wip: add node server

.gitignore

@@ -0,0 +1,3 @@
+/node_modules
+/uploads
+/examples/output

examples/api-example-multiple.js

@@ -0,0 +1,185 @@
+import fetch from 'node-fetch';
+import fs from 'fs/promises';
+import FormData from 'form-data';
+import path from 'path';
+import { fileURLToPath } from 'url';
+import { dirname } from 'path';
+
+/**
+ * SVGnest API 使用示例 - 多个SVG文件版本
+ * 这个版本分别上传容器和零件的SVG文件
+ */
+
+// 获取当前文件的目录路径
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = dirname(__filename);
+
+// 使用fetch调用API（在Node.js环境中）
+async function runNestingWithMultipleSvgFiles(binFilePath, partsFilePath, config = {}) {
+  try {
+    // 确保使用绝对路径
+    const absoluteBinPath = path.isAbsolute(binFilePath) ? binFilePath : path.resolve(__dirname, binFilePath);
+    const absolutePartsPath = path.isAbsolute(partsFilePath) ? partsFilePath : path.resolve(__dirname, partsFilePath);
+
+    console.log(`读取bin文件: ${absoluteBinPath}`);
+    console.log(`读取parts文件: ${absolutePartsPath}`);
+
+    // 读取SVG文件
+    const binFile = await fs.readFile(absoluteBinPath);
+    const partsFile = await fs.readFile(absolutePartsPath);
+
+    // 创建FormData
+    const formData = new FormData();
+    formData.append('binFile', binFile, {
+      filename: path.basename(absoluteBinPath),
+      contentType: 'image/svg+xml',
+    });
+    formData.append('partsFile', partsFile, {
+      filename: path.basename(absolutePartsPath),
+      contentType: 'image/svg+xml',
+    });
+
+    // 添加配置参数
+    if (config.spacing) formData.append('spacing', config.spacing.toString());
+    if (config.rotations) formData.append('rotations', config.rotations.toString());
+    if (config.populationSize) formData.append('populationSize', config.populationSize.toString());
+    if (config.mutationRate) formData.append('mutationRate', config.mutationRate.toString());
+    if (config.useHoles) formData.append('useHoles', config.useHoles.toString());
+    if (config.exploreConcave) formData.append('exploreConcave', config.exploreConcave.toString());
+
+    // 第一步：创建嵌套任务（上传SVG文件）
+    console.log('上传bin文件和parts文件...');
+    const createResponse = await fetch('http://localhost:3000/api/jobs/upload-multiple', {
+      method: 'POST',
+      body: formData,
+      headers: formData.getHeaders(),
+    });
+
+    const createResult = await createResponse.json();
+
+    if (!createResponse.ok) {
+      throw new Error(`创建任务失败: ${createResult.error || createResponse.statusText}`);
+    }
+
+    const { jobId } = createResult;
+    console.log(`创建任务成功，ID: ${jobId}`);
+    console.log(`容器ID: ${createResult.bin.id}`);
+    console.log(`零件数量: ${createResult.partsCount}`);
+
+    // 第二步：启动嵌套计算
+    console.log('启动嵌套计算...');
+    const startResponse = await fetch(`http://localhost:3000/api/jobs/${jobId}/start`, {
+      method: 'POST',
+      headers: {
+        'Content-Type': 'application/json',
+      },
+      body: JSON.stringify({
+        iterations: 20
+      })
+    });
+
+    if (!startResponse.ok) {
+      const startError = await startResponse.json();
+      throw new Error(`启动任务失败: ${startError.error || startResponse.statusText}`);
+    }
+
+    console.log(`已启动任务: ${jobId}`);
+
+    // 第三步：轮询任务状态
+    let status = 'processing';
+    while (status === 'processing') {
+      await new Promise(resolve => setTimeout(resolve, 1000)); // 等待1秒
+
+      const statusResponse = await fetch(`http://localhost:3000/api/jobs/${jobId}`);
