fix(danmuku): [PKG-DANMUKU-10] bound dense heatmaps for issue 958

2026-10-08 10:56:15 -08:00 · 2026-09-13 21:20:37 +08:00
1 parent 053d211fb0
commit abc8008da7
@@ -4,4 +4,4 @@
 * (c) 2017-2026 Harvey Zhao
 * Released under the MIT License.
 */
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@@ -4,4 +4,4 @@
 * (c) 2017-2026 Harvey Zhao
 * Released under the MIT License.
 */
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t=this.owner.$refs.pop()||document.createElement("div");return t.style.cssText=this.owner.constructor.cssText,t.dataset.mode="",t.dataset.id="",t.className="",this.nodes.add(t),t}get visibles(){const t=[],{clientWidth:e}=this.owner.$player,i=this.owner.getLeft(this.owner.$player);return this.owner.filter("emit",n=>{const a=n.$ref.offsetTop,s=this.owner.getLeft(n.$ref)-i,r=n.$ref.clientHeight,o=n.$ref.clientWidth,l=s+o,d=e-l,c=l/n.$restTime,p={};p.top=a,p.left=s,p.height=r,p.width=o,p.right=d,p.speed=c,p.distance=l,p.time=n.$restTime,p.mode=n.mode,t.push(p)}),t}left(t){const e=t.getBoundingClientRect();return this.owner.isRotate?e.top:e.left}makeWait(t){this.owner.setState(t,"wait"),t.$ref&&(t.$ref.style.cssText=this.owner.constructor.cssText,t.$ref.style.visibility="hidden",t.$ref.style.marginLeft="0px",t.$ref.style.transform="translateX(0px)",t.$ref.style.transition="transform 0s linear 0s",this.owner.$refs.push(t.$ref),t.$ref=null)}resize(){const{clientWidth:t}=this.owner.$player;this.owner.filter("stop",e=>{if(0===e.mode)e.$ref.style.left=`${t}px`}),this.owner.filter("emitLine truncated
@@ -1239,7 +1239,8 @@ function heatmapGeometry({ width, height, duration, queue, option, points: input
    smoothing: 0.2,
    flattening: 0.2
  };
-  const options = Object.assign({}, defaults, typeof option === "object" ? option : {});
+  const configured = Object.assign({}, typeof option === "object" ? option : {});
+  const options = Object.assign({}, defaults, configured);
  for (const key of Object.keys(defaults)) {
    if (!Number.isFinite(options[key]))
      options[key] = defaults[key];
@@ -1248,7 +1249,8 @@ function heatmapGeometry({ width, height, duration, queue, option, points: input
    options.sampling = defaults.sampling;
  if (options.xMin === options.xMax || options.yMin === options.yMax)
    return null;
-  const points = Array.isArray(input) && input.length ? [...input] : sampleHeatmap(queue, width, duration, options.sampling);
+  const hasCustomPoints = Array.isArray(input) && input.length > 0;
+  const points = hasCustomPoints ? [...input] : sampleHeatmap(queue, width, duration, options.sampling);
  if (!points.length || !points.every((point) => Array.isArray(point) && Number.isFinite(point[0]) && Number.isFinite(point[1]))) {
    return null;
  }
@@ -1269,14 +1271,21 @@ function heatmapGeometry({ width, height, duration, queue, option, points: input
    const y = point[1];
    point[1] = y * (y > yMid ? 1 + options.scale : 1 - options.scale) + options.minHeight;
  }
+  const automatic = !hasCustomPoints && !Number.isFinite(configured.yMin) && !Number.isFinite(configured.yMax);
+  let peak = 0;
+  for (const point of points) peak = Math.max(peak, point[1]);
+  const fitted = automatic && peak > defaults.yMax / 4;
+  if (fitted)
+    options.yMax = peak * 4;
+  const boundY = (value) => fitted ? Math.min(height, Math.max(height * 0.75, value)) : value;
  const controlPoint = (current, previous, next, reverse) => {
    const geometry = line(previous || current, next || current);
    const flat = map(Math.cos(geometry.angle) * options.flattening, 0, 1, 1, 0);
    const angle = geometry.angle * flat + (reverse ? Math.PI : 0);
    const length = geometry.length * options.smoothing;
-    return [current[0] + Math.cos(angle) * length, current[1] + Math.sin(angle) * length];
+    return [current[0] + Math.cos(angle) * length, boundY(current[1] + Math.sin(angle) * length)];
  };
-  const positions = points.map((point) => [map(point[0], options.xMin, options.xMax, 0, width), map(point[1], options.yMin, options.yMax, height, 0)]);
+  const positions = points.map((point) => [map(point[0], options.xMin, options.xMax, 0, width), boundY(map(point[1], options.yMin, options.yMax, height, 0))]);
  if (!positions.every((point) => point.every(Number.isFinite)))
    return null;
  const path = positions.map((point, index, all) => {
@@ -187,6 +187,27 @@ fractional step progression and strict-left/inclusive-right time bins. The
 original points event clones only the outer array and mutates inner y values;
 preserve that observable behavior, including repeated updates.

+Issue #958 is a separate density defect from the earlier zero-step/cleanup fixes.
