New #wavelet 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.

Try the new frontend: beta.dwitter.net
Current theme challenge: #ScaryMovies

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rodrigo.siqueira

remix of d/17854 by u/rodrigo.siqueira

function u(t) {

for(c.width|=Z=0;Z<16;Z++)for(X=-5;X<=5;X+=.02)Y=S(t*3)*(1-X**2)*3**-(X**2)*S(Z/5+t*8)-2,x.fillRect((X+5)*169+Z*15,Z*15-Y*230,4,4)

Aug 21 2020 11:26 PM UTC

}// 130/140

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Wavelet animation loop #wavelet

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rodrigo.siqueira

remix of d/17743 by u/rodrigo.siqueira

function u(t) {

for(c.width|=Z=0;Z<27;Z++)for(X=-3;X<=3;X+=.02)
Y=Math.exp(-X*X)*S(S(X-t*4)*3+Z/7+C(Z/4+t))-1,
x.fillRect((X+4)*260-Z*9,Z*26-Y*150,5,4)

Mar 6 2020 1:33 AM UTC

}// 135/140

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Waving surface #wavelet #d3 #wireframe

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rodrigo.siqueira

remix of d/17742 by u/rodrigo.siqueira

function u(t) {

x.fillRect(0,0,2e3,2e3)
for(i=-9;i<9;i=i+.004)ψ=C(7*(i+t*9))/(.1+i**4),x.clearRect((i*(.2+S(t))+9*t%9)*200,540-ψ*29*(1+S(t)/2),9,9)

Feb 26 2020 4:27 PM UTC

}// 131/140

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Continuous Morlet Wavelet transformations: translation and dilation of ψ for signal processing #wavelet

u/Cloud

Ohh, I dead

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rodrigo.siqueira

remix of d/17741 by u/rodrigo.siqueira

function u(t) {

for(X=-5;X<=5;X+=.01)
ψ=(1-X**2)*3**-(X**2/2)*S(t*8)+.5,
t<.8&&x.fillRect((X+5)*140+t*650,t*800+400-ψ*300,2,4)

Feb 25 2020 3:20 AM UTC

}// 110/140

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Marr Wavelet equation with parameter change over time. #d3 #wavelet

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rodrigo.siqueira

remix of d/17741 by u/rodrigo.siqueira

function u(t) {

x.globalAlpha=.1;x.fillRect(0,0,2e3,2e3)
for(X=-5;X<5;X=X+.01)
Y=(1-X**2)*2**-(X*X),
x.clearRect((X+5)*192,540-Y*460*C(t*5+S(X*9)/5)**9,5,5)

Feb 25 2020 3:09 AM UTC

}// 140/140

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Modulation on the frequency of Marr Wavelet (Mexican Hat Ricker Wavelet) #wavelet

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rodrigo.siqueira

function u(t) {

x.globalAlpha=.1;x.fillRect(0,0,2e3,2e3)
for(X=-5;X<5;X=X+.01)
ψ=(1-X**2)*2**-(X**2),
x.clearRect((X+5)*192,540-ψ*500*S(S(t*5)**9),5,5)

Feb 25 2020 2:32 AM UTC

}// 135/140

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Morlet wavelet (The Mexican hat), variation from the one in "Wavelet basics" tutorial. I'm starting to play with #wavelet

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marc8

function u(t) {

c.width=w=320
for(i=0;i<w;i++){
z=1-(S(k=(i-w/2)/11)/k)**2
x.globalAlpha=z**10 //gamma
x.lineTo(i,1+z*60)
x.fillRect(i,80,1,70)}
x.stroke()

Mar 12 2019 9:59 PM UTC

}// 139/140

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The physics dweets: single slit diffraction figure. Adjust the gamma value from 1 (accurate) to whatever (enhanced).

u/rodrigo.siqueira

Morlet Wavelet + Gabor filter #wavelet

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