R524809
127 lines
3.7 KiB
TypeScript
127 lines
3.7 KiB
TypeScript
import { getImage } from '../../../utils/index';
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import { NUMBER_COLORS } from '../../../constants/colors';
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/**
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* 数字到英文单词的映射
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*/
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const NUMBER_WORDS: Record<number, string> = {
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1: 'one',
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2: 'two',
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3: 'three',
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4: 'four',
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5: 'five',
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6: 'six',
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7: 'seven',
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8: 'eight',
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9: 'nine',
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10: 'ten',
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};
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/**
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* 绘制预览区域的参数接口
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*/
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interface DrawNumberPreviewParams {
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canvas: WechatMiniprogram.Canvas;
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ctx: RenderingContext;
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selectedNumber: number;
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canvasWidth: number; // 逻辑像素宽度（已除以3）
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startY: number; // 起始Y坐标
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onDrawn?: (currentY: number) => void; // 绘制完成后的回调
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}
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/**
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* 绘制数字预览区域服务
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* 左侧：animal-number 图片
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* 右侧：两个框，第一个框是finger图片，第二个框是英文单词
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* 所有尺寸除以3
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*/
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export async function drawNumberPreview({
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canvas,
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ctx,
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selectedNumber,
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canvasWidth,
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startY,
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onDrawn,
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}: DrawNumberPreviewParams): Promise<void> {
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// 左侧 animal-number 图片位置
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const animalImageWidth = 360;
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const animalImageHeight = 236;
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const leftMargin = 35;
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const animalImageX = leftMargin;
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const animalImageY = startY + 10;
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// 加载并绘制 animal-number 图片
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try {
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const animalImagePath = `/mathPages/shared/assets/animal-number/animal-number-${selectedNumber}.png`;
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const animalImage = await getImage(canvas, animalImagePath);
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ctx.drawImage(
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animalImage,
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animalImageX,
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animalImageY,
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animalImageWidth,
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animalImageHeight,
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);
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} catch (error) {
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console.error('加载animal-number图片失败:', error);
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}
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// 右侧两个框的位置（逻辑像素，除以3）
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const boxWidth = 130;
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const boxHeight = 100;
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const rightMargin = 35;
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const boxSpacing = 30;
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const boxX = canvasWidth - rightMargin - boxWidth;
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// 第一个框：finger 图片
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const fingerBoxY = animalImageY;
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ctx.strokeStyle = '#000';
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ctx.lineWidth = 1;
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ctx.strokeRect(boxX, fingerBoxY, boxWidth, boxHeight);
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try {
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const fingerImagePath = `/mathPages/shared/assets/finger/finger-${selectedNumber}.png`;
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const fingerImage = await getImage(canvas, fingerImagePath);
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// 计算图片在框内的位置（居中显示）
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const imagePadding = 10;
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const imageWidth = boxWidth - imagePadding * 2;
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const imageHeight = boxHeight - imagePadding * 2;
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ctx.drawImage(
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fingerImage,
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boxX + imagePadding,
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fingerBoxY + imagePadding,
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imageWidth,
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imageHeight,
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);
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} catch (error) {
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console.error('加载finger图片失败:', error);
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}
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// 第二个框：英文单词
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const wordBoxY = fingerBoxY + boxHeight + boxSpacing;
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ctx.strokeRect(boxX, wordBoxY, boxWidth, boxHeight);
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// 绘制英文单词（字体大小除以3）
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const word = NUMBER_WORDS[selectedNumber] || '';
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const color = NUMBER_COLORS[selectedNumber] || '#000';
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ctx.fillStyle = color;
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// 推荐使用系统内常见的圆体或幼圆体字体，更适合儿童视觉风格
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ctx.font =
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'bold 32px "HarmonyOS Sans", "PingFang SC", "YouYuan", "Microsoft Yahei", sans-serif';
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ctx.textAlign = 'center';
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ctx.textBaseline = 'middle';
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ctx.fillText(
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word,
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boxX + boxWidth / 2,
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wordBoxY + boxHeight / 2,
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boxWidth - 20,
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);
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// 更新 currentY 为预览区域底部
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const finalY =
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Math.max(animalImageY + animalImageHeight, wordBoxY + boxHeight) + 10;
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if (onDrawn) {
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onDrawn(finalY);
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}
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}
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