用于计算两点之间等角螺线坐标的 JavaScript

方法 1：等角螺旋的基本 JavaScript 实现

该解决方案使用纯JavaScript，重点通过转换Julia示例来实现等角螺线计算。该方法基于使用基本数学函数来处理对数螺线。

// Function to calculate the hypotenuse of a triangle given two sides
function hypC(a, b) {
    return Math.sqrt(a * a + b * b);
}

// Initial points and variables for the spiral
let p1 = [1000, 1000], p2 = [0, 0];
let r = hypC(p2[0] - p1[0], p2[1] - p1[1]);
let theta_offset = Math.atan((p1[1] - p2[1]) / (p1[0] - p2[0]));
let rez = 1500, rev = 5;
let tRange = r, thetaRange = 2 * Math.PI * rev;

// Function to generate spiral points
function spiral() {
    for (let i = 1; i <= rez; i++) {
        let t = tRange * (i / rez);
        let theta = thetaRange * (i / rez);
        let x = Math.cos(theta) * r * Math.log(t) + p2[0];
        let y = Math.sin(theta) * r * Math.log(t) + p2[1];
        console.log(x, y);
    }
}

spiral();

方法 2：通过错误处理优化 JavaScript

该解决方案通过添加错误处理、输入验证和边缘情况管理来改进基本方法。它确保在对数计算中避免出现负值，并且螺旋生成更加稳健。

// Helper function to calculate distance between points
function hypotenuse(a, b) {
    return Math.sqrt(a * a + b * b);
}

// Initialize two points and related variables
let point1 = [1000, 1000], point2 = [0, 0];
let distance = hypotenuse(point2[0] - point1[0], point2[1] - point1[1]);
let thetaOffset = Math.atan2(point1[1] - point2[1], point1[0] - point2[0]);
let resolution = 1500, revolutions = 5;
let maxT = distance, maxTheta = 2 * Math.PI * revolutions;

// Validate t to prevent issues with logarithmic calculation
function validLog(t) {
    return t > 0 ? Math.log(t) : 0;
}

// Spiral generation with input validation
function generateSpiral() {
    for (let i = 1; i <= resolution; i++) {
        let t = maxT * (i / resolution);
        let theta = maxTheta * (i / resolution);
        let x = Math.cos(theta) * distance * validLog(t) + point2[0];
        let y = Math.sin(theta) * distance * validLog(t) + point2[1];
        console.log(x, y);
    }
}

generateSpiral();

方法 3：带有单元测试的模块化 JavaScript

这种方法侧重于创建模块化函数并添加单元测试来验证螺旋计算。每个功能都是分开的，以确保可重用性和可测试性。茉莉花用于测试。

// Module to calculate distance between two points
export function calculateDistance(x1, y1, x2, y2) {
    return Math.sqrt(Math.pow(x2 - x1, 2) + Math.pow(y2 - y1, 2));
}

// Module to calculate spiral coordinates
export function calculateSpiralCoords(point1, point2, resolution, revolutions) {
    let distance = calculateDistance(point1[0], point1[1], point2[0], point2[1]);
    let thetaOffset = Math.atan2(point1[1] - point2[1], point1[0] - point2[0]);
    let tRange = distance, thetaRange = 2 * Math.PI * revolutions;

    let coordinates = [];
    for (let i = 1; i <= resolution; i++) {
        let t = tRange * (i / resolution);
        let theta = thetaRange * (i / resolution);
        let x = Math.cos(theta) * distance * Math.log(t) + point2[0];
        let y = Math.sin(theta) * distance * Math.log(t) + point2[1];
        coordinates.push([x, y]);
    }
    return coordinates;
}

// Unit tests with Jasmine
describe('Spiral Module', () => {
    it('should calculate correct distance', () => {
        expect(calculateDistance(0, 0, 3, 4)).toEqual(5);
    });

    it('should generate valid spiral coordinates', () => {
        let coords = calculateSpiralCoords([1000, 1000], [0, 0], 1500, 5);
        expect(coords.length).toEqual(1500);
        expect(coords[0]).toBeDefined();
    });
});

1. 有关如何在 Julia 中计算等角螺线及其数学原理的详细信息，请参见 朱莉娅话语 。
2. 有关在 JavaScript 中实现数学函数（包括三角函数和对数函数）的其他参考，请参阅 MDN 网络文档 。
3. 极坐标的概念及其在编程中的实际应用在 Wolfram 数学世界 。