| 1 | 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中，我们会将数据通过图形语法映射成不同的图形，比如点图，数据集中的每条数据会对应一个点，柱状图每条数据对应一个柱子，线图则是一组数据对应一条折线，Element 即一条/一组数据对应的图形元素，它代表一条数据或者一个数据集，在图形层面，它可以是单个 Shape 也可以是多个 Shape，我们称之为图形元素。\n */\nexport default class Element extends Base {\n /** 用于创建各种 shape 的工厂对象 */\n public shapeFactory: ShapeFactory;\n /** shape 容器 */\n public container: IGroup;\n /** element 索引 */\n public elementIndex: number;\n /** 最后创建的图形对象 */\n public shape: IShape | IGroup;\n /** shape 的动画配置 */\n public animate: AnimateOption | boolean;\n\n // 非构造函数属性，需要外部赋值\n /** element 对应的 Geometry 实例 */\n public geometry: Geometry;\n /** 保存 shape 对应的 label */\n public labelShape: IGroup[] = [];\n\n /** 绘制的 shape 类型 */\n private shapeType: string;\n\n /** shape 绘制需要的数据 */\n private model: ShapeInfo;\n /** 原始数据 */\n private data: Datum;\n // 存储当前开启的状态\n private states: string[] = [];\n private statesStyle;\n // 虚拟 Group\n private offscreenGroup: IGroup;\n\n constructor(cfg: ElementCfg) {\n super(cfg);\n\n const { shapeFactory, container, offscreenGroup, 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undefined;\n this.offscreenGroup = undefined;\n this.statesStyle = undefined;\n\n super.destroy();\n }\n\n /**\n * 显示或者隐藏 element。\n * @param visible 是否可见。\n */\n public changeVisible(visible: boolean) {\n super.changeVisible(visible);\n\n if (visible) {\n if (this.shape) {\n this.shape.show();\n }\n if (this.labelShape) {\n this.labelShape.forEach((label: IGroup) => {\n label.show();\n });\n }\n } else {\n if (this.shape) {\n this.shape.hide();\n }\n if (this.labelShape) {\n this.labelShape.forEach((label: IGroup) => {\n label.hide();\n });\n }\n }\n }\n\n /**\n * 设置 Element 的状态。\n *\n * 目前 Element 开放三种状态：\n * 1. active\n * 2. selected\n * 3. inactive\n *\n * 这三种状态相互独立，可以进行叠加。\n *\n * 这三种状态的样式可在 [[Theme]] 主题中或者通过 `geometry.state()` 接口进行配置。\n *\n * ```ts\n * // 激活 active 状态\n * setState('active', true);\n * ```\n *\n * @param stateName 状态名\n * @param stateStatus 是否开启状态\n */\n public setState(stateName: string, stateStatus: boolean) {\n const { states, shapeFactory, model, shape, shapeType } = this;\n\n const index = states.indexOf(stateName);\n if (stateStatus) {\n // 开启状态\n if (index > -1) {\n // 该状态已经开启，则返回\n return;\n }\n states.push(stateName);\n if (stateName === 'active' || stateName === 'selected') {\n shape?.toFront();\n }\n } else {\n if (index === -1) {\n // 关闭状态，但是状态未设置过\n return;\n }\n states.splice(index, 1);\n if (stateName === 'active' || stateName === 'selected') {\n const { sortZIndex, zIndexReversed } = this.geometry;\n const idx = zIndexReversed ? this.geometry.elements.length - this.elementIndex : this.elementIndex;\n sortZIndex ? shape.setZIndex(idx) : shape.set('zIndex', idx);\n }\n }\n\n // 使用虚拟 group 重新绘制 shape，然后对这个 shape 应用状态样式后，更新当前 shape。\n const offscreenShape = shapeFactory.drawShape(shapeType, model, this.getOffscreenGroup());\n if (states.length) {\n // 应用当前状态\n this.syncShapeStyle(shape, offscreenShape, states, null);\n } else {\n // 如果没有状态，则需要恢复至原始状态\n this.syncShapeStyle(shape, offscreenShape, ['reset'], null);\n }\n\n offscreenShape.remove(true); // 销毁，减少内存占用\n\n const eventObject = {\n state: stateName,\n stateStatus,\n element: this,\n target: this.container,\n };\n this.container.emit('statechange', eventObject);\n // @ts-ignore\n propagationDelegate(this.shape, 'statechange', eventObject);\n }\n\n /**\n * 清空状量态，恢复至初始状态。