diagram

问题 I'm trying to create a class diagram for an android project. I want my classes represent the activities, services and interfaces that I will implement. There are several questions about it on the web, but I couldn't find a definitive answer. I know that there aren't specific rules for Android and UML, but I have some doubts. How can I represent the relationship between an Activity and a AsyncTask ? How can I indicate that an Activity has an intent to another Activity ? Maybe if someone has an

问题 I would like to develop a new application in which the user might have the ability to create diagrams that depict processes. I think in this case a document based application is the only option that I have. I am familiar with C# .net, C++ MFC and J2EE. From your experience, which is the best way to accomplish this and which platform should I focus on? Diagrams must consist of boxes and arrow connections. More or less something like EPC diagram in Visio with the difference being that while a

问题 I am new to UML. I have studied more tutorials.I learned two broad categories like, UML Diagrams: 1. Structural Diagrams Class diagram Object diagram Component diagram Deployment diagram 2. Behavioral Diagrams Use case diagram Sequence diagram Collaboration diagram Statechart diagram Activity diagram But I dont know which one is high level design and low design. Anyone list out the UML diagram types based on priorities. (high-level diagrams to low level) 回答1: There is not really a well

问题 Can UML activity diagram have decision without a decision node or is it wrong? I mean, is it required to use the decision node (diamond symbol) to represent conditions? 回答1: It is legal UML. Only fUML gets formal about how a value flows into a decision for guard conditions to be compared. 回答2: No, in activity diagram you can also use a much more elaborated element: Conditional Node - is a structured activity node that represents an exclusive choice among some number of alternatives. It also

问题 I want to represent the logic of my program through a diagram, since the program is pretty complex; I need a way to explain to another person, why and how something happens in my program. Is flowchart the only option? 回答1: In UML, different diagrams are intended for different things, using different methodologies. Considering we tend to lean to the Object Oriented Methodologies, I will explain the different diagrams and how they work. Use Case Diagram - The point of use case models is to

问题 I was simply wondering, how an ISA relationship in an ER diagram would translate into tables in a database. Would there be 3 tables? One for person, one for student, and one for Teacher? Or would there be 2 tables? One for student, and one for teacher, with each entity having the attributes of person + their own? Or would there be one table with all 4 attributes and some of the squares in the table being null depending on whether it was a student or teacher in the row? NOTE: I forgot to add

问题 Can someone explain in what's the difference between elements marked in diagram? I think it only depends on how many interfaces we want to connect. Am I right? http://i.imgur.com/ZnW02Ar.png 回答1: You are not right and the diagram is syntactically incorrect. Let me first explain the concepts and their meaning: Dependency between components exist on the definition level (top part of the diagram). They can be drawn between the required and provided interface, between a component and interface or

问题 I'm quite new to relational databases and have been having a lot of trouble recently trying to understand an entity relationship diagram I've been given. Here it is: Solicitor ERD (ERD is for a made up solicitor company) Basically my task is to take this ERD and write an SQL script to create the database, obviously filling in the tables with data I can make up. The SQL syntax isn't the thing I'm having a hard time with, it's simply understanding the cardinality in the diagram. To me the terms

问题 i want to calculate the "density" of a 3d point cloud obtained by stereo vision. I implemented the 3D Voronoi diagram like in https://docs.scipy.org/doc/scipy/reference/generated/scipy.spatial.SphericalVoronoi.html Result is raise ValueError("Radius inconsistent with generators.") for many different magnitudes (i tried a lot) Example of my pointcloud is: [[ 0.63492548 0.10921954 0.12711886] [ 0.14530358 0.02687934 -0.0357723 ] [ 0.16594444 0.02741969 0.04187516] [ 0.69606036 0.06983382 -0

问题 There has been a question to a specific kind of grid: The question has already been answered but the questioner also asked if this kind of diagram has a formal name which is what I'm interested in and the accepted answer doesn't include such information. Is there any simple way to achieve something like this in GWT/GXT (apart from drawing the two lists and these lines manually)? 来源： https://stackoverflow.com/questions/33016050/diagram-of-two-lists-that-connects-elements-nm