Feat：新增竖向时间轴

simple-mind-map/src/constants/constant.js

@@ -170,7 +170,8 @@ export const CONSTANTS = {
     CATALOG_ORGANIZATION: 'catalogOrganization',
     TIMELINE: 'timeline',
     TIMELINE2: 'timeline2',
-    FISHBONE: 'fishbone'
+    FISHBONE: 'fishbone',
+    VERTICAL_TIMELINE: 'verticalTimeline'
   },
   DIR: {
     UP: 'up',
@@ -206,8 +207,10 @@ export const CONSTANTS = {
     BOTTOM: 'bottom',
     CENTER: 'center'
   },
-  TIMELINE_DIR: {
+  LAYOUT_GROW_DIR: {
+    LEFT: 'left',
     TOP: 'top',
+    RIGHT: 'right',
     BOTTOM: 'bottom'
   }
 }
@@ -246,6 +249,10 @@ export const layoutList = [
     name: '时间轴2',
     value: CONSTANTS.LAYOUT.TIMELINE2,
   },
+  {
+    name: '竖向时间轴',
+    value: CONSTANTS.LAYOUT.VERTICAL_TIMELINE,
+  },
   {
     name: '鱼骨图',
     value: CONSTANTS.LAYOUT.FISHBONE,
@@ -258,6 +265,7 @@ export const layoutValueList = [
   CONSTANTS.LAYOUT.ORGANIZATION_STRUCTURE,
   CONSTANTS.LAYOUT.TIMELINE,
   CONSTANTS.LAYOUT.TIMELINE2,
+  CONSTANTS.LAYOUT.VERTICAL_TIMELINE,
   CONSTANTS.LAYOUT.FISHBONE
 ]
 

simple-mind-map/src/core/render/Render.js

@@ -4,6 +4,7 @@ import MindMap from '../../layouts/MindMap'
 import CatalogOrganization from '../../layouts/CatalogOrganization'
 import OrganizationStructure from '../../layouts/OrganizationStructure'
 import Timeline from '../../layouts/Timeline'
+import VerticalTimeline from '../../layouts/VerticalTimeline'
 import Fishbone from '../../layouts/Fishbone'
 import TextEdit from './TextEdit'
 import { copyNodeTree, simpleDeepClone, walk } from '../../utils'
@@ -25,6 +26,8 @@ const layouts = {
   [CONSTANTS.LAYOUT.TIMELINE]: Timeline,
   // 时间轴2
   [CONSTANTS.LAYOUT.TIMELINE2]: Timeline,
+  // 竖向时间轴
+  [CONSTANTS.LAYOUT.VERTICAL_TIMELINE]: VerticalTimeline,
   // 鱼骨图
   [CONSTANTS.LAYOUT.FISHBONE]: Fishbone,
 }

simple-mind-map/src/layouts/Fishbone.js

@@ -51,8 +51,8 @@ class Fishbone extends Base {
             // 节点生长方向
             newNode.dir =
               index % 2 === 0
-                ? CONSTANTS.TIMELINE_DIR.TOP
+                ? CONSTANTS.LAYOUT_GROW_DIR.TOP
-                : CONSTANTS.TIMELINE_DIR.BOTTOM
+                : CONSTANTS.LAYOUT_GROW_DIR.BOTTOM
           }
           // 计算二级节点的top值
           if (parent._node.isRoot) {
@@ -222,7 +222,7 @@ class Fishbone extends Base {
 
   // 检查节点是否是上方节点
   checkIsTop(node) {
-    return node.dir === CONSTANTS.TIMELINE_DIR.TOP
+    return node.dir === CONSTANTS.LAYOUT_GROW_DIR.TOP
   }
 
