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: #Food

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andrea270872

remix of d/12771 by u/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,z,z)]):[A]
P[K]||P.push(A)

Mar 15 2019 7:44 PM UTC

}// 137/140

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Build-up!

Show more comments…
u/Xen

love it
u/pavel

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

Looks like the code you started with used Math.random at each step which made the ultimate position of each square at time 't' impossible to determine directly. Switching to instead use any function of just t makes it quite simple so there is no need to initialize stuff at time 0 and keep it updated.
u/pavel

I learned that in d/11421 to save chars and make d/11424
u/andrea270872

great. thanks very much
u/andrea270872

In my head I was thinking also that t*97%11 is a pseudo-random generator...
u/katkip

Satisfying

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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
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) {

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) {

c.width|=r=Math.random
A=[K=500,K,r()*5-2,-r()*10]
P=t?P.map(([i,j,u,v]=e)=>[(i+u)%2e3,j+v,u,v+.1,x.fillRect(i,j,8,8)]):[A]
P[K]?0:P.push(A)

Mar 15 2019 11:30 AM UTC

}// 140/140

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Particle Fountain, variable number of particles, max 500, non-repeating

u/andrea270872

Thanks to LimeLaser for the examples on the use of arrays!
u/katkip

#firework
u/LimeLaser

This is great, I dig it!

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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

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) {

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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andrea270872

remix of d/12711 by u/andrea270872

function u(t) {

for(c.width|=j=99;j-=9;){
x.beginPath()
x.moveTo(2e3,Y=t*500%2e3-j*11)
for(i=21;i--;x.lineTo(i*99,Math.random()*(80-j)+Y))x.stroke()}

Mar 9 2019 5:45 PM UTC

}// 133/140

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beach

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andrea270872

function u(t) {

for(c.width|=j=99;j-=9;x.lineWidth=j/9){
x.beginPath()
x.moveTo(2e3,Y=t*500%2e3-j*11)
for(i=21;i--;x.lineTo(i*99,S(t*5+i)*40+Y))x.stroke()}

Mar 9 2019 5:38 PM UTC

}// 139/140

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Returning waves

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