素材图片在高分辨率屏幕上清晰显示；项目资源对话框点整行勾选

- 素材库每张图另外渲染一份两倍尺寸（name.2x.png），build-gallery.sh 把图片编号（原尺寸 PNG 的
  SHA-1，和运行器给图片的编号相同）和两倍图写进 index.json
- 网页认出素材图片（按编号或素材网址），图片框用 srcset、背景用 image-set，系统缩放 150%、200%
  的屏幕上不再发虚；学生程序读到的仍是原尺寸图片，宽高、评分都不变
- 素材清单 index.json 每次向服务器确认（不再缓存一小时），部署新素材后立即生效
- 项目资源对话框：点整行就能勾选（原来只能点复选框，"试听"不会勾选）；缩略图用灰色棋盘格底，
  透明背景上的白色图片（ico_title）也看得见

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

README.md

@@ -73,7 +73,7 @@ Docker Compose，HTTPS 由服务器上的 Nginx Proxy Manager 负责。推送到
 - 窗体设计器（仿 VS，界面中文）：工具箱、拖放与改大小、属性窗口、事件窗口、双击生成事件处理方法、撤销 / 重做；读写 VS 格式的 Designer.cs。
 - 多窗体：新建、删除窗体；运行时多个窗口可切换前后。
 - 部署：bubblewrap 沙箱（断网、只读、看不到其他进程，限制内存、CPU 时间和运行时长）、编译时禁止网络 / 反射 / 启动进程等 API、Docker Compose、GitHub Actions 自动部署。
-- 第 2 阶段（进行中）：账号登录（本机开发时老师账号为 admin / admin）、班级管理与 CSV 名单导入、学生作品保存在服务器上；自动评分（每个示例的 `checks.yaml`）；布置作业、学生提交后自动评分；老师评阅（看代码和界面截图、运行学生的程序、老师评分项打分、评语）、AI 评阅建议（DeepSeek，老师采纳后生效）、全班成绩表与 CSV 导出。
+- 第 2 阶段（进行中）：账号登录（本机开发时老师账号为 admin / admin）、班级管理与 CSV 名单导入、学生作品保存在服务器上；自动评分（每个示例的 `checks.yaml`）；实验页"评价项"可以自己检查（不计分）；布置作业、学生提交后自动评分；老师评阅（看代码和界面截图、运行学生的程序、老师评分项打分、评语）、AI 评阅建议（DeepSeek，老师采纳后生效）、全班成绩表与 CSV 导出。
 - 第 3 阶段（教材项目 4–8 已全部完成）：教材项目 5 用到的旧版线程 API（`Thread.Suspend` / `Resume` / `Abort`）编译时改写成平台的协作式实现（`runtime/Sim.Runner/LegacyThreadRewriter.cs`、`runtime/Sim.WinForms/Host/LegacyThreads.cs`）；网络摄像机（画面帧由 `runtime/Sim.Devices/Camera/build-frames.ts` 从 `scene.svg` 生成，需要 rsvg-convert 和 ImageMagick）。
 
 尚未完成：

docs/设计方案.md

@@ -315,6 +315,7 @@ flowchart TB
 
 - 2026-10-22：代码编辑器的语言功能：代码补全（输入 `btn_Open.` 列出按钮的属性、方法、事件，只列出平台仿真了的成员）、悬停提示、参数提示（`MessageBox.Show(` 列出重载，标出正在填的参数）、停止输入 1 秒后自动检查编译错误（提示和点"运行"时一样）。语言服务是一个常驻进程，每个浏览器标签页一份工程，只更新有变化的文件。实测（限制 2 核）：50 个标签页同时检查 1.2 秒内全部完成，同时补全 0.7 秒；内存约 260 MB。
 - 2026-10-22：AI 评阅：学生提交时浏览器给每个窗体截图；自动评分后由 DeepSeek Flash（支持图片输入和 JSON 输出）按书上评价表给老师评分项打建议分、写评语，发出的内容不含姓名学号，学生代码里像指令的文字一律当作品内容。提示词按教材的命名习惯校准（"缩写_含义"、书上规定的控件名、界面上不用的标签保留默认名都不扣分）：教材参考答案得 28/30，默认控件名、没有注释的作品得 15/30。评阅页显示截图和 AI 建议，可逐个采纳或"全部采纳"（不覆盖老师已评的分）；学生在老师评阅后又提交时提示老师重新看。一份作业约 0.02 元。
+- 2026-10-25：评价项和自测（为一个班试用做准备）：实验页工具栏"评价项"打开侧栏，列出这个实验（作业则是布置时的评分规则和各项分值）自动检查的功能项；"自己检查"在服务器上按评分规则运行学生现在的程序，逐项显示通过与否和不通过的原因。不计分、不留记录，自由练习和作业都能用；每人同时一次，结果在内存里保留到下一次，检查之后改过代码会提示结果可能过时；和提交评分共用全站的并发上限。评分时操作控件前最多等 3 秒让它出现（上一步刚打开的窗体在机器忙时晚一点显示）。
 
 ## 技术风险与待确认事项
 

runtime/Sim.WinForms/Resources/README.md

@@ -2,6 +2,6 @@
 
 学生在"项目资源"里添加的图片和声音（`Properties.Resources.xxx`），名字和尺寸与教材一致，全部由平台自绘或合成（不使用教材配套资料里的素材）。
 
-- `gallery/`：发布给运行器和网页的文件，`index.json` 是清单（名字、文件、中文说明、类型）。
+- `gallery/`：发布给运行器和网页的文件，`index.json` 是清单（名字、文件、中文说明、类型；图片还有编号 key 和两倍图 hidpi，由 `build-gallery.sh` 写入）。`name.png` 是原尺寸，学生程序读到的就是它；`name.2x.png` 只给高分辨率屏幕的浏览器显示用，宽高仍按原尺寸。
 - `svg/`：图片的源文件；`project8.py` 生成项目 8 的那些 SVG。改了以后运行 `python3 project8.py && sh build-gallery.sh` 重新生成 PNG（需要 rsvg-convert 和思源黑体）。
 - `gallery/ring.mp3`：用 ffmpeg 合成的门铃声（叮—咚），命令见提交记录。

runtime/Sim.WinForms/Resources/build-gallery.sh

@@ -1,6 +1,23 @@
 #!/bin/sh
-# 把 svg/ 下的素材渲染成 gallery/ 下的 PNG（尺寸取 SVG 自己的 width / height）。需要 rsvg-convert 和思源黑体等中文字体。
+# 把 svg/ 下的素材渲染成 gallery/ 下的 PNG：name.png 是原尺寸（学生程序读到的图片，宽高和教材一致），
+# name.2x.png 是两倍尺寸（只给高分辨率屏幕的浏览器显示用）。然后把每张图的编号（原尺寸 PNG 的 SHA-1，
+# 和运行器给图片的编号相同）和两倍图的文件名写进 gallery/index.json。需要 rsvg-convert 和思源黑体等中文字体。
 cd "$(dirname "$0")"
 for f in svg/*.svg; do
-  rsvg-convert "$f" -o "gallery/$(basename "$f" .svg).png"
+  name=$(basename "$f" .svg)
+  rsvg-convert "$f" -o "gallery/$name.png"
+  rsvg-convert -z 2 "$f" -o "gallery/$name.2x.png"
 done
+python3 - <<'PY'
+import hashlib, json, os
+items = json.load(open("gallery/index.json", encoding="utf-8"))
+for item in items:
+    if item["kind"] != "image":
+        continue
+    item["key"] = hashlib.sha1(open(f"gallery/{item['file']}", "rb").read()).hexdigest()
+    hidpi = item["file"].replace(".png", ".2x.png")
+    if os.path.exists(f"gallery/{hidpi}"):
+        item["hidpi"] = hidpi
+lines = ",\n".join("  " + json.dumps(i, ensure_ascii=False) for i in items)
+open("gallery/index.json", "w", encoding="utf-8").write(f"[\n{lines}\n]\n")
+PY

