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function u(t) {
} //
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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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ciaccodavide

function u(t) {

}//
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  • u/ciaccodavide
    left and right arrow to control the brush direction (if it gets out of bounds restart the dweet)
  • u/ciaccodavide
    try this version in a new dweet (acceleration control with up arrow, but I couldn't golf it enough): !t&&(d=[a=v=0],X=Y=99,onkeydown=e=>d[e.keyCode-37]=1,onkeyup=e=>d[e.keyCode-37]=0),x[f='fillRect'](X+=v*C(a+=(d[2]|-d[0])*.1),Y+=v*S(a),s=32,s,x[f](X+C(a)*s+8,Y+S(a)*s+8,9,9,v+=d[1]&v<6?2:v>0?-.1:0))
  • u/Joachim
    `t?onkeydown=e=>d[e.keyCode-37]=1:(d=[a=v=X=Y=0]),onkeyup=e=>d[e.keyCode-37]=0,x[f='fillRect'](X+=v*C(a+=(d[2]|-d[0])*.1),Y+=v*S(a),s=32,s),x[f](X+C(a)*s+8,Y+S(a)*s+8,9,9),v+=d[1]&v<6?2:v>0&&-.1

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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)