+Automatic queue sampling keeps the historical 128-unit Y domain until its
+transformed peak exceeds 32 units. Above that threshold, use four times the peak
+as the upper domain and constrain endpoints/Bezier controls to the bottom quarter
+of the chart. Constraining the control polygon bounds the whole cubic; merely
+clipping SVG overflow would retain the tall, flattened block. This is a visual
+correction for sampled high density, not a change to queue counts or timing.
+Small unfitted curves keep their exact old path, including small Bezier overshoot;
+the 25px bound applies to fitted charts, not every possible custom option.
+
+Copy own enumerable option fields once, as the historical Object.assign did;
+do not reread getters or treat inherited axis fields as overrides. Finite explicit
+Y axes and nonempty custom points bypass fitting and preserve old paths and
+caller-visible writes. A resize/loaded event resamples the queue as before.
+`test/danmuku-heatmap.test.js` retains historical paths and tests dense bins,
+peak differences, control bounds and option property semantics.
+`test/browser/danmuku-heatmap-density.spec.js` verifies 16000 uniform, clustered
+and mixed rows using native SVG bounds, playback, progress and resizing against
+both cores in Chromium/Firefox/WebKit. This is heatmap validation; it is not a
+16000-visible-DOM-danmuku throughput or long-duration heap benchmark (task07).
+
 `test/danmuku-setting.test.js` uses Linkedom and real published core utilities
 for template parsing, selectors, events and lifecycle tests. Linkedom has no
 layout; its measured rectangles are controlled inputs, not browser evidence.
@@ -58,6 +58,13 @@ independent gradient for each instance. Its existing points event still changes
 the inner point arrays as before; copy those arrays first if the original values
 must be retained. Removing or replacing its control releases its listeners.

+Dense automatically sampled heatmaps now scale down instead of becoming a tall,
+flat block over the video (issue #958). When the sampled peak exceeds one quarter
+of the chart height, the curve fits inside that bottom quarter (25px in the
+default 100px control). Small curves keep their existing appearance. Explicit
+finite `heatmap.yMin` or `heatmap.yMax`, and custom points events, retain their
+original coordinate mapping; use these when deliberately controlling the scale.
+
 See [ARCHITECTURE.md](./ARCHITECTURE.md) for module ownership, compatibility
 constraints, tests and the remaining staged TypeScript migration.

@@ -4,4 +4,4 @@
 * (c) 2017-2026 Harvey Zhao
 * Released under the MIT License.
 */
-!function(t,e){"object"===typeof exports&&"undefined"!==typeof module?module.exports=e():"function"==typeof define&&define.amd?(t.artplayerPluginDanmuku=e(),define(function(){return t.artplayerPluginDanmuku})):(t="undefined"!==typeof globalThis?globalThis:t||self).artplayerPluginDanmuku=e()}(this,function(){"use strict";function t(t){return t instanceof Promise||"[object Promise]"===Object.prototype.toString.call(t)}function e(t){switch(t){case 1:case 2:case 3:default:return 0;case 4:return 2;case 5:return 1}}function i(t){if("string"!==typeof t)return[];const i=t.matchAll(/<d[^>]*?p="(?<p>[^"]+)"[^>]*>(?<text>.*?)<\/d>/gs);return Array.from(i).map(t=>{const 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0s`;break}}})}continue(){const{clientWidth:t}=this.owner.$player;return this.owner.filter("stop",e=>{switch(this.owner.setState(e,"emit"),e.$lastStartTime=Date.now(),e.mode){case 0:{const i=t+e.$ref.clientWidth;e.$ref.style.transform=`translateX(${-i}px)`,e.$ref.style.transition=`transform ${e.$restTime}s linear 0s`;break}}}),this}suspend(){const{clientWidth:t}=this.owner.$player;return this.owner.filter("emit",e=>{switch(this.owner.setState(e,"stop"),e.mode){case 0:{const i=t-(this.owner.getLeft(e.$ref)-this.owner.getLeft(this.owner.$player));e.$ref.style.transform=`translLine truncated
@@ -4,4 +4,4 @@
 * (c) 2017-2026 Harvey Zhao
 * Released under the MIT License.