runtime/Sim.WinForms/Resources/gallery/index.json

@@ -1,27 +1,27 @@
 [
-  { "name": "switch_on", "file": "switch_on.png", "label": "开关：开", "kind": "image" },
-  { "name": "switch_off", "file": "switch_off.png", "label": "开关：关", "kind": "image" },
+  {"name": "switch_on", "file": "switch_on.png", "label": "开关：开", "kind": "image", "key": "6e660e1ff6fc2ff3167919bc386c300112bbce72", "hidpi": "switch_on.2x.png"},
+  {"name": "switch_off", "file": "switch_off.png", "label": "开关：关", "kind": "image", "key": "5d748b614084e878d6189d22f27813477cb8f4d9", "hidpi": "switch_off.2x.png"},
   {"name": "ring", "file": "ring.mp3", "label": "铃声", "kind": "audio"},
-  { "name": "ico_title", "file": "ico_title.png", "label": "标题：智慧校园", "kind": "image" },
-  { "name": "bg_home", "file": "bg_home.png", "label": "主界面背景：校园", "kind": "image" },
-  { "name": "icon_02", "file": "icon_02.png", "label": "图标：校园环境", "kind": "image" },
-  { "name": "icon_03", "file": "icon_03.png", "label": "图标：校园安防", "kind": "image" },
-  { "name": "icon_04", "file": "icon_04.png", "label": "图标：退出", "kind": "image" },
-  { "name": "day_01", "file": "day_01.png", "label": "路灯场景：亮灯", "kind": "image" },
-  { "name": "day_02", "file": "day_02.png", "label": "路灯场景：灭灯", "kind": "image" },
-  { "name": "bg_from1", "file": "bg_from1.png", "label": "面板背景（宽）", "kind": "image" },
-  { "name": "bg_from2", "file": "bg_from2.png", "label": "面板背景（窄）", "kind": "image" },
-  { "name": "icon_monitor", "file": "icon_monitor.png", "label": "监控：无画面", "kind": "image" },
-  { "name": "panel_video_ctrl", "file": "panel_video_ctrl.png", "label": "监控：方向盘底座", "kind": "image" },
-  { "name": "btn_arrow_up_normal", "file": "btn_arrow_up_normal.png", "label": "方向键：上", "kind": "image" },
-  { "name": "btn_arrow_up_press", "file": "btn_arrow_up_press.png", "label": "方向键：上（按下）", "kind": "image" },
-  { "name": "btn_arrow_down_normal", "file": "btn_arrow_down_normal.png", "label": "方向键：下", "kind": "image" },
-  { "name": "btn_arrow_down_press", "file": "btn_arrow_down_press.png", "label": "方向键：下（按下）", "kind": "image" },
-  { "name": "btn_arrow_left_normal", "file": "btn_arrow_left_normal.png", "label": "方向键：左", "kind": "image" },
-  { "name": "btn_arrow_left_press", "file": "btn_arrow_left_press.png", "label": "方向键：左（按下）", "kind": "image" },
-  { "name": "btn_arrow_right_normal", "file": "btn_arrow_right_normal.png", "label": "方向键：右", "kind": "image" },
-  { "name": "btn_arrow_right_press", "file": "btn_arrow_right_press.png", "label": "方向键：右（按下）", "kind": "image" },
-  { "name": "arrow_left_normal", "file": "arrow_left_normal.png", "label": "翻页：上一张", "kind": "image" },
-  { "name": "arrow_right_normal", "file": "arrow_right_normal.png", "label": "翻页：下一张", "kind": "image" },
-  { "name": "windowstate_closed_hover", "file": "windowstate_closed_hover.png", "label": "关闭按钮", "kind": "image" }
+  {"name": "ico_title", "file": "ico_title.png", "label": "标题：智慧校园", "kind": "image", "key": "8a4db5ad7bc26136ae48056d6e71fa077e36e80f", "hidpi": "ico_title.2x.png"},
+  {"name": "bg_home", "file": "bg_home.png", "label": "主界面背景：校园", "kind": "image", "key": "e56bcc13f7128dec305b6012b255d63fb0f94450", "hidpi": "bg_home.2x.png"},
+  {"name": "icon_02", "file": "icon_02.png", "label": "图标：校园环境", "kind": "image", "key": "fa6a1eaa87c87913803c77f928fa9c16b7f4bf6d", "hidpi": "icon_02.2x.png"},
+  {"name": "icon_03", "file": "icon_03.png", "label": "图标：校园安防", "kind": "image", "key": "d085064a505544968278a85233b7d9ac23661169", "hidpi": "icon_03.2x.png"},
+  {"name": "icon_04", "file": "icon_04.png", "label": "图标：退出", "kind": "image", "key": "c853d74ecab64a9ee85bdf24ccfa63e80123cce3", "hidpi": "icon_04.2x.png"},
+  {"name": "day_01", "file": "day_01.png", "label": "路灯场景：亮灯", "kind": "image", "key": "05065abdb4538906bd7c86e940ab5fb02d51469d", "hidpi": "day_01.2x.png"},
+  {"name": "day_02", "file": "day_02.png", "label": "路灯场景：灭灯", "kind": "image", "key": "470d523e90e188fe5c423d8cffeae6993d5528ff", "hidpi": "day_02.2x.png"},
+  {"name": "bg_from1", "file": "bg_from1.png", "label": "面板背景（宽）", "kind": "image", "key": "7a8c0a16fcab37b28a66e041024b25341cc69462", "hidpi": "bg_from1.2x.png"},
+  {"name": "bg_from2", "file": "bg_from2.png", "label": "面板背景（窄）", "kind": "image", "key": "52497df301d2b7e4eac0c297ce2316ef24863c47", "hidpi": "bg_from2.2x.png"},
+  {"name": "icon_monitor", "file": "icon_monitor.png", "label": "监控：无画面", "kind": "image", "key": "23e6f1efc0f382c17d8a091b76531a3b5879349d", "hidpi": "icon_monitor.2x.png"},
+  {"name": "panel_video_ctrl", "file": "panel_video_ctrl.png", "label": "监控：方向盘底座", "kind": "image", "key": "396443a1d8c141942c0f447e0c69786cf6ad3350", "hidpi": "panel_video_ctrl.2x.png"},
+  {"name": "btn_arrow_up_normal", "file": "btn_arrow_up_normal.png", "label": "方向键：上", "kind": "image", "key": "3c8b75ad465c8a61d0279facc233a0c64b62205a", "hidpi": "btn_arrow_up_normal.2x.png"},
+  {"name": "btn_arrow_up_press", "file": "btn_arrow_up_press.png", "label": "方向键：上（按下）", "kind": "image", "key": "51e1b9926d2bd611e3fda74a01231b46a930c460", "hidpi": "btn_arrow_up_press.2x.png"},
+  {"name": "btn_arrow_down_normal", "file": "btn_arrow_down_normal.png", "label": "方向键：下", "kind": "image", "key": "caf46f81c15aaca788462ebc47e58df299f097d9", "hidpi": "btn_arrow_down_normal.2x.png"},
+  {"name": "btn_arrow_down_press", "file": "btn_arrow_down_press.png", "label": "方向键：下（按下）", "kind": "image", "key": "88c1bea8d6fad99b14658d8265a88b04bc595006", "hidpi": "btn_arrow_down_press.2x.png"},
+  {"name": "btn_arrow_left_normal", "file": "btn_arrow_left_normal.png", "label": "方向键：左", "kind": "image", "key": "a38beb2373154d0474ad1715035aec5e2adf8c3f", "hidpi": "btn_arrow_left_normal.2x.png"},
+  {"name": "btn_arrow_left_press", "file": "btn_arrow_left_press.png", "label": "方向键：左（按下）", "kind": "image", "key": "47bd7a8ffc077130a8ceca627383a4647729c638", "hidpi": "btn_arrow_left_press.2x.png"},
+  {"name": "btn_arrow_right_normal", "file": "btn_arrow_right_normal.png", "label": "方向键：右", "kind": "image", "key": "e69e459f54d67e2c52128015bd6cfcf0e800a893", "hidpi": "btn_arrow_right_normal.2x.png"},
+  {"name": "btn_arrow_right_press", "file": "btn_arrow_right_press.png", "label": "方向键：右（按下）", "kind": "image", "key": "afb1f5fe5a14b7cef298a7d4c67c4cece9e01170", "hidpi": "btn_arrow_right_press.2x.png"},
+  {"name": "arrow_left_normal", "file": "arrow_left_normal.png", "label": "翻页：上一张", "kind": "image", "key": "5a9036955f791f0c41ba52afffb5ecc640d137f1", "hidpi": "arrow_left_normal.2x.png"},
+  {"name": "arrow_right_normal", "file": "arrow_right_normal.png", "label": "翻页：下一张", "kind": "image", "key": "62c53dfb3acf291ef07d6e52fcb989cd48c020b9", "hidpi": "arrow_right_normal.2x.png"},
+  {"name": "windowstate_closed_hover", "file": "windowstate_closed_hover.png", "label": "关闭按钮", "kind": "image", "key": "e361965dbd881dc21511208ce11f649517e8ddb6", "hidpi": "windowstate_closed_hover.2x.png"}
 ]