   //  绘制连线，连接该节点到其子节点

simple-mind-map/src/layouts/FishboneBottom.js

@@ -52,8 +52,8 @@ class Fishbone extends Base {
             // 节点生长方向
             newNode.dir =
               index % 2 === 0
-                ? CONSTANTS.TIMELINE_DIR.TOP
+                ? CONSTANTS.LAYOUT_GROW_DIR.TOP
-                : CONSTANTS.TIMELINE_DIR.BOTTOM
+                : CONSTANTS.LAYOUT_GROW_DIR.BOTTOM
           }
           // 计算二级节点的top值
           if (parent._node.isRoot) {

simple-mind-map/src/layouts/FishboneTop.js

@@ -52,8 +52,8 @@ class Fishbone extends Base {
             // 节点生长方向
             newNode.dir =
               index % 2 === 0
-                ? CONSTANTS.TIMELINE_DIR.TOP
+                ? CONSTANTS.LAYOUT_GROW_DIR.TOP
-                : CONSTANTS.TIMELINE_DIR.BOTTOM
+                : CONSTANTS.LAYOUT_GROW_DIR.BOTTOM
           }
           // 计算二级节点的top值
           if (parent._node.isRoot) {
@@ -281,7 +281,7 @@ class Fishbone extends Base {
         if (
           node.parent &&
           node.parent.isRoot &&
-          node.dir === CONSTANTS.TIMELINE_DIR.TOP
+          node.dir === CONSTANTS.LAYOUT_GROW_DIR.TOP
         ) {
           line.plot(
             `M ${x},${top} L ${x + lineLength},${

simple-mind-map/src/layouts/MindMap.js

@@ -1,5 +1,6 @@
 import Base from './Base'
 import { walk, asyncRun } from '../utils'
+import { CONSTANTS } from '../constants/constant'
 
