Hotodogo | Snippets: Aspect Radio Calculator

CSS Before Head

HTML Head

:root {
            --primary-color: #4CAF50;
            --secondary-color: #f8f9fa;
            --error-color: #dc3545;
            --text-color: #333;
            --border-radius: 10px;
            --box-shadow: 0 2px 15px rgba(0,0,0,0.1);
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        body {
            font-family: 'Segoe UI', sans-serif;
            background-color: #f5f5f5;
            color: var(--text-color);
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: flex-start;
            padding: 20px;
        }

        .container {
            background: white;
            padding: 25px;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            width: 100%;
            max-width: 800px;
            transition: all 0.3s ease;
        }

        .input-group {
            margin-bottom: 25px;
            padding: 20px;
            border-radius: var(--border-radius);
            background-color: rgba(248, 249, 250, 0.5);
            transition: all 0.3s ease;
        }

        h2 {
            margin-bottom: 20px;
            text-align: center;
            color: var(--primary-color);
        }

        h3 {
            margin-bottom: 15px;
            color: var(--primary-color);
            border-bottom: 1px solid #eee;
            padding-bottom: 10px;
        }

        label {
            display: block;
            margin-bottom: 8px;
            font-weight: 500;
        }

        input {
            width: 100%;
            padding: 12px;
            border: 1px solid #ddd;
            border-radius: 6px;
            margin-bottom: 15px;
            font-size: 16px;
            transition: border-color 0.3s ease;
        }

        input:focus {
            outline: none;
            border-color: var(--primary-color);
            box-shadow: 0 0 0 2px rgba(76, 175, 80, 0.2);
        }

        button {
            background-color: var(--primary-color);
            color: white;
            padding: 12px 25px;
            border: none;
            border-radius: 6px;
            cursor: pointer;
            font-size: 16px;
            font-weight: 500;
            margin: 10px 0;
            transition: all 0.3s ease;
            width: 100%;
        }

        button:hover {
            background-color: #45a049;
            transform: translateY(-2px);
            box-shadow: 0 4px 10px rgba(0,0,0,0.1);
        }

        button:active {
            transform: translateY(0);
        }

        .result {
            margin-top: 15px;
            padding: 15px;
            background-color: var(--secondary-color);
            border-radius: 6px;
            min-height: 60px;
            line-height: 1.6;
            font-size: 16px;
        }

        .error {
            color: var(--error-color);
            font-size: 14px;
            margin-top: 8px;
            min-height: 20px;
        }

        /* 响应式设计 */
        @media (min-width: 600px) {
            button {
                width: auto;
            }
        }

        @media (prefers-color-scheme: dark) {
            body {
                background-color: #202124;
                color: #e8eaed;
            }

            .container {
                background-color: #2d2e30;
                box-shadow: 0 2px 15px rgba(0,0,0,0.3);
            }

            .input-group {
                background-color: rgba(45, 46, 48, 0.7);
            }

            input {
                background-color: #3c4043;
                color: #e8eaed;
                border-color: #5f6368;
            }

            input:focus {
                border-color: var(--primary-color);
                box-shadow: 0 0 0 2px rgba(76, 175, 80, 0.3);
            }

            .result {
                background-color: #3c4043;
            }
        }

CSS After Head

JS Before HTML Body

<div class="container">
        <h2>长宽比计算器</h2>
        
        <div class="input-group">
            <h3>1. 计算初始长宽比</h3>
            <label>长度：</label>
            <input type="number" step="any" id="length" placeholder="请输入长度">
            <label>宽度：</label>
            <input type="number" step="any" id="width" placeholder="请输入宽度">
            <button onclick="calculateAspectRatio()">计算长宽比</button>
            <div class="result" id="aspectResult"></div>
            <div class="error" id="initialError"></div>
        </div>

