New #RRGGBBAA dweets

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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danny@hille.dk

remix of d/21455 by u/Qwitter

function u(t) {

x.fillStyle='#0001'
x.fillRect(0,0,m=2e3,m)
for(i=399;i--;x.clearRect((1+(t%40>5))*(D=540)+(A=D/(t%5))*S(i+t),D+A*S(t+S(i-t)),A/9,A/9));

Jan 28 2021 5:35 PM UTC

}// 136/140

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Well... it's a remix :-)

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u/Qwitter

cool!
u/smtsjhr

wow @ u/danny@hille.dk i was working on something with similar output, but using x.lineTo ! i will share soon, but its over 140 maybe you can help me golf please : )
u/smtsjhr

clever x.clearRect trick! its like you are "erasing" what you intend to draw! ...and it seems interchanging x.clearRect and `x.fillRect' in your code looses the blur effect hmm!
u/smtsjhr

@ u/danny@hille.dk check out d/21499
u/danny@hille.dk

.fillStyle='#0001' sets fill color to black with a transperancy of 16% (this css shorthand hex color notation, denotates color in 4*8bit RGBA, it is in essence the same thing as the standard #RRGGBBAA notaion, but with less resolution) fillRect then fills the intire screen with that blackish color then clearRect is used to "paint" white squares (the main reason is so you only have to use fillStyle once) When the main loop runs again - the white squares are only mostly paintet (84%) over, which results in a kind of motion-blur/glow As far as i know, you cannot use this technique with lineTo since line uses strokeStyle to draw linecolors
u/smtsjhr

u/danny@hille.dk thanks for all the info!

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iverjo

remix of d/521 by u/BriSeven

function u(t) {

c.width=1920;for(i=0;i<16;i++)x.fillStyle="#"+(i*292813798>>>0).toString(16),x.fillRect(i*160+S(t)*300-300,0,161,1080)

Dec 20 2016 1:22 PM UTC

}// 118/140

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I used Zero-fill Right Bit Shifting to limit the color to 32 bits. This will only work in modern browsers with support for the new hexadecimal RGBA notation: #RRGGBBAA

u/lionleaf

Still haven't seen this in a browser where it works. Chrome on MacOS and Firefox on Ubuntu so far.
u/iverjo

Works in FF for me. Also, Chrome has a blog post about this and says it should work in Chrome 52. Yet it doesn't work in my Chrome 55 on Windows
u/iverjo

Also doesn't work in Edge
u/iverjo

I guess CSS4 isn't ready for prime time yet :P
u/BirdsTweetCodersDweet

#tagfail

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