 */
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+!function(t,e){"object"===typeof exports&&"undefined"!==typeof module?module.exports=e():"function"==typeof define&&define.amd?(t.artplayerPluginDanmuku=e(),define(function(){return t.artplayerPluginDanmuku})):(t="undefined"!==typeof globalThis?globalThis:t||self).artplayerPluginDanmuku=e()}(this,function(){"use strict";var t=Object.defineProperty,e=Object.defineProperties,i=Object.getOwnPropertyDescriptors,n=Object.getOwnPropertySymbols,a=Object.prototype.hasOwnProperty,s=Object.prototype.propertyIsEnumerable,r=Math.pow,o=(e,i,n)=>i in e?t(e,i,{enumerable:!0,configurable:!0,writable:!0,value:n}):e[i]=n,l=(t,e)=>{for(var i in e||(e={}))a.call(e,i)&&o(t,i,e[i]);if(n)for(var i of n(e))s.call(e,i)&&o(t,i,e[i]);return t},d=(t,n)=>e(t,i(n)),c=(t,e,i)=>new Promise((n,a)=>{var s=t=>{try{o(i.next(t))}catch(e){a(e)}},r=t=>{try{o(i.throw(t))}catch(e){a(e)}},o=t=>t.done?n(t.value):Promise.resolve(t.value).then(s,r);o((i=i.apply(t,e)).next())});function p(t){return t instanceof Promise||"[object 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@@ -1239,7 +1239,8 @@ function heatmapGeometry({ width, height, duration, queue, option, points: input
    smoothing: 0.2,
    flattening: 0.2
  };
-  const options = Object.assign({}, defaults, typeof option === "object" ? option : {});
+  const configured = Object.assign({}, typeof option === "object" ? option : {});
+  const options = Object.assign({}, defaults, configured);
  for (const key of Object.keys(defaults)) {
    if (!Number.isFinite(options[key]))
      options[key] = defaults[key];
@@ -1248,7 +1249,8 @@ function heatmapGeometry({ width, height, duration, queue, option, points: input
    options.sampling = defaults.sampling;
  if (options.xMin === options.xMax || options.yMin === options.yMax)
    return null;
-  const points = Array.isArray(input) && input.length ? [...input] : sampleHeatmap(queue, width, duration, options.sampling);
+  const hasCustomPoints = Array.isArray(input) && input.length > 0;
+  const points = hasCustomPoints ? [...input] : sampleHeatmap(queue, width, duration, options.sampling);
  if (!points.length || !points.every((point) => Array.isArray(point) && Number.isFinite(point[0]) && Number.isFinite(point[1]))) {
    return null;
  }
@@ -1269,14 +1271,21 @@ function heatmapGeometry({ width, height, duration, queue, option, points: input
    const y = point[1];
    point[1] = y * (y > yMid ? 1 + options.scale : 1 - options.scale) + options.minHeight;
  }
+  const automatic = !hasCustomPoints && !Number.isFinite(configured.yMin) && !Number.isFinite(configured.yMax);
+  let peak = 0;
+  for (const point of points) peak = Math.max(peak, point[1]);
+  const fitted = automatic && peak > defaults.yMax / 4;
+  if (fitted)
+    options.yMax = peak * 4;
+  const boundY = (value) => fitted ? Math.min(height, Math.max(height * 0.75, value)) : value;
  const controlPoint = (current, previous, next, reverse) => {
    const geometry = line(previous || current, next || current);
    const flat = map(Math.cos(geometry.angle) * options.flattening, 0, 1, 1, 0);
    const angle = geometry.angle * flat + (reverse ? Math.PI : 0);
    const length = geometry.length * options.smoothing;
-    return [current[0] + Math.cos(angle) * length, current[1] + Math.sin(angle) * length];
+    return [current[0] + Math.cos(angle) * length, boundY(current[1] + Math.sin(angle) * length)];
  };
-  const positions = points.map((point) => [map(point[0], options.xMin, options.xMax, 0, width), map(point[1], options.yMin, options.yMax, height, 0)]);
+  const positions = points.map((point) => [map(point[0], options.xMin, options.xMax, 0, width), boundY(map(point[1], options.yMin, options.yMax, height, 0))]);
  if (!positions.every((point) => point.every(Number.isFinite)))
    return null;
  const path = positions.map((point, index, all) => {
@@ -25,7 +25,8 @@ export function heatmapGeometry({ width, height, duration, queue, option, points
    smoothing: 0.2,
    flattening: 0.2,
  }
-  const options = Object.assign({}, defaults, typeof option === 'object' ? option : {})
+  const configured = Object.assign({}, typeof option === 'object' ? option : {})
+  const options = Object.assign({}, defaults, configured)
  for (const key of Object.keys(defaults)) {
    if (!Number.isFinite(options[key]))
      options[key] = defaults[key]
@@ -34,7 +35,8 @@ export function heatmapGeometry({ width, height, duration, queue, option, points
    options.sampling = defaults.sampling
  if (options.xMin === options.xMax || options.yMin === options.yMax)
    return null
-  const points = Array.isArray(input) && input.length ? [...input] : sampleHeatmap(queue, width, duration, options.sampling)
+  const hasCustomPoints = Array.isArray(input) && input.length > 0
+  const points = hasCustomPoints ? [...input] : sampleHeatmap(queue, width, duration, options.sampling)
  if (!points.length
    || !points.every(point => Array.isArray(point) && Number.isFinite(point[0]) && Number.isFinite(point[1]))) { return null }
  const lastPoint = points[points.length - 1]
@@ -55,14 +57,24 @@ export function heatmapGeometry({ width, height, duration, queue, option, points
    const y = point[1]
    point[1] = y * (y > yMid ? 1 + options.scale : 1 - options.scale) + options.minHeight
  }
+  // Explicit axes and custom points retain their coordinate interpretation. Fit automatic
+  // charts into the lower quarter so dense data cannot obscure the video.
+  const automatic = !hasCustomPoints && !Number.isFinite(configured.yMin) && !Number.isFinite(configured.yMax)
+  let peak = 0
+  for (const point of points) peak = Math.max(peak, point[1])
+  const fitted = automatic && peak > defaults.yMax / 4
+  if (fitted)
+    options.yMax = peak * 4
+  const boundY = value => fitted ? Math.min(height, Math.max(height * 0.75, value)) : value
  const controlPoint = (current, previous, next, reverse) => {
    const geometry = line(previous || current, next || current)
    const flat = map(Math.cos(geometry.angle) * options.flattening, 0, 1, 1, 0)
    const angle = geometry.angle * flat + (reverse ? Math.PI : 0)
    const length = geometry.length * options.smoothing
-    return [current[0] + Math.cos(angle) * length, current[1] + Math.sin(angle) * length]
+    // A cubic stays inside the convex hull of its endpoints and controls.
