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cacheScaleMeta.scale;\n const cacheScaleDef: LooseObject = {\n type: cacheScale.type,\n };\n if (cacheScale.isCategory) {\n // 如果是分类类型，保持 values\n cacheScaleDef.values = cacheScale.values;\n }\n finalScaleDef = deepMix(cacheScaleDef, cacheScaleMeta.scaleDef, scaleDef);\n }\n\n const scale = createScaleByField(field, data, finalScaleDef);\n\n // 缓存起来\n this.cacheScale(scale, scaleDef, key);\n\n return scale;\n }\n\n /**\n * 同步 scale\n */\n public sync() {\n // 对于 syncScales 中每一个 syncKey 下面的 scale 数组进行同步处理\n this.syncScales.forEach((scaleKeys: string[], syncKey: string) => {\n // min, max, values\n let min = Number.MAX_SAFE_INTEGER;\n let max = Number.MIN_SAFE_INTEGER;\n const values = [];\n\n // 1. 遍历求得最大最小值，values 等\n each(scaleKeys, (key: string) => {\n const scale = this.getScale(key);\n\n max = isNumber(scale.max) ? Math.max(max, scale.max) : max;\n min = isNumber(scale.min) ? Math.min(min, scale.min) : min;\n\n // 去重\n each(scale.values, (v: any) => {\n if (!values.includes(v)) {\n values.push(v);\n }\n });\n });\n\n // 2. 同步\n each(scaleKeys, (key: string) => {\n const scale = this.getScale(key);\n\n if (scale.isContinuous) {\n scale.change({\n min,\n max,\n values,\n });\n } else if (scale.isCategory) {\n scale.change({\n values,\n });\n }\n });\n });\n }\n\n /**\n * 缓存一个 scale\n * @param scale\n * @param scaleDef\n * @param key\n */\n private cacheScale(scale: Scale, scaleDef: ScaleOption, key: string) {\n // 1. 缓存到 scales\n\n let sm = this.getScaleMeta(key);\n // 存在则更新，同时检测类型是否一致\n if (sm && sm.scale.type === scale.type) {\n syncScale(sm.scale, scale);\n sm.scaleDef = scaleDef;\n // 更新 scaleDef\n } else {\n sm = {\n key,\n scale,\n scaleDef,\n };\n\n this.scales.set(key, sm);\n }\n\n // 2. 缓存到 syncScales，构造 Record<sync, string[]> 数据结构\n const syncKey = this.getSyncKey(sm);\n sm.syncKey = syncKey; // 设置 sync 同步的 key\n\n // 因为存在更新 scale 机制，所以在缓存之前，先从原 syncScales 中去除 sync 的缓存引用\n this.removeFromSyncScales(key);\n\n // 存在 sync 标记才进行 sync\n if (syncKey) {\n // 不存在这个 syncKey，则创建一个空数组\n let scaleKeys = this.syncScales.get(syncKey);\n if (!scaleKeys) {\n scaleKeys = []\n this.syncScales.set(syncKey, scaleKeys);\n }\n scaleKeys.push(key);\n }\n }\n\n /**\n * 通过 key 获取 scale\n * @param key\n */\n public getScale(key: string): Scale {\n let scaleMeta = this.getScaleMeta(key);\n if (!scaleMeta) {\n const field = last(key.split('-'));\n const scaleKeys = this.syncScales.get(field);\n if (scaleKeys && scaleKeys.length) {\n scaleMeta = this.getScaleMeta(scaleKeys[0]);\n }\n }\n return scaleMeta && scaleMeta.scale;\n }\n\n /**\n * 在 view 销毁的时候，删除 scale 实例，防止内存泄露\n * @param key\n */\n public deleteScale(key: string) {\n let scaleMeta = this.getScaleMeta(key);\n if (scaleMeta) {\n const { syncKey } = scaleMeta;\n\n const scaleKeys = this.syncScales.get(syncKey);\n\n // 移除同步的关系\n if (scaleKeys && scaleKeys.length) {\n const idx = scaleKeys.indexOf(key);\n\n if (idx !== -1) {\n scaleKeys.splice(idx, 1);\n }\n }\n }\n\n // 删除 scale 实例\n this.scales.delete(key);\n }\n\n /**\n * 清空\n */\n public clear() {\n this.scales.clear();\n this.syncScales.clear();\n }\n\n /**\n * 删除 sync scale 引用\n * @param key\n */\n private removeFromSyncScales(key: string) {\n this.syncScales.forEach((scaleKeys: string[], syncKey: string) => {\n const idx = scaleKeys.indexOf(key);\n\n if (idx !== -1) {\n scaleKeys.splice(idx, 1);\n\n // 删除空数组值\n if (scaleKeys.length === 0) {\n this.syncScales.delete(syncKey);\n }\n\n return false; // 跳出循环\n }\n });\n }\n\n /**\n * get sync key\n * @param sm\n */\n private getSyncKey(sm: ScaleMeta): string {\n const { scale, scaleDef } = sm;\n const { field } = scale;\n const sync = get(scaleDef, ['sync']);\n\n // 如果 sync = true，则直接使用字段名作为 syncKey\n return sync === true ? field : sync === false ? undefined : sync;\n }\n\n /**\n * 通过 key 获取 scale\n * @param key\n */\n private getScaleMeta(key: string): ScaleMeta {\n return this.scales.get(key);\n }\n}\n"]} |