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@kanbun-skam/skam-canvas-renderer

v0.1.0

Published

SKAM to Canvas renderer - SKAMドキュメントからCanvas APIで描画

Readme

@kanbun-skam/skam-canvas-renderer

SKAM ドキュメントから Canvas API で描画するレンダラー。

画像エクスポートやサーバーサイドレンダリングに適した、3パスアーキテクチャの Canvas レンダラー。

インストール

npm install @kanbun-skam/skam-canvas-renderer
# or
pnpm add @kanbun-skam/skam-canvas-renderer

使い方

基本的なレンダリング

import { render } from '@kanbun-skam/skam-canvas-renderer';
import type { SKAMDocument } from '@kanbun-skam/skam';

const doc: SKAMDocument = {
  format: '[email protected]',
  tokens: [
    { id: 't1', text: '學' },
    { id: 't2', text: '而' },
  ],
  blocks: [{ id: 'b1', tokenIds: ['t1', 't2'] }],
  marks: [{ type: 'okurigana', anchor: { from: 't1', to: 't1' }, value: 'びて' }],
  readings: [],
};

const canvas = document.createElement('canvas');
render(doc, canvas, { fontSize: 24 });

サイズ計測

import { measure } from '@kanbun-skam/skam-canvas-renderer';

const ctx = canvas.getContext('2d')!;
const { width, height } = measure(doc, ctx, { fontSize: 24 });
canvas.width = width;
canvas.height = height;

表示プロファイル

import { render, PROFILES } from '@kanbun-skam/skam-canvas-renderer';

// フルプロファイル(すべての要素を表示、デフォルト)
render(doc, canvas, { profile: PROFILES.full });

// 学習用基本プロファイル(返り点のみ)
render(doc, canvas, { profile: PROFILES.learningBasic });

// 学習用ヒント付きプロファイル(返り点+送り仮名)
render(doc, canvas, { profile: PROFILES.learningHint });

フォントの読み込み

import { loadDefaultFont, DEFAULT_FONT_FAMILY } from '@kanbun-skam/skam-canvas-renderer';

// デフォルトフォント(Noto Serif JP)を読み込み
await loadDefaultFont();
render(doc, canvas, { fontFamily: DEFAULT_FONT_FAMILY, fontSize: 24 });

ブラウザバンドル

<script> タグで直接読み込み可能な IIFE バンドルも提供:

<script src="node_modules/@kanbun-skam/skam-canvas-renderer/dist/index.iife.js"></script>
<script>
  const { render, measure, PROFILES } = SkamCanvasRenderer;
</script>

レンダリング対応

全 13 種の SKAM v0.1 mark type をサポート:

| Mark Type | 対応状況 | | ----------- | -------- | | kaeri | ✅ | | okurigana | ✅ | | yomigana | ✅ | | soegana | ✅ | | okimoji | ✅ | | joji | ✅ | | kutoten | ✅ | | emphasis | ✅ | | saidoku | ✅ | | tateten | ✅ | | highlight | ✅ | | ref | ✅ | | okototen | ✅ |

内部アーキテクチャ

3パスパイプラインで描画:

  1. Pass 1 (render-tree): SKAMDocumentCanvasRenderTree (マーク解決・スロット割り当て)
  2. Pass 2 (layout): CanvasRenderTreeDocumentLayout (座標計算)
  3. Pass 3 (draw): DocumentLayout → Canvas API 描画

関連パッケージ

ライセンス

UNLICENSED