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{ Point, Scale } from '../../../dependents';\nimport { FilterCondition, EventPayload } from '../../../interface';\nimport { View, Event } from '../../../chart';\nimport Action from '../base';\nimport { isMask } from '../util';\n\n// 获取对应的 scale\nfunction getFilter(scale: Scale, dim: string, point1: Point, point2: Point): FilterCondition {\n let min = Math.min(point1[dim], point2[dim]);\n let max = Math.max(point1[dim], point2[dim]);\n const [rangeMin, rangeMax] = scale.range;\n // 约束值在 scale 的 range 之间\n if (min < rangeMin) {\n min = rangeMin;\n }\n if (max > rangeMax) {\n max = rangeMax;\n }\n // 范围大于整个 view 的范围，则返回 null\n if (min === rangeMax && max === rangeMax) {\n return null;\n }\n const minValue = scale.invert(min);\n const maxValue = scale.invert(max);\n if (scale.isCategory) {\n const minIndex = scale.values.indexOf(minValue);\n const maxIndex = scale.values.indexOf(maxValue);\n const arr = scale.values.slice(minIndex, maxIndex + 1);\n return (value) => {\n return arr.includes(value);\n };\n } else {\n return (value) => {\n return value >= minValue && value <= maxValue;\n };\n }\n}\n\n/** range-filter 只用于：brush-filter, brush-x-filter, brush-y-filter */\nenum EVENTS {\n FILTER = 'brush-filter-processing',\n RESET = 'brush-filter-reset',\n BEFORE_FILTER = 'brush-filter:beforefilter',\n AFTER_FILTER = 'brush-filter:afterfilter',\n BEFORE_RESET = 'brush-filter:beforereset',\n AFTER_RESET = 'brush-filter:afterreset',\n}\n\nexport { EVENTS as BRUSH_FILTER_EVENTS };\n\n/**\n * 范围过滤的 Action\n * @ignore\n */\nclass RangeFilter extends Action {\n /** 允许外部传入 dims */\n protected cfgFields: ['dims'];\n /**\n * 范围过滤生效的字段/维度，可以是 x, y\n */\n protected dims: string[] = ['x', 'y'];\n /** 起始点 */\n protected startPoint: Point = null;\n\n private isStarted: boolean = false;\n\n // x,y 是否生效\n private hasDim(dim: string) {\n return this.dims.includes(dim);\n }\n\n /**\n * 开始范围过滤，记录范围过滤的起点\n */\n public start() {\n const context = this.context;\n this.isStarted = true;\n this.startPoint = context.getCurrentPoint();\n }\n\n /**\n * 过滤，以开始的点和当前点对数据进行过滤\n */\n public filter() {\n let startPoint;\n let currentPoint;\n if (isMask(this.context)) {\n const maskShape = this.context.event.target;\n const bbox = maskShape.getCanvasBBox();\n startPoint = { x: bbox.x, y: bbox.y };\n currentPoint = { x: bbox.maxX, y: bbox.maxY };\n } else {\n if (!this.isStarted) {\n // 如果没有开始，则不执行过滤\n return;\n }\n startPoint = this.startPoint;\n currentPoint = this.context.getCurrentPoint();\n }\n if (Math.abs(startPoint.x - currentPoint.x) < 5 || Math.abs(startPoint.x - currentPoint.y) < 5) {\n // 距离过小也不生效\n return;\n }\n const { view, event } = this.context;\n const payload = { view, event, dims: this.dims };\n view.emit(EVENTS.BEFORE_FILTER, Event.fromData(view, EVENTS.BEFORE_FILTER, payload));\n\n const coord = view.getCoordinate();\n const normalCurrent = coord.invert(currentPoint);\n const normalStart = coord.invert(startPoint);\n // 设置 x 方向的 filter\n if (this.hasDim('x')) {\n const xScale = view.getXScale();\n const filter = getFilter(xScale, 'x', normalCurrent, normalStart);\n this.filterView(view, xScale.field, filter);\n }\n // 设置 y 方向的 filter\n if (this.hasDim('y')) {\n const yScale = view.getYScales()[0];\n const filter = getFilter(yScale, 'y', normalCurrent, normalStart);\n this.filterView(view, yScale.field, filter);\n }\n this.reRender(view, { source: EVENTS.FILTER });\n\n view.emit(EVENTS.AFTER_FILTER, Event.fromData(view, EVENTS.AFTER_FILTER, payload));\n }\n\n /**\n * 结束\n */\n public end() {\n this.isStarted = false;\n }\n\n /**\n * 取消同当前 Action 相关的过滤，指定的 x,y\n */\n public reset() {\n const view = this.context.view;\n view.emit(EVENTS.BEFORE_RESET, Event.fromData(view, EVENTS.BEFORE_RESET, {}));\n\n this.isStarted = false;\n if (this.hasDim('x')) {\n const xScale = view.getXScale();\n this.filterView(view, xScale.field, null); // 取消过滤\n }\n if (this.hasDim('y')) {\n // y 轴过滤仅取第一个 yScale\n const yScale = view.getYScales()[0];\n this.filterView(view, yScale.field, null); // 取消过滤\n }\n this.reRender(view, { source: EVENTS.RESET });\n\n view.emit(EVENTS.AFTER_RESET, Event.fromData(view, EVENTS.AFTER_RESET, {}));\n }\n\n /**\n * 对 view 进行过滤\n */\n protected filterView(view: View, field: string, filter: FilterCondition) {\n view.filter(field, filter);\n }\n\n /**\n * 重新渲染\n * @param view\n */\n protected reRender(view: View, payload?: EventPayload) {\n view.render(true, payload);\n }\n}\n\nexport default RangeFilter;\n"]} |