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feat: 绘制基础类重构

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R524809
2026-04-10 15:06:11 +08:00
parent a911da6181
commit e74fd3709c
17 changed files with 1091 additions and 278 deletions
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miniprogram/core/draw/backup/baseDraw.ts
+531
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@@ -0,0 +1,531 @@
import { PAPER_SIZE } from '../../constants/colors';
import { drawBaseHeader, drawBaseMiniHeader } from './baseHeaderDraw';
/**
* 基础绘制服务
* 包含Paper设置和Header绘制功能，可被所有绘制服务复用
*
* 提供功能：
* - Canvas 初始化和配置
* - Paper 尺寸设置（支持 A4 等标准尺寸）
* - Header 绘制（支持完整 Header 和迷你 Header）
* - 分割线绘制
* - 打印配置管理
*/
export class BaseDrawService {
headerType: PrintHeader = 'wechat';
canvas: WechatMiniprogram.Canvas;
ctx: RenderingContext;
options: Record<string, any>;
paperSize: PaperSize;
currentX: number;
currentY: number;
canvasWidth: number; // 逻辑像素宽度
canvasHeight: number; // 逻辑像素高度
constructor(
canvas: Canvas,
ctx: RenderingContext,
options?: Record<string, any>,
) {
options = options || {};
const { appName, appHint } = getApp().getPrintConfig();
this.canvas = canvas;
this.ctx = ctx;
this.paperSize = 'A4';
this.options = {
appName,
appHint,
title: '看数字，涂一涂',
subTitle: '找一找下面相同的数字，涂上颜色',
...options,
};
this.currentX = 0;
this.currentY = 0;
this.canvasWidth = 0;
this.canvasHeight = 0;
this.setPrintConfig();
}
setPrintConfig() {
const printConfig = getApp().getPrintConfig();
this.headerType = printConfig.header;
this.options.appName = printConfig.appName;
}
/**
* 设置Paper（逻辑像素，尺寸除以3）
*/
setPaper() {
const { ctx, canvas } = this;
const { pixelRatio: dpr } = wx.getWindowInfo();
let { width, height } = PAPER_SIZE[this.paperSize];
this.canvasWidth = width;
this.canvasHeight = height;
// 设置 canvas 为物理像素尺寸（用于高分辨率显示）
const physicalWidth = width * dpr;
const physicalHeight = height * dpr;
canvas.width = physicalWidth;
canvas.height = physicalHeight;
// 重置 transform 并 scale 到逻辑像素
ctx.setTransform(1, 0, 0, 1, 0, 0); // 重置 transform
ctx.scale(dpr, dpr); // scale 到逻辑像素，后续绘制都使用逻辑像素
this.clear();
ctx.fillStyle = '#fff';
// 使用逻辑像素尺寸填充
ctx.fillRect(0, 0, this.canvasWidth, this.canvasHeight);
}
/**
* 清除画布
*/
clear() {
const canvas = this.canvas;
this.ctx.clearRect(0, 0, canvas.width, canvas.height);
}
/**
* 绘制Header（逻辑像素，尺寸除以3）
*/
async drawHeader() {
this.currentX = 25;
this.currentY = 25;
await drawBaseHeader({
canvas: this.canvas,
ctx: this.ctx,
headerType: this.headerType,
options: {
appName: this.options.appName || '涂鸦丫小程序',
appHint: this.options.appHint || '识字|识图|练字|打印',
title: this.options.title || '看数字，涂一涂',
subTitle:
this.options.subTitle || '找一找下面相同的数字，涂上颜色',
},
onHeaderDrawn: (currentY) => {
this.currentY = currentY;
},
});
}
/**
* 绘制迷你Header（逻辑像素，尺寸除以3）
*/
drawMiniHeader() {
drawBaseMiniHeader({
ctx: this.ctx,
canvasWidth: this.canvasWidth,
options: {
appName: this.options.appName || '涂鸦丫小程序',
title: this.options.title || '看数字，涂一涂',