+      const jobStatus = await statusResponse.json();
+
+      console.log(`任务进度: ${Math.round(jobStatus.progress * 100)}%`);
+      status = jobStatus.status;
+    }
+
+    // 第四步：获取结果
+    if (status === 'completed') {
+      const resultResponse = await fetch(`http://localhost:3000/api/jobs/${jobId}/result`);
+      const { result } = await resultResponse.json();
+
+      console.log('嵌套完成!');
+      console.log(`利用率: ${(result.utilization * 100).toFixed(2)}%`);
+      console.log('零件放置情况:');
+
+      // 添加空数组检查，避免forEach错误
+      if (result.placements && Array.isArray(result.placements)) {
+        result.placements.forEach(placement => {
+          console.log(`- 零件 ${placement.partId}: 位置 (${placement.x.toFixed(2)}, ${placement.y.toFixed(2)}), 旋转 ${placement.rotation}°`);
+        });
+
+        // 下载SVG文件
+        await downloadSVG(jobId);
+      } else {
+        console.log('没有返回零件放置信息');
+      }
+
+      // 显示未放置的零件
+      if (result.unplacedParts && result.unplacedParts.length > 0) {
+        console.log('未放置的零件:');
+        result.unplacedParts.forEach(part => {
+          console.log(`- 零件 ${part.id || part}`);
+        });
+      }
+
+      return result;
+    } else {
+      console.error(`任务失败，状态: ${status}`);
+      return null;
+    }
+  } catch (error) {
+    console.error('执行嵌套出错:', error);
+    throw error;
+  }
+}
+
+/**
+ * 从服务器下载SVG文件
+ * @param {string} jobId - 任务ID
+ */
+async function downloadSVG(jobId) {
+  try {
+    console.log('从服务器下载SVG文件...');
+
+    const svgResponse = await fetch(`http://localhost:3000/api/jobs/${jobId}/svg`);
+
+    if (!svgResponse.ok) {
+      throw new Error(`下载SVG失败: ${svgResponse.status} ${svgResponse.statusText}`);
+    }
+
+    const svgContent = await svgResponse.text();
+
+    // 保存到文件
+    const outputDir = path.resolve(__dirname, 'output');
+
+    // Ensure output directory exists
+    try {
+      await fs.access(outputDir);
+    } catch (err) {
+      await fs.mkdir(outputDir, { recursive: true });
+    }
+
+    const filename = path.join(outputDir, `nesting-result-${jobId}.svg`);
+    await fs.writeFile(filename, svgContent);
+    console.log(`SVG文件已下载并保存为: ${filename}`);
+  } catch (error) {
+    console.error('下载SVG出错:', error);
+  }
+}
+
+// 执行示例
+const binFilePath = process.argv[2] || './bin.svg';
+const partsFilePath = process.argv[3] || './parts.svg';
+
+console.log(`使用bin文件: ${binFilePath}`);
+console.log(`使用parts文件: ${partsFilePath}`);
+
+runNestingWithMultipleSvgFiles(binFilePath, partsFilePath, {
+  spacing: 5,
+  rotations: 4,
+  useHoles: true
+}).catch(console.error);

package.json

@@ -0,0 +1,28 @@
+{
+  "name": "svgnest-api",
+  "version": "1.0.0",
+  "description": "SVGnest API for optimal nesting of parts",
+  "main": "server.js",
+  "type": "module",
+  "scripts": {
+    "start": "node server.js",
+    "dev": "nodemon server.js",
+    "example-multiple": "node examples/api-example-multiple.js",
+    "init-examples": "node src/scripts/init-examples.js",
+    "validate-svg": "node src/scripts/validate-svg.js"
+  },
+  "dependencies": {
+    "body-parser": "^1.19.0",
+    "cors": "^2.8.5",
+    "express": "^4.17.1",
+    "form-data": "^4.0.0",
+    "js-clipper": "^1.0.1",
+    "multer": "^2.0.2",
+    "node-fetch": "^2.6.7",
+    "uuid": "^8.3.2",
+    "xmldom": "^0.6.0"
+  },
+  "devDependencies": {
+    "nodemon": "^2.0.14"
+  }
+}