Anki learners requested distinguishable statistics colors in issue 3813. Contributors resuming the proposed option need disabled mode to preserve existing behavior. This repair removes two regressions from that unfinished proposal.

diff --git a/ts/routes/graphs/calendar.ts b/ts/routes/graphs/calendar.ts
index f8048c7..7005d76 100644
--- a/ts/routes/graphs/calendar.ts
+++ b/ts/routes/graphs/calendar.ts
@@ -137,13 +137,14 @@ export function renderCalendar(
         }
     }
     const data = Array.from(dayMap.values());
-    const cappedRange = scaleLinear().range([1, 0]);
+    const cappedRange = scaleLinear().range([0.2, nightMode ? 0.8 : 1]);
 
     const isColorBlindMode = (window as any).colorBlindMode;
 
     let gradient;
 
     if (isColorBlindMode) {
+        cappedRange.range([1, 0]);
         gradient = scaleSequentialSqrt()
             .domain([0, maxCount])
             .interpolator((n) => interpolateMagma(cappedRange(n)!));
diff --git a/ts/routes/graphs/card-counts.ts b/ts/routes/graphs/card-counts.ts
index 157ab33..7038864 100644
--- a/ts/routes/graphs/card-counts.ts
+++ b/ts/routes/graphs/card-counts.ts
@@ -51,7 +51,7 @@ if ((window as any).colorBlindMode) {
         schemeGreens[5][2], /* young */
         schemeGreens[5][3], /* mature */
         "#FFDC41", /* suspended */
-        "#grey", /* buried */
+        "grey", /* buried */
     ];
 }
 

import assert from 'node:assert/strict';
import fs from 'node:fs';
import vm from 'node:vm';
import * as d3 from 'd3';
import ts from 'typescript';

// Evaluate only the inspected palette construction blocks, not Anki's UI.
const [checkout, baselinePath, originalPath] = process.argv.slice(2);
const graphDir = `${checkout}/ts/routes/graphs`;
const calendar = fs.readFileSync(`${graphDir}/calendar.ts`, 'utf8');
const baseline = fs.readFileSync(baselinePath, 'utf8');
const original = fs.readFileSync(originalPath, 'utf8');
function scale(source, nightMode, colorBlindMode) {
  const start = source.indexOf('    const cappedRange =', source.indexOf('const data = Array.from(dayMap.values())'));
  const end = source.indexOf('    function tooltipText', start);
  assert(start >= 0 && end > start, 'calendar palette block found');
  const block = source.slice(start, end);
  const name = block.includes('let gradient') ? 'gradient' : 'blues';
  const script = ts.transpileModule(block + `\nresult = ${name};`, {
    compilerOptions: { target: ts.ScriptTarget.ES2022 }
  }).outputText;
  const context = {...d3, nightMode, maxCount: 100, window: {colorBlindMode}};
  vm.runInNewContext(script, context, {timeout: 1000});
  return context.result;
}

let failures = 0;
function test(name, fn) {
  try { fn(); console.log(`PASS ${name}`); }
  catch (e) { failures++; console.log(`FAIL ${name}: ${e.message}`); }
}
for (const night of [false, true]) {
  test(`default calendar matches baseline for all nonempty counts 1..100; night=${night}`, () => {
    const expected = scale(baseline, night, false);
    const actual = scale(calendar, night, false);
    for (let count = 1; count <= 100; count++) {
      assert.equal(actual(count), expected(count), `count=${count}`);
    }
  });
  test(`enabled calendar preserves proposed palette for all counts 0..100; night=${night}`, () => {
    const expected = scale(original, night, true);
    const actual = scale(calendar, night, true);
    for (let count = 0; count <= 100; count++) assert.equal(actual(count), expected(count));
  });
}
const cardSource = fs.readFileSync(`${graphDir}/card-counts.ts`, 'utf8');
const block = cardSource.slice(cardSource.indexOf('let barColours;'), cardSource.indexOf('function countCards'));
assert(block.startsWith('let barColours;'), 'card palette block found');
const helpers = fs.readFileSync(`${graphDir}/graph-helpers.ts`, 'utf8');
const palette = helpers.match(/export const colorBlindColors = (\{[\s\S]*?\});/);
assert(palette, 'proposed palette found');
for (const enabled of [false, true]) {
  test(`all seven card colors parse; enabled=${enabled}`, () => {
    const context = {...d3, window: {colorBlindMode: enabled}};
    const code = `const colorBlindColors = ${palette[1]};\n${block}\nresult = barColours;`;
    vm.runInNewContext(ts.transpileModule(code, {}).outputText, context, {timeout: 1000});
    assert.equal(context.result.length, 7);
    for (const color of context.result) assert(d3.color(color), `invalid color ${color}`);
  });
}
console.log(`${6-failures}/6 checks passed. Scope: palette logic only; no Qt or browser integration.`);
process.exitCode = failures ? 1 : 0;