+    return [current[0] + Math.cos(angle) * length, boundY(current[1] + Math.sin(angle) * length)]
  }
-  const positions = points.map(point => [map(point[0], options.xMin, options.xMax, 0, width), map(point[1], options.yMin, options.yMax, height, 0)])
+  const positions = points.map(point => [map(point[0], options.xMin, options.xMax, 0, width), boundY(map(point[1], options.yMin, options.yMax, height, 0))])
  if (!positions.every(point => point.every(Number.isFinite)))
    return null
  const path = positions.map((point, index, all) => {
@@ -0,0 +1,66 @@
+# PKG-DANMUKU-10：修复 issue #958 密集弹幕热力图遮挡
+
+用户在 PKG-DANMUKU-06 的 TS 迁移过程中补充
+[issue #958](https://github.com/zhw2590582/ArtPlayer/issues/958)，要求顺便检查并修复。
+本修复基于已提交的 PKG-DANMUKU-05（053d211fb），在独立 worktree 完成，
+有自己的任务与提交；06 的未完成 TS/声明工作不计入本任务。
+
+## 复现与原因
+
+Issue 描述加载约 1.6 万条弹幕后热力图变高，评论进一步确认顶部被拉平。
+原截图和反馈来自 Chrome 136 / macOS 13；本次没有取得报告者的原始弹幕数据，
+使用确定性的 16000 条均匀、集中和混合分布独立复现同类问题。
+
+默认 yMax 固定为 128，采样数量经 scale/minHeight 变换后可能远大于128。
+在真实 Chromium、旧核心、新候选插件的未修复代码上，均匀分布 SVG
+getBBox().y 为 -65.23090362548828；100px 容器裁掉曲线，留下全高平块。
+控制点还可能超出端点范围，因此仅扩大 yMax 或增加 overflow:hidden 不够。
+
+## 修复与兼容边界
+
+- 只修改 heatmap-geometry 的自动纵轴计算；采样计数、队列、渲染调度和公开入口不变。
+- 自动采样的变换后峰值超过32时，yMax采用峰值的4倍，将密集热图拟合到底部四分之一。
+  当前100px控制容器中为25px；同时约束曲线端点和控制点，使Bezier不会重新越界。
+- 小曲线保留旧 SVG 路径，包括未触发拟合时的小幅Bezier过冲。
+  25px约束只承诺触发拟合的默认密集图，不是所有自定义曲线的全局限制。
+- 显式有限 yMin/yMax 和非空自定义 points 继续使用旧坐标解释。
+  原points嵌套数组写入、重复变换、resize后重新采样均有原历史差分保护。
+- 配置自有可枚举字段只读取一次；getter、原型字段和非枚举字段遵循原Object.assign语义。
+- CSS类、100px控制容器、渐变/进度钩子、opacity、销毁归属、类型定义和分发入口均保留。
+  这是用户要求的视觉缺陷修正；采用显式坐标域的旧自定义图不被强制改样式。
+
+## 验证
+
+最终执行结果、候选文件指纹、浏览器版本、每条用例结果与原生几何/媒体观察，见
+[机器证据](../baselines/danmuku-heatmap-density-validation.json)。
+
+- `yarn test:danmuku`：250通过，包括热图19项、真实历史路径和配置属性语义。
+- `yarn build artplayer-plugin-danmuku`：main/legacy/ESM及docs拷贝成功。
+- 定向只读ESLint通过。102项原生浏览器通过：源码、main、legacy均执行同一密度浏览器矩阵；
+  每种格式为两核心×三分布×三引擎，另外main执行原48项资源浏览器回归。
+- 实际解码并在安装插件后继续播放；验证原生timeupdate渐变变化，再暂停检查
+  640/400宽度的SVG局部边界、实际屏幕像素高度、进度及destroy清理。
+- 使用Windows上的Playwright Chromium/Firefox/WebKit；这不是报告者macOS/Chrome136的真机验收，
+  也不是16000条同时可见DOM弹幕的吞吐、长时内存或完整播放调度压力测试。后者仍归07。
+
+## 复核中处理的问题
+
+首次浏览器夹具误将plugins.add的返回值当插件；该次在load前失败，单独留档，
+不作为缺陷红测。修正取注册插件后得到上面的真实越界红测。
+首版拟合改变了第二次custom points的旧路径；保留失败日志并限制自动采样范围，
+原测试未删除或放宽。子代理只读复核进一步发现getter重复读取/原型轴误识别以及
+“仅在安装前播放”的证据不足，均已在实现或夹具中修正。
+同时修正null/非数组points仍应回退队列采样的旧宽容行为；拟合判断复用同一输入分类。
+
+独立worktree复用了主工作区的缓存，契约报告路径保护和Node reporter路径断言因此
+分别拒绝重定向路径和出现8/9通过。未放宽检查器；修复提交快进回主重构工作区后，
+契约检查和同一组9项元数据测试全部通过。Git检出把计划表转为CRLF，按既有
+`plan.mjs --write`重新生成后`--check`通过。每任务提交审计确认145个完成任务、
+141个独立完成提交及原4个引导例外。上述环境差异不计为生产热力图失败。
+
+## 维护与回退
+
+模块地图和默认/显式坐标域边界同步写入包README及ARCHITECTURE。
+无需新依赖或锁文件变更；复用Yarn1.22.22、Node24.21.0和已有构建、Node测试、Playwright。
+回退本任务的单个commit可恢复旧曲线与产物；回退会重新引入#958，不影响06的类型迁移计划。
+本地提交不代表推送、关闭远端issue或npm发布；全包major升级和发布复盘按原计划继续。
@@ -2,9 +2,9 @@

 > 由 tasks.json 生成。请修改数据后运行 `node refactor/scripts/plan.mjs --write`，不要手改本表。

-基线：`40fcda6a37d0049d42e49c1e64e70d4fd9ba5f7f`。总任务 228 项，范围 22 个包及工作区/示例。
+基线：`40fcda6a37d0049d42e49c1e64e70d4fd9ba5f7f`。总任务 229 项，范围 22 个包及工作区/示例。

