R524809
113 lines
3.3 KiB
TypeScript
113 lines
3.3 KiB
TypeScript
import { BaseDrawService } from '../../../core/draw/baseDraw';
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import type {
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LetterTracingData,
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SingleLineRow,
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} from '../generators/letter-tracing-generator';
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import {
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fontFamilyOf,
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PRINT_CLEARLY_DASHED,
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} from '../../../core/font/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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loadLetterFont,
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type LetterFontSizes,
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} from '../../shared/draw/drawTools';
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const SLOTS_PER_ROW = 7;
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const PAIR_GAP = 25;
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type SingleLineData = Extract<
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LetterTracingData,
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{ mode: 'letter-tracing-half' }
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>;
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/**
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* 单字母逐行绘制：
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* 13 行四线三格横跨整页宽度，每行按 7 组位置预留空间。
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* 前 4 组展示大小写字母（Aa），其余位置留空供用户书写。
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* 颜色递进：黑色 → 浅红 → 半透明浅红 → 虚线字体+半透明浅红。
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*/
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export default class HalfLetterDraw extends BaseDrawService {
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private letterSizes: LetterFontSizes =
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calcLetterFontSizes(FOUR_LINE_GRID_H);
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private dashedSizes: LetterFontSizes = calcLetterFontSizes(
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FOUR_LINE_GRID_H,
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PRINT_CLEARLY_DASHED,
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);
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async draw(data: SingleLineData) {
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this.prepareDraw();
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await Promise.all([
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this.drawHeaderAndDivider(),
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loadLetterFont(PRINT_CLEARLY_DASHED),
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]);
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this.drawContent(data.rows);
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this.drawPrintFooter();
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}
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private drawContent(rows: SingleLineRow[]) {
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const M = 24;
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const lineW = this.canvasWidth - M * 2;
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const rowCount = rows.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 - rowCount * FOUR_LINE_GRID_H) / (rowCount + 1),
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);
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const y0 = this.currentY + rowGap;
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const slotW = lineW / SLOTS_PER_ROW;
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for (let i = 0; i < rowCount; i++) {
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const y = y0 + i * (FOUR_LINE_GRID_H + rowGap);
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drawFourLineGrid(this.ctx, M, y, lineW, FOUR_LINE_GRID_H);
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const row = rows[i];
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for (let j = 0; j < row.cells.length; j++) {
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const cell = row.cells[j];
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if (!cell) continue;
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const pairCx = M + j * slotW + slotW / 2;
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const isDashed = cell.style === 'dashed';
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const sizes = isDashed ? this.dashedSizes : this.letterSizes;
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const fontFamily = fontFamilyOf(
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isDashed ? PRINT_CLEARLY_DASHED : sizes._profile,
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);
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this.ctx.save();
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this.ctx.globalAlpha = cell.alpha;
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drawLetterInFourLineGrid(
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this.ctx,
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cell.upper,
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pairCx - PAIR_GAP / 2,
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y,
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FOUR_LINE_GRID_H,
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sizes,
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{ fontFamily, color: cell.color },
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);
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drawLetterInFourLineGrid(
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this.ctx,
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cell.lower,
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pairCx + PAIR_GAP / 2,
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y,
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FOUR_LINE_GRID_H,
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sizes,
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{ fontFamily, color: cell.color },
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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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}
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