curve_func.min.js

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