        <div class="input-group">
            <h3>2. 根据长宽比计算新尺寸</h3>
            <label>新长度（留空则计算宽度）：</label>
            <input type="number" step="any" id="newLength" placeholder="可选输入新长度">
            <label>新宽度（留空则计算长度）：</label>
            <input type="number" step="any" id="newWidth" placeholder="可选输入新宽度">
            <button onclick="calculateNewDimension()">计算新尺寸</button>
            <div class="result" id="newDimensionResult"></div>
            <div class="error" id="newError"></div>
        </div>
    </div>

HTML Body

HTML Foot

let aspectRatio = null; // 存储计算得到的长宽比（[x, y]）

        // 计算最大公约数
        function gcd(a, b) {
            while (b !== 0) {
                let temp = b;
                b = a % b;
                a = temp;
            }
            return a;
        }

        // 计算长宽比
        function calculateAspectRatio() {
            const length = parseFloat(document.getElementById('length').value);
            const width = parseFloat(document.getElementById('width').value);
            const errorEl = document.getElementById('initialError');
            const resultEl = document.getElementById('aspectResult');

            // 输入验证
            if (isNaN(length) || isNaN(width)) {
                errorEl.textContent = "请输入有效的数字";
                resultEl.textContent = "";
                aspectRatio = null;
                return;
            }
            if (length <= 0 || width <= 0) {
                errorEl.textContent = "长度和宽度必须大于0";
                resultEl.textContent = "";
                aspectRatio = null;
                return;
            }

            errorEl.textContent = "";
            
            // 计算最简比值
            const divisor = gcd(length, width);
            const ratioX = (length / divisor).toFixed(2);
            const ratioY = (width / divisor).toFixed(2);
            
            // 处理浮点精度问题（例如16:9可能计算为16.00:9.00）
            const cleanX = ratioX.endsWith('.00') ? ratioX.split('.')[0] : ratioX;
            const cleanY = ratioY.endsWith('.00') ? ratioY.split('.')[0] : ratioY;
            
            aspectRatio = [length / width, cleanX, cleanY]; // 存储原始比例和简化后的比值
            resultEl.innerHTML = `长宽比为：${cleanX} : ${cleanY}<br>（原始比例：${length.toFixed(2)} : ${width.toFixed(2)}）`;
        }

        // 计算新尺寸
        function calculateNewDimension() {
            const newLength = parseFloat(document.getElementById('newLength').value);
            const newWidth = parseFloat(document.getElementById('newWidth').value);
            const errorEl = document.getElementById('newError');
            const resultEl = document.getElementById('newDimensionResult');

            // 验证基础条件
            if (!aspectRatio) {
                errorEl.textContent = "请先计算初始长宽比";
                resultEl.textContent = "";
                return;
            }
            if (isNaN(newLength) && isNaN(newWidth)) {
                errorEl.textContent = "请至少输入一个新长度或新宽度";
                resultEl.textContent = "";
                return;
            }
            if (!isNaN(newLength) && newLength <= 0 || !isNaN(newWidth) && newWidth <= 0) {
                errorEl.textContent = "输入的尺寸必须大于0";
                resultEl.textContent = "";
                return;
            }

            errorEl.textContent = "";
            const [ratio] = aspectRatio; // 原始比例（长/宽）

            let calculatedValue;
            if (!isNaN(newLength)) {
                // 已知新长度，计算宽度 = 长度 / 比例
                calculatedValue = newLength / ratio;
                resultEl.innerHTML = `当长度为 ${newLength.toFixed(2)} 时，<br>对应的宽度应为：${calculatedValue.toFixed(2)}<br>（长宽比保持 ${aspectRatio[1]} : ${aspectRatio[2]}）`;
            } else {
                // 已知新宽度，计算长度 = 宽度 * 比例
                calculatedValue = newWidth * ratio;
                resultEl.innerHTML = `当宽度为 ${newWidth.toFixed(2)} 时，<br>对应的长度应为：${calculatedValue.toFixed(2)}<br>（长宽比保持 ${aspectRatio[1]} : ${aspectRatio[2]}）`;
            }
        }

JS After HTML Body