 //  思维导图
 class MindMap extends Base {
@@ -45,11 +46,11 @@ class MindMap extends Base {
             newNode.dir = parent._node.dir
           } else {
             // 节点生长方向
-            newNode.dir = index % 2 === 0 ? 'right' : 'left'
+            newNode.dir = index % 2 === 0 ? CONSTANTS.LAYOUT_GROW_DIR.RIGHT : CONSTANTS.LAYOUT_GROW_DIR.LEFT
           }
           // 根据生长方向定位到父节点的左侧或右侧
           newNode.left =
-            newNode.dir === 'right'
+            newNode.dir === CONSTANTS.LAYOUT_GROW_DIR.RIGHT
               ? parent._node.left +
                 parent._node.width +
                 this.getMarginX(layerIndex)
@@ -72,7 +73,7 @@ class MindMap extends Base {
         let leftChildrenAreaHeight = 0
         let rightChildrenAreaHeight = 0
         cur._node.children.forEach(item => {
-          if (item.dir === 'left') {
+          if (item.dir === CONSTANTS.LAYOUT_GROW_DIR.LEFT) {
             leftLen++
             leftChildrenAreaHeight += item.height
           } else {
@@ -109,7 +110,7 @@ class MindMap extends Base {
           let leftTotalTop = baseTop - node.leftChildrenAreaHeight / 2
           let rightTotalTop = baseTop - node.rightChildrenAreaHeight / 2
           node.children.forEach(cur => {
-            if (cur.dir === 'left') {
+            if (cur.dir === CONSTANTS.LAYOUT_GROW_DIR.LEFT) {
               cur.top = leftTotalTop
               leftTotalTop += cur.height + marginY
             } else {
@@ -162,7 +163,7 @@ class MindMap extends Base {
           return
         }
         let _offset = 0
-        let addHeight = item.dir === 'left' ? leftAddHeight : rightAddHeight
+        let addHeight = item.dir === CONSTANTS.LAYOUT_GROW_DIR.LEFT ? leftAddHeight : rightAddHeight
         // 上面的节点往上移
         if (_index < index) {
           _offset = -addHeight
@@ -211,7 +212,7 @@ class MindMap extends Base {
       let nodeUseLineStyleOffset = nodeUseLineStyle
         ? item.width
         : 0
-      if (item.dir === 'left') {
+      if (item.dir === CONSTANTS.LAYOUT_GROW_DIR.LEFT) {
         _s = -s1
         x1 = node.layerIndex === 0 ? left : left - expandBtnSize
         nodeUseLineStyleOffset = -nodeUseLineStyleOffset
@@ -220,7 +221,7 @@ class MindMap extends Base {
         x1 = node.layerIndex === 0 ? left + width : left + width + expandBtnSize
       }
       let y1 = top + height / 2
-      let x2 = item.dir === 'left' ? item.left + item.width : item.left
+      let x2 = item.dir === CONSTANTS.LAYOUT_GROW_DIR.LEFT ? item.left + item.width : item.left
       let y2 = item.top + item.height / 2
       y1 = nodeUseLineStyle && !node.isRoot ? y1 + height / 2 : y1
       y2 = nodeUseLineStyle ? y2 + item.height / 2 : y2
@@ -246,18 +247,18 @@ class MindMap extends Base {
       let x1 =
         node.layerIndex === 0
           ? left + width / 2
-          : item.dir === 'left'
+          : item.dir === CONSTANTS.LAYOUT_GROW_DIR.LEFT
           ? left - expandBtnSize
           : left + width + expandBtnSize
       let y1 = top + height / 2
-      let x2 = item.dir === 'left' ? item.left + item.width : item.left
+      let x2 = item.dir === CONSTANTS.LAYOUT_GROW_DIR.LEFT ? item.left + item.width : item.left
       let y2 = item.top + item.height / 2
       y1 = nodeUseLineStyle && !node.isRoot ? y1 + height / 2 : y1
       y2 = nodeUseLineStyle ? y2 + item.height / 2 : y2
       // 节点使用横线风格，需要额外渲染横线
       let nodeUseLineStylePath = ''
       if (nodeUseLineStyle) {
-        if (item.dir === 'left') {
+        if (item.dir === CONSTANTS.LAYOUT_GROW_DIR.LEFT) {
           nodeUseLineStylePath = ` L ${item.left},${y2}`
         } else {
           nodeUseLineStylePath = ` L ${item.left + item.width},${y2}`
@@ -283,11 +284,11 @@ class MindMap extends Base {
       let x1 =
         node.layerIndex === 0
           ? left + width / 2
-          : item.dir === 'left'
+          : item.dir === CONSTANTS.LAYOUT_GROW_DIR.LEFT
           ? left - expandBtnSize
           : left + width + expandBtnSize
       let y1 = top + height / 2
-      let x2 = item.dir === 'left' ? item.left + item.width : item.left
+      let x2 = item.dir === CONSTANTS.LAYOUT_GROW_DIR.LEFT ? item.left + item.width : item.left
       let y2 = item.top + item.height / 2
       let path = ''
       y1 = nodeUseLineStyle && !node.isRoot ? y1 + height / 2 : y1
@@ -295,7 +296,7 @@ class MindMap extends Base {
       // 节点使用横线风格，需要额外渲染横线
       let nodeUseLineStylePath = ''
       if (this.mindMap.themeConfig.nodeUseLineStyle) {
-        if (item.dir === 'left') {
+        if (item.dir === CONSTANTS.LAYOUT_GROW_DIR.LEFT) {
           nodeUseLineStylePath = ` L ${item.left},${y2}`
         } else {
           nodeUseLineStylePath = ` L ${item.left + item.width},${y2}`
@@ -320,7 +321,7 @@ class MindMap extends Base {
       ? height / 2
       : 0
     // 位置没有变化则返回
-    let _x = (node.dir === 'left' ? 0 - expandBtnSize : width)
+    let _x = (node.dir === CONSTANTS.LAYOUT_GROW_DIR.LEFT ? 0 - expandBtnSize : width)
     let _y = height / 2 + nodeUseLineStyleOffset
     if (_x === translateX && _y === translateY) {
       return
@@ -332,7 +333,7 @@ class MindMap extends Base {
 