server/src/app.ts

@@ -6,6 +6,7 @@ import { bearerToken, login, logout, refresh, tokenUser, tooManyFailures, type T
 import { createClass, deleteClass, deleteStudent, importStudents, listClasses, listStudents, renameClass, resetPassword, type ImportRow } from './classes'
 import type { Scoring, StartMode } from '@iot/shared'
 import {
+  assignmentChecks,
   assignmentTemplate,
   classSubmissions,
   createAssignment,
@@ -18,6 +19,7 @@ import {
 } from './assignments'
 import { aiEnabled, getAiReview, type AiQueue } from './ai-review'
 import { parseChecks } from './grading/checks'
+import { createSelfCheck } from './grading/selfcheck'
 import { languageService } from './language-service'
 import { getReview, gradebook, manualScore, saveReview, studentDetail, submissionFiles } from './reviews'
 import type { GradingQueue } from './grading/queue'
@@ -78,7 +80,8 @@ export function createApp(db: Database, gradingQueue: GradingQueue, aiQueue: AiQ
     if (!/^[\w.-]+$/.test(name)) return c.notFound()
     const file = Bun.file(`${dirname(config.runnerDll)}/Resources/gallery/${name}`)
     if (!(await file.exists())) return c.notFound()
-    return new Response(file, { headers: { 'Cache-Control': 'public, max-age=3600' } })
+    // 清单随部署更新（新素材、图片编号），每次都向服务器确认；图片缓存一小时
+    return new Response(file, { headers: { 'Cache-Control': name === 'index.json' ? 'no-cache' : 'public, max-age=3600' } })
   })
 
   // 其余接口都要先登录（请求头 Authorization: Bearer <令牌>）
@@ -98,6 +101,30 @@ export function createApp(db: Database, gradingQueue: GradingQueue, aiQueue: AiQ
     return files ? c.json(files) : c.notFound()
   })
 
+  // ---- 自测：提交前自己跑一遍评分，不计分、不留记录 ----
+  const selfCheck = createSelfCheck()
+
+  /** 实验的评价项（自动检查的功能项名称）：实验页的评价项面板、老师布置作业时用 */
+  app.get('/api/samples/:id/checks', async (c) => {
+    const checks = await loadChecks(c.req.param('id'))
+    if (!checks) return c.json({ message: '这个实验还没有评分规则' }, 404)
+    return c.json(parseChecks(checks).map((check) => check.title))
+  })
+
+  app.post('/api/samples/:id/selfcheck', async (c) => {
+    const sampleId = c.req.param('id')
+    const yaml = (await listSamples()).some((s) => s.id === sampleId) ? await loadChecks(sampleId) : null
+    if (!yaml) return c.json({ message: '这个实验没有评价项' }, 404)
+    const { files } = await body<{ files: unknown }>(c)
+    if (!validFiles(files)) return c.json({ message: '作品格式不对或太大' }, 400)
+    if (!selfCheck.start(c.get('user').id, `sample:${sampleId}`, files, parseChecks(yaml), sampleId)) {
+      return c.json({ message: '上一次检查还没完成' }, 409)
+    }
+    return c.json(selfCheck.get(c.get('user').id))
+  })
+
+  app.get('/api/selfcheck', (c) => c.json(selfCheck.get(c.get('user').id)))
+
   // 代码编辑器的语言服务：补全、悬停提示、参数提示、边写边检查
   const LANGUAGE_REQUESTS = new Set(['complete', 'completionDetail', 'hover', 'signature', 'diagnostics'])
   app.post('/api/language', async (c) => {
@@ -197,6 +224,18 @@ export function createApp(db: Database, gradingQueue: GradingQueue, aiQueue: AiQ
     return c.json(latestSubmission(db, assignment.id, user.id))
   })
 
+  app.post('/api/assignments/:id/selfcheck', async (c) => {
+    const assignment = visibleAssignment(c)
+    const checks = assignment && assignmentChecks(db, assignment.id)
+    if (!assignment || !checks) return c.json({ message: '作业不存在' }, 404)
+    const { files } = await body<{ files: unknown }>(c)
+    if (!validFiles(files)) return c.json({ message: '作品格式不对或太大' }, 400)
+    if (!selfCheck.start(c.get('user').id, `assignment:${assignment.id}`, files, checks, assignment.sampleId)) {
+      return c.json({ message: '上一次检查还没完成' }, 409)
+    }
+    return c.json(selfCheck.get(c.get('user').id))
+  })
+
   app.get('/api/assignments/:id/submission', (c) => {
     const assignment = visibleAssignment(c)
     if (!assignment) return c.json({ message: '作业不存在' }, 404)
@@ -247,12 +286,6 @@ export function createApp(db: Database, gradingQueue: GradingQueue, aiQueue: AiQ
   })
 
