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A UMD build of svg-path-bbox
此脚本不应直接安装。它是供其他脚本使用的外部库，要使用该库请加入元指令 // @require https://update.greasyfork.icu/scripts/525015/1527480/svg-path-bbox-umd.js
(function (global, factory) {
typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory(require('svgpath')) :
typeof define === 'function' && define.amd ? define(['svgpath'], factory) :
(global = typeof globalThis !== 'undefined' ? globalThis : global || self, global.svgPathBbox = factory(global.SvgPath));
})(this, (SvgPath => {
const CBEZIER_MINMAX_EPSILON = 0.00000001;
const minmaxQ = A => {
const min = Math.min(A[0], A[2]);
const max = Math.max(A[0], A[2]);
if (A[1] >= A[0] ? A[2] >= A[1] : A[2] <= A[1]) return [min, max];
const E = (A[0] * A[2] - A[1] * A[1]) / (A[0] - 2 * A[1] + A[2]);
return E < min ? [E, max] : [min, E];
};
const minmaxC = A => {
const K = A[0] - 3 * A[1] + 3 * A[2] - A[3];
if (Math.abs(K) < CBEZIER_MINMAX_EPSILON) {
if (A[0] === A[3] && A[0] === A[1]) return [A[0], A[3]];
return minmaxQ([
A[0],
-0.5 * A[0] + 1.5 * A[1],
A[0] - 3 * A[1] + 3 * A[2],
]);
}
const T = -A[0] * A[2] + A[0] * A[3] - A[1] * A[2] - A[1] * A[3] + A[1] * A[1] + A[2] * A[2];
if (T <= 0) return [Math.min(A[0], A[3]), Math.max(A[0], A[3])];
const S = Math.sqrt(T)
let min = Math.min(A[0], A[3]);
let max = Math.max(A[0], A[3]);
const L = A[0] - 2 * A[1] + A[2];
for (let R = (L + S) / K, i = 1; i <= 2; R = (L - S) / K, i++) {
if (R > 0 && R < 1) {
const Q = A[0] * (1 - R) * (1 - R) * (1 - R) + A[1] * 3 * (1 - R) * (1 - R) * R + A[2] * 3 * (1 - R) * R * R + A[3] * R * R * R;
if (Q < min) {
min = Q;
}
if (Q > max) {
max = Q;
}
}
}
return [min, max];
};
/**
* Compute bounding boxes of SVG paths.
* @param {String | typeof SvgPath} d SVG path for which their bounding box will be computed.
* @returns {BBox}
*/
const svgPathBbox = d => {
const min = [Infinity, Infinity];
const max = [-Infinity, -Infinity];
SvgPath.from(d)
.abs()
.unarc()
.unshort()
.iterate((seg, _, x, y) => {
switch (seg[0]) {
case "M": {
if (min[0] > seg[1]) {
min[0] = seg[1];
}
if (min[1] > seg[2]) {
min[1] = seg[2];
}
if (max[0] < seg[1]) {
max[0] = seg[1];
}
if (max[1] < seg[2]) {
max[1] = seg[2];
}
break;
}
case "H": {
if (min[0] > seg[1]) {
min[0] = seg[1];
}
if (max[0] < seg[1]) {
max[0] = seg[1];
}
break;
}
case "V": {
if (min[1] > seg[1]) {
min[1] = seg[1];
}
if (max[1] < seg[1]) {
max[1] = seg[1];
}
break;
}
case "L": {
if (min[0] > seg[1]) {
min[0] = seg[1];
}
if (min[1] > seg[2]) {
min[1] = seg[2];
}
if (max[0] < seg[1]) {
max[0] = seg[1];
}
if (max[1] < seg[2]) {
max[1] = seg[2];
}
break;
}
case "C": {
const cxMinMax = minmaxC([x, seg[1], seg[3], seg[5]]);
if (min[0] > cxMinMax[0]) {
min[0] = cxMinMax[0];
}
if (max[0] < cxMinMax[1]) {
max[0] = cxMinMax[1];
}
const cyMinMax = minmaxC([y, seg[2], seg[4], seg[6]]);
if (min[1] > cyMinMax[0]) {
min[1] = cyMinMax[0];
}
if (max[1] < cyMinMax[1]) {
max[1] = cyMinMax[1];
}
break;
}
case "Q": {
const qxMinMax = minmaxQ([x, seg[1], seg[3]]);
if (min[0] > qxMinMax[0]) {
min[0] = qxMinMax[0];
}
if (max[0] < qxMinMax[1]) {
max[0] = qxMinMax[1];
}
const qyMinMax = minmaxQ([y, seg[2], seg[4]]);
if (min[1] > qyMinMax[0]) {
min[1] = qyMinMax[0];
}
if (max[1] < qyMinMax[1]) {
max[1] = qyMinMax[1];
}
break;
}
}
}, true);
return [min[0], min[1], max[0], max[1]];
};
return svgPathBbox;
}));