64 lines
1.9 KiB
JavaScript
64 lines
1.9 KiB
JavaScript
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import { min as v2Min, max as v2Max, scale as v2Scale, distance as v2Distance, add as v2Add, clone as v2Clone, sub as v2Sub } from '../../core/vector.js';
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export default function smoothBezier(points, smooth, isLoop, constraint) {
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var cps = [];
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var v = [];
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var v1 = [];
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var v2 = [];
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var prevPoint;
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var nextPoint;
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var min;
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var max;
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if (constraint) {
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min = [Infinity, Infinity];
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max = [-Infinity, -Infinity];
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for (var i = 0, len = points.length; i < len; i++) {
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v2Min(min, min, points[i]);
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v2Max(max, max, points[i]);
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}
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v2Min(min, min, constraint[0]);
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v2Max(max, max, constraint[1]);
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}
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for (var i = 0, len = points.length; i < len; i++) {
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var point = points[i];
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if (isLoop) {
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prevPoint = points[i ? i - 1 : len - 1];
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nextPoint = points[(i + 1) % len];
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}
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else {
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if (i === 0 || i === len - 1) {
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cps.push(v2Clone(points[i]));
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continue;
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}
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else {
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prevPoint = points[i - 1];
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nextPoint = points[i + 1];
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}
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}
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v2Sub(v, nextPoint, prevPoint);
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v2Scale(v, v, smooth);
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var d0 = v2Distance(point, prevPoint);
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var d1 = v2Distance(point, nextPoint);
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var sum = d0 + d1;
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if (sum !== 0) {
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d0 /= sum;
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d1 /= sum;
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}
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v2Scale(v1, v, -d0);
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v2Scale(v2, v, d1);
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var cp0 = v2Add([], point, v1);
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var cp1 = v2Add([], point, v2);
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if (constraint) {
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v2Max(cp0, cp0, min);
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v2Min(cp0, cp0, max);
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v2Max(cp1, cp1, min);
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v2Min(cp1, cp1, max);
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}
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cps.push(cp0);
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cps.push(cp1);
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}
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if (isLoop) {
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cps.push(cps.shift());
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}
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return cps;
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}
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