   // 示例的自动评分项名称（布置作业时设置分值用）
-  app.get('/api/teacher/samples/:id/checks', async (c) => {
-    const checks = await loadChecks(c.req.param('id'))
-    if (!checks) return c.json({ message: '这个实验还没有评分规则' }, 404)
-    return c.json(parseChecks(checks).map((check) => check.title))
-  })
-
   // 班级的作业，带上提交人数
   app.get('/api/teacher/classes/:id/assignments', (c) =>
     c.json(

server/src/grading/queue.ts

@@ -1,6 +1,7 @@
 // 评分队列：学生提交后立即返回，后台按提交顺序评分（同时最多评 MAX_ACTIVE 份），结果写回数据库。
 // 服务器重启前没评完的提交，启动时继续评。评完调用 onGraded（接着做 AI 评阅）。
 import type { Database } from 'bun:sqlite'
+import type { SourceFile } from '@iot/shared'
 import { mkdir, rm } from 'node:fs/promises'
 import { dirname, join } from 'node:path'
 import { assignmentChecks, pendingSubmissionIds, saveGrade, submissionForGrading } from '../assignments'
@@ -10,6 +11,16 @@ import { grade } from './grader'
 
 const MAX_ACTIVE = 3
 
+/** 把作品写进一个干净的工程目录（评分和自测用） */
+export async function writeProject(dir: string, files: SourceFile[]) {
+  await rm(dir, { recursive: true, force: true })
+  for (const file of files) {
+    const target = safeJoin(dir, file.path)
+    await mkdir(dirname(target), { recursive: true })
+    await Bun.write(target, file.content)
+  }
+}
+
 export function createGradingQueue(db: Database, onGraded: (submissionId: number) => void = () => {}) {
   const queue: number[] = []
   let active = 0
@@ -21,12 +32,7 @@ export function createGradingQueue(db: Database, onGraded: (submissionId: number
     if (!submission || !checks) return
     const dir = join(config.runsDir, `grade-${id}`)
     try {
-      await rm(dir, { recursive: true, force: true })
-      for (const file of submission.files) {
-        const target = safeJoin(dir, file.path)
-        await mkdir(dirname(target), { recursive: true })
-        await Bun.write(target, file.content)
-      }
+      await writeProject(dir, submission.files)
       saveGrade(db, id, await grade(dir, checks, submission.sampleId))
       onGraded(id)
     } catch (error) {

server/src/grading/selfcheck.ts

@@ -0,0 +1,41 @@
+// 自测：学生提交前自己跑一遍评分，告诉他哪几项不通过、为什么；不计分、不留记录。
+// 每人同时只能有一次，结果放在内存里，保留到下一次自测（服务器重启后就没有了）。
+// 检查项和提交评分一样受全站并发上限（grader.ts 的 GRADE_CONCURRENCY）约束，机器忙时排队。
+import type { SelfCheck, SourceFile } from '@iot/shared'
+import { rm } from 'node:fs/promises'
+import { join } from 'node:path'
+import { config } from '../config'
+import type { Check } from './checks'
+import { grade } from './grader'
+import { writeProject } from './queue'
+
+export function createSelfCheck() {
+  const states = new Map<number, SelfCheck>()
+
+  return {
+    /** 开始自测；上一次还没完成时返回 false */
+    start(userId: number, target: string, files: SourceFile[], checks: Check[], sampleId: string): boolean {
+      if (states.get(userId)?.status === 'running') return false
+      const state: SelfCheck = { status: 'running', target, result: null, startedAt: Date.now() }
+      states.set(userId, state)
+      const dir = join(config.runsDir, `selfcheck-${userId}`)
+      void (async () => {
+        try {
+          await writeProject(dir, files)
+          state.result = await grade(dir, checks, sampleId)
+          state.status = 'done'
+        } catch (error) {
+          console.error(`自测出错（用户 ${userId}）：`, error)
+          state.status = 'error'
+        } finally {
+          await rm(dir, { recursive: true, force: true })
+        }
+      })()
+      return true
+    },
+
+    get(userId: number): SelfCheck | null {
+      return states.get(userId) ?? null
+    },
+  }
+}

server/test/api.test.ts

@@ -279,7 +279,7 @@ describe('作业', () => {
     })
     expect(result.status).toBe(400)
     expect(result.body.message).toBe('自动评分项应有 2 项')
-    expect((await t.get(`/api/teacher/samples/${encodeURIComponent(SAMPLE)}/checks`)).body).toEqual(['能正确打开报警灯', '能正确关闭报警灯'])
+    expect((await t.get(`/api/samples/${encodeURIComponent(SAMPLE)}/checks`)).body).toEqual(['能正确打开报警灯', '能正确关闭报警灯'])
   })
 
   test('学生能看到自己班的作业和起点工程，别的班看不到', async () => {
@@ -332,6 +332,32 @@ describe('作业', () => {
     expect((await student.get(`/api/assignments/${assignmentId}/submission`)).body.autoScore).toBe(30)
   }, 60000)
 
+  test('自测：提交前自己检查，告诉哪项不通过；不计分、不留记录，同时只能一次', async () => {
+    const { student, assignmentId, files } = await setup()
+    const finished = async () => {
+      for (let i = 0; i < 300; i++) {
+        const { body } = await student.get('/api/selfcheck')
+        if (body.status !== 'running') return body
+        await Bun.sleep(200)
+      }
+    }
+    const broken = files.map((f) => (f.path === 'Form1.cs' ? { ...f, content: f.content.replace('AlarmOnOff("Alarm", false);', '') } : f))
+    const started = await student.post(`/api/assignments/${assignmentId}/selfcheck`, { files: broken })
+    expect(started.body).toMatchObject({ status: 'running', target: `assignment:${assignmentId}` })
+    expect((await student.post(`/api/assignments/${assignmentId}/selfcheck`, { files })).status).toBe(409)
+    const result = await finished()
+    expect(result.result.results.map((r: any) => r.passed)).toEqual([true, false])
+    expect(result.result.results[1].message).toBeString()
+    // 自测不算提交
+    expect((await student.get(`/api/assignments/${assignmentId}/submission`)).body).toBeNull()
+
+    // 自由练习：按实验的评分规则检查
+    const sample = await student.post(`/api/samples/${encodeURIComponent(SAMPLE)}/selfcheck`, { files })
+    expect(sample.body.target).toBe(`sample:${SAMPLE}`)
+    expect((await finished()).result.results.map((r: any) => r.passed)).toEqual([true, true])
+    expect((await student.post('/api/samples/no-such/selfcheck', { files })).status).toBe(404)
+  }, 60000)
+
   test('过了截止时间不能提交', async () => {
     const { student, assignmentId, files } = await setup(Date.now() - 1000)
     const result = await student.post(`/api/assignments/${assignmentId}/submit`, { files })

shared/grading.ts

@@ -16,6 +16,15 @@ export interface GradeResult {
   ms: number
 }
 
+/** 自测（提交前自己跑一遍评分，不计分、不留记录）：每人同时一次，结果保留到下一次自测 */
+export interface SelfCheck {
+  status: 'running' | 'done' | 'error'
+  /** 检查的是哪个实验或作业（结果只对同一个显示） */
+  target: string
+  result: GradeResult | null
+  startedAt: number
+}
+
 // ---------- 作业 ----------
 
 /** 学生的起点：blank 空白工程（从界面做起），ui 界面已做好（只写代码） */

web/src/designer/FormDesigner.vue

@@ -2,7 +2,7 @@
 // 窗体设计器（仿 VS）：左边工具箱，中间窗体，下方组件栏，右边属性 / 事件窗口。
 // 窗体用运行时同一套 ControlView 渲染；上面盖一层透明的操作层，负责选中、拖动、改大小、放置新控件。
 // 每次改动都重新生成 Designer.cs，通过 update 事件交给页面保存。
-import { computed, ref, shallowRef, watch } from 'vue'
+import { computed, onBeforeUnmount, onMounted, ref, shallowRef, watch } from 'vue'
 import ControlView from '../winforms/ControlView.vue'
 import { displayText, fontCss, type FontValue } from '../winforms/format'
 import { CONTROLS, type ControlDef, FORM_DEF, controlDef, isContainerType } from './catalog'
@@ -164,6 +164,41 @@ const selectedAutoSize = computed(() => doc.value && selected.value && getPropTe
 
