Speedcoding lib v2.1

speed.js

// Speedcoding library by @hamcha
// ver. 2.1
// Oval function by Deven Kalra

w=h=600;_w=window;_d=document;_fs=!w;
for(i in mf=Object.getOwnPropertyNames(Math))_w[mf[i]]=Math[mf[i]];
function clear(){$.ce(0,0,w,h)}
function clearp(a){$.fillStyle="rgba(255,255,255,"+a+")";$.fc(0,0,w,h);$.fillStyle="#000"}
function f(){$.fl()}
function s(){$.sr()}
function rect(x,y,w,h){$.ba();$.rc(x,y,w,h)}
function box(x,y,w,h){rect(x-w/2,y-h/2,w,h)}
function circle(x,y,r){$.ba();$.ac(x,y,r,0,PI*2)}
function oval(x,y,X,Y){$.sv();$.ba();$.ta(x-X,y-Y);$.sa(X,Y);$.ac(1,1,1,0,2*PI,0);$.rr()}
function poly(x,y,l,s,o){$.ba();$.mv(x+sin(o)*l,y+cos(o)*l);for(_i=s;_i--;)$.ln(x+sin(o+_i/s*PI*2)*l,y+cos(o+_i/s*PI*2)*l)}
function line(x,y,X,Y){$.ba();$.mv(x,y);$.ln(X,Y);s()}
function _f(a){return(a*256)|0}
function sw(s){$.lineWidth=s}
function scol(r,g,b,a){if(!a)a=1;$.strokeStyle="rgba("+[r,g,b].map(_f)+","+a+")"}
function fcol(r,g,b,a){if(!a)a=1;$.fillStyle="rgba("+[r,g,b].map(_f)+","+a+")"}
function font(t){$.font=t}
function ftxt(t,x,y){$.fx(t,x,y)}
function stxt(t,x,y){$.sx(t,x,y)}
function blend(m){$.globalCompositeOperation=m}
function _r(){requestAnimationFrame(_r);ms=new Date;t=ms/1e3;if(_w.render)render()}
function init(W,H){
  if((typeof W)[0]=="n")w=W,h=H
  else if(W===true)w=_w.innerWidth,h=_w.innerHeight,_fs=true
  _c=_d.createElement("canvas");_c.width=w;_c.height=h;
  if(!_fs)_c.style.border="1px solid #ccc",_c.style.margin="5px"
  else _w.onresize=function(){w=_w.innerWidth;h=_w.innerHeight;_c.width=w;_c.height=h}
  _d.body.appendChild(_c);$=_c.getContext("2d");for(Z in $)$[Z[0]+(Z[6]||Z[2])]=$[Z];_r()
}

Se alla fine di init() ci metti un "return $" imho è tutto di guadagnato: metti che vuoi usare qualche feature non compresa nella lib (es. il testo): basta fare $ = init(); $.fillText(blabla).

Non serve, $ è globale.