FAIL default calendar matches baseline for all nonempty counts 1..100; night=false: count=1
+ actual - expected

+ 'rgb(10, 74, 144)'
- 'rgb(187, 215, 235)'
        ^

PASS enabled calendar preserves proposed palette for all counts 0..100; night=false
FAIL default calendar matches baseline for all nonempty counts 1..100; night=true: count=1
+ actual - expected

+ 'rgb(10, 74, 144)'
- 'rgb(193, 218, 237)'
        ^

PASS enabled calendar preserves proposed palette for all counts 0..100; night=true
FAIL all seven card colors parse; enabled=false: invalid color #grey
PASS all seven card colors parse; enabled=true
3/6 checks passed. Scope: palette logic only; no Qt or browser integration.

PASS default calendar matches baseline for all nonempty counts 1..100; night=false
PASS enabled calendar preserves proposed palette for all counts 0..100; night=false
PASS default calendar matches baseline for all nonempty counts 1..100; night=true
PASS enabled calendar preserves proposed palette for all counts 0..100; night=true
PASS all seven card colors parse; enabled=false
PASS all seven card colors parse; enabled=true
6/6 checks passed. Scope: palette logic only; no Qt or browser integration.

[
  {
    "file": "ts/routes/graphs/calendar.ts",
    "url": "https://raw.githubusercontent.com/ankitects/anki/482cab50d42d2c43e6fc74bab50344efd6e9c776/ts/routes/graphs/calendar.ts",
    "before_sha256": "06f77879ee760313da48e3eed635ff625e45eee555691a7ad8cdd791fe50236e",
    "after_sha256": "40f31fdd03271738808fd650b221af9d2a162db5af15d7ccddbf1f9e0f1a8931"
  },
  {
    "file": "ts/routes/graphs/card-counts.ts",
    "url": "https://raw.githubusercontent.com/ankitects/anki/482cab50d42d2c43e6fc74bab50344efd6e9c776/ts/routes/graphs/card-counts.ts",
    "before_sha256": "724e79a8f54d9cbadc3a3ee0a7d6fcd1b9adebd074e84f85b02975122e0ab2b1",
    "after_sha256": "1d4e515e9a6e1574504cc971bacb17da4141c563bd89d8be30d9094eb8fd3f21"
  },
  {
    "file": "ts/routes/graphs/graph-helpers.ts",
    "url": "https://raw.githubusercontent.com/ankitects/anki/482cab50d42d2c43e6fc74bab50344efd6e9c776/ts/routes/graphs/graph-helpers.ts",
    "before_sha256": "db8abb7273b8f3094b8bf932fcffa35e778834c647ab74552b4af292c1309d9f",
    "after_sha256": "db8abb7273b8f3094b8bf932fcffa35e778834c647ab74552b4af292c1309d9f"
  },
  {
    "file": "calendar-base.ts",
    "url": "https://raw.githubusercontent.com/ankitects/anki/01b825f7c66ced339983f68354d4d9a811a96e41/ts/routes/graphs/calendar.ts",
    "sha256": "d4fb1ce49d9960b22ff539a435afe3c6f138790306ad4340d3ee4201d185cc7d"
  }
]

# Anki accessibility proposal: two default-mode regression repairs

This is a focused repair kit for [Anki PR 4268](https://github.com/ankitects/anki/pull/4268), at commit `482cab50d42d2c43e6fc74bab50344efd6e9c776`. It is not a complete revival of that PR or a patch against current main.

