Dweets by u/wclang

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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Current theme challenge: #Opposites

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wclang

function u(t) {

c.width=1920;x.font="300px arial";x.fillStyle="red";if(t/2-Math.floor(t/2)<0.5){x.fillText("No",100,300);}x.fillText("Vacancy",550,300);

Jan 1 2018 9:39 PM UTC

}// 136/140

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wclang

function u(t) {

function f(){return 1920*Math.random();} x.fillStyle=R(f()/3,f()/3,f()/3,.1);x.fillRect(f(),f(),f(),f());

Jan 1 2018 7:08 PM UTC

}// 105/140

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wclang

function u(t) {

c.width=1920;function v(a,b,h){x.fillRect(a,b,h,h);if(h>4){v(a+8*t,b+h,h/2);v(a-h,b+h,h/2);v(a+h,b-h,h/2);v(a-h/2,b-h,h/2);}}v(800,400,400);

Jan 1 2018 6:37 PM UTC

}// 140/140

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time-dependent recursion

u/Xen

Nice!
u/iverjo

#recursive

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wclang

function u(t) {

a=900;c.width=a;for(i=0;i<a;i=i+8){x.beginPath();x.arc(8*t,a/3,i,0,a);x.stroke();x.beginPath();x.moveTo(i,0);x.lineTo(i,a);x.stroke();}

Dec 31 2017 12:44 AM UTC

}// 135/140

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Moire patterns

u/quuxman

nice, remix d/4950

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wclang

function u(t) {

c.onmousemove=e=>X=e.clientX/2000
c.width=1920;
x.beginPath();
for(i=0;i<1000;i++){a=i*X+9*t;x.lineTo(800+i*C(a),500+i*S(a))}
x.stroke();

Dec 28 2017 9:55 PM UTC

}// 137/140

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Mouse over to change how tightly the Archimedean spiral is wound,.

u/wclang

(Another application of the mouse code I saw from FireFly, #1629.)

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wclang

function u(t) {

c.onmousemove=e=>X=e.clientX
a=20
for(i=0;i<80;i++){for(j=0;j<50;j++){z=(i*i+j*X+77*t)%255;x.fillStyle=R(z,0,0,1);x.fillRect(a*i,a*j,a,a)}}

Dec 28 2017 9:26 PM UTC

}// 140/140

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Move the mouse around to change the patterns

u/wclang

This borrows from Firefly #1629 again for capturing mouse movement, and combines my previous two dweets.
u/iverjo

#interactive

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wclang

function u(t) {

c.onmousemove=function(e){X=e.clientX;Y=e.clientY;}
x.clearRect(0,0,1920,1080);x.fillStyle="red";x.fillRect(3.3*X,3.3*Y,100,100);

Dec 28 2017 7:06 PM UTC

}// 129/140

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Mouse over the screen; a red square follows the mouse.

u/wclang

Note, you'll get an error message until you mouse over the screen.
u/wclang

There's a magic number, 3.3, that keeps the square under the mouse. This doesn't work in full-screen mode (the square is offset from the mouse).
u/wclang

I should mention I learned that mouse events are accessible from FireFly #1629. (I had to figure out what was going on in that dweet, so I could get X and Y off of the mouse.)
u/iverjo

#interactive

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wclang

function u(t) {

for(i=0;i<96;i++){for(j=0;j<54;j++){z=((i-48)*(i-48)-(j-27)*(j-27)+191*t)%255;x.fillStyle=R(z,0,256-z,1);x.fillRect(20*i,20*j,20,20)}}

Dec 28 2017 12:36 AM UTC

}// 134/140

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My first dweet!

u/lionleaf

Nice! Welcome, wclang
u/Xen

good work!

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