-状态：todo 69 / doing 15 / blocked 0 / done 144 / deferred 0。风险 L/M/H 表示兼容风险，不表示工期。
+状态：todo 69 / doing 15 / blocked 0 / done 145 / deferred 0。风险 L/M/H 表示兼容风险，不表示工期。

 前置依赖是启动条件；验收是完成条件。任务可以继续拆分，但不能复用或悄悄删除旧 ID。

@@ -22,7 +22,7 @@
 | artplayer-plugin-auto-thumbnail | 1.1.0 | PKG-AUTO-THUMB-01, PKG-AUTO-THUMB-02, PKG-AUTO-THUMB-03, PKG-AUTO-THUMB-04, PKG-AUTO-THUMB-05, PKG-AUTO-THUMB-06 |
 | artplayer-plugin-chapter | 1.1.0 | PILOT-01, PKG-CHAPTER-01, PKG-CHAPTER-02, PKG-CHAPTER-03, PKG-CHAPTER-04, PKG-CHAPTER-05, PKG-CHAPTER-06 |
 | artplayer-plugin-chromecast | 1.1.0 | PKG-CAST-01, PKG-CAST-02, PKG-CAST-03, PKG-CAST-04, PKG-CAST-05, PKG-CAST-06 |
-| artplayer-plugin-danmuku | 5.3.0 | PKG-DANMUKU-01, PKG-DANMUKU-02, PKG-DANMUKU-03, PKG-DANMUKU-04, PKG-DANMUKU-05, PKG-DANMUKU-06, PKG-DANMUKU-07, PKG-DANMUKU-08, PKG-DANMUKU-09 |
+| artplayer-plugin-danmuku | 5.3.0 | PKG-DANMUKU-01, PKG-DANMUKU-02, PKG-DANMUKU-03, PKG-DANMUKU-04, PKG-DANMUKU-05, PKG-DANMUKU-06, PKG-DANMUKU-07, PKG-DANMUKU-08, PKG-DANMUKU-09, PKG-DANMUKU-10 |
 | artplayer-plugin-danmuku-mask | 1.1.0 | PKG-MASK-01, PKG-MASK-02, PKG-MASK-03, PKG-MASK-04, PKG-MASK-05, PKG-MASK-06 |
 | artplayer-plugin-dash-control | 1.1.0 | PKG-DASH-01, PKG-DASH-02, PKG-DASH-03, PKG-DASH-04, PKG-DASH-05, PKG-DASH-06 |
 | artplayer-plugin-document-pip | 1.1.0 | PKG-DPIP-01, PKG-DPIP-02, PKG-DPIP-03, PKG-DPIP-04, PKG-DPIP-05, PKG-DPIP-06 |
@@ -315,9 +315,10 @@
 | PKG-DANMUKU-04 | artplayer-plugin-danmuku<br>整理时钟、队列与轨道调度 | PKG-DANMUKU-03, CORE-10 | danmuku 调度器和确定性时钟测试 | seek/暂停/倍率/长时间运行无顺序和碰撞回归 | H | done |
 | PKG-DANMUKU-05 | artplayer-plugin-danmuku<br>整理 DOM 渲染、设置、热力图与 worker | PKG-DANMUKU-04, CORE-14, CORE-18 | renderer/setting/heatmap/worker 职责及资源归属 | mount/icons/设置和 worker 协议保持，销毁无后台工作 | H | done |
 | PKG-DANMUKU-06 | artplayer-plugin-danmuku<br>迁移 TS 与公开声明 | PKG-DANMUKU-05, ENG-04, ENG-06 | 自有模块、worker 消息、option/item/result 类型 | 旧参数、扩展字段和事件消费通过，vendored 边界清楚 | H | doing |
-| PKG-DANMUKU-07 | artplayer-plugin-danmuku<br>弹幕能力稳定性验收 | PKG-DANMUKU-06 | 负载/渲染/资源对比及 mask 可依赖的稳定边界 | 在试点核心中旧插件 API 与关键帧路径通过 | H | todo |
+| PKG-DANMUKU-07 | artplayer-plugin-danmuku<br>弹幕能力稳定性验收 | PKG-DANMUKU-06, PKG-DANMUKU-10 | 负载/渲染/资源对比及 mask 可依赖的稳定边界 | 在试点核心中旧插件 API 与关键帧路径通过 | H | todo |
 | PKG-DANMUKU-08 | artplayer-plugin-danmuku<br>完成新旧核心与组合验收 | PKG-DANMUKU-07, CORE-22 | 最终核心/旧核心、mask/fullscreen/PiP 组合报告 | 性能无未解释退化，反复装卸无累计资源 | H | todo |
 | PKG-DANMUKU-09 | artplayer-plugin-danmuku<br>完成分发、示例与文档 | PKG-DANMUKU-08, ENG-07 | danmuku.js、README、声明、worker 与产物 | tarball 和静态 icons 等旧调用通过，有独立回退版本 | H | todo |
+| PKG-DANMUKU-10 | artplayer-plugin-danmuku<br>修复 issue958 密集热力图过高与曲线裁平 | PKG-DANMUKU-05 | 自动密度缩放与曲线边界、历史自定义坐标兼容及真实浏览器红绿证据 | 16000条三种分布在两核心三引擎和source/main/legacy不遮挡；显式轴和自定义points保持旧解释，有单独commit | M | done |

 ## 5 包迁移：artplayer-proxy-canvas

@@ -586,3 +587,4 @@
 - PKG-ASR-07: [记录](changes/2026-09-13-PKG-ASR-07-playback-volume.md) [记录](baselines/asr-volume-validation.json)
 - PKG-ASR-08: [记录](changes/2026-09-13-PKG-ASR-08-capture-output.md) [记录](baselines/asr-fallback-validation.json)
 - PKG-ASR-09: [记录](changes/2026-09-13-PKG-ASR-09-explicit-capture.md) [记录](baselines/asr-explicit-capture-validation.json)
