Top #composite dweets

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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f8f82804

function u(t) {

with(x)for(i=c.width=396;i--;fillText('👻',99*(i?2+S(i%47+t):1),72*(i?2+C(t-i):3)))i||(font='5cm a',globalCompositeOperation='source-atop')

Oct 9 2018 5:44 PM UTC

}// 138/140

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ᴇ ᴛ ʜ ᴇ ʀ ᴇ ᴀ ʟ

u/aleamb

cool!
u/joeytwiddle

What the? :-O #ghost #halloween
u/katkip

woow
u/f8f82804

#emoji #composite

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yonatan

remix of d/10836 by u/magna

function u(t) {

for(p in x)this[p[0]+p[6]]=p;i=192;t||(c.width=i);x[gC]='hue';for(x[da](c,0,1);i--;x[fc](i,0,1,1))a=u[i]||0,x[fy]=`hsl(${u[i]=a+i} 99%50%`

Nov 4 2018 10:57 PM UTC

}// 138/140

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Take that, globalCompositeOperation!

u/magna

Waaaat!? Nice!
u/f8f82804

#composite

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f8f82804

function u(t) {

with(x)for(globalCompositeOperation='color',s=192,i=9;shadowBlur=i*i--;fillRect(864+s*S(t),444+s*C(t*3),s,s))shadowColor=`hsl(${t*s} 85%45%`

Oct 8 2018 7:54 PM UTC

}// 140/140

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#composite #glow #color

u/donbright

fascinating effect

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f8f82804

remix of d/10293 by u/f8f82804

function u(t) {

with(x)for(i=c.width=320;i--;fillText('👹',155*(i?1+S(i^3*t):.4),90*(i?1+C(t-i):1.8)))i||(font='5cm a',globalCompositeOperation='xor')

Oct 10 2018 5:07 PM UTC

}// 133/140

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complex #emoji give interesting results with some #composite operations, at least in Firefox

u/f8f82804

It looks like each shape is drawn in a separate pass, which causes strange results! The only alternative would be to render the glyph to an off-screen canvas and then paint the image with appropriate compositing. This is hard to do in 140 chars!
u/f8f82804

update: on Firefox Android, the font rendering behavior is different

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f8f82804

remix of d/10286 by u/f8f82804

function u(t) {

with(x)for(globalCompositeOperation='color',translate(C(t),S(t/5)),i=9;shadowBlur=i--;fillRect(912,i,96,96))shadowColor=`hsl(${t*48} 85%45%`

Oct 8 2018 10:43 PM UTC

}// 140/140

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more #composite #glow #color #fun

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