geometric-pack/dist/functions/quadratic-function/quadratic-function.js

Geometric pack with lots of available calculations for 2D and 3D geometry

"use strict";
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var __metadata = (this && this.__metadata) || function (k, v) {
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};
Object.defineProperty(exports, "__esModule", { value: true });
exports.QuadraticFunction = void 0;
var normalize_result_1 = require("../../utils/normalize-result");
var QuadraticFunction = /** @class */ (function () {
    function QuadraticFunction() {
        var args = [];
        for (var _i = 0; _i < arguments.length; _i++) {
            args[_i] = arguments[_i];
        }
        this.validateInput(args);
        this.a = args[0];
        this.b = args[1];
        this.c = args[2];
    }
    QuadraticFunction.prototype.validateInput = function (args) {
        args.forEach(function (arg) {
            if (typeof arg !== "number") {
                throw new Error("Argument must be a number");
            }
        });
        if (args.length !== 3) {
            throw new Error("QuadraticFunction constructor takes 3 arguments");
        }
        if (args[0] === 0) {
            throw new Error("Coefficient 'a' can't be equal 0");
        }
    };
    QuadraticFunction.prototype.getDefinition = function () {
        return {
            a: this.a,
            b: this.b,
            c: this.c,
            delta: this.getDelta(),
            solutions: this.getSolutions(),
            vertex: this.getVertex(),
            monotonicity: this.getMonotonicity(),
            positiveRange: this.getPositiveRange(),
            negativeRange: this.getNegativeRange(),
        };
    };
    QuadraticFunction.prototype.getDelta = function () {
        return Math.pow(this.b, 2) - 4 * this.a * this.c;
    };
    QuadraticFunction.prototype.getSolutions = function () {
        if (0 < this.getDelta()) {
            var x1 = (-this.b - Math.sqrt(this.getDelta())) / (2 * this.a);
            var x2 = (-this.b + Math.sqrt(this.getDelta())) / (2 * this.a);
            return [x1, x2].sort(function (a, b) { return a - b; });
        }
        if (0 === this.getDelta()) {
            var x = (-this.b - Math.sqrt(this.getDelta())) / (2 * this.a);
            return [x];
        }
        return [];
    };
    QuadraticFunction.prototype.getVertex = function () {
        var x = -this.b / (2 * this.a);
        var y = -this.getDelta() / (4 * this.a);
        return {
            x: x,
            y: y,
        };
    };
    QuadraticFunction.prototype.getMonotonicity = function () {
        var p = this.getVertex().x;
        var leftRange = [-Infinity, p];
        var rightRange = [p, Infinity];
        if (this.a > 0) {
            return {
                increasing: rightRange,
                decreasing: leftRange,
            };
        }
        return {
            increasing: leftRange,
            decreasing: rightRange,
        };
    };
    QuadraticFunction.prototype.getPositiveRange = function () {
        var solutions = this.getSolutions();
        var yCoordinate = this.getVertex().y;
        if (solutions.length === 2) {
            if (this.a > 0) {
                return [
                    [-Infinity, solutions[0]],
                    [solutions[1], Infinity],
                ];
            }
            return [[solutions[0], solutions[1]]];
        }
        if (solutions.length === 1) {
            if (this.a > 0) {
                return [
                    [-Infinity, solutions[0]],
                    [solutions[1], Infinity],
                ];
            }
            return [];
        }
        if (yCoordinate > 0) {
            return [[-Infinity, Infinity]];
        }
        return [];
    };
    QuadraticFunction.prototype.getNegativeRange = function () {
        var solutions = this.getSolutions();
        var yCoordinate = this.getVertex().y;
        if (solutions.length === 2) {
            if (this.a > 0) {
                return [[solutions[0], solutions[1]]];
            }
            return [
                [-Infinity, solutions[0]],
                [solutions[1], Infinity],
            ];
        }
        if (solutions.length === 1) {
            if (this.a > 0) {
                return [];
            }
            return [
                [-Infinity, solutions[0]],
                [solutions[1], Infinity],
            ];
        }
        if (yCoordinate > 0) {
            return [];
        }
        return [[-Infinity, Infinity]];
    };
    QuadraticFunction = __decorate([
        normalize_result_1.NormalizeResults(),
        __metadata("design:paramtypes", [Number])
    ], QuadraticFunction);
    return QuadraticFunction;
}());
exports.QuadraticFunction = QuadraticFunction;
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