},
onHeaderDrawn: (currentY) => {
console.log('drawMiniHeader currentY', currentY);
this.currentY = currentY;
},
});
}
/**
* 绘制分割线（逻辑像素，尺寸除以3）
*/
drawDivider() {
const { ctx, canvasWidth } = this;
const dividerY = this.currentY;
ctx.strokeStyle = '#000';
ctx.lineWidth = 1;
ctx.beginPath();
ctx.moveTo(24, dividerY);
ctx.lineTo(canvasWidth - 24, dividerY);
ctx.stroke();
this.currentY = dividerY + 10; // 分割线下方10px间距
}
/**
* 绘制虚线分割线（逻辑像素，尺寸除以3）
* @param y 分割线的Y坐标
* @param margin 左右边距，默认为40
* @param color 线条颜色，默认为'#999'
* @param lineWidth 线条宽度，默认为1
*/
drawDashedDivider(
y: number,
margin: number = 40,
color: string = '#999',
lineWidth: number = 1,
) {
const { ctx, canvasWidth } = this;
ctx.strokeStyle = color;
ctx.lineWidth = lineWidth;
ctx.setLineDash([4, 4]); // 虚线
ctx.beginPath();
ctx.moveTo(margin, y);
ctx.lineTo(canvasWidth - margin, y);
ctx.stroke();
ctx.setLineDash([]); // 重置为实线
}
/**
* 绘制线条（逻辑像素，尺寸除以3）
* @param x1 起点X坐标
* @param y1 起点Y坐标
* @param x2 终点X坐标
* @param y2 终点Y坐标
* @param options 可选参数
* @param options.isDashed 是否为虚线，默认为true（虚线）
* @param options.dashPattern 虚线模式，默认为[4, 4]
* @param options.color 线条颜色，默认为'#999'
* @param options.lineWidth 线条宽度，默认为1
*/
drawLine(
x1: number,
y1: number,
x2: number,
y2: number,
options?: {
isDashed?: boolean;
dashPattern?: number[];
color?: string;
lineWidth?: number;
},
): void {
const { ctx } = this;
const {
isDashed = true,
dashPattern = [4, 4],
color = '#999',
lineWidth = 1,
} = options || {};
ctx.strokeStyle = color;
ctx.lineWidth = lineWidth;
// 设置虚线或实线
if (isDashed) {
ctx.setLineDash(dashPattern);
} else {
ctx.setLineDash([]);
}
// 绘制线条
ctx.beginPath();
ctx.moveTo(x1, y1);
ctx.lineTo(x2, y2);
ctx.stroke();
// 重置为实线（避免影响后续绘制）
ctx.setLineDash([]);
}
/**
* 绘制网格线（逻辑像素，尺寸除以3）
* @param gridStartX 网格起始X坐标
* @param gridStartY 网格起始Y坐标
* @param cellWidth 每个格子的宽度
* @param cellHeight 每个格子的高度
* @param cols 列数
* @param rows 行数
*/
drawGridLines(
gridStartX: number,
gridStartY: number,
cellWidth: number,
cellHeight: number,
cols: number,
rows: number,
): void {
const { ctx } = this;
// 在函数内部计算网格总宽度和高度
const gridWidth = cellWidth * cols;
const gridHeight = cellHeight * rows;
ctx.strokeStyle = '#000';
ctx.lineWidth = 1;
ctx.setLineDash([]); // 实线
// 绘制垂直线
for (let i = 0; i <= cols; i++) {
const x = gridStartX + i * cellWidth;
ctx.beginPath();
ctx.moveTo(x, gridStartY);
ctx.lineTo(x, gridStartY + gridHeight);
ctx.stroke();
}
// 绘制水平线
for (let i = 0; i <= rows; i++) {
const y = gridStartY + i * cellHeight;
ctx.beginPath();
ctx.moveTo(gridStartX, y);
ctx.lineTo(gridStartX + gridWidth, y);
ctx.stroke();
}
}
/**
* 绘制圆角矩形框（逻辑像素，尺寸除以3）
* @param x 框的X坐标
* @param y 框的Y坐标
* @param width 框的宽度
* @param height 框的高度
* @param options 可选参数
* @param options.isDashed 是否为虚线，默认为false（实线）
* @param options.radius 圆角半径，默认为10
* @param options.color 线条颜色，默认为'#000'
* @param options.lineWidth 线条宽度，默认为1
*/
drawRoundedRect(
x: number,
y: number,
width: number,
height: number,
