Dweets awesomed by u/zanella

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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jylikangas

function u(t) {

for(c.width=Y=W=256,t*=w=99;Y--;x.fillStyle=R(t%w,Y,w))x.fillRect(w-w/(z=Y/9)+S((v=Y+t)/w)*z*7+(v&8&&w)/z,W/z+Y*C(v/50),v/8%W>9&&W/z,Y%60/z)

Feb 27 2018 12:52 PM UTC

}// 140/140

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Enjoy the ride but watch out for the missing track pieces! :)

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u/aleamb

wow! epic!
u/zanella

Damn!!
u/sigveseb

Crazy good!
u/artfarnaa

Crazy Epic!
u/jylikangas

Thanks!
u/aleamb

#rollercoaster

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Batrachus

function u(t) {

for(c.width*=j=1;j<11;j*=10)for(a=Math.exp(t%2.3),i=-45;i<45;i++){x[f="fillRect"](d=i*20*j*a+960,0,b=5-5/a/j,1e9);x[f](0,d-420,1e9,b)}

Feb 27 2018 1:18 AM UTC

}// 134/140

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u/joeytwiddle

Calculus
u/Batrachus

Don't know why I used exp, when I could have used pow
u/BirdsTweetCodersDweet

Pow doesn't work on Chrome for me for some reason
u/joeytwiddle

#infinite #loop

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yonatan

function u(t) {

x.fillRect(0,0,1,1)
x.drawImage(c,t&3?0:960,t&1?0:540,960,540)

Feb 26 2018 8:20 PM UTC

}// 62/140

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give it a few seconds

u/Xen

nicely done, i have a 58bytes on here somewhere but smaller image

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Batrachus

function u(t) {

a=1920
c.width+=0
x.fillRect(0,0,a,a)
for(i=0;i<a;i++){e=2+C(i*i)
d=(t+9)*e*a/30
x.clearRect((S(i)*a+d)%a,(T(i)*a+d*4)%a,3*e,3*e)}

Feb 26 2018 5:29 PM UTC

}// 130/140

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u/UEZ

#snowfall

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jylikangas

function u(t) {

c.width=W=512;for(i=W;i--;h=W/d,x.fillRect(i,99-h/2,2/d,h))for(d=1,X=97,Y=t*9;C((X>>3)*(Y>>3))<.9;d+=.06)X+=C(t+i/W),Y+=S(t+i/W)
//B.J.=lost

Feb 25 2018 10:56 AM UTC

}// 140/140

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My 1st dweet - some Wolfenstein 3D fun. :)

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u/aleamb

nice!!!
u/BirdsTweetCodersDweet

What's up with that weird comment at the end?
u/jylikangas

B.J. is the main character from Wolfenstein and in the demo he is obviously lost. Thus the code is properly commented. :)
u/cantelope

looks familiar :P https://www.dwitter.net/d/2961
u/jylikangas

Wolfenstein tributes should look familiar. :) p01 is a legend!
u/iverjo

Wow!
u/iverjo

#wolfenstein

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dogspace

function u(t) {

x.font="200px e"
for(i=0;i<9;i++)for(j=0;j<14;j++)x.fillText(['🐕','🐩','🌭', '💩'][(i+j)%4],700+T(t)*i*100,j*200)

Feb 24 2018 7:29 PM UTC

}// 110/140

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dogspace

u/zanella

zanella

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BuRRak

function u(t) {

t||(A=S=K=L=G=0);onkeydown=e=>self[e.code[3]]+=10;x.fillRect(S-A,L-K,10,10);G==0||(c.width|=G=0)

Feb 24 2018 5:08 PM UTC

}// 96/140

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Etch a Sketch, AS - left knob CCW and CW, KL - right knob CCW and CW, G - shake

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u/snydej

I haven't figured out why yet but once I press "[" or "]", G stops working but A, S,K, and L still work.
u/BuRRak

Yeah, i have that issue too. Very weird
u/zanella

It's because, when you hit [ or ], e.code[3] evals to c (fourth letter in BracketLeft and BracketRight). Then, self[c] overrides the c variable, which is the reference to the canvas, and because of that c.width|= stops working. The other keys still work because x still points to the canvas context, which is what draws the rectangles. ;)
u/zanella

