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• Part-time work as a beginner programmer [on hold]

  - by Valentas

  I wrote to one company near my university (starting in September) and they responded that they will probably hire me from the work I have already done (some projects and Euler problems solving). It's for 15 hours/week or so in order to not fall behind uni work. They require Python, SQL, XML and a good idea about how the Web works. The job role involves acquiring data from the Web and supplying it as search results for flight seekers (people). I am eager to learn but still, what can I do to become prepared for this? I ask because I tend to gravitate from one technology to the other, trying out things but never mastering it properly. What Web technologies are involved in such a job role? I have two months and want to learn as much as possible because there is much info but I have no idea where to start.

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• Python simulation-scripts architecture

  - by Beastcraft

  Situation: I've some scripts that simulate user-activity on desktop. Therefore I've defined a few cases (workflows) and implemented them in Python. I've also written some classes for interacting with the users' software (e.g. web browser etc.). Problem: I'm a total beginner in software design / architecture (coding isn't a problem). How could I structure what I described above? Providing a library which contains all the workflows as functions, or a separate class/module etc. for each workflow? I want to keep the the workflows simple. The complexity should be hidden in the classes for interacting with the users' software. Are there any papers / books I could read about this, or could you provide some tips? Kind regards, B

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• Single responsibility principle - am I overusing it?

  - by Tarun

  For reference - http://en.wikipedia.org/wiki/Single_responsibility_principle I have a test scenario where in one module of application is responsible for creating ledger entries. There are three basic tasks which could be carried out - View existing ledger entries in table format. Create new ledger entry using create button. Click on a ledger entry in the table (mentioned in first pointer) and view its details in next page. You could nullify a ledger entry in this page. (There are couple more operation/validations in each page but fore sake of brevity I will limit it to these) So I decided to create three different classes - LedgerLandingPage CreateNewLedgerEntryPage ViewLedgerEntryPage These classes offer the services which could be carried out in those pages and Selenium tests use these classes to bring application to a state where I could make certain assertion. When I was having it reviewed with on of my colleague then he was over whelmed and asked me to make one single class for all. Though I yet feel my design is much clean I am doubtful if I am overusing Single Responsibility principle

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• Which parallel pattern to use?

  - by Wim Van Houts

  I need to write a server application that fetches mails from different mail servers/mailboxes and then needs to process/analyze these mails. Traditionally, I would do this multi-threaded, launching a thread for fetching mails (or maybe one per mailbox) and then process the mails. We are moving more and more to servers where we have 8+ cores, so I would like to make use of these cores as much as possible (and not use 1 at 100% and leave the seven others untouched). So conceptually, as an example, it would be nice that I could write the application in such a way that two cores are "continuously" fetching emails and four cores are "continuously" processing/analyzing the emails (since processing and analyzing mails is more CPU intensive than fetching mails). This seems like a good concept, but after studying some parallel patterns, I'm not really sure how this is best implemented. None of the patterns really fit. I'm working in VS2012, native C++, but I guess from a design point of view this does not really matter and just some pointers on how to organize this would be great!

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• what knowledge would I need to make a good simulation games

  - by Skeith

  I have an idea for a game like theme park but don't know how simulation games are made. I am not some noob on his first game so I appreciated constructive answers instead of "its hard, don't do it". What I want is to know how simulation game mechanics are put together. I figure it would be heaver on the AI than normal games and not knowing much about AI would like to know some programming techniques I should look into for this style game. specific techniques please not just a book on ai. what sort of architecture would be used? I guess it would have some sort of probability engine with pre designed events that are triggered based on the AI state. Would it use a FSM or be purely event driven ? Any information on how a sims game functions would be cool.

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• Is there a future for AAA game development in C#? [closed]

  - by kasperov

  When XNA was released in 2006, I was happy and started doing indie attempts. After 3 years or so, there were lots of forum discussions on prospects of AAA game development in C#, and how a high performance vedio game can easily be programmed in C#. Suddenly after 2-3 more years, these discussions have died down and everybody seems like recommending native C++... What programming language should I practice on for long term? Should I stick with C# or do an extra effort for C++? Will AAA game companies adopt C# as a replacement to C++? Note : I aim to work at a AAA game company.