 // ---------- 指针操作：选中、移动、改大小 ----------
 const surface = ref<HTMLElement>()
+
+// ---------- 缩放：教材项目 8 的窗体有 1043×791，"适应"时按画布宽度缩小（不放大） ----------
+type ZoomChoice = 'fit' | '1' | '0.75' | '0.5'
+const ZOOM_KEY = 'iot-sim:designer-zoom'
+const ZOOM_OPTIONS: [ZoomChoice, string][] = [['fit', '适应宽度'], ['1', '100%'], ['0.75', '75%'], ['0.5', '50%']]
+const zoomChoice = ref<ZoomChoice>(readZoom())
+function readZoom(): ZoomChoice {
+  try {
+    const saved = localStorage.getItem(ZOOM_KEY)
+    return ZOOM_OPTIONS.some(([v]) => v === saved) ? (saved as ZoomChoice) : 'fit'
+  } catch {
+    return 'fit'
+  }
+}
+function setZoom(value: ZoomChoice) {
+  zoomChoice.value = value
+  try {
+    localStorage.setItem(ZOOM_KEY, value)
+  } catch {
+    // 浏览器不让存时只在这次有效
+  }
+}
+const canvas = ref<HTMLElement>()
+const canvasWidth = ref(0)
+const canvasObserver = new ResizeObserver(([entry]) => {
+  canvasWidth.value = entry.contentRect.width
+})
+onMounted(() => canvas.value && canvasObserver.observe(canvas.value))
+onBeforeUnmount(() => canvasObserver.disconnect())
+/** 窗体的缩放比例；鼠标位置除以它换算回窗体坐标 */
+const zoom = computed(() => {
+  if (zoomChoice.value !== 'fit') return Number(zoomChoice.value)
+  const width = clientSize.value.width + 2 + 8
+  return canvasWidth.value > 0 ? Math.max(0.3, Math.min(1, canvasWidth.value / width)) : 1
+})
 type Handle = 'n' | 's' | 'e' | 'w' | 'ne' | 'nw' | 'se' | 'sw'
 const HANDLES: Handle[] = ['nw', 'n', 'ne', 'e', 'se', 's', 'sw', 'w']
 
@@ -173,9 +208,9 @@ let drag:
   | { mode: 'form'; startX: number; startY: number; origin: { width: number; height: number } }
   | undefined
 
-function pointer(event: PointerEvent | DragEvent) {
+function pointer(event: PointerEvent | DragEvent | MouseEvent) {
   const box = surface.value!.getBoundingClientRect()
-  return { x: event.clientX - box.left, y: event.clientY - box.top }
+  return { x: (event.clientX - box.left) / zoom.value, y: (event.clientY - box.top) / zoom.value }
 }
 
 function onPointerDown(event: PointerEvent) {
@@ -286,8 +321,9 @@ function onKeyDown(event: KeyboardEvent) {
 // ---------- 工具箱 ----------
 const TOOLBOX_GROUPS = ['常用控件', '容器', '数据', '组件', '物联网设备'] as const
 const ICONS: Record<string, string> = {
-  按钮: '▭', 标签: 'A', 文本框: '▤', 下拉框: '☰', 复选框: '☑', 单选按钮: '◉', 分组框: '⬚', 面板: '▢',
-  定时器: '⏱', 'LED 显示屏': '▬', 灯泡: '💡', 报警灯: '🚨',
+  按钮: '▭', 标签: 'A', 文本框: '▤', 下拉框: '☰', 列表框: '≣', 图片框: '🖼', 日期时间选择器: '📅', 滑动条: '⊶',
+  复选框: '☑', 单选按钮: '◉', 分组框: '⬚', 面板: '▢', 数据表格: '▦', 图表: '📈',
+  定时器: '⏱', 媒体播放器: '🔊', 'LED 显示屏': '▬', 灯泡: '💡', 报警灯: '🚨',
 }
 const DRAG_TYPE = 'application/x-winforms-control'
 
@@ -391,8 +427,8 @@ function clearEvent(target: string, eventName: string) {
 function onDoubleClick(event: MouseEvent) {
   const d = parsed.value.doc
   if (!d) return
-  const box = surface.value!.getBoundingClientRect()
-  const hit = hitTest(d, event.clientX - box.left, event.clientY - box.top) ?? ''
+  const { x, y } = pointer(event)
+  const hit = hitTest(d, x, y) ?? ''
   const def = hit ? controlDef(typeOf(d, hit) ?? '') : FORM_DEF
   openEvent(hit, def.defaultEvent)
 }
@@ -440,16 +476,26 @@ const noop = () => {}
       </template>
     </aside>
 
-    <section class="canvas">
+    <section ref="canvas" class="canvas">
       <div class="actions">
         <button :disabled="!canUndo" title="撤销（Ctrl+Z）" @click="emit('undo')">↶ 撤销</button>
         <button :disabled="!canRedo" title="重做（Ctrl+Y）" @click="emit('redo')">↷ 重做</button>
         <span class="tips">拖动工具箱里的控件到窗体上；双击控件生成事件处理方法；Delete 删除</span>
+        <select
+          class="zoom"
+          title="窗体显示的大小（不影响窗体的实际大小）"
+          :value="zoomChoice"
+          @change="setZoom(($event.target as HTMLSelectElement).value as ZoomChoice)"
+        >
+          <option v-for="[value, label] in ZOOM_OPTIONS" :key="value" :value="value">
+            {{ value === 'fit' ? `${label}（${Math.round(zoom * 100)}%）` : label }}
+          </option>
+        </select>
         <button class="view-code" title="设计器根据窗体上的控件自动生成的代码（Designer.cs）" @click="emit('openDesignerFile')">
           查看生成的代码
         </button>
       </div>
-      <div class="window" :class="{ selected: selected === '' }">
+      <div class="window" :class="{ selected: selected === '' }" :style="zoom !== 1 ? { zoom } : undefined">
         <div class="titlebar" @pointerdown="selected = ''">
           <span class="title">{{ displayText(formTitle) }}</span>
           <span class="buttons">─ ☐ ✕</span>
@@ -601,8 +647,17 @@ const noop = () => {}
   cursor: default;
 }
 
-.view-code {
+.zoom {
   margin-left: auto;
+  padding: 1px 4px;
+  border: 1px solid #c5ccd5;
+  border-radius: 3px;
+  background: #fff;
+  font: inherit;
+}
+
+.view-code {
+  flex: none;
 }
 
 .tips {

web/src/designer/ResourcesDialog.vue

@@ -45,13 +45,20 @@ function save() {
   <NModal :show="show" preset="card" title="项目资源" style="width: 560px; max-width: calc(100vw - 32px)" @update:show="emit('update:show', $event)">
     <p class="note">勾选要加入项目的图片和声音（平台素材库，名字和教材一致）。代码里写 <code>Properties.Resources.名字</code>，图片框的"图片"属性也可以直接选。</p>
     <div class="items">
-      <label v-for="item in gallery" :key="item.name" class="item" :class="{ on: chosen.has(item.name) }">
-        <NCheckbox :checked="chosen.has(item.name)" @update:checked="toggle(item.name, $event)" />
-        <img v-if="item.kind === 'image'" :src="`/resources/${item.file}`" alt="" class="thumb" />
-        <NButton v-else size="tiny" class="audio" @click.prevent="listen(item.file)">▶ 试听</NButton>
+      <!-- 点整行都能勾选；复选框和"试听"自己处理点击，不再传给这一行 -->
+      <div v-for="item in gallery" :key="item.name" class="item" :class="{ on: chosen.has(item.name) }" @click="toggle(item.name, !chosen.has(item.name))">
+        <NCheckbox :checked="chosen.has(item.name)" @click.stop @update:checked="toggle(item.name, $event)" />
+        <img
+          v-if="item.kind === 'image'"
+          :src="`/resources/${item.file}`"
+          :srcset="item.hidpi ? `/resources/${item.file} 1x, /resources/${item.hidpi} 2x` : undefined"
+          alt=""
+          class="thumb"
+        />
+        <NButton v-else size="tiny" class="audio" @click.stop="listen(item.file)">▶ 试听</NButton>
         <span class="name">{{ item.name }}</span>
         <span class="label">{{ item.label }}</span>
-      </label>
+      </div>
       <div v-if="gallery.length === 0" class="note">正在加载素材库…</div>
     </div>
     <template #footer>
@@ -106,6 +113,11 @@ function save() {
   max-height: 40px;
 }
 
