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.

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Current theme challenge: #Food

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Xen

remix of d/12583 by u/Xen

function u(t) {

for(c.width|=i=135;i--;x.arc(960+C(t*27+i/(t%8+2))*9,540+S(t*29+i/3)*9,9*i,0,x.lineWidth=9))x.beginPath(x.stroke())

Mar 1 2019 10:31 PM UTC

}// 115/140

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zanella

remix of d/12556 by u/Ath0r

function u(t) {

c.width|=0
f=(i,j)=>{x.beginPath(),x.lineWidth=j,x.ellipse(960,560,...i),x.stroke()}
f([r=300,r,0,0,7],9)
f([780,99,9+t,1.945,1.195],35)

Feb 28 2019 10:16 PM UTC

}// 136/140

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u/donbright

wheeeeeeee

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pavel

function u(t) {

for(c.width|=p=300;e=p--**.9%1;x.fillRect(960+r(0)/z,200+99/z,s=9*e/z,s))r=d=>p/(1+e*C(a=t/4+p))*C(a+p+d)+2*p/(1/e-e)*C(p+d),z=.5+r(1.6)/800

Feb 28 2019 6:54 AM UTC

}// 140/140

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Galaxy

u/pavel

300 bodies which individually only interact with an infinite mass at the center
u/pavel

Each body moves around an ellipse, the orbits are accurate. However, the movement speed is a very rough approximation.
u/pavel

Naively drawing an ellipse centers it around one of the focal points, however moving a body on this path slows the body down near this focal point and speeds it up near the other one.
u/pavel

The opposite effect is needed. So this code still moves a body around an ellipse but it re-centers the ellipse on the 'other' focal point.
u/pavel

In polar coordinates the difference between the x and y coordinates is a phase shift of pi/2 ~ 1.6

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pavel

function u(t) {

for(c.width|=i=99;S[u[t]=t]=x[t]=i--;x.fillRect(960+(u[i]+=S[i]-=u[i]/d),540+(x[i]+=C[i]-=x[i]/d),C[t++]=9,9))d=(u[i]**2+x[i]**2)**1.5/7e3

Feb 28 2019 5:17 AM UTC

}// 138/140

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#physics #orbit #orbits

u/pavel

Funky start due to lack of chars but quickly settles. Imagine a black hole in the middle.

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Ath0r

function u(t) {

c.width=1920
p=[a=960,a/3]
w=i=>[a+300*C(z=t+2.09*i),800+100*S(z)]
f=i=>x.lineTo(...i)
for(i=6;i--;){b=f(w(i));f(p);f(w(i))}
x.stroke()

Feb 26 2019 9:07 PM UTC

}// 135/140

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My first dweet (simple pyramid)

Show more comments…
u/katkip

Nicee
u/Ath0r

Thanks! It's the first time I've tried, so probably I missed a lot of tricks to reduce characters... Any feedback or tips are welcome! :D
u/13thptr

b is unused so you can remove it :)
u/13thptr

nice dweet btw
u/13thptr

127:c.width=1920 w=i=>[960+300*C(z=t+2.09*i),800+100*S(z)] f=i=>x.lineTo(...i) for(i=6;i--;)f(w(i)),f([960,320]),f(w(i)) x.stroke()
u/13thptr

ugh sorry here it is with semicolons instead of newlines
u/13thptr

c.width=1920;w=i=>[960+300*C(z=t+2.09*i),800+100*S(z)];f=i=>x.lineTo(...i);for(i=6;i--;)f(w(i)),f([960,320]),f(w(i));x.stroke()
u/Ath0r

Thanks a lot for the suggestions, @13thptr! Indeed, I forgot to remove the unused b and the characters you remove by avoiding the definition of p is also very nice :)
u/tomxor

It's a spinning simplex!! :D great 1st dweet
u/Ath0r

Thanks @tomxor :D
u/f8f82804

#d3 #wireframe

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rrlyrae

function u(t) {

eval(unescape(escape`𩡯𬠨𨰮𭱩𩁴𪁼👩👡👢🐱𞱩🀵𞱩𚰫𚑻𫐽𜱥𝀪𚁩𛐱𚐯𪐪𚠶𞱡𚰽𫐪𤰨𭀯𞐪𪐪𚠳𚐻𨠫👭𚡃𚁴𛰹𚡩𚠪𜰩𞱬🐲𝐵𛱩𛱩𞱦𫱲𚁲🐱𞱲🠮𜐻𬠭🐮𜐩𮱸𛡢𩑧𪑮𤁡𭁨𚀩𞱸𛡡𬡣𚀹𝠰𚱡𛀵𝀰𚱢𛀳𜀰𛱩𚠪𜰪𬠬𜀬𜐰𚐻𮀮𩡩𫁬𤱴𮑬𩐽𤠨𫀬𫀬𫀪𬠩𞱸𛡦𪑬𫀨𚑽𯐠`.replace(/u../g,'')))

Feb 28 2019 3:34 PM UTC

}// 140/140

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#compressed #solar system: #planets and #moons with approximate constant density planetary bodies

u/rrlyrae

Uncompressed, you can change "i<5" to whatever you want to have as many mini-moons orbiting about your moon as you want :)

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sdavey

function u(t) {

c.width=1920;x.font='200px x';
for(i=0;i<190;i++)
x.fillText(String.fromCharCode(129),i*Math.sqrt(i*t),S(t)*i+S(i*2+i)*200+500);

Mar 1 2019 10:52 PM UTC

}// 128/140

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sdavey

function u(t) {

c.width=4000;c.height=2100;x.font='99px x';
for(i=0;i<1190;i++)
x.fillText(String.fromCharCode(180+i),i*Math.sqrt(i*t),t/i-C(t+i)*690+1000);

Mar 1 2019 10:51 PM UTC

}// 140/140

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django

function u(t) {

s=i=>i+1;a=1920,c.width=a;for(i=0;i<a;)y=.5,p=C(3*(t+i)),x.fillRect(y*a*s(S(t-i)),540*(S(t+i)*S(t*i*1e-3)*s(p)/4+s(y*(S(i++)-p))),10,10)

Mar 1 2019 4:33 AM UTC

}// 136/140

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coherence

u/gerzytet

welcome to Dwitter

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WasifBoomz

function u(t) {

z=1920
y=1080
c.width=z
x.lineWidth=z
x.strokeRect(0,0,z,y)
x.fillStyle=R(z)
if(t==0)a=b=9
a+=50
if(a>2120){a=-200
b+=8}
x.fillRect(a,0,b,y)

Mar 3 2019 1:41 AM UTC

}// 140/140

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