Getting mouse position. Can someone mak… by ElisionFR

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

Please log in (or register) to post a dweet (copy-paste the code somewhere safe to save it meanwhile)


    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.

show FPS hide FPS share 1 remix fullscreen

ElisionFR

function u(t) {

c.width=c.clientWidth
c.height=c.clientHeight
c.a=c.a?c.a:[0,0]
c.onmousemove=e=>c.a=[e.pageX,e.pageY]
x.fillRect(c.a[0]-25,c.a[1]-25,50,50)

Feb 23 2020 12:42 PM UTC

}// 140/140

Please log in (or register) to post as a new dweet (copy-paste code somewhere safe to save it meanwhile).

Getting mouse position. Can someone make it in less characters ?

Show more comments…
u/tomxor

c.onmousemove=e=>{c.x=e.x,c.y=e.y};x.fillRect(c.x-25,c.y-25,50,50)
u/tomxor

Even smaller: c.onmousemove=e=>R=e x.fillRect(R.x-25,R.y-25,50,50) R can be any existing object of course
u/tomxor

Oh also can define global mousemove event rather than on c: onmousemove=e=>R=e;x.fillRect(R.x-25,R.y-25,50,50) pretty sure that's as far as it goes, -44 chars
u/tomxor

If you are happy without full screen you could also ommit the width/height and multiply by an appropriate constant: c.width|=onmousemove=e=>R=e;x.fillRect(R.x*3.4-25,R.y*3.4-25,50,50) that's -73, now you have some space to do something.
u/tomxor

hah, i did this before but forgot: https://www.dwitter.net/d/12717
u/tomxor

#mouse
u/ElisionFR

Nice ! Thanks !


      u(t) is called 60 times per second.
      t: elapsed time in seconds.
      c: A 1920x1080 canvas.
      x: A 2D context for that canvas.
      S: Math.sin
      C: Math.cos
      T: Math.tan
      R: Generates rgba-strings, ex.: R(255, 255, 255, 0.5)

dwitter.net