   //  创建概要节点
   renderGeneralization(node, gLine, gNode) {
-    let isLeft = node.dir === 'left'
+    let isLeft = node.dir === CONSTANTS.LAYOUT_GROW_DIR.LEFT
     let {
       top,
       bottom,

simple-mind-map/src/layouts/Timeline.js

@@ -50,8 +50,8 @@ class Timeline extends Base {
               // 节点生长方向
               newNode.dir =
                 index % 2 === 0
-                  ? CONSTANTS.TIMELINE_DIR.BOTTOM
+                  ? CONSTANTS.LAYOUT_GROW_DIR.BOTTOM
-                  : CONSTANTS.TIMELINE_DIR.TOP
+                  : CONSTANTS.LAYOUT_GROW_DIR.TOP
             }
           } else {
             newNode.dir = ''
@@ -151,7 +151,7 @@ class Timeline extends Base {
         if (
           parent &&
           parent.isRoot &&
-          node.dir === CONSTANTS.TIMELINE_DIR.TOP
+          node.dir === CONSTANTS.LAYOUT_GROW_DIR.TOP
         ) {
           // 遍历二级节点的子节点
           node.children.forEach(item => {
@@ -280,7 +280,7 @@ class Timeline extends Base {
         if (
           node.parent &&
           node.parent.isRoot &&
-          node.dir === CONSTANTS.TIMELINE_DIR.TOP
+          node.dir === CONSTANTS.LAYOUT_GROW_DIR.TOP
         ) {
           line.plot(`M ${x},${top} L ${x},${miny}`)
         } else {
@@ -301,7 +301,7 @@ class Timeline extends Base {
       if (
         node.parent &&
         node.parent.isRoot &&
-        node.dir === CONSTANTS.TIMELINE_DIR.TOP
+        node.dir === CONSTANTS.LAYOUT_GROW_DIR.TOP
       ) {
         btn.translate(
           width * 0.3 - expandBtnSize / 2 - translateX,