options?: {
isDashed?: boolean;
radius?: number;
color?: string;
lineWidth?: number;
},
): void {
const { ctx } = this;
const {
isDashed = false,
radius = 10,
color = '#000',
lineWidth = 1,
} = options || {};
ctx.strokeStyle = color;
ctx.lineWidth = lineWidth;
// 设置虚线或实线
if (isDashed) {
ctx.setLineDash([4, 4]); // 虚线
} else {
ctx.setLineDash([]); // 实线
}
// 绘制圆角矩形
ctx.beginPath();
ctx.moveTo(x + radius, y);
ctx.lineTo(x + width - radius, y);
ctx.quadraticCurveTo(x + width, y, x + width, y + radius);
ctx.lineTo(x + width, y + height - radius);
ctx.quadraticCurveTo(
x + width,
y + height,
x + width - radius,
y + height,
);
ctx.lineTo(x + radius, y + height);
ctx.quadraticCurveTo(x, y + height, x, y + height - radius);
ctx.lineTo(x, y + radius);
ctx.quadraticCurveTo(x, y, x + radius, y);
ctx.closePath();
ctx.stroke();
// 重置为实线（避免影响后续绘制）
ctx.setLineDash([]);
}
/**
* 绘制符号（使用路径绘制）
* @param x 符号中心X坐标
* @param y 符号中心Y坐标
* @param symbol 符号类型：'+', '-', '=', '×', '✓'
* @param size 符号大小
*/
drawSymbol(x: number, y: number, symbol: string, size: number): void {
const { ctx } = this;
ctx.save();
ctx.translate(x, y);
const lineWidth = size * 0.15; // 线条宽度
const halfSize = size / 2;
const strokeLength = halfSize * 0.7; // 线条长度
ctx.strokeStyle = '#000';
ctx.lineWidth = lineWidth;
ctx.lineCap = 'round';
ctx.lineJoin = 'round';
switch (symbol) {
case '+':
// 加号：横线和竖线
ctx.beginPath();
// 横线
ctx.moveTo(-strokeLength, 0);
ctx.lineTo(strokeLength, 0);
// 竖线
ctx.moveTo(0, -strokeLength);
ctx.lineTo(0, strokeLength);
ctx.stroke();
break;
case '-':
// 减号：横线
ctx.beginPath();
ctx.moveTo(-strokeLength, 0);
ctx.lineTo(strokeLength, 0);
ctx.stroke();
break;
case '=':
// 等号：两条横线
const equalsSpacing = size * 0.15; // 两条线之间的间距
ctx.beginPath();
// 上横线
ctx.moveTo(-strokeLength, -equalsSpacing);
ctx.lineTo(strokeLength, -equalsSpacing);
// 下横线
ctx.moveTo(-strokeLength, equalsSpacing);
ctx.lineTo(strokeLength, equalsSpacing);
ctx.stroke();
break;
case '×':
// 乘号：两条斜线
ctx.beginPath();
// 左上到右下
ctx.moveTo(-strokeLength * 0.7, -strokeLength * 0.7);
ctx.lineTo(strokeLength * 0.7, strokeLength * 0.7);
// 右上到左下
ctx.moveTo(strokeLength * 0.7, -strokeLength * 0.7);
ctx.lineTo(-strokeLength * 0.7, strokeLength * 0.7);
ctx.stroke();
break;
case '✓':
// 对号：勾，整体更大，右侧的线更长
const checkScale = 1.2; // 对号整体放大1.2倍
ctx.beginPath();
const checkStartX = -strokeLength * 0.5 * checkScale;
const checkStartY = -strokeLength * 0.2 * checkScale;
const checkMidX = -strokeLength * 0.1 * checkScale;
const checkMidY = strokeLength * 0.3 * checkScale;
const checkEndX = strokeLength * 1.0 * checkScale; // 增加右侧长度
const checkEndY = -strokeLength * 0.4 * checkScale; // 稍微向上调整
ctx.moveTo(checkStartX, checkStartY);
ctx.lineTo(checkMidX, checkMidY);
ctx.lineTo(checkEndX, checkEndY);
ctx.stroke();
break;
default:
// 默认绘制加号
ctx.beginPath();
ctx.moveTo(-strokeLength, 0);
ctx.lineTo(strokeLength, 0);
ctx.moveTo(0, -strokeLength);
ctx.lineTo(0, strokeLength);
