curve.min.js

/*	Curve extension for canvas 2.3.1
 *	Epistemex (c) 2013-2014
 *	License: MIT
 */
CanvasRenderingContext2D.prototype.curve=CanvasRenderingContext2D.prototype.curve||function(h,t,f,c){t=(typeof t==="number")?t:0.5;f=f?f:25;var j,d=1,e=h.length,n=0,m=(e-2)*f+2+(c?2*f:0),k=new Float32Array(m),a=new Float32Array((f+2)*4),b=4;j=h.slice(0);if(c){j.unshift(h[e-1]);j.unshift(h[e-2]);j.push(h[0],h[1])}else{j.unshift(h[1]);j.unshift(h[0]);j.push(h[e-2],h[e-1])}a[0]=1;for(;d<f;d++){var o=d/f,p=o*o,r=p*o,q=r*2,s=p*3;a[b++]=q-s+1;a[b++]=s-q;a[b++]=r-2*p+o;a[b++]=r-p}a[++b]=1;g(j,a,e);if(c){j=[];j.push(h[e-4],h[e-3],h[e-2],h[e-1]);j.push(h[0],h[1],h[2],h[3]);g(j,a,4)}function g(G,z,B){for(var A=2,H;A<B;A+=2){var C=G[A],D=G[A+1],E=G[A+2],F=G[A+3],I=(E-G[A-2])*t,J=(F-G[A-1])*t,K=(G[A+4]-C)*t,L=(G[A+5]-D)*t;for(H=0;H<f;H++){var u=H<<2,v=z[u],w=z[u+1],x=z[u+2],y=z[u+3];k[n++]=v*C+w*E+x*I+y*K;k[n++]=v*D+w*F+x*J+y*L}}}e=c?0:h.length-2;k[n++]=h[e];k[n]=h[e+1];for(d=0,e=k.length;d<e;d+=2){this.lineTo(k[d],k[d+1])}return k};