\n */\n public clearStates() {\n const states = this.states;\n\n each(states, (state) => {\n this.setState(state, false);\n });\n\n this.states = [];\n }\n\n /**\n * 查询当前 Element 上是否已设置 `stateName` 对应的状态。\n * @param stateName 状态名称。\n * @returns true 表示存在，false 表示不存在。\n */\n public hasState(stateName: string): boolean {\n return this.states.includes(stateName);\n }\n\n /**\n * 获取当前 Element 上所有的状态。\n * @returns 当前 Element 上所有的状态数组。\n */\n public getStates(): string[] {\n return this.states;\n }\n\n /**\n * 获取 Element 对应的原始数据。\n * @returns 原始数据。\n */\n public getData(): Datum {\n return this.data;\n }\n\n /**\n * 获取 Element 对应的图形绘制数据。\n * @returns 图形绘制数据。\n */\n public getModel(): ShapeInfo {\n return this.model;\n }\n\n /**\n * 返回 Element 元素整体的 bbox，包含文本及文本连线（有的话）。\n * @returns 整体包围盒。\n */\n public getBBox(): BBox {\n const { shape, labelShape } = this;\n let bbox = {\n x: 0,\n y: 0,\n minX: 0,\n minY: 0,\n maxX: 0,\n maxY: 0,\n width: 0,\n height: 0,\n };\n if (shape) {\n bbox = shape.getCanvasBBox();\n }\n if (labelShape) {\n labelShape.forEach((label: IGroup) => {\n const labelBBox = label.getCanvasBBox();\n bbox.x = Math.min(labelBBox.x, bbox.x);\n bbox.y = Math.min(labelBBox.y, bbox.y);\n bbox.minX = Math.min(labelBBox.minX, bbox.minX);\n bbox.minY = Math.min(labelBBox.minY, bbox.minY);\n bbox.maxX = Math.max(labelBBox.maxX, bbox.maxX);\n bbox.maxY = Math.max(labelBBox.maxY, bbox.maxY);\n });\n }\n\n bbox.width = bbox.maxX - bbox.minX;\n bbox.height = bbox.maxY - bbox.minY;\n\n return bbox;\n }\n\n private getStatesStyle() {\n if (!this.statesStyle) {\n const { shapeType, geometry, shapeFactory } = this;\n const stateOption = geometry.stateOption;\n const defaultShapeType = shapeFactory.defaultShapeType;\n const stateTheme = shapeFactory.theme[shapeType] || shapeFactory.theme[defaultShapeType];\n this.statesStyle = deepMix({}, stateTheme, stateOption);\n }\n\n return this.statesStyle;\n }\n\n // 从主题中获取对应状态量的样式\n private getStateStyle(stateName: string, shapeKey?: string): StateCfg {\n const statesStyle = this.getStatesStyle();\n const stateCfg = get(statesStyle, [stateName, 'style'], {});\n const shapeStyle = stateCfg[shapeKey] || stateCfg;\n if (isFunction(shapeStyle)) {\n return shapeStyle(this);\n }\n\n return shapeStyle;\n }\n\n // 获取动画配置\n private getAnimateCfg(animateType: string) {\n const animate = this.animate;\n if (animate) {\n const cfg = animate[animateType];\n\n if (cfg) {\n // 增加动画的回调函数，如果外部传入了，则先执行外部，然后发射 geometry 的 animate 事件\n return {\n ...cfg,\n callback: () => {\n isFunction(cfg.callback) && cfg.callback();\n this.geometry?.emit(GEOMETRY_LIFE_CIRCLE.AFTER_DRAW_ANIMATE);\n },\n };\n }\n return cfg;\n }\n\n return null;\n }\n\n // 绘制图形\n private drawShape(model: ShapeInfo, isUpdate: boolean = false) {\n const { shapeFactory, container, shapeType } = this;\n\n // 自定义 shape 有可能返回空 shape\n this.shape = shapeFactory.drawShape(shapeType, model, container);\n\n if (this.shape) {\n this.setShapeInfo(this.shape, model); // 存储绘图数据\n // @ts-ignore\n const name = this.shape.cfg.name;\n // 附加 element 的 name, name 现在支持数组了，很好用了\n if (!name) {\n // 这个地方如果用户添加了 name, 则附加 name ，否则就添加自己的 name\n // @ts-ignore\n this.shape.cfg.name = ['element', this.shapeFactory.geometryType];\n } else if (isString(name)) {\n // @ts-ignore\n this.shape.cfg.name = ['element', name];\n }\n // 执行入场动画\n const animateType = isUpdate ? 'enter' : 'appear';\n const animateCfg = this.getAnimateCfg(animateType);\n if (animateCfg) {\n // 开始执行动画的生命周期\n this.geometry?.emit(GEOMETRY_LIFE_CIRCLE.BEFORE_DRAW_ANIMATE);\n\n doAnimate(this.shape, animateCfg, {\n coordinate: shapeFactory.coordinate,\n toAttrs: {\n ...this.shape.attr(),\n },\n });\n }\n }\n }\n\n // 获取虚拟 Group\n private getOffscreenGroup() {\n if (!this.offscreenGroup) {\n const GroupCtor = this.container.getGroupBase(); // 获取分组的构造函数\n this.offscreenGroup = new GroupCtor({});\n }\n\n return this.offscreenGroup;\n }\n\n // 设置 shape 上需要携带的信息\n private setShapeInfo(shape: IShape | IGroup, data: ShapeInfo) {\n // @ts-ignore\n shape.cfg.origin = data;\n // @ts-ignore\n shape.cfg.element = this;\n if (shape.isGroup()) {\n const children = shape.get('children');\n children.forEach((child) => {\n this.setShapeInfo(child, data);\n });\n }\n }\n\n // 更新当前 shape 的样式\n private syncShapeStyle(\n sourceShape: IGroup | IShape,\n targetShape: IGroup | IShape,\n states: string[] = [],\n animateCfg,\n index: number = 0\n ) {\n if (!sourceShape || !targetShape) {\n return;\n }\n // 所有的 shape 都需要同步 clip\n const clip = sourceShape.get('clipShape');\n const newClip = targetShape.get('clipShape');\n\n this.syncShapeStyle(clip, newClip, states, animateCfg);\n\n if (sourceShape.isGroup()) {\n const children = sourceShape.get('children');\n const newChildren = targetShape.get('children');\n for (let i = 0; i < children.length; i++) {\n this.syncShapeStyle(children[i], newChildren[i], states, animateCfg, index + i);\n }\n } else {\n if (!isEmpty(states) && !isEqual(states, ['reset'])) {\n let name = sourceShape.get('name');\n if (isArray(name)) {\n // 会附加 element 的 name\n name = name[1];\n }\n\n each(states, (state) => {\n // background shape 不进行状态样式设置\n if (targetShape.get('name') !== BACKGROUND_SHAPE) {\n const style = this.getStateStyle(state, name || index); // 如果用户没有设置 name，则默认根据索引值\n targetShape.attr(style);\n }\n });\n }\n const newAttrs = getReplaceAttrs(sourceShape as IShape, targetShape as IShape);\n\n if (this.animate) {\n if (animateCfg) {\n this.geometry?.emit(GEOMETRY_LIFE_CIRCLE.BEFORE_DRAW_ANIMATE);\n // 需要进行动画\n doAnimate(sourceShape, animateCfg, {\n coordinate: this.shapeFactory.coordinate,\n toAttrs: newAttrs,\n shapeModel: this.model,\n });\n } else if (!isEmpty(states)) {\n sourceShape.stopAnimate();\n sourceShape.animate(newAttrs, {\n duration: 300,\n });\n } else {\n sourceShape.attr(newAttrs);\n }\n } else {\n sourceShape.attr(newAttrs);\n }\n }\n }\n\n private getShapeType(model: ShapeInfo) {\n const shape = get(model, 'shape');\n return isArray(shape) ? shape[0] : shape;\n }\n}\n"]} |