Hot dweets by u/andrea270872

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: #Opposites

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andrea270872

function u(t) {

c.width|=0
P=t?P.map(([i,j,z,v])=>[i,j,z?z-1:99,x.fillRect(1e3+1e3*i/z,500+500*j/z,z=500/z,z)]):[]
P[99]||P.push([t*97%11-5,t*79%11-6,99])

Mar 16 2019 2:22 PM UTC

}// 138/140

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asteroid shower (still working on getting the forLoop trick from #pavel :> )

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andrea270872

function u(t) {

for(c.width|=K=k=1e3;k--;z>0&&x.fillRect(K+(k*97/60%11-5)*K/(99-z),500+(k*89/60%13-6)*K/(99-z),8,8))z=(60*t-k)%99

Mar 16 2019 2:32 PM UTC

}// 113/140

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star field (using the forLoop suggestion)

u/Xen

nice

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andrea270872

function u(t) {

c.width|=r=Math.random
A=[r()-.5,r()-.5,99,1]
P=t?P.map(([i,j,z,v])=>[i,j,z?z-v:99,v,x.fillRect(1e3+z/i,500+z/j,8,8)]):[A]
P[99]||P.push(A)

Mar 15 2019 7:30 PM UTC

}// 139/140

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Remove the drain stopper

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andrea270872

function u(t) {

V=t?V:4
X=t?X+V:8
V*=(4<X&X<180)?1:-1
c.width=192
a=50+S(t)*50
b='fillRect'
x[b](2,a-5,3,9)
x[b](185,a-2,3,9)
x[b](X,a,3,3)

Mar 15 2019 10:27 AM UTC

}// 123/140

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Pong for 2 (locally declared, global variable)

u/Jezza

Simple but effective! I like it!
u/Jezza

You can: b=x.fillRect;
u/Jezza

And then b(2,a-5,3,9) etc

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andrea270872

function u(t) {

c.width|=K=1e3
A=[(t*97%11-5)*K,(t*89%13-6)*K,0]
P=t?P.map(([i,j,z,v])=>[i,j,(z+1)%99,x.fillRect(K+i/z,500+j/z,8,8)]):[A]
P[K]||P.push(A)

Mar 15 2019 7:43 PM UTC

}// 137/140

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Remove the drain stopper v2

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andrea270872

function u(t) {

c.width|=r=Math.random
x.canvas.onclick=e=>{P=[500,500,r()*5-2,-r()*10]}
[I,J,U,V]=P
P=t?[(I+U)%2e3,J+V,U,V+.1]:0
x.fillRect(I,J,8,8)

Mar 15 2019 5:58 PM UTC

}// 133/140

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Shoot a particle (click anywhere on the canvas)

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andrea270872

function u(t) {

$=t*97%11*180
H=t*500%1080
x.fillStyle=R(t*10%255,$/4,$/2,.4)
x.setTransform(1,0,0,1,$,H),x.rotate(t/3)
x.fillRect(0,0,50,50)

Mar 9 2019 3:21 PM UTC

}// 125/140

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gradient crystal scales ver2 (shorter thanks to a great suggestion)

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andrea270872

remix of d/12707 by u/rsrsrs

function u(t) {

for(c.width|=i=50,k=75;i--;x.rect(960-(i*k/2),540-(i*k/2),i*k,i*k))x.setTransform(1,0,0,1,500,250)*x.rotate(S(1+i*t/500));x.fill('evenodd')

Mar 9 2019 7:31 PM UTC

}// 139/140

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a more centered rotation (perhaps :> )

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andrea270872

function u(t) {

I=t*3320%2e3;J=t*94%1e3
i=A=I/2e3;B=J/1e3
for(;i++<13;[A,B]=[A*A-B*B+.3,2*A*B],C=A*A+B*B)
x.fillStyle=R(C*200,0,0,.3)
x.fillRect(I,J,i*=4,i)

Mar 7 2019 8:26 PM UTC

}// 140/140

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Ghost of Julia ver5 (in red)

u/f8f82804

#fractal
u/13thptr

weird rendering:I love it :)
u/andrea270872

thanks... I had to cut a lot of corners to even get something looking like that :D
u/13thptr

#scanline
u/Xen

love it!

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andrea270872

function u(t) {

c.width|=j=72
for(;j-=9;x.lineWidth=C(j)*90){
x.beginPath()
for(i=21;i--;)x.lineTo(i*99,S(t*5+i)*40+(j*11+t*500)%1e3),x.stroke()}

Mar 9 2019 6:07 PM UTC

}// 129/140

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Returning waves ver2

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