simple-mind-map/src/layouts/VerticalTimeline.js

@@ -0,0 +1,413 @@
+import Base from './Base'
+import { walk, asyncRun } from '../utils'
+import { CONSTANTS } from '../constants/constant'
+
+//  竖向时间轴
+class VerticalTimeline extends Base {
+  //  构造函数
+  constructor(opt = {}, layout) {
+    super(opt)
+    this.layout = layout
+  }
+
+  //  布局
+  doLayout(callback) {
+    let task = [
+      () => {
+        this.computedBaseValue()
+      },
+      () => {
+        this.computedTopValue()
+      },
+      () => {
+        this.adjustLeftTopValue()
+      },
+      () => {
+        callback(this.root)
+      }
+    ]
+    asyncRun(task)
+  }
+
+  //  遍历数据创建节点、计算根节点的位置，计算根节点的子节点的top值
+  computedBaseValue() {
+    walk(
+      this.renderer.renderTree,
+      null,
+      (cur, parent, isRoot, layerIndex, index) => {
+        let newNode = this.createNode(cur, parent, isRoot, layerIndex)
+        // 根节点定位在画布中心位置
+        if (isRoot) {
+          this.setNodeCenter(newNode)
+        } else {
+          // 非根节点
+          // 节点生长方向
+          // 三级及以下节点以上级为准
+          if (parent._node.dir) {
+            newNode.dir = parent._node.dir
+          } else {
+            newNode.dir = index % 2 === 0 ? CONSTANTS.LAYOUT_GROW_DIR.RIGHT : CONSTANTS.LAYOUT_GROW_DIR.LEFT
+          }
+          // 定位二级节点的left
+          if (parent._node.isRoot) {
+            newNode.left =
+              parent._node.left +
+              (cur._node.width > parent._node.width
+                ? -(cur._node.width - parent._node.width) / 2
+                : (parent._node.width - cur._node.width) / 2)
+          } else {
+            newNode.left =
+              newNode.dir === CONSTANTS.LAYOUT_GROW_DIR.RIGHT
+                ? parent._node.left +
+                  parent._node.width +
+                  this.getMarginX(layerIndex)
+                : parent._node.left -
+                  this.getMarginX(layerIndex) -
+                  newNode.width
+          }
+        }
+        if (!cur.data.expand) {
+          return true
+        }
+      },
+      (cur, parent, isRoot, layerIndex) => {
+        // 返回时计算节点的areaHeight，也就是子节点所占的高度之和，包括外边距
+        if (isRoot) {
+          return
+        }
+        let len = cur.data.expand === false ? 0 : cur._node.children.length
+        cur._node.childrenAreaHeight = len
+          ? cur._node.children.reduce((h, item) => {
+              return h + item.height
+            }, 0) +
+            (len + 1) * this.getMarginY(layerIndex + 1)
+          : 0
+      },
+      true,
+      0
+    )
+  }
+
+  //  遍历节点树计算节点的top
+  computedTopValue() {
+    walk(
+      this.root,
+      null,
+      (node, parent, isRoot, layerIndex, index) => {
+        if (
+          node.nodeData.data.expand &&
+          node.children &&
+          node.children.length
+        ) {
+          let marginY = this.getMarginY(layerIndex + 1)
+          // 定位二级节点的top
+          if (isRoot) {
+            let top = node.top + node.height
+            let totalTop = top + marginY
+            node.children.forEach(cur => {
+              cur.top = totalTop
+              totalTop += cur.height + marginY
+            })
+          } else {
+            // 定位三级及以下节点的top
+            let marginY = this.getMarginY(layerIndex + 1)
+            let baseTop = node.top + node.height / 2 + marginY
+            // 第一个子节点的top值 = 该节点中心的top值 - 子节点的高度之和的一半
+            let totalTop = baseTop - node.childrenAreaHeight / 2
+            node.children.forEach(cur => {
+              cur.top = totalTop
+              totalTop += cur.height + marginY
+            })
+          }
+        }
+      },
+      null,
+      true
+    )
+  }
+
+  //  调整节点left、top
+  adjustLeftTopValue() {
+    walk(
+      this.root,
+      null,
+      (node, parent, isRoot, layerIndex) => {
+        if (!node.nodeData.data.expand) {
+          return
+        }
+        if (isRoot) return
+        // 判断子节点所占的高度之和是否大于该节点自身，大于则需要调整位置
+        let base = this.getMarginY(layerIndex + 1) * 2 + node.height
+        let difference = node.childrenAreaHeight - base
+        if (difference > 0) {
+          this.updateBrothers(node, difference / 2)
+        }
+      },
