Dwitter - javascript demos in 140 characters

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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f8f82804

function u(t) {

c.style.filter='invert(1)';x.fillStyle=`#2ea82e`;x.fill(new Path2D('M0 1080v-540h640a320 320 0 0 1 320-320 320 320 0 0 1 320 320h640v540'))

Jan 24 2019 12:34 AM UTC

}// 139/140

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#minimal #outrun #path2d #sunset

u/mxfh

had a habit of setting up variables in a setTransform, if only there would be a shorthand for that https://www.dwitter.net/d/2119

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katkip

remix of d/11891 by u/katkip

function u(t) {

c.width*=1;for(i=64;i--;)for(j=60;j--;)
x.fillRect(600+i*20-j*10,200+j*10+C(i*j/100-t*9)*20,10,10)

Jan 19 2019 7:46 PM UTC

}// 98/140

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#waves

u/username

Should the waves not reflect? I mean from a physical standpoint.
u/username

https://phet.colorado.edu/sims/html/wave-on-… Loose end and probably no damping
u/katkip

I don't know.

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f8f82804

function u(t) {

pauseDemo();throw t;

Jan 23 2019 10:55 PM UTC

}// 20/140

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manually-executed dweet -- scroll away and back to execute another frame

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f8f82804

function u(t) {

loop=u;throw t;

Jan 23 2019 10:54 PM UTC

}// 15/140

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single #frame dweet

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katkip

function u(t) {

x.shadowBlur=20;x.shadowColor='red',f=s=>{if(s>10)x.fillRect(960+C(s*s)*s,540+S(s*s)*s,10,10),f(s/1.1)}
f((t*t*t)%900)

Jan 23 2019 4:41 PM UTC

}// 118/140

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#virus evolving

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katkip

function u(t) {

f=(X,Y,s)=>{if(s>6)x.fillStyle=R(C(t+s)*256),x.fillRect(X-s/2,Y,s,s),f(X-s,Y,s/2),f(X,Y-s*t,s/2),f(X+s,Y,s/2),f(X,Y+s/t,s/2)};f(960,540,750)

Jan 19 2019 5:53 PM UTC

}// 140/140

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Hell #satan. #red #recursive #recursion. I still love god and hate satan

u/metamero

i loved this

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davidsharp

function u(t) {

c.width|=0;k=100;x.font=k+'px courier'
for(i=0;i<22;i++)for(j=0;j<22;j++)x.fillText('?',-k+(k*i)+(t*k)*(j%2||-1)%k,k*j)

Jan 23 2019 1:02 PM UTC

}// 119/140

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metamero

remix of d/11917 by u/Xen

function u(t) {

FPS=2;
g=(A=t>1?B+(B=A):B=1)/B
x.lineTo(t*99,1080*(2-g))
x.stroke()
throw g

Jan 23 2019 11:59 AM UTC

}// 75/140

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this graph shows the fast convergence of u/Xen 's algorithm for golden ratio

u/katkip

I don't understand anything
u/pavel

A and B are sequential Fibonacci numbers, their ratio tends to the golden ratio.

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yonatan

remix of d/9776 by u/yonatan

function u(t) {

T=f=>f(i)+f(i*i)*i**.5*t
for(i=9e3;t<4&&i--;q>9e3|q<99&t<2&&x.fillRect(960+a,540+b+t*t*2,4-t,4-t))a=T(S),b=T(C),q=((a*a)**.5-99)**2+b*b

Jan 18 2019 8:29 PM UTC

}// 135/140

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katkip

function u(t) {

c.width*=1;for(i=0;i<9;i++)for(j=20;j--;)x.fillStyle=R((o=j*7-i*3,o),o,o),x.fillRect(400+j*2+i*100+S(t)*300-S(t)*j*5,400-j*4,50,200)

Jan 19 2019 8:22 PM UTC

}// 132/140

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Most #realistic 3D #default! #d3