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.

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Current theme challenge: #Opposites

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andrea270872

function u(t) {

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

Mar 8 2019 2:17 PM UTC

}// 135/140

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gradient crystal scales

u/Xen

nice
u/pavel

x.setTransform(1,0,0,1,$,H),x.rotate(t/3) avoids save/reset
u/andrea270872

cool, thanks

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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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andrea270872

function u(t) {

c.width|=q=25
p=q*q*t%2e3
D=(c,d)=>4e3/Math.sqrt((z-c)**2+(w-d)**2)
for(i=0;i++<q*q;)x.fillRect(z=~~(i/q)*95,w=i%q*60,m=D(p,450)+D(800,p),m)

Mar 8 2019 9:51 AM UTC

}// 140/140

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2 swimming magnets

u/13thptr

#metaballs
u/andrea270872

I see what you mean :) I was thinking of Coulomb law
u/f8f82804

#halftone #dither

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andrea270872

remix of d/12677 by u/andrea270872

function u(t) {

I=(t*3350)%2e3;J=(t*94)%1e3
A=I/900-1;B=J/500-1
i=0;while(((A*A+B*B)<4)&&(i<25))[A,B]=[A*A-B*B-.8,2*A*B+.2,i++]
x.fillRect(I,J,i*=2,i)

Mar 7 2019 5:38 PM UTC

}// 134/140

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Ghost of Julia ver3

u/f8f82804

#dither #halftone #fractal

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andrea270872

function u(t) {

I=t*3320%2e3;J=(t*94)%1e3
i=A=I/520-2;B=J/520-1
while((A*A+B*B<4)*(i++<40))[A,B]=[A*A-B*B+.3,2*A*B+.02]
x.globalAlpha=.6
x.fillRect(I,J,i,i)

Mar 7 2019 6:22 PM UTC

}// 140/140

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Ghost of Julia ver4 (with alpha!)

u/f8f82804

#dither #halftone #fractal

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andrea270872

function u(t) {

I=(t*3350)%2e3;J=(t*94)%1e3
A=I/1e3-1;B=J/600-1
i=0;while(((A*A+B*B)<4)&&(i<25))[A,B]=[A*A-B*B-.8,2*A*B+.2,i++]
x.fillRect(I,J,i,i)

Mar 7 2019 5:29 PM UTC

}// 131/140

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Ghost of Julia ver2

u/andrea270872

/* LOGIC The point (I,J) depends on t and scans the screen from top-left to bottom-right, then restarts. It also hops of circa 50 pixels in both directions. The point (A,B) is a scaled and translated version of (I,J); (A,B) is centered arund (0,0) and goes approximately from -1,5 to +1.5 in both directions. The loop is a simplified version of the Julia iterated fractal loop: - i starts from 0, and goes max to 25 iterations, and the point starts at z=A+i*B - the function being computed is: Z=Z^2+(-0.8,+0.2) separating real and imaginary part, the formula is: A = A*A-B*B-.8 AND B = 2*A*B+.2 and the notation [A,B] saves me from using a temp variable. The loop exits if: - i is 25 or - distance of (A,B) from (0,0) is more than 2 */
u/f8f82804

#dither #halftone #fractal

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andrea270872

function u(t) {

u.x=u.x+u.v||8
u.v=u.v||4
u.v*=(4<u.x&u.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](u.x,a,3,3)

Mar 5 2019 4:41 PM UTC

}// 139/140

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PerfectPong for 2

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andrea270872

function u(t) {

K=55
T=t*60*K
I=T%2e3
J=(T/2e3*K)%1e3
A=I/1e3-1,B=J/600-1
for(i=0;i<15;i++)[A,B]=[A*A-B*B-.8,2*A*B+.2]
if((A*A+B*B)<99)x.fillRect(I,J,K,K)

Mar 7 2019 12:47 PM UTC

}// 138/140

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Ghost of Julia

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andrea270872

function u(t) {

u.x=u.x+u.v||80
u.v=u.v||9
u.v*=(4<u.x&u.x<980)?1:-1
c.width=1e3
a=250+S(t)*250
b='fillRect'
x[b](2,a,9,50)
x[b](985,a,9,50)
x[b](u.x,a,9,9)

Mar 6 2019 8:54 AM UTC

}// 140/140

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PerfectPong for 2 (high res)

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