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• GLSL Shader Effects: How to do motion blur, etc?

  - by DevilWithin

  I am not sure how right it is to ask this question, but still here it goes. I have a full 2D environment, with sprites going around as landscape, characters, etc And to make it more state-of-art looking, i want to implement a motion blur effect, similar to modern FPS's (i.e. crysis) blur when moving fast the camera. In a sidescroller, the desired effect is having this slight blur appearing to give the idea of fast movement, when the camera is moving. If anyone could give me some tips on doing this, im assuming in a pixel shader, i'd be grate. Also, if anyone has other good tips on cool pixel shader effects for 2D games it would be awesome, like some stylizing post fx, such as previous Prince of Persia illustrative style. Thanks

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• Network icon shows an Internet connection, while ping does not

  - by mushfiq

  I am an Ubuntu user for the last couple of years. Recently facing problem to connect my new laptop into the Internet. I have an ISP connection which provide me a NAT address. I changed all the information in network configuration.The network icon shows it is connected to Internet but when I browse, ping shows no Internet connection. /etc/network/interfaces look like this: auto eth0 iface eth0 inet static address 192.168.100.118(put you internet address provided by the ISP) gateway 192.168.100.1(gateway address) netmask 255.255.255.0 network 192.168.100.0 And when I ping my DNS server IP get the reply from DNS server. I can not understand the problem,it should be mentioned that I also changed the Physical address of my laptop for using the existing connection. In windows the connection is working fine. Any suggestion in this question will help me a lot. Thanks in advance.

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• How to create a KDE start application menu launcher that launches the search and launch desktop?

  - by davorao

  Now i love the plasma-netbook aka the "search and launch" interface but i would want to be able to have it appear on demand and not sit as the desktop default in the back of my windows. So what i imagine is having a application launcher be created which on activation brings up the "search and launch" feature allowing for easy access of your favorites or have that slick interface to find what your looking for. I'm aware that krunner solves a similar use-case but search and launch would be more of an Unity Dash type of search, whereas krunner is more useful when u exactly know what your looking for. And to summarize my question, since I'm clueless as to how this would be done, I'm lookinf for someone who could tell me how hard it would be to do it.

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• Why are people using C instead of C++? [closed]

  - by Darth

  Possible Duplicate: When to use C over C++, and C++ over C? Many times I've stumbled upon people saying that C++ is not always better than C. Great example here would be the Linux kernel, where they simply decided to use C instead of C++ because it had better compilers at the time. But that's many years ago and a lot has changed. So the question is, why are people still using C over C++? I gues there are probably some cases (like embedded devices), where there simply isn't a good C++ compiler, or am I wrong here? What are the other cases when it is better to go with C instead of C++?

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• Teaching programming (languages) in central/northern Europe

  - by canavanin

  I hope this question is not going to be off-topic; in case you think there'd be a better place to ask it, please let me know. Anyway, I'm currently doing my PhD working in bioinformatics. I would, however, like to turn away from academia eventually and instead go into teaching programming or, preferably, programming languages (e.g. Perl, which feels like my "mother tongue"...) - not as a school teacher, but with a company (in Germany or Scandinavia). It'll take me another one to one and a half years to complete my PhD, so I would like to know how I could/should use that time to raise my chances of getting into the profession I'd be interested in. Are there any Perl certificates I should aim to obtain, for example? In case there's anything that comes to mind when reading this, please let me know. Thanks a lot in advance!

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• How do you handle measuring Code Coverage in JavaScript

  - by Dancrumb

  In order to measure Code Coverage for JavaScript unit tests, one needs to instrument the code, run the tests and then perform post-processing. My concern is that, as a result, you are unit testing code that will never be run in production. Since JavaScript isn't compiled, what you test should be precisely what you execute. So here's my question, how do you handle this? One thought I had was to run Unit Testing on the production code and use that for my pass fail. I would then create a shadow of my production code, with instrumentation and run my unit tests again; this would give me my code coverage stats. Has anyone come across a method that is a little more graceful than this?