You can fix this and also code golf 4 characters:
u/zanella

t||(a=s=k=l=g=0);onkeydown=e=>self[e.key]+=10;x.fillRect(s-a,l-k,10,10);g==0||(c.width|=g=0)
u/snydej

zanella: I'll give you the golf, but it's not a fix. It'll break if you press x or c. Not that I care too much; this dweet is quite clever even if no one should ever do this in practice.
u/snydej

Btw thanks for the explanation :) Also I golfed 9 more characters off it: t?g?c.width|=g=0:onkeydown=e=>self[e.key]+=10:a=s=k=l=g=0;x.fillRect(s-a,l-k,10,10)
u/zanella

u/snydej You're right, it's not a fix if it breaks something else. :D And I agree, this dweet is totally ingenious!
u/zanella

The unavoidable remix: https://www.dwitter.net/d/7102

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snydej

remix of d/7060 by u/snydej

function u(t) {

for(T(0,i=4e3,.06);r=--i**4.3;T(t**(i<9?9:i<30)*200+r,a=r%5*S(i+t)**2,51*a))T=(w,s,a)=>x.fillRect(w*2%2e3,w%1079,s,s,x.fillStyle=R(a,a,a,a))

Feb 24 2018 2:52 AM UTC

}// 140/140

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Golfed this one better and added a few details, like differing star sizes.

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u/DirtyDan

Cool!
u/snydej

Feature request: When in fullscreen center the canvas and fill unused space with black. I'm guessing the white background is there in case the dweet has transparency. Would it be possible to put the canvas in a div with a white background and put a black background behind that?
u/New_Core

Did you want t?0:c.height=2e3 infront of your dweet and expand the w%1079 number by a few 100?
u/snydej

It'd be nice but I don't have the room to add it to this dweet. I'm sure some dweets do that and so I tried to suggest a fix that wouldn't break that behavior.
u/AnnanFay

"When in fullscreen center the canvas and fill unused space with black" This seems like it would break many dweets.
u/snydej

By unused space I mean the space OUTSIDE the canvas. This is pretty standard behavior when fullscreening anything.
u/snydej

For instance, d/6967. On my monitor the canvas does not extend to the bottom of the screen in fullscreen mode and there is a white bar running along the bottom. This makes the dweet look cut off. If it were a black bar it would look fine because the screen would just look dark there. This is how everything from TVs to YouTube deal with fullscreening when the source material that has a different aspect ratio from the screen.
u/snydej

by d/6967 above I meant https://www.dwitter.net/d/6967 I think the period messed up the link
u/snydej

Actually it looks like the canvases already their background color set to white (I had assumed that the background was not set and that setting it would change the rendering of some dweets, but it looks like that's not the case.) So you wouldn't even need the additional div that I suggested originally.
u/Renaud___

Beautiful
u/aleamb

amazing
u/joeytwiddle

I think the canvas is transparent by default, the white is just the page behind it.
u/snydej

Nope, that's what I thought too. The image data within the canvas is initially transparent (this affects the rendering of dweets that call x.drawImage(c, ... ) but there is also a background css property on the canvas that is set to white and this causes transparent areas of the canvas to show up as white regardless of what's behind them. You can try this out by locally tweaking the css for the body element that contains the canvas. On most dweets you don't see any part of this element unless the dweet is fullscreened but there are exceptions like d/7084 . I don't know what the best way to handle that would be.
u/donbright

:)
u/iverjo

#stars
u/joeytwiddle

#landscape #scene
u/larzuk

quite impressive!
u/vain

nice night sky with shooting stars. just incredible work

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SigmaSquared

function u(t) {

pt=[[960,0],[0,1080],[1920,1080]][~~(Math.random()*3)]
p=(t==0)?[0,0]:[p[0]+(pt[0]-p[0])/2,p[1]+(pt[1]-p[1])/2]
x.fillRect(p[0],p[1],5,5)

Feb 24 2018 12:08 AM UTC

}// 137/140

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DirtyDan

remix of d/7051 by u/DirtyDan

function u(t) {

with(x)for(i=32;i-->2;)fillStyle=`hsl(${i*t*9},100%,50%)`,lineWidth=i*2,beginPath(arc(960+C(a=t*i/3)*i,540+S(a)*i,i*i/2,0,7),fill(stroke()))

Feb 23 2018 2:34 AM UTC

}// 140/140

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u/aleamb

beautiful!
u/fons

dope
u/zanella

Nice color palette!
u/iverjo

Good colors indeed
u/Xen

love it

dwitter.net | zanella (15549)