doodle-mini/miniprogram/mathPages/shared/service/missingNumberDraw.ts

/**
 * 填上缺少的数字绘制服务
 */

import { BaseDrawService } from '../../../core/draw/baseDraw';

/**
 * 填上缺少的数字数据
 */
export interface MissingNumberData {
    grids: Array<{
        numbers: (number | null)[];
        colors: (string | null)[];
    }>;
    maxNumber: number;
}

/**
 * 填上缺少的数字绘制服务
 */
class MissingNumberDraw extends BaseDrawService {
    missingNumberData: MissingNumberData | null = null;

    constructor(
        canvas: Canvas,
        ctx: RenderingContext,
        options?: Record<string, any>,
    ) {
        super(canvas, ctx, options);
        this.missingNumberData = null;
    }

    /**
     * 绘制填上缺少的数字内容
     */
    async draw(
        missingNumberData: MissingNumberData,
        rangeType: string = 'within-10',
    ) {
        if (!missingNumberData || !missingNumberData.grids) {
            return;
        }

        this.missingNumberData = missingNumberData;
        this.prepareDraw();
        await this.drawHeaderAndDivider();
        await this.drawContent({
            canvas: this.canvas,
            ctx: this.ctx,
            missingNumberData: this.missingNumberData,
            canvasWidth: this.canvasWidth,
            startY: this.currentY,
        });
    }

    /**
     * 绘制内容区域
     */
    private async drawContent(params: {
        canvas: WechatMiniprogram.Canvas;
        ctx: RenderingContext;
        missingNumberData: MissingNumberData;
        canvasWidth: number;
        startY: number;
    }): Promise<void> {
        const { ctx, missingNumberData, canvasWidth, startY } = params;
        const { grids, maxNumber } = missingNumberData;

        const gridMap = {
            10: {
                cellSize: 95,
                colsPerGrid: 5,
                fontSize: 50,
                gridSpacing: 40,
            },
            20: {
                cellSize: 80,
                colsPerGrid: 5,
                fontSize: 40,
                gridSpacing: 30,
            },
            40: {
                cellSize: 60,
                colsPerGrid: 8,
                fontSize: 35,
                gridSpacing: 30,
            },
            50: {
                cellSize: 52,
                colsPerGrid: 10,
                fontSize: 28,
                gridSpacing: 40,
            },
            80: {
                cellSize: 60,
                colsPerGrid: 8,
                fontSize: 30,
                gridSpacing: 30,
            },
            100: {
                cellSize: 52,
                colsPerGrid: 10,
                fontSize: 28,
                gridSpacing: 20,
            },
            120: {
                cellSize: 52,
                colsPerGrid: 10,
                fontSize: 28,
                gridSpacing: 20,
            },
        };

        // 计算网格布局参数
        const leftMargin = 40;
        const rightMargin = 40;
        const topMargin = 20;

        const config = gridMap[maxNumber as keyof typeof gridMap];
        const { cellSize, gridSpacing, colsPerGrid, fontSize } = config;

        const gridWidth = colsPerGrid * cellSize;

        // 计算网格的起始X位置（居中）
        const gridStartX =
            leftMargin +
            (canvasWidth - leftMargin - rightMargin - gridWidth) / 2;

        let currentY = startY + topMargin;

        // 绘制每个网格
        for (let gridIndex = 0; gridIndex < grids.length; gridIndex++) {
            const grid = grids[gridIndex];
            const gridX = gridStartX;

            // 根据实际数字数量计算需要的行数
            const rowsPerGrid = Math.ceil(grid.numbers.length / colsPerGrid);
            const gridHeight = rowsPerGrid * cellSize;
            const gridY = currentY;

            // 绘制每个单元格
            for (let index = 0; index < grid.numbers.length; index++) {
                const row = Math.floor(index / colsPerGrid);
                const col = index % colsPerGrid;

                const cellX = gridX + col * cellSize;
                const cellY = gridY + row * cellSize;

                // 绘制单元格边框
                ctx.strokeStyle = '#333';
                ctx.lineWidth = 1.5;
                ctx.strokeRect(cellX, cellY, cellSize, cellSize);

                // 绘制数字或空白
                const number = grid.numbers[index];
                const color = grid.colors[index];

                if (number !== null && color !== null) {
                    // 绘制数字（带颜色）
                    ctx.fillStyle = color;
                    ctx.font = `bold ${fontSize}px "Microsoft Yahei"`;
                    ctx.textAlign = 'center';
                    ctx.textBaseline = 'middle';
                    ctx.fillText(
                        String(number),
                        cellX + cellSize / 2,
                        cellY + cellSize / 2,
                    );
                }
                // 如果为null，则留空（用户填写）
            }

            // 更新下一个网格的Y位置
            currentY += gridHeight + gridSpacing;
        }
    }
}

export default MissingNumberDraw;