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• How to add energy ball which disappears when touched by player in UDK?

  - by OliveOne

  I am new to UDK and learning game development. I want to know about how to add a ball to the game world with the following effects/actions: Glowing effect Physics-like object (just having gravity) Particles when touched by player-avatar Disappears in 1-2 seconds after touch Score updates based on different colors of ball I know little about this can be done by kismet, cascade and content creation, but do not know where to start. Please tell me the steps for this. I am trying this weekend in depth.

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• How to write loosely coupled classes in node.js

  - by lortabac

  I am trying to understand how to design node.js applications, but it seems there is something I can't grasp about asynchronous programming. Let's say my application needs to access a database. In a synchronous environment I would implement a data access class with a read() method, returning an associative array. In node.js, because code is executed asynchronously, this method can't return a value, so, after execution, it will have to "do" something as a side effect. It will then contain at least 1 line of extraneous code which has nothing to do with data access. Multiply this for all methods and all classes and you will very soon have an unmanageable "code soup". What is the proper way to handle this problem? Am I approaching it the wrong way?

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• What is the term that means "keeping the arguments for different API calls as similar as possible"?

  - by larson4

  There is a word which I can never remember... it expresses a design goal that API calls (or functions or methods or whatever) should be as similar as reasonably possible in their argument patterns. It may also extend to naming as well. In other words, all other things being equal, it is probably bad to have these three functions: deleteUser(email) petRemove(petId,species) destroyPlanet(planetName,starName) if instead you could have deleteUser(userId) deletePet(petId) deletePlanet(planetId) What is the word for this concept? I keep thinking it's "orthogonal" but it definitely isn't. Its a very important concept, and to me it's one of the biggest things that makes some APIs a joy to work with (because once you learn a few things you can pretty much use everything without looking at doco), and others a pain (because every function is done inconsistently).

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• Building (simple) stellar systems

  - by space borg

  hi I'm currently looking at how to simulate easily some stellar systems (meaning some central stars and then some planets with maybe satellites), in order to allow later some space based strategy game (hence with space ships moving around). This should all be based around time (so the state of each system differs through time) I'm quite struggling with the math behind this topic, like for example: - ellipse related math, - creating the path from planet A to B having time in mind (respective positions will change over time)... Do you know of any resources for that ? I wouldn't mind even buying books about it... thanks in advance best space borg side note: how to display all this stuff isn't a matter at this point in time, I'll simple plans for that (basically sticking to 2D and a "high level view" with no space ships/planets details, just markers)

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• What is the good way of sharing specific data between ViewModels

  - by voroninp

  We have IAppContext which is injected into ViewModel. This service contains shared data: global filters and other application wide properties. But there are cases when data is very specific. For example one VM implements Master and the second one - Details of selected tree item. Thus DetailsVm must know about the selected item and its changes. We can store this information either in IAppContext or inside each concerned VM. In both cases update notifications are sent via Messenger. I see pros and cons for any of the approaches and can not decide which one is better. 1st: + explicitly exposed shared proerties, easy to follow dependencies - IAppContxt becomes cluttered with very specific data. 2nd: the exact opposite of the first and more memory load due to data duplication. May be someone can offer design alternatives or tell that one of the variants is objectively superior to the other cause I miss something important?

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• What tools exist for designing layouts and pre-production templates for Rails 3 applications?

  - by rcd

  I develop Rails 3 applications, but prior to this, my background was a designer (typically making mockups in Photoshop and then breaking them down to HTML5/CSS3). Now, some great tools/templates exist for getting working layouts ready for Rails and other apps quickly, e.g., http://railsapps.github.com/rails-composer/. Many are using CSS Frameworks such as Twitter Bootstrap. I'd like to know whether there is a local app (for Mac) that can design layouts, much the way Dreamweaver would, but that are geared towards being utilized in a Twitter Bootstrap situation alongside Ruby (Rails) or Python apps, etc.

