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• Data-driven animations

  - by saadtaame

  Say you are using C/SDL for a 2D game project. It's often the case that people use a structure to represent a frame in an animation. The struct consists of an image and how much time the frame is supposed to be visible. Is this data sufficient to represent somewhat complex animation? Is it a good idea to separate animation management code and animation data? Can somebody provide a link to animations tutorials that store animations in a file and retrieve them when needed. I read this in a book (AI game programming wisdom) but would like to see a real implementation.

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• Video of my session from SQLBits 8 (Brighton)

  - by NeilHambly

  If you missed my session @ SQLBits 8 (Brighton) on "Queues & Waits" and are feeling somewhat brave, you can now view it in your own home/office and @ your leisure, so pull up a chair and settle in for a hour of "Waiting" .. hmmm that doesn't sound quite right but if you insist Follow this link and enjoy me if Full HDD if that is your preference (is that the right word ?), well hopefully you will not cringe quite as much as I did watching it {But I do think that is universal...(read more)

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• Accepting a numerical range in a function call

  - by dekpos

  I have encountered two ways of doing it: void foo(int from, int to); /* 'from' inclusive, 'to' exclusive */ void foo(int startIndex, int rangelength); Has one style historically been preferred over the other? If so, was it just a matter of convention or was it due to some deeper underlying reason? I'm currently programming in Java and noticed that the Arrays class uses the former style. The exclusivity of the to argument felt somewhat unintuitive to me, which led me to ask this question.

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• Any good site that teaches C++?

  - by Shinmaru

  I am searching for any good site that teaches C++, that can explain most to all things about it(general) and has a decent active community. About Me: I am new to programming(knows nothing of it, so please bare with me), I have only learned(to a very basic form) LUA scripting Language, so yes I am your complete newbie. I got interested in programming, from scripting in LUA, so you can say it was my small stepping stone, One would basically take a course in college, but not everyone is well funded for that and I can't buy books for the same said reason(yes I'm somewhat poor, only money for essentials and bills), I'm not trying to get sympathy, just stating my conditions. and Please, something in between the lines of 'Programming for Dummies'(I'm not the brightest crayon in the box), I know this will not be easy, but your help will be most appreciated. I would learn for either Windows and/or Linux/Unix. I use both. Site(s) I know: Cplusplus.org(quite inactive and tutorials are a little for the programming savvy.

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• Tile transitions - external vs internal

  - by omgnoseat

  I've been looking at a couple of games and noticed that the transitions between tiles are handled somewhat different. I was wondering which methods are to be used in different situations and why. I'm currently using internal edges in a top-down game, and it's working out so far. But I don't want to run into problems later on, and have to redo the whole tileset. I noticed that platforming games mostly use the internal edges, and top-down games mostly use external and hybrid transitions. I can see how these tiles are used to create "depth" in top-down games, where the player apears to be standing in front of a wall for example. But it seems unlikely that such a small feature decides the entire method for tile transitions. You could always alter the bounding box to create the same effect.

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• code cowboy on the team

  - by MK01

  How do you deal with a team member who is senior to you and always jumps on other people's projects and completes them over night or over the weekend? She seems to work 80 hour weeks whether there is an emergency or not and it is somewhat difficult to predict which part of your todo list she is going to strike next. Sometimes days of your work are wasted because on Monday morning you find a checkin completing the project you've spent most of the previous week working on. To people asking of the quality: Usually it is quite good but: there is also a lot of refactoring of code involved, including code 'owned' by other team members, w/o regard for the test coverage, with the obvious results.

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• Supporting early versions of Android

  - by Philip Sheard

  What policy do developers have when it comes to supporting earlier versions of Android? I still support Android 2.1 and above, but this means that I am unable to use features such as the action bar. Over 40% of my users are still running versions below 3.0, so I feel somewhat constrained about this. The problem is that 3.x was not very successful, so 2.3.x will be with us for some time. But all new devices will now be shipping with 4.x. I am wondering whether 4.x users are more likely to pay for an app, while most 2.3.x users are just looking.

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• How to access variables of uninitialized class?

  - by oringe

  So I've gone with a somewhat singleton approach to my game class: #include "myGame.h" int main () { myGame game; return game.Execute(); } But now I need to define a class that accesses variables in the instance of myGame. class MotionState { public: virtual void setWorldTransform (...) { VariableFromMyGameClass++; //<-- !? ...} }; I'm trying to integrate this class into my project from an example that just uses globals. How can I access variables of myGame class in the definition of new classes? Should I give up on my singleton approach?