+- PKG-DANMUKU-10: [记录](changes/2026-09-13-PKG-DANMUKU-10-heatmap-density.md) [记录](baselines/danmuku-heatmap-density-validation.json)
@@ -1,5 +1,13 @@
 # 进度与证据

+## PKG-DANMUKU-10：issue #958 密集热力图修复
+
+用户新增的16000条弹幕热图过高/裁平已独立复现并修复。自动密度拟合到底部四分之一，
+保留显式坐标、自定义points、getter和历史生命周期。完整弹幕250项与102项真实浏览器
+通过，包含两核心/三引擎/三格式；构建和lint通过。详见[变更](changes/2026-09-13-PKG-DANMUKU-10-heatmap-density.md)及[证据](baselines/danmuku-heatmap-density-validation.json)。
+229项：145 done、15 doing、69 todo。06的TS迁移仍进行中，07长负载与发布复盘未完成。
+独立本地提交；未推送、未发布、未关闭远端issue。
+
 ## PKG-DANMUKU-05 渲染、设置与热力图完成

 拆renderer、Setting模板/滑块/发送/资源/全局样式和heatmap采样/几何/生命周期。
@@ -238,3 +238,4 @@
 | DANMUKU-TRACK-01 | resolved / 已复现 | Native simultaneous fixed Danmuku comments can overlap with duplicate start loops and repeated Worker IDs | PKG-DANMUKU-04, PKG-DANMUKU-05, PKG-DANMUKU-07 |
 | DANMUKU-INPUT-02 | resolved / 已复现 | Intermediate explicit-zero correction regressed accepted NaN timestamp fallback | PKG-DANMUKU-04 |
 | DANMUKU-LOAD-01 | open / 待取证 | Native lifecycle fixtures sometimes miss timestamp eligibility during concurrent workload; real frame/window behavior needs load evidence | PKG-DANMUKU-07 |
+| DANMUKU-HEATMAP-02 | resolved / 已复现 | Issue958 dense automatic heatmaps exceed the fixed Y domain and flatten across video | PKG-DANMUKU-10 |
@@ -5288,6 +5288,28 @@
      ],
      "compatibleResolution": "Capture native RAF/media-time gaps and scheduled/eligible/visible item counts under realistic load before deciding whether the old plus/minus 0.1 second eligibility rule needs a compatible correction.",
      "closureCriteria": "Real load runs explain missing scheduled items with frame and media evidence, and any confirmed implementation defect has a regression and compatible fix; seeding ready in lifecycle fixtures is not closure evidence."
+    },
+    {
+      "id": "DANMUKU-HEATMAP-02",
+      "title": "Issue958 dense automatic heatmaps exceed the fixed Y domain and flatten across video",
+      "confirmation": "reproduced",
+      "status": "resolved",
+      "owners": [
+        "PKG-DANMUKU-10"
+      ],
+      "evidence": [
+        "refactor/changes/2026-09-13-PKG-DANMUKU-10-heatmap-density.md",
+        "refactor/baselines/danmuku-heatmap-density-validation.json",
+        "test/danmuku-heatmap.test.js",
+        "test/browser/danmuku-heatmap-density.spec.js"
+      ],
+      "compatibleResolution": "Fit dense automatically sampled curves while preserving explicit axes, custom points, option property semantics and lifecycle.",
+      "closureCriteria": "Native playback, SVG/screen bounds, gradients and resize verified for uniform/clustered/mixed 16000 rows on both cores; historical custom paths retain exact behavior.",
+      "resolutionEvidence": [
+        "refactor/changes/2026-09-13-PKG-DANMUKU-10-heatmap-density.md",
+        "refactor/baselines/danmuku-heatmap-density-validation.json"
+      ],
+      "resolutionRationale": "250 unit tests and 102 native browser cases passed, including source/main/legacy density matrices and main resource regression. No claim of full load or macOS device acceptance."
