R524809
106 lines
3.2 KiB
TypeScript
106 lines
3.2 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 { drawFourLineGrid } from './drawTools';
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const LETTER_FACE =
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'Helvetica, Arial, "Segoe UI", Roboto, sans-serif';
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type ColumnCompareData = Extract<
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LetterTracingData,
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{ mode: 'column-compare' }
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>;
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export default class ColumnCompareDraw extends BaseDrawService {
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async draw(data: ColumnCompareData) {
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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 y0 = this.currentY + 6;
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const bottom = this.canvasHeight - M;
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const maxR = Math.max(leftRows.length, rightRows.length);
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const rowH = Math.max(36, (bottom - y0) / maxR - 6);
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const gapCol = 16;
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const colW = (this.canvasWidth - M * 2 - gapCol) / 2;
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for (let i = 0; i < leftRows.length; i++) {
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const y = y0 + i * (rowH + 6);
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this.drawTracingRow(leftRows[i], M, y, rowH, colW);
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}
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const xR = M + colW + gapCol;
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for (let i = 0; i < rightRows.length; i++) {
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const y = y0 + i * (rowH + 6);
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this.drawTracingRow(rightRows[i], xR, y, rowH, colW);
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}
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}
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private drawTracingRow(
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row: TracingRow,
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startX: number,
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y: number,
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rowH: number,
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totalWidth: number,
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) {
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const gap = 4;
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const n = row.cells.length;
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const cellW = n > 0 ? (totalWidth - gap * (n - 1)) / n : totalWidth;
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for (let i = 0; i < n; i++) {
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const cx = startX + i * (cellW + gap);
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drawFourLineGrid(this.ctx, cx, y, cellW, rowH);
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const cell = row.cells[i];
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this.drawCharInCell(
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cell.char,
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cx,
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y,
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cellW,
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rowH,
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cell.opacity,
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cell.isGuide,
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cell.pairChar,
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);
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}
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}
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private drawCharInCell(
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ch: string,
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x: number,
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y: number,
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w: number,
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h: number,
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opacity: number,
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bold: boolean,
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pairChar?: string,
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) {
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const ctx = this.ctx;
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if (opacity <= 0) return;
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ctx.save();
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ctx.globalAlpha = opacity;
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ctx.fillStyle = bold ? '#1a1a1a' : '#4a4a4a';
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ctx.textAlign = 'center';
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ctx.textBaseline = 'alphabetic';
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const baselineY = y + h * 0.72;
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if (pairChar) {
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const fs = Math.min(h * 0.5, w * 0.22);
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ctx.font = `${bold ? 'bold ' : ''}${fs}px ${LETTER_FACE}`;
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const gap = fs * 0.2;
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const totalW = fs * 2 + gap;
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const x0 = x + w / 2 - totalW / 2;
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ctx.fillText(ch, x0 + fs * 0.5, baselineY);
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ctx.fillText(pairChar, x0 + fs * 1.5 + gap, baselineY);
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} else {
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const fontSize = Math.min(h * 0.72, w * 0.85);
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ctx.font = `${bold ? 'bold ' : ''}${fontSize}px ${LETTER_FACE}`;
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ctx.fillText(ch, x + w / 2, baselineY);
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}
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ctx.restore();
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}
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}
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