R524809
125 lines
3.9 KiB
TypeScript
125 lines
3.9 KiB
TypeScript
import { BaseDrawService } from '../../../core/draw/baseDraw';
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import type {
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LetterTracingData,
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TracingRow,
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} from '../generators/letter-tracing-generator';
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import { fontFamilyOf } from '../data/fontProfiles';
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import {
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calcLetterFontSizes,
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drawFourLineGrid,
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drawLetterInFourLineGrid,
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FOUR_LINE_GRID_H,
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type LetterFontSizes,
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} from './drawTools';
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const COLOR_BLACK = '#1a1a1a';
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const COLOR_LIGHT_RED = '#FF8E8E';
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const COLUMN_GUTTER = 18;
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type TwoColumnData = Extract<
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LetterTracingData,
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{ mode: 'letter-tracing-two-column' }
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>;
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/**
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* 两列练习绘制：
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* 左栏 A–M（Aa Bb … Mm）、右栏 N–Z（Nn Oo … Zz），每栏 13 行。
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* 每行一个完整四线三格，格内绘制大小写配对字母。
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* 第一行黑色示范，后续行浅红色渐淡。两栏间距 18px。
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*/
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export default class TwoColumnDraw extends BaseDrawService {
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private letterSizes: LetterFontSizes =
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calcLetterFontSizes(FOUR_LINE_GRID_H);
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async draw(data: TwoColumnData) {
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this.prepareDraw();
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await this.drawHeaderAndDivider();
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this.drawContent(data.leftRows, data.rightRows);
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this.drawPrintFooter();
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}
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private drawContent(leftRows: TracingRow[], rightRows: TracingRow[]) {
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const M = 24;
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const lineW = this.canvasWidth - M * 2;
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const colW = (lineW - COLUMN_GUTTER) / 2;
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const maxR = Math.max(leftRows.length, rightRows.length);
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const footerReserve = 56;
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const availableH =
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this.canvasHeight - this.currentY - footerReserve - 12;
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const rowGap = Math.max(
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4,
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(availableH - maxR * FOUR_LINE_GRID_H) / (maxR + 1),
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);
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const y0 = this.currentY + rowGap;
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const leftX = M;
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const rightX = M + colW + COLUMN_GUTTER;
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for (let i = 0; i < maxR; i++) {
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const y = y0 + i * (FOUR_LINE_GRID_H + rowGap);
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if (i < leftRows.length) {
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drawFourLineGrid(this.ctx, leftX, y, colW, FOUR_LINE_GRID_H);
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this.drawPairRow(leftRows[i], leftX, y, colW);
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}
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if (i < rightRows.length) {
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drawFourLineGrid(this.ctx, rightX, y, colW, FOUR_LINE_GRID_H);
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this.drawPairRow(rightRows[i], rightX, y, colW);
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}
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}
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}
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/**
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* 在一个四线三格内绘制大小写配对（如 A a）。
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* rowIndex=0 黑色示范，>0 浅红色。
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* cells 里每个 cell 的 char 是大写、pairChar 是小写，
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* 按 repetitions 排列（第一个实色 → 后续渐淡）。
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*/
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private drawPairRow(row: TracingRow, x: number, y: number, colW: number) {
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const fontFamily = fontFamilyOf(this.letterSizes._profile);
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const cells = row.cells;
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const n = cells.length;
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if (n === 0) return;
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const pairCount = n;
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const slotW = colW / pairCount;
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const pairGap = 25;
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for (let i = 0; i < pairCount; i++) {
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const cell = cells[i];
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const color = i === 0 ? COLOR_BLACK : COLOR_LIGHT_RED;
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const alpha = i >= pairCount - 2 ? 0.5 : 1;
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const pairCx = x + i * slotW + slotW / 2;
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this.ctx.save();
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this.ctx.globalAlpha = alpha;
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drawLetterInFourLineGrid(
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this.ctx,
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cell.char,
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pairCx - pairGap / 2,
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y,
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FOUR_LINE_GRID_H,
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this.letterSizes,
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{ fontFamily, color },
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);
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if (cell.pairChar) {
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drawLetterInFourLineGrid(
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this.ctx,
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cell.pairChar,
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pairCx + pairGap / 2,
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y,
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FOUR_LINE_GRID_H,
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this.letterSizes,
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{ fontFamily, color },
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);
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}
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this.ctx.restore();
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}
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}
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}
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