+/* 灰色棋盘格底：透明背景上的白色图片（如 ico_title 的白字）也看得见 */
+.thumb {
+  background: repeating-conic-gradient(#9ca3af 0 25%, #c4c9d0 0 50%) 0 0 / 10px 10px;
+}
+
 .audio {
   justify-self: start;
 }

web/src/designer/resources.ts

@@ -11,6 +11,10 @@ export interface GalleryItem {
   /** 中文说明 */
   label: string
   kind: 'image' | 'audio'
+  /** 图片的编号（原尺寸 PNG 的 SHA-1，和运行器给图片的编号相同） */
+  key?: string
+  /** 两倍尺寸的图片文件，高分辨率屏幕上显示用 */
+  hidpi?: string
 }
 
 export const RESOURCES_FILE = 'Properties/Resources.Designer.cs'

web/src/grading/SelfCheckPanel.vue

@@ -0,0 +1,179 @@
+<script setup lang="ts">
+// 评价项面板：列出这个实验（或作业）自动检查的功能项；"自己检查"在服务器上运行学生现在的程序逐项检查，
+// 告诉他哪几项不通过、为什么。不计分、不留记录，提交作业另算。
+import { NButton, NDrawer, NDrawerContent, NSpin } from 'naive-ui'
+import { computed, onBeforeUnmount, ref, watch } from 'vue'
+import type { SelfCheck, SourceFile } from '@iot/shared'
+import { api } from '../api'
+
+const props = defineProps<{
+  show: boolean
+  /** 检查项名称 */
+  titles: string[]
+  /** sample:实验编号 或 assignment:作业编号，和服务器返回的 target 对应 */
+  target: string
+  /** 开始检查的接口（/api/samples/:id/selfcheck 或 /api/assignments/:id/selfcheck） */
+  url: string
+  /** 学生现在的代码 */
+  files: SourceFile[]
+  /** 开始检查前调用（先把没保存的改动存好） */
+  beforeStart?: () => Promise<void>
+  /** 作业的各项分值（自由练习没有） */
+  points?: number[]
+}>()
+const emit = defineEmits<{ 'update:show': [show: boolean] }>()
+
+const state = ref<SelfCheck | null>(null)
+const error = ref('')
+/** 开始检查时的代码；之后改过代码就提示结果可能过时（刷新页面后不知道，不提示） */
+const checkedFiles = ref<string>()
+const current = computed(() => (state.value?.target === props.target ? state.value : null))
+const running = computed(() => current.value?.status === 'running')
+const outdated = computed(() => checkedFiles.value !== undefined && current.value?.status === 'done' && checkedFiles.value !== JSON.stringify(props.files))
+const passed = computed(() => current.value?.result?.results.filter((r) => r.passed).length ?? 0)
+
+let timer: ReturnType<typeof setTimeout> | undefined
+async function refresh() {
+  clearTimeout(timer)
+  state.value = await api<SelfCheck | null>('GET', '/api/selfcheck').catch(() => state.value)
+  if (state.value?.status === 'running') timer = setTimeout(refresh, 2000)
+}
+onBeforeUnmount(() => clearTimeout(timer))
+
+watch(
+  () => props.show,
+  (show) => {
+    if (show) void refresh()
+  },
+  { immediate: true },
+)
+
+async function start() {
+  error.value = ''
+  try {
+    await props.beforeStart?.()
+    checkedFiles.value = JSON.stringify(props.files)
+    state.value = await api<SelfCheck>('POST', props.url, { files: props.files })
+    timer = setTimeout(refresh, 2000)
+  } catch (e) {
+    error.value = (e as Error).message
+  }
+}
+
+const formatTime = (ms: number) => new Date(ms).toLocaleTimeString('zh-CN', { hour: '2-digit', minute: '2-digit' })
+</script>
+
+<template>
+  <NDrawer :show="show" :width="420" placement="right" @update:show="emit('update:show', $event)">
+    <NDrawerContent title="评价项" closable>
+      <p class="note">
+        下面这些功能项由平台自动检查。点"自己检查"，平台会运行你现在的程序，逐项操作、核对结果，
+        告诉你哪几项还没做好。<b>不计分、不留记录</b>，可以随时检查。
+      </p>
+      <div class="actions">
+        <NButton type="primary" :loading="running" :disabled="running || titles.length === 0" @click="start">自己检查</NButton>
+        <span v-if="running" class="status"><NSpin size="small" /> 正在检查，每项都要启动一次程序，请稍等…</span>
+        <span v-else-if="current?.status === 'done' && current.result" class="status">
+          {{ formatTime(current.startedAt) }} 检查：通过 <b>{{ passed }}</b> / {{ current.result.results.length }} 项
+        </span>
+        <span v-else-if="current?.status === 'error'" class="status error">检查时服务器出错了，请再试一次</span>
+      </div>
+      <div v-if="error" class="error">{{ error }}</div>
+      <div v-if="outdated" class="outdated">检查之后代码改过了，结果可能已经过时</div>
+      <div v-if="current?.result && !current.result.compiled" class="error">编译没有通过，先改正编译错误</div>
+
+      <ul class="items">
+        <li
+          v-for="(title, i) in titles"
+          :key="i"
+          :class="current?.result && !running ? (current.result.results[i]?.passed ? 'passed' : 'failed') : ''"
+        >
+          <span class="mark">{{ current?.result && !running ? (current.result.results[i]?.passed ? '✓' : '✗') : '·' }}</span>
+          <div>
+            <div class="title">
+              {{ title }}<span v-if="points" class="points">{{ points[i] }} 分</span>
+            </div>
+            <div v-if="current?.result && !running && current.result.results[i]?.message" class="message">
+              {{ current.result.results[i].message }}
+            </div>
+          </div>
+        </li>
+      </ul>
+    </NDrawerContent>
+  </NDrawer>
+</template>
+
+<style scoped>
+.note {
+  margin: 0 0 12px;
+  font-size: 13px;
+  color: #4b5563;
+  line-height: 1.6;
+}
+
+.actions {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+  margin-bottom: 8px;
+}
+
+.status {
+  display: flex;
+  align-items: center;
+  gap: 6px;
+  font-size: 13px;
+  color: #374151;
+}
+
+.error {
+  color: #b91c1c;
+  font-size: 13px;
+}
+
+.outdated {
+  margin: 4px 0;
+  color: #a16207;
+  font-size: 13px;
+}
+
+.items {
+  margin: 12px 0 0;
+  padding: 0;
+  list-style: none;
+  display: flex;
+  flex-direction: column;
+  gap: 8px;
+  font-size: 13px;
+}
+
+.items li {
+  display: flex;
+  gap: 8px;
+}
+
+.mark {
+  width: 1em;
+  flex: none;
+  font-weight: bold;
+  color: #9ca3af;
+}
+
+.passed .mark {
+  color: #16a34a;
+}
+
+.failed .mark {
+  color: #dc2626;
+}
+
+.points {
+  margin-left: 8px;
+  color: #6b7280;
+}
+
+.message {
+  margin-top: 2px;
+  color: #b91c1c;
+}
+</style>