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• What to use to make voice chat (and some more) on a web?

  - by Tunococ

  I am trying to make available on my website a voice chat for a small group of people that allows some other means to interact such as text messaging, photo sharing, file sharing, simple drawing and silly games. In other words, something similar to older MSN Messenger, but on the web. Any ideas on what to use? To clarify, I am looking for suggestions on languages and libraries to use. I want to be able to fully customize it as much as possible because I might want to add other (somewhat interesting) functions later. Low-level programming is fine if required, but platform dependency isn't that much preferred.

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• Connect divs with (non-straight) lines [migrated]

  - by Snailer

  I'd like to develop my site with a layout that looks somewhat like houses with connected plumbing, or multiple computers connected to a network. Basically, the will be boxes floating in space, with lines connecting some of the boxes. I'd like these lines to have some turns in them as well (just simple 90 degree corners) rather than just a straight line. My question is what is the best way to achieve this, and perhaps a small example. My thoughts were to use: PHP and CSS: I could create a background grid and then, with some complicated algorithms, draw paths using the grid's borders. This would be more dynamic, but I'm not sure I can plot the math all by myself. just CSS: Perhaps this is as simple as making some pre-drawn lines like L-shapes and T-junctions, then just placing and scaling them. But I don't believe there's a way to scale an image by slicing it.. so the line width would be scaled and thus each image would look different. Any thoughts?

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• Is it bad practice to run Node.js and apache in parallel?

  - by Camil Staps

  I have an idea in mind and would like to know if that's the way to go for my end application. Think of my application as a social networking system in which I want to implement chat functionality. For that, I'd like to push data from the server to the client. I have heard I could use Node.js for that. In the meanwhile, I want a 'regular' system for posting status updates and such, for which I'd like to use PHP and an apache server. The only way I can think of is having Node.js and apache running parallel. But is that the way to go here? I'd think there would be a somewhat neater solution for this.

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• Ubuntu installation time problem

  - by hellodear

  I am installing Ubuntu and I am stuck at a point. The step is when it is asking me to select partition. It is showing me error: "No file system is defined Please correct this from partitioning menu". I am getting this error when I am clicking "Install". I want Ubuntu to install in /dev/sda7 which is 226727 Mb. I have Windows 8 in my system and I want to dual boot the system. So how to correct this error? I want to allocate this whole partition to Ubuntu only. Secondly, What should I put in the option: "Device for boot loader installation"? By default it is somewhat like this: "ATA WDC WD5000..." something like this. Please tell my both these questions. I would be very thankful to you. Thanks.

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• fault tolerant uploading tool

  - by andersonbd1

  I'm setting up a wordpress site for a friend who has some somewhat large audio files (150M)... He's on a bad connection and I'd guess it'll take him a while to upload those files with the normal wordpress way. I'm looking for a tool that I can install on the server that allows uploads and is also fault tolerant... for example if you loses his connection, or power, or whatever it'll pick up where it left off. I realize web technologies probably don't do that, but perhaps flash or something? Any ideas?

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• How can I disable as much "flair" as possible in Unity?

  - by UlfR

  I'm running Ubuntu 11.10 from a fresh install on a somewhat aged computer, so I have some speed problems. But since I do want to use the new cool way to work with things that Unity introduces I do not want to fiddle with getting another desktop environment. My idea is to disable as much flair as possible, but there are tonnes of options that I do not understand or have the time to read up on when I launch CompizConfig Settings Manager. Which of these could safely be disabled? Are there other places where performance could be gained by disabling things? So how can I make the whole thing a little more snappy?

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• Global variable in a Linux shared library

  - by user3730495

  Suppose we have the following setup under Linux, .so library named "libcnt.so" and 3 user space apps: "app1", "app2", "app3". This library does 1 simple thing, it says to the app (app dynamically links the library at runtime) by how many apps it is already linked. Apps should have access to link counter. My knowledge in C and Linux is somewhat limited in this aspect, but as I understand this information should be stored in a global variable inside the shared object. Something like: in libcnt.h extern int cnt_loads; in libcnt.c int cnt_loads = 0; // where each linking increments this counter or something... So, my question is how it should be declared and/or defined inside .so library to guaranty that multiple apps from user space get the same instance of that variable counter?

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• When going for an interview for web development at an agency, can a real example be expected?

