使用ug二次开发功能和pythonug自动测量模型长宽高并标注于截图上

要使用UG二次开发功能和Python进行自动测量模型的长宽高，并将其标注于截图上，可以按照以下步骤进行操作：

安装UG NX软件，并确保已安装UG NX的Python API模块。
在Python中导入UG NX的API模块，例如import NXOpen。
使用UG NX的API来加载模型文件，例如theSession = NXOpen.Session.GetSession()。
创建一个新的测量对象，例如theMeasureManager = theSession.MeasurementManager。
使用测量对象来测量模型的长宽高，例如：

measurement1 = theMeasureManager.CreateMeasurement()
measurement1.ManualObject = thePart
measurement1.MeasureType = NXOpen.Measure.MeasureType.Distance
measurement1.SnapTo = NXOpen.Measure.SnapTo.StartEnd
measurement1.MeasureMode = NXOpen.Measure.MeasureMode.PointToPoint
measurement1.StartPoint = NXOpen.Point3d(0, 0, 0)
measurement1.EndPoint = NXOpen.Point3d(1, 0, 0)
measurement1.Evaluate()
length = measurement1.Value

measurement2 = theMeasureManager.CreateMeasurement()
measurement2.ManualObject = thePart
measurement2.MeasureType = NXOpen.Measure.MeasureType.Distance
measurement2.SnapTo = NXOpen.Measure.SnapTo.StartEnd
measurement2.MeasureMode = NXOpen.Measure.MeasureMode.PointToPoint
measurement2.StartPoint = NXOpen.Point3d(0, 0, 0)
measurement2.EndPoint = NXOpen.Point3d(0, 1, 0)
measurement2.Evaluate()
width = measurement2.Value

measurement3 = theMeasureManager.CreateMeasurement()
measurement3.ManualObject = thePart
measurement3.MeasureType = NXOpen.Measure.MeasureType.Distance
measurement3.SnapTo = NXOpen.Measure.SnapTo.StartEnd
measurement3.MeasureMode = NXOpen.Measure.MeasureMode.PointToPoint
measurement3.StartPoint = NXOpen.Point3d(0, 0, 0)
measurement3.EndPoint = NXOpen.Point3d(0, 0, 1)
measurement3.Evaluate()
height = measurement3.Value

使用UG NX的API来进行截图，并将模型的长宽高标注于截图上，例如：

theUI = theSession.UIManager
theViewport = theUI.ActiveViewport
theViewport.CopyBitmapToFile("screenshot.png")
theAnnotationManager = theViewport.AnnotationManager
theAnnotationManager.ShowAssociativeAnnotations = True
theAnnotationManager.SetText(
    NXOpen.Point3d(0, 0, 0), "Length: " + str(length) + "\nWidth: " + str(width) + "\nHeight: " + str(height))

运行Python脚本，即可自动测量模型的长宽高，并将其标注于截图上。

请注意，以上代码仅为示例，并假设你已经熟悉UG NX的API和Python编程。实际操作中，你可能需要根据具体需求进行适当的修改和调整