Dweets by u/robbyg

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: #Opposites

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robbyg

remix of d/15346 by u/robbyg

function u(t) {

P=Math.PI*2
for(y=12;y--;)x.fillStyle=R(0,h=y*20,h),x.fillRect(960+C(n=t/5+P/3*(y/4|0))*300+C(m=P/4*y+t)*200,540+S(n)*300+S(m)*200,4,4)

Aug 9 2019 6:24 PM UTC

}// 135/140

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Golfed and colorized for more visual interest.

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robbyg

function u(t) {

P=Math.PI*2
for(z=3;z--;)for(y=4;y--;)x.fillRect(960+C(n=P/3*z+t/5)*300+C(m=P/4*y+t)*200,540+S(n)*300+S(m)*200,4,4)

Aug 9 2019 1:00 PM UTC

}// 115/140

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Visualizing the paths of the cars on a ride at the local amusement park. 🎠

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robbyg

remix of d/15194 by u/robbyg

function u(t) {

for(i=2e3;i--;x.fillRect(X,Y,1,1))d=Math.random()*420,X=960+C(d+i)*d,Y=540+S(d+i)*d,x.fillStyle=`hsl(9,50%,${90-Math.hypot(760-X,400-Y)/7}%`

Jul 30 2019 9:47 PM UTC

}// 140/140

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More realistic shading.

u/robbyg

You can change the position of the "light" by changing the two numbers in Math.hypot(). Also, golfing tips welcome!
u/pavel

Some golf tricks in d/12574
u/aleamb

#shading #sphere
u/Cloud

Render in Blender)

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robbyg

function u(t) {

s=t*42
with(x)t<5?(beginPath(),arc(960-s,540-s,420-s*2,0,7),fillStyle=`hsl(99,50%,${15+s/3}%)`,fill()):0

Jul 29 2019 8:57 PM UTC

}// 104/140

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Ball?!

u/New_Core

=) in place of 0 in the end.. add : font="16cm'",fillText("❻",720,750)
u/katkip

^ kewl #sphere #lightness #light #d3

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robbyg

function u(t) {

s="3E71EAA0325D3E7C"
s.match(/.{2}/g).map((h,v)=>{z=parseInt(h,16);for(i=128,h=0;i>=1;i/=2,h++)z&i&&x.fillRect(h*99,v*99,99,99)})

Jul 23 2019 7:18 PM UTC

}// 129/140

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Converting a hexadecimal string into a sprite. Change the value of s to play!

u/robbyg

121: "3E71EAA0325D3E7C".match(/.{2}/g).map((s,v)=>{for(i=128,h=0;i>=1;i/=2,h++)parseInt(s,16)&i&&x.fillRect(h*99,v*99,99,99)})
u/robbyg

119 (okay I should do something else now): "3E71EAA0325D3E7C".match(/../g).map((s,v)=>{for(i=128,h=0;i>=1;i/=2,h++)parseInt(s,16)&i&&x.fillRect(h*99,v*99,99,99)})
u/robbyg

#pixelart

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robbyg

function u(t) {

c.width|=0
for(i=9;i--;)for(p=100;p--;)x.fillRect(560+i*100+p%5*10+S(t)*300,440+~~(p/5)*10+T(t/2-(i/4-p/800))*50,10,10)

Jul 23 2019 1:36 PM UTC

}// 119/140

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Can't seem to hold it together.

u/robbyg

#default

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robbyg

remix of d/15001 by u/Nosferatu

function u(t) {

c.width|=a=n=>x.fillRect(S(z=i*n*.002)*i/8+960,C(z)*i/8+540,5,5)
x.fillStyle=`hsl(${t*99},60%,40%)`
for(i=4e3;i--;)a(t+199),a(t+39),a(t+99)

Jul 18 2019 1:24 PM UTC

}// 139/140

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Golfed and colorized.

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robbyg

function u(t) {

c.width=192
x.arc(76,28,3,0,7)
x.arc(116,28,3,0,7)
x.fill()
x.fill(new Path2D(`M86 44 Q96 ${34-C(t)*10},106 44T106 64T86 64T86 44`))

Jun 27 2019 6:41 PM UTC

}// 133/140

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Comedy/Tragedy

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robbyg

function u(t) {

for(v=26,a=40,s=t%1,o=20*(1-s);v--;)for(h=48;h--;x.fillRect(o+h*a,o+v*a,a*s,a*s))x.fillStyle=['#fff','#000'][~~(t+h+v)%2]

Jun 10 2019 3:40 PM UTC

}// 121/140

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robbyg

function u(t) {

c=t?c+4:1;throw p=(t?p:0)+4/c-4/(c+2)

May 29 2019 5:22 PM UTC

}// 37/140

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Calculating #pi based on a formula I found in a Commodore 64 manual. Googling says it's the Gregory-Leibniz series.

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