  - by KPO

  I just started coding a year ago. By "coding" I mean HTML(5), CSS(3), and only a few times I implemented AJAX and JavaScript. I am interviewing for a position that expects me to know HTML, CSS, JS, JQuery, and AJAX. I am good with HTML5/CSS3 and somewhat ok with js. If I go for an interview, will they expect me to write code during the interview? I do have a live website as an example and snapshots of past projects that I sent to them. I am a little nervous, so any tips or something from your experience I can learn will be helpful.

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• What languages should I learn before I go to college? [closed]

  - by CLUEL3SS

  I've been working with PHP, MySQL, and some html for the past 3-4 years now just as a hobby. I'm only 19 and college is going to come soon, I want to go for Web and Software development and/or Network Security and Administration, I know the networking is a whole different ballpark, but as for programming, which languages do you suggest I get under my belt before college? I was thinking the C languages (C++, C#), Java, .NET; Should I learn any more Server Side Scripting languages? Python, Perl, Ruby? I used to be somewhat familiar with writing Java, but haven't written in Java in a good while, what would you suggest? Thanks!

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• Files: Name column basically useless in list view. Feature or bug?

  - by Luksurious

  So the following is happening in Files whenever the width of the window is somewhat smaller than all the content of the list: In list view the name column is cropped unto a point where no name is visible at all! And it is even not possible to change the column size manually. Funnily, in some situations it quickly flickers from a larger column width to the small one back and forth before settling on the small size. Unnecessarily to say, it is extremely annoying. Is there a way around this or is this just "bad design"? Oh yeah, Ubuntu 13.04 & 13.10, Files version 3.8.2.

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• What languages should I leaarn before I go to college? [closed]

  - by CLUEL3SS

  I've been working with PHP, MySQL, and some html for the past 3-4 years now just as a hobby.. I'm only 19 and college is going to come soon, I want to go for Web and Software development and/or Network Security and Administration, I know the networking is a whole different ballpark, but as for programming, which languages do you suggest I get under my belt before college? I was thinking the C languages (C++, C#), Java, .NET; Should I learn any more Server Side Scripting languages? Python, Perl, Ruby? I used to be somewhat familiar with writing Java, but haven't written in Java in a good while, what would you suggest? Thanks!

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• jquery stop image rotation on mouseover, start on mouseout / hover

  - by Matt Nathanson

  I have built a jQuery rotator to rotate through 3 divs and loop them. I would like to add the functionality on mouse over to "freeze" the current div and then start again on mouse out. I've thought about setting a variable to false at the start of the function and setting it true when it's on it's current frame but I've got my self a bit confused. I've also tried to use the hover function but when using the in and out handlers, I'm confused as to how to stop, restart the animation. function ImageRotate() { var CurrentFeature = "#container" + featureNumber; $(CurrentFeature).stop(false, true).delay(4500).animate({'top' : '330px'}, 3000); var featureNumber2 = featureNumber+1; if ( featureNumber == numberOfFeatures) {featureNumber2 = 1} var NewFeature = "#container" + featureNumber2; $(NewFeature).stop(false, true).delay(4500).animate({'top' : '0px'}, 3000); var featureNumber3 = featureNumber-1; if ( featureNumber == 1) {featureNumber3 = numberOfFeatures}; var OldFeature = "#container" + featureNumber3; $(OldFeature).stop(false, true).delay(4500).css('top' , '-330px'); setTimeout('if (featureNumber == numberOfFeatures){featureNumber = 1} else {featureNumber++}; ImageRotate2()', 7500)}; Any help would be greatly appreciated!! Thanks, Matt

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• Gmail IMAP OAuth for desktop clients

  - by Sabya

  Recently Google announced that they are supporting OAUth for Gmail IMAP/SMTP. I browsed through their multiple documentations, but still I am confused about if they support OAuth for installed applications. 1. In this documentation they say: Note: Though the OAuth protocol supports the desktop/installed application use case, Google only supports OAuth for web applications. But they also have a document for OAuth for installed applications. 2. When I read the OAuth specification pointed by them, it says (in section 11.7): In many applications, the Consumer application will be under the control of potentially untrusted parties. For example, if the Consumer is a freely available desktop application, an attacker may be able to download a copy for analysis. In such cases, attackers will be able to recover the Consumer Secret used to authenticate the Consumer to the Service Provider. Also I think the disclaimer in point 1 above is about Google Data APIs, and surely IMAP/SMTP is not a part of them. I understand that for installed applications I can have a setup like: Have a small web-app at say example.com for my application. This web-app talks to Google gets the access token. The installed application talks to example.com only to get the access token. Installed application then talks to Google with the access token. I am now confused. Is this the only way?

