UG二次开发NXOpen-Python(五) 修改基本特征
修改基本特征
关于编辑特征，自己在学习这块的时候被坑过，原因在于官方提供的《nxopen_getting_started_v12》中有这样一段描述：
You can actually use the CreateSphereBuilder function for either creation or editing purposes: if you input an existing Sphere object, then the Commit method will edit this sphere; if you input Nothing, then the Commit method will create a new sphere object, as in our code above
大致意思就是：创建特征和编辑特征差不多，如果你创建builder时传入的参数是一个存在的特征，当你commit时就会编辑这个特征，如果你创建builder时传入的参数是NULL，当你commit的时候就会创建一个新的特征，我按照这个方法在NX12.0中怎么都编辑不成功，后来查询文档，终于发现了EditWithRollbackManager这个类，多余的不细说，可以去看文档，只把修改特征的流程贴下面：
NXOpen.Features.FeatureCollection.StartEditWithRollbackManager()- Feature edit using builder
NXOpen.Features.EditWithRollbackManager.UpdateFeature()NXOpen.Features.EditWithRollbackManager.Stop()NXOpen.Features.EditWithRollbackManager.Destroy()
也就是说除了第二步外，我们还有1，3，4，5需要做，文档中提到这个是在NX11.0.0中新提出的，不知道是不是NX10.0不需要，下面以一个例子来说明
首先，自定义菜单文件，CreateAndEdit.men，内容如下：
VERSION 120
EDIT UG_GATEWAY_MAIN_MENUBAR
MENU MY_MENU
BUTTON MY_ITEM1
LABEL createBlock
ACTIONS createBlock
BUTTON MY_ITEM2
LABEL editBlock
ACTIONS editBlock
END_OF_MENU
TOP_MENU
CASCADE_BUTTON MY_MENU
LABEL My App
END_OF_TOP_MENU
该文件放置在startup文件夹
然后创建edit_feature.py，内容如下：
import NXOpen
import NXOpen.Features
import NXOpen.MenuBar
import tkinter as tk
import traceback
from tkinter.ttk import Label, Button, Entry
class EditUI():
def __init__(self, length, width, height):
self.win = tk.Tk(baseName='edit')
self.length = tk.DoubleVar(value=length)
self.width = tk.DoubleVar(value=width)
self.height = tk.DoubleVar(value=height)
self.createUI()
self.win.mainloop()
def createUI(self):
self.win.title('编辑长方体')
Label(master=self.win, text='请输入需要编辑的参数').grid(
row=0, column=0, columnspan=2)
Label(master=self.win, text='长度').grid(row=1, column=0)
Entry(master=self.win, textvariable=self.length).grid(row=1, column=1)
Label(master=self.win, text='宽度').grid(row=2, column=0)
Entry(master=self.win, textvariable=self.width).grid(row=2, column=1)
Label(master=self.win, text='高度').grid(row=3, column=0)
Entry(master=self.win, textvariable=self.height).grid(row=3, column=1)
Button(master=self.win, text='确定', command=self.clickButton).grid(
row=4, column=0, columnspan=2)
def clickButton(self):
self.win.destroy()
self.result = (self.length.get(),
self.width.get(), self.height.get())
class CreateAndEditBlock():
def __init__(self):
self.block_feature = None
self.theSession:NXOpen.Session = NXOpen.Session.GetSession()
self.lw:NXOpen.ListingWindow=self.theSession.ListingWindow
self.theUI = NXOpen.UI.GetUI()
def createBlock(self,e):
self.lw.Open()
self.lw.WriteLine("create block!!!")
