspired by https://twitter.com/aemkei/status/1379190275…

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mxfh

function u(t) {

for(i=h=700;i-->-h;x.fillStyle=R(u=i>0?(h+i*t)%i*5:h))x.fillRect(u?960-i:0,i+h,u?i*2:2e3,1)

Jan 30 2019 5:15 AM UTC

}// 91/140

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mxfh

remix of d/2442 by u/mxfh

function u(t) {

c.width|=b=50
h=S(t)
for(e=6.283;e>0;x.lineTo(d*C(e-=.01)+h*(C(e)+T(e/3+t/T(e)))+960,d*S(e+S(t)/9)-h+540))d=420
x.fill("evenodd")

Jan 22 2019 11:44 PM UTC

}// 129/140

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u/Xen

NICE! :-)
u/katkip

Haha
u/magna

#glitch
u/mxfh

this one doesn’t even need the fillrule. Was just looking into other cycloids and Lissajous figures, only to end up with a circle.

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mxfh

remix of d/2759 by u/magna

function u(t) {

x.globalCompositeOperation='source-out';s=2**.5;H=500;d=(S(t/3)+1)/2*H;w=H-d;x.beginPath();x.arc(C(t)*d+H*2,S(t)*d+H,w,0,7);x.fill()

May 23 2017 9:06 PM UTC

}// 132/140

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u/magna

Whoa! I had no idea about the potential effect of "source-out"...
u/mxfh

me neither ;)
u/mxfh

#arc #compositing
u/mxfh

#tunnel
u/rafroller

#moire #moiré

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mxfh

remix of d/2719 by u/keithclark

function u(t) {

for(c.width|=a=50;--a;x.arc(960+S(G+t)*400,520+C(t+G*3)*400,a%25*70,0,6.2832))x.moveTo(G=a/25|0,0)
x.fill('evenodd')

May 15 2017 1:17 PM UTC

}// 116/140

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single fill draw call with fill-rule and arbitrary computation in moveTo

u/mxfh

#arc #fillrule

dwitter.net | mxfh (1174)