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• Considerations when designing a file type

  - by AndyBursh

  I'm about to start writing a process for saving some data structure from code in to a file of some proprietary, as-yet-undefined type. However, I've never designed a file type or structure before. Are there any things, generally speaking, that I should consider before starting my design? Are there any accepted good practices here? Bad practices I should avoid? Any absolute do's and don'ts? Can anybody recommend any good reading on this topic?

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• Is having a single `IndexWriter` instance in Lucene a good idea?

  - by Dragos

  I am trying to understand how Lucene should be used. From what I have read, creating an IndexReader is costly, so using a Search Manager shoulg be the right choice. However, a SearchManager should be produced by a NRTManager(which, by the way, should replace the IndexWriter for every add or delete operation performed). But in order to have a NRTManager, I should first have an IndexWriter, and here comes my problem. The documentation says: an IndexWriter is thread-safe the constructor of this class takes a Directory object, so it seems creating an instace should be costly(as in the case of an IndexReader) all changes are buffered and flushed periodically(so they seem to encourage using a single instance) but: the changes, although flushed will only be visible after commit or close after finished making updates(add/delete), the instance should be closed I also found this: http://stackoverflow.com/questions/5374419/forgot-to-close-the-lucene-indexwriter-after-adding-documents-to-the-index where it is said that not closing a writer might ruin everything So what am I really supposed to do? Is having a single IndexWriter instance a good idea (make only commit and never close it)? EDIT: What is more, if I use NRTManager, how can I make acommit`? Is it even possible?

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• JiglibX addition to existing project questions

  - by SomeXnaChump

  Got a very simple existing project, that basically contains a lot of cubes. Now I am wanting to add a physics system to it and JiglibX seemed like the simplest one with some tutorials out there. My main problem is that the physics don't seem to be working how I imagined, I expected my tower of cubes to come crashing down, but they dont seem to do anything. I think my problem is that my cubes do not inherit DrawableGameComponent, they are managed by a world object that will update and render them. So they are at no point put into the games component list. I am not sure if this means that JiglibX will not be able to interact with them as in all the tutorials there are no explicit calls to add the Body objects to the physics system, so I can only presume that they are using a static/singleton under the hood which automatically hooks in all things, or they use the game objects component list somehow. I also noticed that in alot of the tutorials they use the following when setting up the physics system: float timeStep = (float)gameTime.ElapsedGameTime.Ticks / TimeSpan.TicksPerSecond; PhysicsSystem.CurrentPhysicsSystem.Integrate(timeStep); Would it not be better to keep a local instance of the created PhysicsSystem object and just call myPhysicsSystem.Integrate(timeStep)?

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• What frameworks are available for cross device 2d game development?

  - by kim3er

  I'm about to embark on a 2D gaming project. Initially, I'll be targeting iPhone and Facebook, but would like to expand the rollout to include Android (and possibly Windows Phone) in a future phase. Flash and Unity seem to be the most likely suspects, but is one better than the other? Are there pros/cons that may not be obvious at first glance? Are there frameworks that I have not considered? I am primarily a .NET developer, so the Unity C# integration is appealling. But I also have experience with AS3, JavaScript and Objective-C. Rich

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• How do I draw a texture to a MSTerrain object?

  - by Brad

  I'm using Farseer to make a game in XNA and I can't seem to figure this out. I've decided to use MSTerrain for making my game's terrain because I wanted destructible terrain and MSTerrain seemed like the best bet. Unfortunately, I'm stumped on how to actually show the terrain. When I generate the terrain it's visible in debug view, but MSTerrain does not have a Draw method, so I'm wondering how it is supposed to be drawn to the screen? Is it worth pursuing? I'm starting to think that MSTerrain is more trouble than it's worth, is there another better way to do this with bodies?

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• It is worth planning before jumping in the code?

  - by Rushino

  I always thought that planning is important for a game. But i don't know at which point. Some are telling me to code instead of planning but i feel like its still important because when you will be in the code you will know what to do next more easily. I am currently working on a game that will have lots of content so i decided to start a design document introducing thoses content and at a side-level i am doing proofs of concept to check if it can be done. Parts of each proofs of concept then could be used later in the real game. EDIT: I am working alone on this project. So my question is : It is worth planning before jumping in the code ? Im still interested to know what others have to say about this. Cause i still get some poeple saying i should code instead of thinking.. so what your opinion on this ?

