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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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katkip

function u(t) {

t||(q=-1);if(t>1&&q==-1){q=t-1;}throw q

Feb 5 2019 9:55 AM UTC

}// 39/140

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Scripts delay calculator, performance test, wait 1 second and look at the throw, 39bytes #application

u/katkip

37: t||(q=0);if(t>1&&q==0){q=t-1;}throw q

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23_Skidoo

remix of d/12149 by u/23_Skidoo

function u(t) {

t/=s=30
for(i=2e3;i--;x.fillStyle=R(s+S(t*9+i)*90,s+T(i-t*s)*s,06+S(i*31+t)*s,.1))x.fillRect(1E3*(C(t*7+i*99)+.94),825*(C(t*9-i)+.65),s,s)

Feb 5 2019 1:02 AM UTC

}// 138/140

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katkip

remix of d/12143 by u/katkip

function u(t) {

f=n=>Math.log(n*2-1);c.width^=0;for(i=192;i--;)for(j=9;j--;)
x.fillRect(1920-f(i)*314,1080-f(j+i+C(t+j+i/9)*9)*180,10,10)

Feb 4 2019 6:54 PM UTC

}// 121/140

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leoseccia

function u(t) {

c.width|=0;i=1080;while(i--){t+=i;x.fillRect(920+C(t)*850,i,50,3)};

Feb 4 2019 3:33 PM UTC

}// 67/140

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Xen

remix of d/11418 by u/akm

function u(t) {

for(c.width|=i=101,x.scale(20,20),t*=9;i--;)for(j=54;j--;)if((i^j)&1)x.fillRect(i+S(t+j/4),j+S(t+i/3),C(t/9),2)

Feb 4 2019 12:36 AM UTC

}// 111/140

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Xen

remix of d/12111 by u/katkip

function u(t) {

for(c.width=i=300,x.translate(150,89);i--;x.rotate(S(t/9)))x.strokeRect(-i,-i,i*2,i*2)

Feb 3 2019 8:26 PM UTC

}// 86/140

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saon

remix of d/12065 by u/elaborate

function u(t) {

c.width|=0;for(i=0;i<1200;i+=0.3){
t+=C(i);
x.fillRect(1000+S(t)*300,i,10,10)
};

Feb 3 2019 6:38 PM UTC

}// 80/140

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Try some different step values for pretty varied patterns

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ycjung

function u(t) {

for(i=0;i<20;i++){
x.fillRect(960+500*S(t*i/10),512+100*C(t*i),5,1);x.fillRect(960-90*S(t*i%10),512+90*C(t*(i%20)),1,1)}

Feb 3 2019 4:26 AM UTC

}// 120/140

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mod operator in sin/cos parameter

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23_Skidoo

remix of d/12116 by u/23_Skidoo

function u(t) {

t/=s=60
for(i=1e3;i--;x.fillStyle=R(s+T(i-t*s)*s,s+S(i*7.1+t)*40,80+9*S(t),.06))x.fillRect(1200*(C(t*5+i*7)+.9),615*(C(t*7-i*9.1)+.85),18,s)

Feb 3 2019 3:37 AM UTC

}// 140/140

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23_Skidoo

remix of d/12061 by u/23_Skidoo

function u(t) {

t/=60
for(i=2e3;i--;x.fillStyle=R(180+T(i-t*5/4)*60,0,90+T(i*7.1+t)*80,.04))x.fillRect(1200*(C(t*5+i*3.2)+.9),615*(C(t*13-i*9.1)+.9),s=30,s)

Feb 3 2019 3:26 AM UTC

}// 140/140

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