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• UML class diagram vs ER database diagram

  - by salva84

  Hi, I'm a little confused, I'm developing a program, the program consist in two parts, the server and the clients, there are groups, places, messages... stored in the server, and the clients has to connect with it. I've design the use cases diagram, the activity diagrams, and I have design the class diagram too. The thing is that I want to implement the server in a mysql tables for storing the users, groups, places... users in groups... so I've designed a E-R diagram consisting in 6 tables, but the problem is that I think that my class diagram and my ER diagram looks too similar, I mean, I think I'm not doing things right because I have a class for each table practically, and when I have to extract all the users on my system, do I have to convert all the rows into objects at first and write in the database for each object modified? The easy choice for me would be to base my whole application only in the database, and making a class to extract and insert data in it, but I have to follow the UML specification and I'm a little confused what to do with the class diagram, because the books I have read say that I have to create a class for each "entity" of my program. Sorry for my bad English. Thank you.

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• GH-Unit for unit testing Objective-C code, why am I getting linking errors?

  - by djhworld

  Hi there, I'm trying to dive into the quite frankly terrible world of unit testing using Xcode (such a convoluted process it seems.) Basically I have this test class, attempting to test my Show.h class #import <GHUnit/GHUnit.h> #import "Show.h" @interface ShowTest : GHTestCase { } @end @implementation ShowTest - (void)testShowCreate { Show *s = [[Show alloc] init]; GHAssertNotNil(s,@"Was nil."); } @end However when I try to build and run my tests it moans with this error: - Undefined symbols: "_OBJC_CLASS_$_Show", referenced from: __objc_classrefs__DATA@0 in ShowTest.o ld: symbol(s) not found collect2: ld returned 1 exit status Now I'm presuming this is a linking error. I tried following every step in the instructions located here: - http://github.com/gabriel/gh-unit/blob/master/README.md And step 2 of these instructions confused me: - In the Target 'Tests' Info window, General tab: Add a linked library, under Mac OS X 10.5 SDK section, select GHUnit.framework Add a linked library, select your project. Add a direct dependency, and select your project. (This will cause your application or framework to build before the test target.) How am I supposed to add my project to the linked library list when all it accepts it .dylib, .framework and .o files. I'm confused! Thanks for any help that is received.

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• Lost Update Anomaly in Sql Server Update Command

  - by Javed

  Hi, I am very much confused. I have a transaction in ReadCommitted Isolation level. Among other things I am also updating a counter value in it, something similar to below: Update tblCount set counter = counter + 1 My application is a desktop application and this transaction happens to occur quite frequently and concurrently. We recently noticed an error that sometimes the counter value doesn't get updated or is missed. We also insert one record on each counter update so we are sure that records have been inserted but somehow counter fails to update. This happens once in 2000 simulaneous transactions. I seriously doubt it is a lost update anomaly I am facing but if you look at the command above, it's just update the counter from its own value: if I have started a transaction and the transaction has reached this statement, it should have locked the row. This should not cause lost update, but it's happening somehow. Is the thing that this update command works in two parts? Like first it reads the counter value (during which it doesn't get the exclusive lock) and then writes the new calculated value (when it does get an exclusive lock)? Please help, I have got really confused.

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• Google Federated Login vs Hybrid Protocol vs Google Data Authentication. Whats's the Difference?

  - by johnfelix

  Hi, I am trying to implement Google Authentication in my website, in which I would also be pulling some Google Data using the Google Data API and I am using Google App Engine with Jinja2. My question is, so many ways are mentioned to do it. I am confused between Google Federated Login,Google Data Protocol, Hybrid Protocol. Are these things the same or different ways to do the same thing. From what I read and understood, which might be incorrect, Google Federated Login uses the hybrid protocol to authenticate and fetch the google data. Is there a proper guide to implement any one of these in python. Examples which I found at the google link are kind of different. From what I understood,correct me if i am wrong, I have to implement only the OpenID Consumer part. In order to implement Google Federated Login in Python, I saw that we need to download a separate library from the openid-enabled.com but I found a different library for the google data implementation at http://code.google.com/p/gdata-python-client/ As you can see, I am confused a lot :D. Please help me :) Thanks

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