web/src/pages/DatabasePage.vue

@@ -200,7 +200,7 @@ onMounted(refresh)
         <div v-else class="empty">
           <p>右键左边的"数据库"新建数据库；右键表可以编辑数据、设计表结构。</p>
           <p>也可以点"新建查询"，用 SQL 语句建库、建表、增删改查。</p>
-          <p>做教材项目 6 的任务 2、3 前，可以点"恢复实验初始数据"准备好"环境数据表"库。</p>
+          <p>运行要用数据库的实验（教材项目 6 的任务 2、3，项目 8）时，平台会自动建好需要的库；把实验库恢复成初始数据，点"恢复实验初始数据"。</p>
         </div>
       </main>
     </div>

web/src/pages/WorkbenchPage.vue

@@ -18,6 +18,7 @@ import { deleteWork, loadWork, sampleWorkKey, saveWork } from '../editor/works'
 import RunArea from '../run/RunArea.vue'
 import { createRunSession } from '../run/session'
 import GradeResultView from '../grading/GradeResultView.vue'
+import SelfCheckPanel from '../grading/SelfCheckPanel.vue'
 import { captureForms } from '../grading/screenshots'
 
 const props = defineProps<{ assignmentId?: string; submissionId?: string }>()
@@ -134,9 +135,28 @@ async function openProject(key: string, original: () => Promise<SourceFile[]>, d
 async function loadSample(id: string, discardWork = false) {
   sampleId.value = id
   void router.replace({ query: { sample: id } })
+  sampleChecks.value = []
+  void api<string[]>('GET', `/api/samples/${encodeURIComponent(id)}/checks`)
+    .then((titles) => {
+      if (sampleId.value === id) sampleChecks.value = titles
+    })
+    .catch(() => {})
   await openProject(sampleWorkKey(id), () => api<SourceFile[]>('GET', `/api/samples/${encodeURIComponent(id)}`), discardWork)
 }
 
+// ---------- 评价项和自测 ----------
+const sampleChecks = ref<string[]>([])
+const selfCheckOpen = ref(false)
+/** 作业用布置时的评分规则，自由练习用实验的评分规则 */
+const selfCheck = computed(() => {
+  if (props.assignmentId) {
+    const a = assignment.value
+    return a ? { titles: a.checkTitles, target: `assignment:${a.id}`, url: `/api/assignments/${a.id}/selfcheck`, points: a.scoring.auto } : null
+  }
+  const id = sampleId.value
+  return id && sampleChecks.value.length ? { titles: sampleChecks.value, target: `sample:${id}`, url: `/api/samples/${encodeURIComponent(id)}/selfcheck` } : null
+})
+
 // ---------- 作业 ----------
 const assignment = ref<Assignment | null>(null)
 const submission = ref<Submission | null>(null)
@@ -407,8 +427,28 @@ function restoreOriginal() {
   else if (sampleId.value) void loadSample(sampleId.value, true)
 }
 
+// ---------- 收起运行区（设计大窗体、写代码时左栏占满宽度；运行程序时自动展开） ----------
+const RUN_COLLAPSED_KEY = 'iot-sim:run-collapsed'
+const runCollapsed = ref(readFlag(RUN_COLLAPSED_KEY))
+function readFlag(key: string) {
+  try {
+    return localStorage.getItem(key) === '1'
+  } catch {
+    return false
+  }
+}
+function toggleRunArea(collapsed = !runCollapsed.value) {
+  runCollapsed.value = collapsed
+  try {
+    localStorage.setItem(RUN_COLLAPSED_KEY, collapsed ? '1' : '0')
+  } catch {
+    // 浏览器不让存时只在这次有效
+  }
+}
+
 function run() {
   if (running.value) return
+  toggleRunArea(false)
   session.run(
     files.value.map((f) => ({ ...f })),
     props.assignmentId ? assignment.value?.sampleId : sampleId.value,
@@ -456,6 +496,9 @@ function run() {
           {{ scoreText }}
         </NButton>
       </template>
+      <NButton v-if="selfCheck && !viewing" size="small" title="这个任务自动检查哪些功能；可以自己先检查一遍（不计分）" @click="selfCheckOpen = true">
+        评价项
+      </NButton>
       <NPopconfirm v-if="modified && !viewing" positive-text="恢复" negative-text="取消" @positive-click="restoreOriginal">
         <template #trigger>
           <NButton quaternary size="small">{{ assignmentId ? '恢复到作业起点' : '恢复原始代码' }}</NButton>
@@ -468,7 +511,7 @@ function run() {
         编译 {{ state.metrics.compileMs }} ms · 启动 {{ state.metrics.startMs }} ms · 最近一次操作往返
         {{ state.metrics.lastRoundTripMs }} ms
       </span>
-      <span v-else class="spacer" />
+      <span class="spacer" />
       <RouterLink v-if="!assignmentId && currentUser?.role === 'student'" to="/assignments" class="nav-link">我的作业</RouterLink>
       <RouterLink v-if="!viewing" to="/database" target="_blank" class="nav-link" title="在新标签页打开数据库（代替 SSMS）">数据库</RouterLink>
       <span class="user">
@@ -488,7 +531,18 @@ function run() {
       <GradeResultView :assignment="assignment" :submission="submission" :review="review" />
     </NModal>
 
-    <main class="workspace" :class="{ designing: activeForm }">
+    <SelfCheckPanel
+      v-if="selfCheck"
+      v-model:show="selfCheckOpen"
+      :titles="selfCheck.titles"
+      :target="selfCheck.target"
+      :url="selfCheck.url"
+      :points="selfCheck.points"
+      :files="files"
+      :before-start="flushSave"
+    />
+
+    <main class="workspace" :class="{ designing: activeForm, 'run-collapsed': runCollapsed }">
       <section class="editor">
         <div class="tab-row">
           <NTabs v-model:value="activeTab" type="card" size="small" class="file-tabs">
@@ -559,7 +613,14 @@ function run() {
         />
       </section>
 
-      <RunArea :session="session" @diagnostic="showDiagnostic" />
+      <button
+        class="run-toggle"
+        :title="runCollapsed ? '展开运行区' : '收起运行区（左边的代码和设计器占满宽度，运行时自动展开）'"
+        @click="toggleRunArea()"
+      >
+        {{ runCollapsed ? '◂' : '▸' }}
+      </button>
+      <RunArea v-show="!runCollapsed" :session="session" @diagnostic="showDiagnostic" />
     </main>
   </div>
 </template>
@@ -584,11 +645,17 @@ function run() {
 }
 
 .metrics {
-  margin-left: auto;
   color: #6b7280;
   font-size: 12px;
 }
 
+/* 编译、往返时间是给开发看的，屏幕窄时（机房常见 1366 宽）不显示，免得工具栏挤成两行 */
+@media (max-width: 1599px) {
+  .metrics {
+    display: none;
+  }
+}
+
 .spacer {
   margin-left: auto;
 }
@@ -610,6 +677,11 @@ function run() {
 .save-state {
   color: #6b7280;
   font-size: 12px;
+  white-space: nowrap;
+}
+
+.toolbar > strong {
+  white-space: nowrap;
 }
 
 .save-state.error {
@@ -624,6 +696,7 @@ function run() {
 .nav-link {
   color: #2563eb;
   font-size: 13px;
+  white-space: nowrap;
   text-decoration: none;
   white-space: nowrap;
 }
@@ -631,13 +704,33 @@ function run() {
 .workspace {
   flex: 1;
   display: grid;
-  grid-template-columns: minmax(360px, 2fr) 3fr;
+  grid-template-columns: minmax(360px, 2fr) 14px 3fr;
   min-height: 0;
 }
 
