105 lines
3 KiB
TypeScript
105 lines
3 KiB
TypeScript
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/*************************************************************
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*
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* Copyright (c) 2017-2022 The MathJax Consortium
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* @fileoverview Implements the CommonMroot wrapper mixin for the MmlMroot object
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*
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* @author dpvc@mathjax.org (Davide Cervone)
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*/
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import {Constructor} from '../../common/Wrapper.js';
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import {CommonMsqrt, MsqrtConstructor} from './msqrt.js';
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import {CommonMo} from './mo.js';
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import {BBox} from '../../../util/BBox.js';
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/*****************************************************************/
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/**
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* The CommonMroot interface
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*/
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export interface CommonMroot extends CommonMsqrt {
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}
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/**
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* Shorthand for the CommonMroot constructor
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*/
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export type MrootConstructor = Constructor<CommonMroot>;
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/*****************************************************************/
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/**
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* The CommonMroot wrapper mixin for the MmlMroot object (extends CommonMsqrt)
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*
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* @template T The Wrapper class constructor type
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*/
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export function CommonMrootMixin<T extends MsqrtConstructor>(Base: T): MrootConstructor & T {
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return class extends Base {
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/**
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* @override
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*/
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get surd() {
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return 2;
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}
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/**
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* @override
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*/
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get root(): number {
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return 1;
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}
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/**
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* @override
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*/
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public combineRootBBox(BBOX: BBox, sbox: BBox, H: number) {
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const bbox = this.childNodes[this.root].getOuterBBox();
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const h = this.getRootDimens(sbox, H)[1];
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BBOX.combine(bbox, 0, h);
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}
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/**
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* @override
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*/
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public getRootDimens(sbox: BBox, H: number) {
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const surd = this.childNodes[this.surd] as CommonMo;
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const bbox = this.childNodes[this.root].getOuterBBox();
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const offset = (surd.size < 0 ? .5 : .6) * sbox.w;
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const {w, rscale} = bbox;
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const W = Math.max(w, offset / rscale);
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const dx = Math.max(0, W - w);
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const h = this.rootHeight(bbox, sbox, surd.size, H);
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const x = W * rscale - offset;
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return [x, h, dx];
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}
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/**
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* @param {BBox} rbox The bbox of the root
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* @param {BBox} sbox The bbox of the surd
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* @param {number} size The size of the surd
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* @param {number} H The height of the root as a whole
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* @return {number} The height of the root within the surd
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*/
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public rootHeight(rbox: BBox, sbox: BBox, size: number, H: number): number {
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const h = sbox.h + sbox.d;
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const b = (size < 0 ? 1.9 : .55 * h) - (h - H);
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return b + Math.max(0, rbox.d * rbox.rscale);
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}
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};
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}
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