3 lines
5.6 KiB
JavaScript
3 lines
5.6 KiB
JavaScript
// https://d3js.org/d3-contour/ v4.0.2 Copyright 2012-2023 Mike Bostock
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c=[[],[[[1,1.5],[.5,1]]],[[[1.5,1],[1,1.5]]],[[[1.5,1],[.5,1]]],[[[1,.5],[1.5,1]]],[[[1,1.5],[.5,1]],[[1,.5],[1.5,1]]],[[[1,.5],[1,1.5]]],[[[1,.5],[.5,1]]],[[[.5,1],[1,.5]]],[[[1,1.5],[1,.5]]],[[[.5,1],[1,.5]],[[1.5,1],[1,1.5]]],[[[1.5,1],[1,.5]]],[[[.5,1],[1.5,1]]],[[[1,1.5],[1.5,1]]],[[[.5,1],[1,1.5]]],[]];function h(){var r=1,u=1,a=n.thresholdSturges,h=w;function v(r){var t=a(r);if(Array.isArray(t))t=t.slice().sort(e);else{const e=n.extent(r,s);for(t=n.ticks(...n.nice(e[0],e[1],t),t);t[t.length-1]>=e[1];)t.pop();for(;t[1]<e[0];)t.shift()}return t.map((n=>p(r,n)))}function p(n,t){const e=null==t?NaN:+t;if(isNaN(e))throw new Error(`invalid value: ${t}`);var o=[],a=[];return function(n,t,e){var o,i,a,f,h,s,d=new Array,g=new Array;o=i=-1,f=l(n[0],t),c[f<<1].forEach(v);for(;++o<r-1;)a=f,f=l(n[o+1],t),c[a|f<<1].forEach(v);c[f<<0].forEach(v);for(;++i<u-1;){for(o=-1,f=l(n[i*r+r],t),h=l(n[i*r],t),c[f<<1|h<<2].forEach(v);++o<r-1;)a=f,f=l(n[i*r+r+o+1],t),s=h,h=l(n[i*r+o+1],t),c[a|f<<1|h<<2|s<<3].forEach(v);c[f|h<<3].forEach(v)}o=-1,h=n[i*r]>=t,c[h<<2].forEach(v);for(;++o<r-1;)s=h,h=l(n[i*r+o+1],t),c[h<<2|s<<3].forEach(v);function v(r){var n,t,u=[r[0][0]+o,r[0][1]+i],a=[r[1][0]+o,r[1][1]+i],f=y(u),c=y(a);(n=g[f])?(t=d[c])?(delete g[n.end],delete d[t.start],n===t?(n.ring.push(a),e(n.ring)):d[n.start]=g[t.end]={start:n.start,end:t.end,ring:n.ring.concat(t.ring)}):(delete g[n.end],n.ring.push(a),g[n.end=c]=n):(n=d[c])?(t=g[f])?(delete d[n.start],delete g[t.end],n===t?(n.ring.push(a),e(n.ring)):d[t.start]=g[n.end]={start:t.start,end:n.end,ring:t.ring.concat(n.ring)}):(delete 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Array.isArray(e)||(e=n.ticks(Number.MIN_VALUE,n.max(t)/o,e)),h().size([l,d]).thresholds(e.map((r=>r*o)))(t).map(((r,n)=>(r.value=+e[n],M(r))))}function M(r){return r.coordinates.forEach(A),r}function A(r){r.forEach(N)}function N(r){r.forEach(m)}function m(r){r[0]=r[0]*Math.pow(2,c)-s,r[1]=r[1]*Math.pow(2,c)-s}function b(){return l=u+2*(s=3*f)>>c,d=a+2*s>>c,E}return E.contours=function(r){var t=w(r),e=h().size([l,d]),o=Math.pow(2,2*c),i=r=>{r=+r;var n=M(e.contour(t,r*o));return n.value=r,n};return Object.defineProperty(i,"max",{get:()=>n.max(t)/o}),i},E.x=function(n){return arguments.length?(r="function"==typeof n?n:o(+n),E):r},E.y=function(r){return arguments.length?(e="function"==typeof r?r:o(+r),E):e},E.weight=function(r){return arguments.length?(i="function"==typeof r?r:o(+r),E):i},E.size=function(r){if(!arguments.length)return[u,a];var n=+r[0],t=+r[1];if(!(n>=0&&t>=0))throw new Error("invalid size");return u=n,a=t,b()},E.cellSize=function(r){if(!arguments.length)return 1<<c;if(!((r=+r)>=1))throw new Error("invalid cell size");return c=Math.floor(Math.log(r)/Math.LN2),b()},E.thresholds=function(r){return arguments.length?(g="function"==typeof r?r:Array.isArray(r)?o(t.call(r)):o(r),E):g},E.bandwidth=function(r){if(!arguments.length)return Math.sqrt(f*(f+1));if(!((r=+r)>=0))throw new Error("invalid bandwidth");return f=(Math.sqrt(4*r*r+1)-1)/2,b()},E},r.contours=h}));
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