 /* 设计器需要工具箱、窗体和属性窗口，左栏放宽 */
 .workspace.designing {
-  grid-template-columns: minmax(0, 3fr) minmax(360px, 2fr);
+  grid-template-columns: minmax(0, 3fr) 14px minmax(360px, 2fr);
+}
+
+.workspace.run-collapsed {
+  grid-template-columns: minmax(0, 1fr) 14px;
+}
+
+/* 编辑区和运行区之间的竖条：点一下收起、展开运行区 */
+.run-toggle {
+  padding: 0;
+  border: none;
+  border-right: 1px solid #e5e7eb;
+  background: #f3f4f6;
+  color: #6b7280;
+  font-size: 10px;
+  cursor: pointer;
+}
+
+.run-toggle:hover {
+  background: #e5e7eb;
+  color: #111827;
 }
 
 .editor {

web/src/run/RunArea.vue

@@ -2,6 +2,7 @@
 // 运行区：学生程序的窗体（在一块"桌面"上）、提示框、虚拟实训台，以及编译错误和控制台输出。
 // 实验页和老师的评阅页共用。
 import { computed, onBeforeUnmount, onMounted, provide, ref } from 'vue'
+import { loadGallery } from '../designer/resources'
 import TrainingBoard from '../scene/TrainingBoard.vue'
 import type { SizeValue } from '../winforms/format'
 import FormWindow, { WINDOW_MARGIN, WINDOW_STEP } from '../winforms/FormWindow.vue'
@@ -14,6 +15,8 @@ const emit = defineEmits<{ diagnostic: [file: string, line: number, column: numb
 
 const state = props.session.state
 provide(RUN_IMAGES, props.session.images)
+// 素材库清单：认出素材图片，在高分辨率屏幕上换成两倍图
+void loadGallery()
 
 /** 照片列表里点开看大图 */
 const viewing = ref<{ path: string; url: string } | null>(null)
@@ -142,6 +145,8 @@ onBeforeUnmount(() => window.removeEventListener('keydown', onKey))
   border-radius: 4px;
   /* 窗体被拖到桌面外面时可以滚动查看 */
   overflow: auto;
+  /* 窗体、提示框的层级只在桌面里比较，不会盖住网页的抽屉和对话框 */
+  isolation: isolate;
 }
 
 .desktop-canvas {

web/src/teacher/AssignmentDialog.vue

@@ -63,7 +63,7 @@ async function chooseSample(id: string) {
   sampleId.value = id
   title.value = samples.value.find((s) => s.value === id)?.label ?? ''
   try {
-    checkTitles.value = await api<string[]>('GET', `/api/teacher/samples/${encodeURIComponent(id)}/checks`)
+    checkTitles.value = await api<string[]>('GET', `/api/samples/${encodeURIComponent(id)}/checks`)
     auto.value = checkTitles.value.map(() => 10)
   } catch (e) {
     checkTitles.value = []

web/src/winforms/ControlView.vue

@@ -4,7 +4,7 @@
 import { computed, inject, provide, ref, type CSSProperties } from 'vue'
 import type { ControlNode, UserAction } from '@iot/shared'
 import { AMBIENT_BACK_COLOR, AMBIENT_BACK_TYPES, boxCss, DEFAULT_BACK_COLOR, displayText } from './format'
-import { backgroundCss, RUN_IMAGES, type ImageValue } from './images'
+import { backgroundCss, imageSources, RUN_IMAGES, srcset, type ImageValue } from './images'
 import ChartControl from './ChartControl.vue'
 import DataGridViewControl from './DataGridViewControl.vue'
 import DateTimePickerControl from './DateTimePickerControl.vue'
@@ -72,7 +72,7 @@ function selectItem(index: number) {
 
 // PictureBox：按 SizeMode 摆放图片
 const image = computed(() => p.value.Image as ImageValue | null | undefined)
-const imageUrl = computed(() => (image.value ? image.value.url ?? runImages.get(image.value.key) : undefined))
+const imageSrc = computed(() => imageSources(image.value, runImages))
 // 设计器预览里不知道素材的尺寸，原样大小显示时让浏览器按图片本身的大小
 const naturalSize = computed(() => (image.value?.width ? { width: `${image.value.width}px`, height: `${image.value.height}px` } : {}))
 const imageStyle = computed((): CSSProperties => {
@@ -182,7 +182,7 @@ const itemHeight = computed(() => `${(p.value.ItemHeight as number | undefined)
     @pointerdown="mouse('mouseDown', $event)"
     @pointerup="mouse('mouseUp', $event)"
   >
-    <img v-if="imageUrl" :src="imageUrl" :style="imageStyle" alt="" draggable="false" />
+    <img v-if="imageSrc" :src="imageSrc.src" :srcset="srcset(imageSrc)" :style="imageStyle" alt="" draggable="false" />
     <ControlView v-for="child in childrenTopLast" :key="child.id" :node="child" :act="props.act" />
   </div>
 

web/src/winforms/images.ts

@@ -1,6 +1,7 @@
 // 运行时图片：运行器发来的图片数据由 RunSession 保存成 blob 网址，控件属性里只带图片编号。
 // 运行区 provide，ControlView inject；设计器预览没有运行时图片，取到空表。
 import type { CSSProperties, InjectionKey } from 'vue'
+import { gallery } from '../designer/resources'
 
 export const RUN_IMAGES: InjectionKey<ReadonlyMap<string, string>> = Symbol('runImages')
 
@@ -13,12 +14,31 @@ export interface ImageValue {
   url?: string
 }
 
+/**
+ * 图片的网址。素材库里的图片（按编号或素材网址认出来）另有两倍尺寸的版本，
+ * 高分辨率屏幕（系统缩放 150%、200%）上用它，不然浏览器放大原图会发虚；程序读到的宽高不变。
+ */
+export function imageSources(value: unknown, images: ReadonlyMap<string, string>): { src: string; hidpi?: string } | undefined {
+  const image = value as ImageValue | null | undefined
+  if (!image) return undefined
+  const item = gallery.value.find((g) => (image.key && g.key === image.key) || (image.url && image.url === `/resources/${g.file}`))
+  if (item?.hidpi) return { src: `/resources/${item.file}`, hidpi: `/resources/${item.hidpi}` }
+  const src = image.url ?? images.get(image.key)
+  return src ? { src } : undefined
+}
+
+/** <img> 的 srcset：有两倍图时浏览器按屏幕分辨率选 */
+export const srcset = (sources: { src: string; hidpi?: string } | undefined) =>
+  sources?.hidpi ? `${sources.src} 1x, ${sources.hidpi} 2x` : undefined
+
 /** 背景图片的 CSS：BackgroundImageLayout 为 Tile（默认，平铺）、None（左上角一张）、Center、Stretch、Zoom */
 export function backgroundCss(value: unknown, layout: unknown, images: ReadonlyMap<string, string>): CSSProperties {
-  const image = value as ImageValue | null | undefined
-  const url = image ? image.url ?? images.get(image.key) : undefined
-  if (!url) return {}
-  const base = { backgroundImage: `url("${url}")` }
+  const sources = imageSources(value, images)
+  if (!sources) return {}
+  // image-set 里的两倍图按 2x 显示，平铺、居中、左上角时仍是原尺寸
+  const base: CSSProperties = {
+    backgroundImage: sources.hidpi ? `image-set(url("${sources.src}") 1x, url("${sources.hidpi}") 2x)` : `url("${sources.src}")`,
+  }
   switch (layout) {
     case 'None':
       return { ...base, backgroundRepeat: 'no-repeat', backgroundPosition: '0 0' }