(myTree, parentPt, nodeTxt)
| 295 | 2017-07-24 |
| 296 | """ |
| 297 | def plotTree(myTree, parentPt, nodeTxt): |
| 298 | decisionNode = dict(boxstyle="sawtooth", fc="0.8") #设置结点格式 |
| 299 | leafNode = dict(boxstyle="round4", fc="0.8") #设置叶结点格式 |
| 300 | numLeafs = getNumLeafs(myTree) #获取决策树叶结点数目，决定了树的宽度 |
| 301 | depth = getTreeDepth(myTree) #获取决策树层数 |
| 302 | firstStr = next(iter(myTree)) #下个字典 |
| 303 | cntrPt = (plotTree.xOff + (1.0 + float(numLeafs))/2.0/plotTree.totalW, plotTree.yOff) #中心位置 |
| 304 | plotMidText(cntrPt, parentPt, nodeTxt) #标注有向边属性值 |
| 305 | plotNode(firstStr, cntrPt, parentPt, decisionNode) #绘制结点 |
| 306 | secondDict = myTree[firstStr] #下一个字典，也就是继续绘制子结点 |
| 307 | plotTree.yOff = plotTree.yOff - 1.0/plotTree.totalD #y偏移 |
| 308 | for key in secondDict.keys(): |
| 309 | if type(secondDict[key]).__name__=='dict': #测试该结点是否为字典，如果不是字典，代表此结点为叶子结点 |
| 310 | plotTree(secondDict[key],cntrPt,str(key)) #不是叶结点，递归调用继续绘制 |
| 311 | else: #如果是叶结点，绘制叶结点，并标注有向边属性值 |
| 312 | plotTree.xOff = plotTree.xOff + 1.0/plotTree.totalW |
| 313 | plotNode(secondDict[key], (plotTree.xOff, plotTree.yOff), cntrPt, leafNode) |
| 314 | plotMidText((plotTree.xOff, plotTree.yOff), cntrPt, str(key)) |
| 315 | plotTree.yOff = plotTree.yOff + 1.0/plotTree.totalD |
| 316 | |
| 317 | """ |
| 318 | 函数说明:创建绘制面板 |
no test coverage detected