@antv/g2/lib/chart/layout/constraint/constraint.js

the Grammar of Graphics in Javascript

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.Constraint = void 0;
var tslib_1 = require("tslib");
var util_1 = require("@antv/util");
var gauss_1 = require("./gauss");
var variable_1 = require("./variable");
/**
 * 定义一个约束条件
 */
var Constraint = /** @class */ (function () {
    function Constraint(operator) {
        var elements = [];
        for (var _i = 1; _i < arguments.length; _i++) {
            elements[_i - 1] = arguments[_i];
        }
        this.operator = operator;
        this.elements = elements;
    }
    /**
     * 获得表达式中所有的变量
     */
    Constraint.prototype.getVariables = function () {
        var vars = [];
        // todo 去重
        for (var i = 0; i < this.elements.length; i++) {
            var element = this.elements[i];
            element = Array.isArray(element) ? element : [element];
            // @ts-ignore
            for (var j = 0; j < element.length; j++) {
                var el = element[j];
                if (variable_1.Variable.isVariable(el)) {
                    vars.push(el);
                }
            }
        }
        return vars;
    };
    /**
     * 获得方程组的高斯矩阵数组
     * 按照指定的 variable 顺序
     * @param variableMap 变量对应的 idx
     */
    Constraint.prototype.getGaussArr = function (variableMap) {
        var _this = this;
        var size = variableMap.size;
        // size 额外加上 b 常量
        var arr = new Array(size + 1).fill(0);
        this.elements.forEach(function (element) {
            var _a = tslib_1.__read(_this.parseElement(element), 2), a = _a[0], variable = _a[1];
            var idx = variableMap.get(variable);
            // 存在 -> 变量
            if ((0, util_1.isNumber)(idx)) {
                arr[idx] += a;
            }
            else {
                // 常数（最后一位）
                arr[size] += a;
            }
        });
        return arr;
    };
    /**
     * 解析 element，产生 [a, variable]
     * @param element
     */
    Constraint.prototype.parseElement = function (e) {
        if ((0, util_1.isNumber)(e)) {
            return [e, undefined];
        }
        if (variable_1.Variable.isVariable(e)) {
            return [1, e];
        }
        if (Array.isArray(e)) {
            var mul = (0, gauss_1.multiply)(e.filter(function (i) { return (0, util_1.isNumber)(i); }));
            var variable = e.find(function (i) { return variable_1.Variable.isVariable(i); });
            return [mul, variable];
        }
        // 其他非法情况
        return [0, undefined];
    };
    return Constraint;
}());
exports.Constraint = Constraint;
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