ctx.stroke();
}
ctx.restore();
}
/**
* 绘制圆点
* @param ctx 绘制上下文
* @param x 圆点中心X坐标
* @param y 圆点中心Y坐标
* @param radius 圆点半径
* @param fillColor 填充颜色，默认为 '#93D333'
* @param strokeColor 边线颜色，如果传入则绘制边线，宽度为1，默认不绘制
*/
drawDot(
ctx: RenderingContext,
x: number,
y: number,
radius: number,
fillColor?: string,
strokeColor?: string,
) {
ctx.beginPath();
ctx.arc(x, y, radius, 0, Math.PI * 2);
// 绘制填充
ctx.fillStyle = fillColor ?? '#93D333';
ctx.fill();
// 绘制边线（如果提供了边线颜色）
if (strokeColor) {
ctx.strokeStyle = strokeColor;
ctx.lineWidth = 1;
ctx.stroke();
}
}
/**
* 准备绘制（公共初始化逻辑）
* 执行：setPrintConfig -> clear -> setPaper
* 子类可以在调用此方法前后执行自定义逻辑（如数据验证、异步资源加载等）
*/
prepareDraw() {
this.setPrintConfig();
this.clear();
this.setPaper();
}
/**
* 绘制 Header 和 Divider（公共绘制逻辑）
* 根据 headerType 自动选择绘制完整 Header 或迷你 Header，然后绘制分割线
*/
async drawHeaderAndDivider() {
// 绘制Header
if (this.headerType !== 'minimal') {
await this.drawHeader();
} else {
this.drawMiniHeader();
}
// 绘制内容区域分割线
this.drawDivider();
}
/**
* 绘制空白方框（边框1px，#999，无填充，不显示数字）
*/
drawBox(
ctx: RenderingContext,
x: number,
y: number,
width: number,
height: number,
color: string = '#999',
lineWidth: number = 1,
) {
// 绘制方框边框（1px，#999，无填充）
ctx.strokeStyle = color;
ctx.lineWidth = lineWidth;
ctx.setLineDash([]);
ctx.strokeRect(x, y, width, height);
}
/**
* 绘制正方形方框（调用drawBox，减少参数）
* @param ctx 渲染上下文
* @param x 方框左上角x
* @param y 方框左上角y
* @param size 方框边长
* @param color 边框颜色（可选，默认为#999）
* @param lineWidth 线宽（可选，默认为1）
*/
drawSquareBox(
ctx: RenderingContext,
x: number,
y: number,
size: number,
color: string = '#999',
lineWidth: number = 1,
) {
this.drawBox(ctx, x, y, size, size, color, lineWidth);
}
}
miniprogram/core/draw/baseHeaderDraw.ts → miniprogram/core/draw/backup/baseHeaderDraw.ts
View File
miniprogram/core/draw/baseDraw.ts
+79 -40
View File
@@ -1,5 +1,6 @@
import { PAPER_SIZE } from '../../constants/colors';
import { drawBaseHeader, drawBaseMiniHeader } from './baseHeaderDraw';
import { getImage } from '../../utils/index';
import drawHeader from './drawHeader';
/**
* 基础绘制服务
@@ -8,12 +9,14 @@ import { drawBaseHeader, drawBaseMiniHeader } from './baseHeaderDraw';
* 提供功能：
* - Canvas 初始化和配置
* - Paper 尺寸设置（支持 A4 等标准尺寸）
* - Header 绘制（支持完整 Header 和迷你 Header）
* - Header 绘制（统一打印纸页眉）
* - 分割线绘制
* - 打印配置管理
*/
const LINE_COLOR = 'rgba(50, 46, 37, 0.4)';
const LINE_WIDTH = 3;
export class BaseDrawService {
headerType: PrintHeader = 'wechat';
canvas: WechatMiniprogram.Canvas;
ctx: RenderingContext;
options: Record<string, any>;
@@ -22,6 +25,8 @@ export class BaseDrawService {
currentY: number;
canvasWidth: number; // 逻辑像素宽度
canvasHeight: number; // 逻辑像素高度
/** 紧跟在 drawHeader 之后的第一次 drawDivider 不画线（页眉已含底部分割线） */
private _suppressNextDividerLine = false;
constructor(
canvas: Canvas,
@@ -37,20 +42,18 @@ export class BaseDrawService {
appName,
appHint,
title: '看数字，涂一涂',
subTitle: '找一找下面相同的数字，涂上颜色',
...options,
};
this.currentX = 0;
this.currentY = 0;
this.canvasWidth = 0;
this.canvasHeight = 0;