+      null,
+      true
+    )
+  }
+
+  //  更新兄弟节点的top
+  updateBrothers(node, addHeight) {
+    if (node.parent) {
+      let childrenList = node.parent.children
+      let index = childrenList.findIndex(item => {
+        return item === node
+      })
+      childrenList.forEach((item, _index) => {
+        // 自定义节点位置
+        if (item.hasCustomPosition()) return
+        // 三级或三级以下节点自身位置不需要动
+        if (!node.parent.isRoot && item === node) return
+        let _offset = 0
+        // 二级节点上面的兄弟节点不需要移动，自身需要往下移动
+        if (node.parent.isRoot) {
+          // 上面的节点不用移
+          if (_index < index) {
+            _offset = 0
+          } else if (_index > index) {
+            // 下面的节点往下移
+            _offset = addHeight * 2
+          } else {
+            // 自身也要移动
+            _offset = addHeight
+          }
+        } else {
+          // 三级或三级以下节点两侧的兄弟节点向两侧移动
+          // 上面的节点往上移
+          if (_index < index) {
+            _offset = -addHeight
+          } else if (_index > index) {
+            // 下面的节点往下移
+            _offset = addHeight
+          }
+        }
+        item.top += _offset
+        // 同步更新子节点的位置
+        if (item.children && item.children.length) {
+          this.updateChildren(item.children, 'top', _offset)
+        }
+      })
+      // 更新父节点的位置
+      this.updateBrothers(node.parent, addHeight)
+    }
+  }
+
+  //  调整兄弟节点的top
+  updateBrothersTop(node, addHeight) {
+    if (node.parent && !node.parent.isRoot) {
+      let childrenList = node.parent.children
+      let index = childrenList.findIndex(item => {
+        return item === node
+      })
+      childrenList.forEach((item, _index) => {
+        if (item.hasCustomPosition()) {
+          // 适配自定义位置
+          return
+        }
+        let _offset = 0
+        // 下面的节点往下移
+        if (_index > index) {
+          _offset = addHeight
+        }
+        item.top += _offset
+        // 同步更新子节点的位置
+        if (item.children && item.children.length) {
+          this.updateChildren(item.children, 'top', _offset)
+        }
+      })
+      // 更新父节点的位置
+      this.updateBrothersTop(node.parent, addHeight)
+    }
+  }
+
+  //  绘制连线，连接该节点到其子节点
+  renderLine(node, lines, style, lineStyle) {
+    if (lineStyle === 'curve') {
+      this.renderLineCurve(node, lines, style)
+    } else if (lineStyle === 'direct') {
+      this.renderLineDirect(node, lines, style)
+    } else {
+      this.renderLineStraight(node, lines, style)
+    }
+  }
+
+  // 直线连接
+  renderLineStraight(node, lines, style) {
+    if (node.children.length <= 0) {
+      return []
+    }
+    let { expandBtnSize } = node
+    if (!this.mindMap.opt.alwaysShowExpandBtn) {
+      expandBtnSize = 0
+    }
+    if (node.isRoot) {
+      // 当前节点是根节点
+      let prevBother = node
+      // 根节点的子节点是和根节点同一水平线排列
+      node.children.forEach((item, index) => {
+        let y1 = prevBother.top + prevBother.height
+        let y2 = item.top
+        let x = node.left + node.width / 2
+        let path = `M ${x},${y1} L ${x},${y2}`
+        lines[index].plot(path)
+        style && style(lines[index], item)
+        prevBother = item
+      })
+    } else {
+      // 当前节点为非根节点
+      if (node.dir === CONSTANTS.LAYOUT_GROW_DIR.RIGHT) {
+        let nodeRight = node.left + node.width
+        let nodeYCenter = node.top + node.height / 2
+        let marginX = this.getMarginX(node.layerIndex + 1)
+        let offset = (marginX - expandBtnSize) * 0.6
+        node.children.forEach((item, index) => {
+          let itemLeft = item.left
+          let itemYCenter = item.top + item.height / 2
+          let path = `
+            M ${nodeRight},${nodeYCenter} 
+            L ${nodeRight + offset},${nodeYCenter} 
+            L ${nodeRight + offset},${itemYCenter} 
+            L ${itemLeft},${itemYCenter}`
+          lines[index].plot(path)
+          style && style(lines[index], item)
+        })
+      } else {
+        let nodeLeft = node.left
+        let nodeYCenter = node.top + node.height / 2
+        let marginX = this.getMarginX(node.layerIndex + 1)
+        let offset = (marginX - expandBtnSize) * 0.6
+        node.children.forEach((item, index) => {
+          let itemRight = item.left + item.width