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• Figuring out the Call chain

  - by BDotA

  Let's say I have an assemblyA that has a method which creates an instance of assemblyB and calls its MethodFoo(). Now assemblyB also creates an instance of assemblyC and calls MethodFoo(). So no matter if I start with assemblyB in the code flow or with assemlyA, at the end we are calling that MethodFoo of AssemblyC(). My question is when I am in the MethodFoo() how can I know who has called me? Has it been a call originally from assemblyA or was it from assemlyB? Is there any design pattern or a good OO way of solving this?

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• My Favourite Two Buttons in Denali CTP1 SSIS

  In SSIS for SQL Server 2005 and SQL Server 2008 when you delete something from the design surface it is gone.  The only real way of getting the deleted item(s) back is to revert to a previous version of the package or to redo the deleted items manually.  Neither of these options is particularly great.  I have made this mistake before and cursed not having CTL+Z and CTL+Y.  Denali changes this.  We can now undo and redo.  Very very welcome.  Well done, finally, the SSIS team.

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• 3D touch "Minority Report" style interface - what platform gets me there the fastest?

  - by Ross Braden

  I'm working on a project that requires touch interface, though the use case is desktop more than mobile. Want to start out platform agnostic, not a mobile app. There will be gridwork type of 3D objects and diagraming being represented - think AutoCAD or Minority Report. Want to build a prototype that will have hooks into a database to represent the data. Any advice on what tools to use both for the design and the development of the functionality is greatly appreciated. Thanks!

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• What are the caveats of the event system built on Messenger rather than on classic .NET events?

  - by voroninp

  MVVM Light and PRISM offer messenger to implement event system. the approximate interface looks like the following one: interface Messanger { void Subscribe<TMessageParam>(Action<TMessageParam> action); void Unsubscribe<TMessageParam>(Action<TMessageParam> action); void Unsubscribe<TMessageParam>(objec actionOwner); void Notify<TMessageParam>(TMessageParam param); } Now this model seems beneficial comparing to classic .net events. It works well with Dependency Injection. Actions are stored as weak references so memory leaks are avioded and unsubscribe is not a must. The only annoyance is the need to declare new TMessageParam for each specific message. But everything comes at a cost. And what I'm really worried about is that I see no shortcomings of this approach. Has anoyne the experience of some troubles with this design pattern?

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• Redesigning foreign website for my portfolio and offer it?

  - by BeatMe

  Hi, I've had an interest in web design for a long time and am constantly trying to learn something new. I do not have any references in my portfolio, but would like to start freelancing. Is it bad practice to redesign a website from a local company and use it for my portfolio? Do I infringe any copyright? What if I offer the redesign to the company? Has someone done this before? If so, share your experiences.

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• ideas on multiplayer games which include lots of collaboration?

  - by user494461

  For my master thesis I wanted to design a small multiplayer game which includes more than one player(maybe 5), has 2-3 players collaborating at a time to achieve some task. The most important thing is realistic simulation of the movable objects in the scene which more than one player should simultaneously interact with. I would also prefer large virtual environments (VEs) like mmogs where groups of players are interacting in different areas of the VE. tasks for players should include 2-3 players touching movable objects at same time. e,g, a very basic task can be users lifting a cube together and pushing it through a hole I am not new to designing virtual environments with openGL, but have never designed games before and rarely play other than few of my favorite ones like Fifa. I wanted some ideas on what kind of games should I look at which should help me with ideas for my tasks for the users to gain points and win in games? any current indie games which might inspire me?

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• Dynamic Components

  - by Alex

  I am attempting to design a component-based architecture that allows Components to be dynamically enabled and disabled, much like the system employed by Unity3D. For example, all Components are implicitly enabled by default; however, if one desires to halt execution of code for a particular Component, one can disable it. Naively, I want to have a boolean flag in Component (which is an abstract class), and somehow serialize all method calls into strings, so that some sort of ComponentManager can check if a given Component is enabled/disabled before processing a method call on it. However, this is a pretty bad solution. I feel like I should employ some variation of the state paradigm, but I have yet to make progress. Any help would be greatly appreciated,

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