this._suppressNextDividerLine = false;
this.setPrintConfig();
}
setPrintConfig() {
const printConfig = getApp().getPrintConfig();
this.headerType = printConfig.header;
this.options.appName = printConfig.appName;
}
@@ -93,51 +96,95 @@ export class BaseDrawService {
* 绘制Header（逻辑像素，尺寸除以3）
*/
async drawHeader() {
this.currentX = 25;
this.currentY = 25;
await drawBaseHeader({
this.currentX = 24;
this.currentY = 14;
await drawHeader({
canvas: this.canvas,
ctx: this.ctx,
headerType: this.headerType,
canvasWidth: this.canvasWidth,
options: {
appName: this.options.appName || '涂鸦丫小程序',
appHint: this.options.appHint || '识字|识图|练字|打印',
title: this.options.title || '看数字，涂一涂',
subTitle:
this.options.subTitle || '找一找下面相同的数字，涂上颜色',
},
onHeaderDrawn: (currentY) => {
onHeaderDrawn: (currentY: number) => {
this.currentY = currentY;
this._suppressNextDividerLine = true;
},
});
}
/**
* 绘制迷你Header（逻辑像素，尺寸除以3）
* 页脚：顶部分割线 + 居中 `doodle-footer.png`（小鸭与「涂鸦丫」品牌图）。
* 图片底边与纸张底边留白对齐，便于「探头」视觉。请在整页正文绘制完成后调用，避免被内容覆盖。
*/
drawMiniHeader() {
drawBaseMiniHeader({
ctx: this.ctx,
canvasWidth: this.canvasWidth,
options: {
appName: this.options.appName || '涂鸦丫小程序',
title: this.options.title || '看数字，涂一涂',
},
onHeaderDrawn: (currentY) => {
console.log('drawMiniHeader currentY', currentY);
this.currentY = currentY;
},
});
async drawPrintFooter(): Promise<void> {
const { ctx, canvasWidth, canvasHeight } = this;
const margin = 24;
const bottomMargin = 2;
const lineGapAboveImg = 10;
const maxImgW = canvasWidth - margin * 2;
const maxImgH = 40;
let dw = maxImgW;
let dh = maxImgH;
try {
const image = (await getImage(
this.canvas,
'/assets/imgs/doodle-footer.png',
)) as WechatMiniprogram.Image;
const nw = image.width || 2;
const nh = image.height || 1;
const aspect = nw / nh;
dh = Math.min(maxImgH, maxImgW / aspect);
dw = dh * aspect;
if (dw > maxImgW) {
dw = maxImgW;
dh = dw / aspect;
}
const imgX = (canvasWidth - dw) / 2;
const imgY = canvasHeight - bottomMargin - dh;
const lineY = imgY - lineGapAboveImg;
ctx.save();
ctx.strokeStyle = LINE_COLOR;
ctx.lineWidth = LINE_WIDTH;
ctx.lineCap = 'round';
ctx.beginPath();
ctx.moveTo(margin, lineY);
ctx.lineTo(canvasWidth - margin, lineY);
ctx.stroke();
ctx.restore();
ctx.drawImage(image, imgX, imgY, dw, dh);
} catch {
const lineY =
canvasHeight - bottomMargin - maxImgH - lineGapAboveImg;
ctx.save();
ctx.strokeStyle = LINE_COLOR;
ctx.lineWidth = LINE_WIDTH;
ctx.lineCap = 'round';
ctx.beginPath();
ctx.moveTo(margin, lineY);
ctx.lineTo(canvasWidth - margin, lineY);
ctx.stroke();
ctx.restore();
}
}
/**
* 绘制分割线（逻辑像素，尺寸除以3）
*/
drawDivider() {
if (this._suppressNextDividerLine) {
this._suppressNextDividerLine = false;
return;
}
const { ctx, canvasWidth } = this;
const dividerY = this.currentY;
ctx.strokeStyle = '#000';
ctx.strokeStyle = LINE_COLOR;
ctx.lineWidth = 1;
ctx.beginPath();
ctx.moveTo(24, dividerY);
@@ -475,18 +522,10 @@ export class BaseDrawService {
}
/**
* 绘制 Header 和 Divider（公共绘制逻辑）