    }
  ]
 }
@@ -3376,7 +3376,8 @@
        "artplayer-plugin-danmuku"
      ],
      "dependsOn": [
-        "PKG-DANMUKU-06"
+        "PKG-DANMUKU-06",
+        "PKG-DANMUKU-10"
      ],
      "status": "todo",
      "risk": "H",
@@ -4658,6 +4659,25 @@
        "changes/2026-09-13-PKG-ASR-09-explicit-capture.md",
        "baselines/asr-explicit-capture-validation.json"
      ]
+    },
+    {
+      "id": "PKG-DANMUKU-10",
+      "phase": "5 包迁移：artplayer-plugin-danmuku",
+      "title": "修复 issue958 密集热力图过高与曲线裁平",
+      "scope": [
+        "artplayer-plugin-danmuku"
+      ],
+      "dependsOn": [
+        "PKG-DANMUKU-05"
+      ],
+      "status": "done",
+      "risk": "M",
+      "deliverable": "自动密度缩放与曲线边界、历史自定义坐标兼容及真实浏览器红绿证据",
+      "acceptance": "16000条三种分布在两核心三引擎和source/main/legacy不遮挡；显式轴和自定义points保持旧解释，有单独commit",
+      "evidence": [
+        "changes/2026-09-13-PKG-DANMUKU-10-heatmap-density.md",
+        "baselines/danmuku-heatmap-density-validation.json"
+      ]
    }
  ]
 }
@@ -0,0 +1,82 @@
+import fs from 'node:fs'
+import process from 'node:process'
+import { hash } from '../../refactor/scripts/releases.mjs'
+import { compilePackage } from '../helpers/load.js'
+import { expect, test } from './fixtures.js'
+
+let candidate
+test.beforeAll(async () => {
+  candidate = process.env.ARTPLAYER_DANMUKU_ARTIFACT
+    ? fs.readFileSync(process.env.ARTPLAYER_DANMUKU_ARTIFACT, 'utf8')
+    : await compilePackage('artplayer-plugin-danmuku', 'umd')
+})
+
+for (const core of ['published', 'candidate']) {
+  for (const distribution of ['uniform', 'clustered', 'mixed']) {
+    test(`${core}: #958 ${distribution} 16000-row heatmap remains below 25px during playback and resize`, async ({ page }, testInfo) => {
+      await page.goto(`/test/player.html?core=${core}`)
+      await page.addScriptTag({ content: candidate })
+      await page.evaluate(() => window.createPlayer('/test/pattern.mp4'))
+      await page.click('#play')
+      await expect.poll(() => page.evaluate(() => window.art.video.currentTime)).toBeGreaterThan(0.1)
+      await page.click('#pause')
+      await page.evaluate(async (distribution) => {
+        const art = window.art
+        const rows = Array.from({ length: 16000 }, (_, index) => ({
+          text: `density-${index}`,
+          time: distribution === 'clustered' ? art.duration / 2 : distribution === 'mixed' && index < 8000 ? art.duration / 2 : (index + 0.5) * art.duration / 16000,
+        }))
+        art.plugins.add(window.artplayerPluginDanmuku({ danmuku: [], heatmap: true, visible: false, emitter: false }))
+        window.densityPlugin = art.plugins.artplayerPluginDanmuku
+        window.densityOwner = await window.densityPlugin.load(rows)
+        art.controls.show = true
+      }, distribution)
+      const before = await page.evaluate(() => ({
+        time: window.art.video.currentTime,
+        offset: window.art.controls.heatmap.querySelector('#heatmap-start').getAttribute('offset'),
+      }))
+      await page.click('#play')
+      await expect.poll(() => page.evaluate(() => window.art.video.currentTime)).toBeGreaterThan(before.time + 0.1)
+      await expect.poll(() => page.evaluate(() => window.art.controls.heatmap.querySelector('#heatmap-start').getAttribute('offset'))).not.toBe(before.offset)
+      await page.click('#pause')
+      const observations = []
+      for (const width of [640, 400]) {
+        const observation = await page.evaluate((width) => {
+          const art = window.art
+          art.template.$container.style.width = `${width}px`
+          art.emit('resize')
+          art.emit('setBar', 'played', 0.4)
+          const control = art.controls.heatmap
+          const path = control.querySelector('path')
+          const box = path.getBBox()
+          const pixels = path.getBoundingClientRect()
+          return {
+            width: control.offsetWidth,
+            height: control.offsetHeight,
+            box: { x: box.x, y: box.y, width: box.width, height: box.height },
+            pixels: { x: pixels.x, y: pixels.y, width: pixels.width, height: pixels.height },
+            path: path.getAttribute('d'),
+            progress: control.querySelector('#heatmap-start').getAttribute('offset'),
+            rows: window.densityOwner.queue.length,
+            decoded: { width: art.video.videoWidth, time: art.video.currentTime },
+          }
+        }, width)
+        observations.push(observation)
+        expect(observation.rows).toBe(16000)
+        expect(observation.height).toBe(100)
+        expect(observation.box.y).toBeGreaterThanOrEqual(75 - 0.001)
+        expect(observation.box.height).toBeLessThanOrEqual(25 + 0.001)
+        expect(observation.pixels.height).toBeGreaterThan(0)
+        expect(observation.pixels.width).toBeGreaterThan(0)
+        expect(observation.pixels.height).toBeLessThanOrEqual(25 + 0.01)
