Dweets awesomed by u/eruonna

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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eruonna

remix of d/2511 by u/eruonna

function u(t) {

a=[0,-1,0,1,0]
if(t){if(i>=0){d=(p[i--]+1)%4;p.push(d);j++;b+=a[d];c-=a[d+1];x.lineTo(b,c);x.stroke()}else i=j}else{p=[0];i=j=0;b=380;c=830}

Apr 17 2017 9:30 PM UTC

}// 140/140

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denser version

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eruonna

remix of d/2509 by u/eruonna

function u(t) {

a=[0,-9,0,9,0]
if(t){if(i>=0){d=(p[i--]+1)%4;p.push(d);j++;b+=a[d];c-=a[d+1];x.lineTo(b,c);x.stroke()}else i=j}else{p=[0];i=j=0;b=380;c=830}

Apr 17 2017 9:29 PM UTC

}// 140/140

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adjusted position to get more on the screen

u/donbright

:)

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eruonna

function u(t) {

a=[0,9,0,-9,0]
if(t){if(i>=0){d=(p[i--]+1)%4;p.push(d);j++;b+=a[d];c-=a[d+1];x.lineTo(b,c);x.stroke()}else i=j}else{p=[0];i=j=0;b=960;c=540}

Apr 17 2017 8:56 PM UTC

}// 140/140

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Works best in full screen, otherwise line is too thin

u/donbright

how does it work ?
u/eruonna

One way to draw the next iteration of the dragon curve is to take the previous iteration and then add it to itself backwards and rotated 90 degrees. Here p is the array of previous steps, j the index of the current step, and i walks backward through p. When i gets to the beginning, we set it equal to j and start over.
u/donbright

thanks, that is fascinating

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eruonna

function u(t) {

c.width|=0
t?o.push({x:960,y:540,X:C(t*9),Y:S(t*9)}):o=[]
o.map(p=>{x.fillRect(p.x,p.y,9,9),p.x+=p.X,p.y+=p.Y})
o=o.length<999?o:[]

Apr 17 2017 8:33 PM UTC

}// 131/140

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u/donbright

great minds think alike https://www.dwitter.net/d/2159

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hscells

function u(t) {

c.width=1920
x.lineWidth=s=99
for(i=0;i<5;i++)x.beginPath(),x.arc(960,540,i*s,i,i-(S(t)+1)*Math.PI),x.stroke()

Apr 17 2017 10:51 AM UTC

}// 110/140

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eruonna

function u(t) {

for(g=[1440,60,1],c.width|=i=2;h=g[i];e=i--?b=540:333,f=t*.105/h,x.lineWidth=5,x.moveTo(960,b),x.lineTo(960+e*S(f),b-e*C(f)),x.stroke());

Apr 14 2017 10:47 PM UTC

}// 137/140

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A clock! I couldn't golf it enough to get varying line widths for the hands

u/joeytwiddle

Suggestion: c.width|=0;[1440,60,1].map((h,i)=>{e=300+100*i,f=t*.105/h,x.lineWidth=5,x.moveTo(960,540),x.lineTo(960+e*S(f),540-e*C(f)),x.stroke()})
u/eruonna

Oh yeah, that is nice
u/pangolin

I made a clock too! https://www.dwitter.net/d/2085

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NMcCoy

function u(t) {

w=c.width=1920
s=50
for(i=s;i<w;i+=s)
for(j=s;j<w/2;j+=s)
{
x.fillStyle=`hsl(${t*39+(j)*.3},99%,70%`
x.fillRect(i,j,S(t+i)*s,S(t+i)*s)
}

Apr 14 2017 10:16 PM UTC

}// 136/140

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eruonna

function u(t) {

c.width|=0;
x.lineWidth=3;
for(i=0;i<1.57;i+=.01){
  x[i?'lineTo':'moveTo'](960+540*C(17*(t+i)),540+540*S(19*(t+i)))
}
x.stroke()

Apr 14 2017 9:00 PM UTC

}// 129/140

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u/donbright

this boggles my mind

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eruonna

function u(t) {

for(c.width&=i=-9;i<9;i++,x.fillStyle=`hsl(${9*i},99%,50%`,x.beginPath(),r=i*40,x.arc(960+r*S(t/Math.abs(i)),540+r*C(t/i),20,0,6),x.fill());

Apr 14 2017 8:43 PM UTC

}// 140/140

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u/donbright

fascinating that they dont seem to overlap (ever?)

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New_Core

remix of d/506 by u/New_Core

function u(t) {

c.width=400;x.translate(200,114);x.rotate(t*.6);for(i=19;i--;)x.rotate(.3),x.fillText("DWITTER   ".split("")[0|i%10],0,50+30*C(t+i)+30)

Mar 25 2017 6:44 PM UTC

}// 135/140

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#text

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