* 根据 headerType 自动选择绘制完整 Header 或迷你 Header，然后绘制分割线
* 绘制统一页眉；紧随其后的 drawDivider 会跳过首条分割线（页眉已含底部灰线）。
*/
async drawHeaderAndDivider() {
// 绘制Header
if (this.headerType !== 'minimal') {
await this.drawHeader();
} else {
this.drawMiniHeader();
}
// 绘制内容区域分割线
await this.drawHeader();
this.drawDivider();
}
miniprogram/core/draw/drawHeader.ts
+111
View File
@@ -0,0 +1,111 @@
import { getMiniCodeImage } from '../../utils/index';
/**
* 统一打印纸页眉（与 UI 稿一致：左上 Logo、居中主标题、姓名/日期/得分、底部分割线）
*/
interface DrawBaseHeaderParams {
canvas: WechatMiniprogram.Canvas;
ctx: RenderingContext;
canvasWidth: number;
options: {
/** 练习纸主标题，如「数一数，连一连」 */
title: string;
};
onHeaderDrawn?: (currentY: number) => void;
}
const MARGIN_X = 24;
const LOGO_SIZE = 68;
const LOGO_X = MARGIN_X;
const LOGO_Y = 14;
const TITLE_FONT = 'bold 20px "Microsoft Yahei"';
const META_FONT = '14px "Microsoft Yahei"';
const META_FONT_PX = 12;
const META_UNDERLINE_GAP = 3;
const TITLE_COLOR = '#322E25';
const LINE_COLOR = 'rgba(50, 46, 37, 0.4)';
const LINE_WIDTH = 3;
const META_COLOR = '#7C766A';
const META_ROW_MARGIN_X = 130;
function drawMetaField(
ctx: RenderingContext,
label: string,
x: number,
y: number,
underlineRight: number,
) {
ctx.font = META_FONT;
ctx.fillStyle = META_COLOR;
ctx.textAlign = 'left';
ctx.textBaseline = 'top';
ctx.fillText(label, x, y);
const metrics = ctx.measureText(label);
const labelW = metrics.width;
// textBaseline=top 时 y 是字顶，不是垂直中心；下划线应从字底开始（约一行字高，与 META_FONT 字号一致）
const lineY = y + META_FONT_PX + META_UNDERLINE_GAP;
ctx.strokeStyle = '#E5DCC9';
ctx.lineWidth = 1;
ctx.beginPath();
ctx.moveTo(x + labelW + 2, lineY);
ctx.lineTo(Math.max(x + labelW + 2, underlineRight), lineY);
ctx.stroke();
}
export default async function drawHeader({
canvas,
ctx,
canvasWidth,
options,
onHeaderDrawn,
}: DrawBaseHeaderParams): Promise<void> {
const { title } = options;
const image = await getMiniCodeImage(canvas);
ctx.drawImage(image, LOGO_X, LOGO_Y, LOGO_SIZE, LOGO_SIZE);
ctx.font = TITLE_FONT;
ctx.fillStyle = TITLE_COLOR;
ctx.textAlign = 'center';
// top：y 为文本顶边；勿用 alphabetic，否则 y 是基线，大字会大量画在 y 上方导致裁出纸上沿
ctx.textBaseline = 'top';
const titleY = 22;
ctx.fillText(title, canvasWidth / 2, titleY);
const metaRowY = 65;
const innerLeft = META_ROW_MARGIN_X;
const innerRight = canvasWidth - META_ROW_MARGIN_X;
const innerW = innerRight - innerLeft;
const colW = innerW / 3;
drawMetaField(ctx, '姓名:', innerLeft + 4, metaRowY, innerLeft + colW - 8);
drawMetaField(
ctx,
'日期:',
innerLeft + colW + 4,
metaRowY,
innerLeft + 2 * colW - 8,
);
drawMetaField(
ctx,
'得分:',
innerLeft + 2 * colW + 4,
metaRowY,
innerRight - 4,
);
ctx.save();
const separatorY = 96;
ctx.strokeStyle = LINE_COLOR;
ctx.lineWidth = LINE_WIDTH;
ctx.lineCap = 'round';
ctx.beginPath();
ctx.moveTo(MARGIN_X, separatorY);
ctx.lineTo(canvasWidth - MARGIN_X, separatorY);
ctx.stroke();
ctx.restore();
const contentStartY = separatorY + 14;
if (onHeaderDrawn) {
onHeaderDrawn(contentStartY);
}
}