+          let itemYCenter = item.top + item.height / 2
+          let path = `
+            M ${nodeLeft},${nodeYCenter} 
+            L ${nodeLeft - offset},${nodeYCenter} 
+            L ${nodeLeft - offset},${itemYCenter} 
+            L ${itemRight},${itemYCenter}`
+          lines[index].plot(path)
+          style && style(lines[index], item)
+        })
+      }
+    }
+  }
+
+  // 直连
+  renderLineDirect(node, lines, style) {
+    if (node.children.length <= 0) {
+      return []
+    }
+    let { left, top, width, height, expandBtnSize } = node
+    if (!this.mindMap.opt.alwaysShowExpandBtn) {
+      expandBtnSize = 0
+    }
+    node.children.forEach((item, index) => {
+      if (node.isRoot) {
+        let prevBother = node
+        // 根节点的子节点是和根节点同一水平线排列
+        node.children.forEach((item, index) => {
+          let y1 = prevBother.top + prevBother.height
+          let y2 = item.top
+          let x = node.left + node.width / 2
+          let path = `M ${x},${y1} L ${x},${y2}`
+          lines[index].plot(path)
+          style && style(lines[index], item)
+          prevBother = item
+        })
+      } else {
+        let x1 =
+          item.dir === CONSTANTS.LAYOUT_GROW_DIR.LEFT
+            ? left - expandBtnSize
+            : left + width + expandBtnSize
+        let y1 = top + height / 2
+        let x2 = item.dir === CONSTANTS.LAYOUT_GROW_DIR.LEFT ? item.left + item.width : item.left
+        let y2 = item.top + item.height / 2
+        let path = `M ${x1},${y1} L ${x2},${y2}`
+        lines[index].plot(path)
+        style && style(lines[index], item)
+      }
+    })
+  }
+
+  //  曲线风格连线
+  renderLineCurve(node, lines, style) {
+    if (node.children.length <= 0) {
+      return []
+    }
+    let { left, top, width, height, expandBtnSize } = node
+    if (!this.mindMap.opt.alwaysShowExpandBtn) {
+      expandBtnSize = 0
+    }
+    node.children.forEach((item, index) => {
+      if (node.isRoot) {
+        let prevBother = node
+        // 根节点的子节点是和根节点同一水平线排列
+        node.children.forEach((item, index) => {
+          let y1 = prevBother.top + prevBother.height
+          let y2 = item.top
+          let x = node.left + node.width / 2
+          let path = `M ${x},${y1} L ${x},${y2}`
+          lines[index].plot(path)
+          style && style(lines[index], item)
+          prevBother = item
+        })
+      } else {
+        let x1 =
+          item.dir === CONSTANTS.LAYOUT_GROW_DIR.LEFT
+            ? left - expandBtnSize
+            : left + width + expandBtnSize
+        let y1 = top + height / 2
+        let x2 = item.dir === CONSTANTS.LAYOUT_GROW_DIR.LEFT ? item.left + item.width : item.left
+        let y2 = item.top + item.height / 2
+        let path = this.cubicBezierPath(x1, y1, x2, y2)
+        lines[index].plot(path)
+        style && style(lines[index], item)
+      }
+    })
+  }
+
+  //  渲染按钮
+  renderExpandBtn(node, btn) {
+    let { width, height, expandBtnSize, isRoot } = node
+    if (!isRoot) {
+      let { translateX, translateY } = btn.transform()
+      if (node.dir === CONSTANTS.LAYOUT_GROW_DIR.RIGHT) {
+        btn.translate(width - translateX, height / 2 - translateY)
+      } else {
+        btn.translate(-expandBtnSize - translateX, height / 2 - translateY)
+      }
+    }
+  }
+
+  //  创建概要节点
+  renderGeneralization(node, gLine, gNode) {
+    let isLeft = node.dir === CONSTANTS.LAYOUT_GROW_DIR.LEFT
+    let {
+      top,
+      bottom,
+      left,
+      right,
+      generalizationLineMargin,
+      generalizationNodeMargin
+    } = this.getNodeBoundaries(node, 'h', isLeft)
+    let x = isLeft
+      ? left - generalizationLineMargin
+      : right + generalizationLineMargin
+    let x1 = x
+    let y1 = top
+    let x2 = x
+    let y2 = bottom
+    let cx = x1 + (isLeft ? -20 : 20)
+    let cy = y1 + (y2 - y1) / 2
+    let path = `M ${x1},${y1} Q ${cx},${cy} ${x2},${y2}`
+    gLine.plot(path)
+    gNode.left =
+      x +
+      (isLeft ? -generalizationNodeMargin : generalizationNodeMargin) -
+      (isLeft ? gNode.width : 0)
+    gNode.top = top + (bottom - top - gNode.height) / 2
+  }
+}
+
+export default VerticalTimeline