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• Rationale behind freeware projects

  - by VexXtreme

  I've seen some freeware projects in the past where the author(s) invested a significant amount of their personal time and resources and never even considered charging for the software. A lot of these projects were donation based, and from what I've heard, donationware can never be a viable business model (even to simply support development costs) because most people choose not to donate if given an option. A lot of these projects eventually shut down because their authors could not sustain them further. Granted, some people simply like making the community happy (or something), but if you're struggling to keep your project alive, why not charge some small amount such as $10 simply to stay operational? If people find your software useful (and a lot of people found those projects VERY useful) they won't have a problem paying such a small amount. The question is: if you have a popular app that people like and download in great numbers, why not put a price tag on it? Why do it for free?

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• Email links open in a new window [closed]

  - by Dan

  I'm asking this as an opinion question. How does everyone treat email links opening in a new window if their default email client is web based? This way? <a href="mailto:[email protected]">email me</a>. It will open fine for app based email clients but open in the same window for web based clients. This way? <a href="mailto:[email protected]" target="_blank">email me</a>. It will open in a new tab for web based email clients but open a blank tab. I cant really seem to find the best of both worlds. What does everyone else do?

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• Recommended reading for (Object Oriented) application design architecture?

  - by e4rthdog

  In life it doesnt matter if you do one thing for 15 years. You will end up waking one day and asking stuff that are equal to "how do i walk?" :) My specific question is that as a new entrant to C# and OOP i am stepping into many little "details" that need to be addressed. Written a lot of code in VB.NET / cobol / simple php e.t.c surely does not help much into the OOP world... So , even after reading entry level books for C# and watching some videos i recently found out about the "factory model design" for applications. I would appreciate if any of you guys recomment some reading on application design architecture for further reading...

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• VPN no longer works, saves old password?

  - by nathanvda

  I am not sure if this question is related to 11.10 or gnome 3.2, but the VPN configuration screen has changed, and now the user and password is optional, but there is no way for me to override it. On our VPN we use a token, so I have to enter the password each time. But even if I clear the password, clear the password and the user, there is no way for me to unset the user and password, so I am unable to access the VPN. Because he never asks the password anymore, and each time I return to the VPN configuration window, I see the same setting. Please help. Is there another way to configure the VPN? [Found Quick Fix] Recreate the VPN connection, fill everything in but the password, and this will work the first time.

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• Is "code that generates code" really all that great?

  - by Jaxo

  I was looking through CodePen's "popular pens" and I noticed this cool little spiral animation somebody made with a seemingly ridiculously small amount of code. This is quite impressive until you click the headings for HTML and CSS to show the "compiled" versions of the same code. Suddenly the 3 lines of HAML and ~40 lines of SCSS turns into a gigantic monster of repetition. Here's where my question comes in: Is it acceptable to do something like this in practice? Don't get me wrong - I love using preprocessors to help me write code faster, but in some cases it looks like it's an automatic copy-paste machine.

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• about ubuntu upgrade for version 11.02

  - by Mr Myo MIn Hein

  In my Ubuntu version, I cannot get the essence of Ubuntu because my version is low. Most of the software cannot be used and some command are not really working. My 300GB HDD is not found. My primary HDD is 750GB, and has Windows 7 and Ubuntu on it in dual-boot. On Windows, a 450GB HDD for storage is found. The next question is about my launcher. It is not on the left side, so I cannot use it efficiently because it is in one third of my desktop.

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• vdpau on Ubuntu 13.10 and mesa 9.2.1

  - by fioan89

  I've just installed Ubuntu 13.10. I have a Radeon HD 4570 card and I want to use the hardware acceleration capabilities that were introduced with linux 3.10 in the mesa 9.2 So my question is: since I have a linux 3.11 and mesa 9.2, do I really need to compile the mesa library with --enable-vdpau option enabled? I have installed the libvdpau from the repository but no acceleration. Should I compile and then install the latest mesa(I don't want to mess my newly installed Ubuntu 3.10)? Thanks!

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• Export Foxbase database tables to csv

  - by RKS

  I have no experience with Foxbase whatsoever and I'm used to working with MySQL via phpmyadmin or interfaces like that. My company has a third party database we're trying to move away from, but we have no support from the company. The database is on our servers, but in a foxbase format. What kind tools do I need to convert these into other formats, or is there any type of admin UI I can tell them to use to export to csv or anything like that? Basically I'm asking how to export the foxbase tables to csv. Sorry if this question isn't clear or you need more information. I will edit with anything else you need.

