Dweets by u/PhiLho

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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PhiLho

function u(t) {

c.width=W=400;D=16;H=D/2-1;
for(h=W;h-=D;)for(v=W;v-=D;){s=H*C(t*h/30);n=H*S(t*v/30);x.moveTo(h+s,v+n);x.lineTo(h-s,v-n);x.stroke()}

Jul 22 2016 2:24 PM UTC

}// 132/140

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u/iverjo

This runs at 2-3 FPS in Firefox on my laptop because of the missing x.beginPath(). Here's a version that runs at a much higher framerate: c.width=W=400;for(h=W;h-=16;)for(v=W;v-=16;){s=7*C(t*h/200);n=7*S(t*v/200);x.beginPath();x.moveTo(h+s,v+n);x.lineTo(h-s,v-n);x.stroke()}
u/PhiLho

Good to know, thanks.

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PhiLho

function u(t) {

c.width=W=400;D=16;H=D/2-1;
for(h=W;h-=D;)for(v=W;v-=D;){s=H*C(t+v);n=H*S(t+h);x.moveTo(h+s,v+n);x.lineTo(h-s,v-n);x.stroke()}

Jul 22 2016 2:17 PM UTC

}// 126/140

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PhiLho

function u(t) {

c.width=500;i=t%176;a=i<86?0x3041+i:0x30A1+i-86;x.fillText(~~i,20,20);x.font="120px Arial";x.fillText(String.fromCharCode(a),200,180)

Jul 22 2016 11:53 AM UTC

}// 133/140

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Educational: hiragana and katakana...

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PhiLho

function u(t) {

c.width=W=200;if(!t){R=Math.random;N=999;H=99;A=Array(N).fill(0).map(v=>R()<.1?R()*H:0)}for(i=0;i<W;i++)h=A[~~(i+t)%N],x.fillRect(i,H-h,2,h)

Jul 21 2016 4:30 PM UTC

}// 140/140

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Will not work on old browsers, as I used some ES6 for brevity...

u/PhiLho

At least, works on latest Chrome and Firefox... Ah, and Edge too!

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PhiLho

function u(t) {

c.width=400;for(i=0;i<42;i++){b=10+i*4.7;x.beginPath();x.moveTo(0,b);for(j=0;j<22;j++){x.lineTo(i+j*16,b+C(j+16+t%7)*i/2);x.stroke()}}

Jul 21 2016 12:29 PM UTC

}// 134/140

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PhiLho

remix of d/246 by u/PhiLho

function u(t) {

M=255;s=5;for(h=0;h<1920;h+=s)for(v=0;v<1080;v+=s){b=M*C(h/1222);g=M*S(v/687);r=M*(1+S(t*7))/2;x.fillStyle=R(r,g,b);x.fillRect(h,v,s,s)}

Jul 20 2016 1:29 PM UTC

}// 136/140

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Show more comments…
u/iverjo

Nice colors, but low frame rate
u/iverjo

Try lowering the resolution
u/PhiLho

Thanks, but I wanted it slow... :-) Change s value to higher value for faster rendering.
u/iverjo

To make it more clear: I like the slow pace, but not the performance hog ;)
u/iverjo

Here's a less performance-intensive version: c.width=96;M=255;for(h=96;h--;)for(v=54;v--;x.fillStyle=R(M*(1+S(t))/2,M*S(v/34.4),M*C(h/61.1)),x.fillRect(h,v,1,1))
u/iverjo

It should still be smooth and slow-paced
u/iverjo

The previous code might not work.. here's an alternative version that probably works: c.width=96;M=255;for(h=96;h--;)for(v=54;v--;){x.fillStyle=R(M*(1+S(t))/2,M*S(v/34.4),M*C(h/61.1)),x.fillRect(h,v,1,1)}

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PhiLho

function u(t) {

c.width=W=300
p=new Path2D("M0 0L30 10L0 20L15 10Z")
x.translate(t*50%W,50+10*C(t*9))
x.fillStyle=R(0,99,128*(1+C(t)))
x.fill(p)

Jul 20 2016 12:09 PM UTC

}// 129/140

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u/iverjo

This is the first dweet that uses Path2D AFAIK. Cool!
u/PhiLho

Thanks. The "new " syntax makes its usage costly. P=Path2D helps for multiple paths...

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