+        expect(observation.box.y + observation.box.height).toBeLessThanOrEqual(100 + 0.001)
+        expect(observation.progress).toBe('40%')
+        expect(observation.decoded.width).toBeGreaterThan(0)
+      }
+      await testInfo.attach('heatmap-density-evidence', { contentType: 'application/json', body: JSON.stringify({ core, distribution, candidateSha256: hash(candidate), observations }) })
+      await testInfo.attach('heatmap-density-page', { contentType: 'image/png', body: await page.screenshot() })
+      await page.evaluate(() => window.art.destroy(false))
+      await expect(page.locator('.art-control-heatmap')).toHaveCount(0)
+    })
+  }
+}
@@ -84,6 +84,78 @@ function listenerCount(env) {
  return [...env.listeners.values()].reduce((sum, list) => sum + list.length, 0)
 }

+function verticalCoordinates(path) {
+  const values = path.match(/-?\d+(?:\.\d+)?(?:e[+-]?\d+)?/giu).map(Number)
+  return values.filter((_, index) => index % 2 === 1)
+}
+
+test('heatmap #958: 16000 uniform, clustered and mixed rows stay in a 25px band without losing peaks', () => {
+  for (const distribution of ['uniform', 'clustered', 'mixed']) {
+    const queue = Array.from({ length: 16000 }, (_, index) => ({
+      time: distribution === 'clustered' ? 30 : distribution === 'mixed' && index < 8000 ? 30 : (index + 0.5) * 60 / 16000,
+    }))
+    for (const width of [400, 640, 1920]) {
+      const shape = heatmapGeometry({ width, height: 100, duration: 60, queue, option: true })
+      const coordinates = verticalCoordinates(shape.path)
+      assert(Math.min(...coordinates) >= 75, `${distribution}/${width}: top ${Math.min(...coordinates)}`)
+      assert(Math.max(...coordinates) <= 100, `${distribution}/${width}: bottom ${Math.max(...coordinates)}`)
+      if (distribution === 'mixed') {
+        const endpoints = [...shape.path.matchAll(/C [^Cz]+/gu)].map(segment => verticalCoordinates(segment[0]).at(-1))
+        assert(new Set(endpoints.map(value => value.toFixed(3))).size > 2, 'Dense peaks must remain distinct from the background and zero bin')
+      }
+    }
+  }
+})
+
+test('heatmap #958: automatic scaling bounds Bezier controls around adjacent peaks', () => {
+  const queue = Array.from({ length: 172 }, (_, index) => ({ time: index < 86 ? 0.9 : 1.5 }))
+  const shape = heatmapGeometry({ width: 400, height: 100, duration: 60, queue, option: true })
+  const coordinates = verticalCoordinates(shape.path)
+  assert(Math.min(...coordinates) >= 75)
+  assert(Math.max(...coordinates) <= 100)
+})
+
+test('heatmap #958: axis overrides read own enumerable getters once and ignore inherited fields', () => {
+  const queue = Array.from({ length: 16000 }, () => ({ time: 30 }))
+  const geometry = option => heatmapGeometry({ width: 400, height: 100, duration: 60, queue, option })
+  let reads = 0
+  const option = {
+    get yMax() {
+      assert.equal(++reads, 1)
+      return 128
+    },
+  }
+  assert.equal(geometry(option).path, geometry({ yMax: 128 }).path)
+  assert.equal(reads, 1)
+  assert.equal(geometry(Object.create({ yMax: 500 })).path, geometry(true).path)
+  assert.equal(geometry(Object.defineProperty({}, 'yMax', { value: 500 })).path, geometry(true).path)
+})
+
+test('heatmap #958: non-array points retain queue fallback and density fitting', () => {
+  const queue = Array.from({ length: 16000 }, () => ({ time: 30 }))
+  const geometry = points => heatmapGeometry({ width: 400, height: 100, duration: 60, queue, option: true, points })
+  for (const points of [null, false, 'points', { length: 1 }, {}, []])
+    assert.equal(geometry(points).path, geometry(undefined).path)
+})
+
+test('heatmap #958: explicit axes retain the historical dense-data mapping', async () => {
+  const queue = Array.from({ length: 16000 }, (_, index) => ({ time: (index + 0.5) * 60 / 16000 }))
+  for (const option of [{ yMax: 128 }, { yMin: 0 }, { yMin: -10, yMax: 500, scale: 0.4 }]) {
+    const candidate = fixture({ queue })
+    candidate.install(option)
+    candidate.art.emit('ready')
+    for (const implementation of historical) {
+      const env = danmukuEnvironment(implementation, { heatmapWidth: 400 })
+      const plugin = env.factory({ danmuku: [], heatmap: option })(env.art)
+      await env.flush()
+      plugin.show().queue = queue
+      env.art.emit('ready')
+      assert.equal(pathOf(candidate.element), pathOf(env.controls[0].element), `${implementation.name} / ${JSON.stringify(option)}`)
+      env.destroy()
+    }
+  }
+})
+
 test('heatmap: sampled SVG path matches frozen source and actual 5.3.0 main/legacy for legal options', async () => {
  const queue = [0, 0.6, 1, 2, 2, 2.1, 8, 15, 28, 59.9, 60, Number.NaN, Infinity, -Infinity].map(time => ({ time }))
  for (const option of [true, { sampling: 2.5, smoothing: 0.3, flattening: 0.1, scale: 0.4, opacity: 0.7, minHeight: 2, xMin: -10, xMax: 450, yMin: -1, yMax: 40 }]) {