R524809
126 lines
3.7 KiB
TypeScript
126 lines
3.7 KiB
TypeScript
import { BaseDrawService } from '../../../core/draw/baseDraw';
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import type {
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LetterTracingData,
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TripleSection,
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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 '../../shared/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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loadLetterFont,
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type LetterFontSizes,
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} from '../../shared/draw/drawTools';
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// 每行按 7 个位置预留空间，当前字母绘制占用其中前几组
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const SLOTS_PER_ROW = 7;
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// 大小写字母配对间的间隔（px，字母间距）
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const PAIR_GAP = 25;
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// 同一字母区域内相邻两行四线三格之间的间距（px）
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const TRIPLE_ROW_GAP = 10;
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// 相邻两个字母区域之间的间距（px），大于 TRIPLE_ROW_GAP
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const TRIPLE_SECTION_GAP = 20;
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type TripleData = Extract<LetterTracingData, { mode: 'letter-tracing-three' }>;
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/**
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* 三字母精练绘制：
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* 3 个字母区域，每区域 4 行四线三格。
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* 前两行展示完整颜色递进（黑→浅红→半透明浅红→虚线），
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* 后两行只展示黑色+浅红色两组，其余空白供用户书写。
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* 区域之间间距大于行间距。
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*/
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export default class TripleDraw 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: TripleData) {
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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.sections);
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this.drawPrintFooter();
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}
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private drawContent(sections: TripleSection[]) {
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const M = 24;
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const lineW = this.canvasWidth - M * 2;
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const slotW = lineW / SLOTS_PER_ROW;
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let y = this.currentY + 10;
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for (let s = 0; s < sections.length; s++) {
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const section = sections[s];
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for (let r = 0; r < section.rows.length; r++) {
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drawFourLineGrid(this.ctx, M, y, lineW, FOUR_LINE_GRID_H);
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this.drawRow(section.rows[r], M, y, slotW);
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y += FOUR_LINE_GRID_H;
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if (r < section.rows.length - 1) {
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y += TRIPLE_ROW_GAP;
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}
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}
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if (s < sections.length - 1) {
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y += TRIPLE_SECTION_GAP;
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}
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}
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}
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private drawRow(
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row: SingleLineRow,
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marginX: number,
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y: number,
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slotW: number,
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) {
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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 = marginX + 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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