self.lw.WriteLine(e.ActiveButton.ButtonName)
self.workPart = self.theSession.Parts.Work
if self.block_feature:
self.theUI.NXMessageBox.Show(
"", NXOpen.NXMessageBoxDialogType.Information, '长方体已经存在')
return NXOpen.MenuBar.MenuBarManagerCallbackStatus.Continue
# 创建builder
blockFeatureBuilder1 = self.workPart.Features.CreateBlockFeatureBuilder(
NXOpen.Features.Block.Null)
# 类型-原点和边长
blockFeatureBuilder1.Type = NXOpen.Features.BlockFeatureBuilder.Types.OriginAndEdgeLengths
# 布尔
blockFeatureBuilder1.BooleanType = NXOpen.Features.FeatureBooleanType.Create
# 原点和边长参数
originPoint1 = NXOpen.Point3d(0.0, 0.0, 0.0)
blockFeatureBuilder1.SetOriginAndLengths(
originPoint1, "100", "100", "100")
# commit
self.block_feature = blockFeatureBuilder1.CommitFeature()
blockFeatureBuilder1.Destroy()
return NXOpen.MenuBar.MenuBarManagerCallbackStatus.Continue
def editBlock(self,e):
if not self.lw.IsOpen:
self.lw.Open()
self.lw.WriteLine(e.ActiveButton.ButtonName)
self.lw.WriteLine("edit block!!")
try:
if not self.block_feature:
self.theUI.NXMessageBox.Show(
"", NXOpen.NXMessageBoxDialogType.Information, '长方体还未创建，请先创建')
return NXOpen.MenuBar.MenuBarManagerCallbackStatus.Continue
# 创建builder,由于是编辑特征，以要修改的特征作为参数
blockFeatureBuilder1 = self.workPart.Features.CreateBlockFeatureBuilder(
self.block_feature)
# 创建修改参数输入界面
ui = EditUI(blockFeatureBuilder1.Length.Value,
blockFeatureBuilder1.Width.Value,
blockFeatureBuilder1.Height.Value)
markId1 = self.theSession.SetUndoMark(
NXOpen.Session.MarkVisibility.Visible, "Redefine Feature")
editWithRollbackManager1 = self.workPart.Features.StartEditWithRollbackManager(
self.block_feature, markId1)
try:
blockFeatureBuilder1.SetLength(str(ui.result[0]))
blockFeatureBuilder1.SetWidth(str(ui.result[1]))
blockFeatureBuilder1.SetHeight(str(ui.result[2]))
self.block_feature = blockFeatureBuilder1.CommitFeature()
except Exception as ex:
NXOpen.UI.GetUI().NXMessageBox.Show(
"Python", NXOpen.NXMessageBox.DialogType.Error, str(ex))
finally:
editWithRollbackManager1.UpdateFeature(False)
blockFeatureBuilder1.Destroy()
editWithRollbackManager1.Stop()
editWithRollbackManager1.Destroy()
except Exception as ex:
self.lw.WriteLine(str(ex))
self.lw.WriteLine(traceback.format_exc())
return NXOpen.MenuBar.MenuBarManagerCallbackStatus.Continue
def startup(argc, args):
create_and_edit = CreateAndEditBlock()
menubarMan = create_and_edit.theUI.MenuBarManager
menubarMan.AddMenuAction("createBlock", create_and_edit.createBlock)
menubarMan.AddMenuAction("editBlock", create_and_edit.editBlock)
return 0
打开UG，新建模型，会出现自定义的菜单项
点击createBlock会创建一个100X100X100的长方体，点击editBlock会弹出输入界面，提示输入参数：
输入框里面的数值为长方体长宽高现有的数值，更改为其它数值后，点击确定，就可以修改长方体属性，比如说我们将宽度改为150，点击确定：
下次再点击editBlock，输入框里的宽度显示为150
由于涉及的点较多，做一个总结
- 通过代码可以看出NXOpen利用Builder编辑特征的流程，与前面提到的一致
- 脚本的运行的方式为执行回调函数，也就是将editBlock函数和createBlock函数分别与菜单中的editBlock和createBlock绑定，NX12.0的官方文档中NXOpen-Python并没有这种方式，官方文档中只有C++，.NET,JAVA才有回调。
- 回调函数的绑定，即MenuBarManager.AddMenuAction的执行是在NX启动时完成的，对于这点，NX12.0的官方文档也缺乏说明，在Automatically at NX Start up这一章节中只针对C++，.NET,JAVA作出了说明,其中C/C++的函数签名为int ufsta( void )，VB.NET的函数签名为Function Startup ( ) As Integer，JAVA的函数签名为int startup (void)，需要在NX启动时加载的程序文件应放置在startup文件夹下，Python的函数签名为startup(argc, args)
- 文中长方体参数的编辑输入UI是用tkinter完成的，其实也可以使用Block UI Styler来完成
- 利用MenuScript来自定义菜单