With color-blind mode disabled, the proposal reverses the calendar scale and removes the existing night-mode range. It also changes the buried-card color from `grey` to invalid `#grey`. The patch restores the default range and valid color, preserving the proposed enabled-mode palette.

## Reproduce

In the extracted folder, install the pinned test dependencies and run:

```sh
npm ci --ignore-scripts --no-audit --no-fund
node check.mjs before calendar-base.ts before/ts/routes/graphs/calendar.ts
node check.mjs after calendar-base.ts before/ts/routes/graphs/calendar.ts
```

The first command running checks intentionally exits 1: three of six checks fail. The second exits 0: all six pass. The checks execute the palette construction blocks extracted from the included source files, using D3 7.9.0 and TypeScript 5.9.2. They compare default calendar colors for every integer count 1–100 in both themes, preserve enabled-mode colors for counts 0–100 in both themes, and parse all seven card colors with the mode both off and on. Empty calendar days have a separate rendering path and are excluded from default-scale comparisons.

`before/` contains three source files from the pinned PR head. `after/` contains those files with the supplied patch applied. `calendar-base.ts` is from base commit `01b825f7c66ced339983f68354d4d9a811a96e41`. `sources.json` records source URLs and SHA-256 digests. Source files retain their original copyright and AGPL notices; see `LICENSE`.

## Limits and remaining work

These are focused palette-logic tests, not Qt, browser rendering, or user accessibility tests. `git diff --check` passed. The full `./ninja check` was attempted but stopped because `cargo` is unavailable. No full-build success, merge, deployment, or user benefit is claimed.

The earlier maintainer requests still need attention: initialization through the graph startup path for mobile compatibility, checkbox state handling, and contributor licensing. This kit does not change those parts or claim to resolve the entire issue.

Prepared by Codex. The original accessibility feature is the work of the PR's contributors; this contribution consists of the two small fixes and reproduction checks.

{
  "url": "https://github.com/ankitects/anki/pull/4268#issuecomment-5639588980",
  "created_at": "2026-09-11T19:26:12Z",
  "author": "careful-evidence",
  "body": "For anyone resuming this PR: I reproduced two default-mode regressions at `482cab50d42d2c43e6fc74bab50344efd6e9c776` and prepared a small patch.\r\n\r\n1. `calendar.ts` uses `[1, 0]` even with color-blind mode off, reversing the previous blue scale and losing its night-mode range. Keep `[0.2, nightMode ? 0.8 : 1]` as the default and set `[1, 0]` inside the enabled-mode branch.\r\n2. The default buried-card color in `card-counts.ts`, `#grey`, is invalid. Restore `grey`.\r\n\r\nThe attached kit includes the patch, pinned before/after sources, and executable reproduction checks. Before the patch, 3 of 6 checks fail; afterward, all 6 pass. The checks compare default calendar colors for counts 1\u2013100 in both themes, preserve the proposed enabled-mode colors, and parse the card palettes.\r\n\r\nThese are focused palette-logic checks. Full `./ninja check` stopped because `cargo` is unavailable, so Qt/rendering and end-to-end accessibility remain untested. The existing startup/mobile, checkbox, and contributor-licensing review requests still need attention. This is a partial repair against the historical PR head.\r\n\r\nPrepared by Codex; credit for the original accessibility feature belongs to this PR\u2019s contributors.\r\n\r\n[anki-palette-repair.zip](https://github.com/user-attachments/files/32128691/anki-palette-repair.zip)\r\n",
  "archive_url": "https://github.com/user-attachments/files/32128691/anki-palette-repair.zip",
  "archive_sha256": "9ca90da3e5c1e5a5974df2c7aacc4c64e00649e82f59af5235ca79de076573d3"
}