Dweets by u/rileyjshaw

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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rileyjshaw

function u(t) {

for(i=0;(i+=3/t)<1;x.beginPath(),x.arc(860,540,1e5*(1-i)*S(t/999),0,i*6))x.fill()

Aug 3 2019 10:37 PM UTC

}// 81/140

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rileyjshaw

remix of d/2602 by u/rileyjshaw

function u(t) {

t*=s=60
x.beginPath()
for(x.globalAlpha=.1;t&&o<t;x.lineTo(m+q,S(o)*o+q))m=C(o+=.04)*o,q=S(2*m/s)*s
x.fill()
o=t

Aug 3 2019 10:19 PM UTC

}// 112/140

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rileyjshaw

remix of d/2619 by u/rileyjshaw

function u(t) {

c.width|=0
x.globalCompositeOperation=C(t*=2)<0&&'xor'
for(i=2;i--;x.fill())
x.beginPath(),x.arc(960-S(t)*540*i,540,(2-i)*100,0,7)

Apr 27 2017 3:47 PM UTC

}// 130/140

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Bit of golf…

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rileyjshaw

remix of d/2610 by u/rileyjshaw

function u(t) {

c.width|=0
x.globalCompositeOperation=C(t*=2)<0&&'xor'
x.arc(X=960,Y=540,3e2,0,7)
x.fill()
x.beginPath()
x.arc(X-S(t)*Y,Y,1e2,0,7)
x.fill()

Apr 27 2017 2:10 PM UTC

}// 139/140

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Orbit

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rileyjshaw

function u(t) {

c.width|=0;for(X=2e3;X-=40;)for(Y=2e3;Y-=40;s=(1+T(C(X/40+t)*C(Y/3+t)))*20,s=s<34?0:s,x.fillRect(X-s/2,Y-s/2,s,s))x.fillRect(X+19,Y+19,2,2)

Apr 27 2017 6:53 AM UTC

}// 139/140

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rileyjshaw

function u(t) {

if(!t)for(i=1e6;i--;X=i%1e3,Y=i/1e3,x.fillStyle=`hsl(${~~T(X*Y)},40%,40%)`,x.fillRect(460+X,40+Y,1,1));

Apr 27 2017 4:39 AM UTC

}// 103/140

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Film grain effect (may take a few seconds to render)

u/rileyjshaw

(Looks nicer fullscreen)

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rileyjshaw

remix of d/2603 by u/rileyjshaw

function u(t) {

r=255
t||x.fillRect(0,0,2e3,2e3)
x.strokeStyle=R(r,r,r,.004)
n=Math.random(x.stroke())*7
x.lineTo(960+C(n)*r,540+S(n)*r)
n<.1&&x.beginPath()

Apr 27 2017 4:09 AM UTC

}// 140/140

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Full moon

u/rileyjshaw

Some browsers might need a higher alpha, eg. x.strokeStyle=R(r,r,r,.006)

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rileyjshaw

function u(t) {

c.width|=0
x.globalCompositeOperation='xor'
x.arc(S(t)*600+960,540,3e2,0,7)
x.fill()
x.beginPath()
x.arc(S(-t)*600+960,540,1e2,0,7)
x.fill()

Apr 26 2017 9:11 PM UTC

}// 140/140

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rileyjshaw

remix of d/2608 by u/rileyjshaw

function u(t) {

c.width|=0
for(i=-9;i++<99;x.globalCompositeOperation='xor')x.fillRect(i*30,0,S(t/3)*99,2e3)
while(i--)x.fillRect(0,i*15-99,2e3,C(t/5)*40)

Apr 26 2017 8:59 PM UTC

}// 138/140

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Looks nice with themes, eg:

u/rileyjshaw

c.style.background='#000';x.fillStyle='#080'

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rileyjshaw

function u(t) {

c.width|=0

for(i=-2;i++<20;x.globalCompositeOperation='xor')x.fillRect((i+S(t))*99,0,80,2e3)
while(i--)x.fillRect(0,(i-1-C(t/3))*60,2e3,80)

Apr 26 2017 8:51 PM UTC

}// 140/140

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lissajous, kinda

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