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• How to fix an annoying ReSharper &ndash; NuGet error

  - by terje

  Originally posted on: http://geekswithblogs.net/terje/archive/2013/10/30/how-to-fix-an-annoying-resharper-ndash-nuget-error.aspxUsing NuGet in Visual Studio together with ReSharper may sometimes lead you into an annoying error where ReSharper indicates your code has an error, but the solution builds just fine. This may happen if you have a set of NuGet packages, and you either just restore them, or delete them on disk and then restore again.  Your code ends up looking like this, note the red missing functions, which comes from the Moq library - which is downloaded from NuGet:   while the Build is still fine, it compiles without any errors: This stackoverflow question gives some different approaches to solve this, but my experience have been that the Resharper Suspend-Resume trick most often solves the issue: In Visual Studio:  Go to Tools/Options/Resharper Press Suspend: When this is done the error markers disappear, since ReSharper now is inactive. Then just press Resume again: This has been submitted to Jetbrains support, ticket here: http://resharper-support.jetbrains.com/requests/3882) , if you want to follow it.

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• Identity verification

  - by acjohnson55

  On a site that I'm working on, I'm trying to find ways of enforcing a one-person, one-account rule. In general, we'd like to do this by providing options to authenticate users with third-party services that provide this assurance. For example, it's possible to authenticate with Facebook and check whether the user is considered "verified" by Facebook (which means they must have provided either a phone number or credit card). This is roughly the level of identity verification we require--we're not doing banking or anything like that. But we want to give the user options. My question is, who else, besides Facebook, provides this? (uncertain of the proper SE forum, please comment if there's a better SE site to ask this)

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• Attachment handling for web application with Jackrabbit

  - by Andrea Girardi

  I need to manage attachments on my Spring web application and I thought to use an open source repository. My app it's a job approval system using J2EE / SPRING 3 Framework and Postgress DB to allow user to tracks the job,right through every step of the approval process. It is a fully managed, collaborative system that operates from a central server and is accessed by a standard internet browser. An user should be able to add an attach to a request or an approval step, so, I though to use Jackrabbit with Postgres database persistence manager. I took a look to this post: http://onjava.com/pub/a/onjava/2006/10/04/what-is-java-content-repository.html?page=1 It's really interesting but, I've some question about this kind of solution :- I seen that Jackrabbit standalone as a Derby database embedded solution for persistence, is it enough for a professional use of the repository with more than 50 request / days (with attachment) ? Is there a reason for which I should use another database manager for persistence instead of the default one ?

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• Remote Desktop Viewer Set-up for 12.10

  - by Sir Linuxalot

  How do you set up the Remote Desktop in 12.10? I've scanned the available answers here and didn't find anything that answers the question considering the 12.10 interface. Specifically, advice says to check the "Allow Others to Control Your Desktop" and an IP will pop up (10.04 I believe). But when checking this in Quezal no IP shows. So how would I connect to my desktop from somewhere other than the local network, like say a coffee house? I also see this Remmina client program but have no idea if I need to use that as well. Can someone give me a step-by-step or point me to one that I haven't found yet? Thanks.

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• Is there a good book to grok C++?

  - by Paperflyer

  This question got me thinking. I would say I am a pretty experienced C++ programmer. I use it a lot at work, I had some courses on it at the university, I can understand most C++ code I find out there without problems. Other languages you can pretty much learn by using them. But every time I use a new C++ library or check out some new C++ code by someone I did not know before, I discover a new set of idioms C++ has to offer. Basically, this has lead me to believe that there is a lot of stuff in C++ that might be worth knowing but that is not easily discoverable. So, is there a good book for a somewhat experienced C++ programmer to step up the game? You know, to kind of 'get' that language the way you can 'get' Ruby or Objective-C, where everything just suddenly makes sense and you start instinctively knowing 'that C++ way of thing'?

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• Should I be using WAI-ARIA in my HTML website builds?

  - by DBUK

  Should I be using WAI-ARIA in my website builds? Will it have any benefit? Is anyone adding 'role' to their code at the moment? The tab, link, checkbox and slider roles, plus many more, aren't available yet for HTML5. From looking at the list of what is available (see below), and what will be coming in the future, it looks like we might be applying roles to a huge amount of tags on our pages. Its not an issue especially if it brings benefit to users using readers etc Also, a side question, will search engines give any benefits to sites using WAI-ARIA? List of safe roles to use (I think) • role="article" • role="banner" • role="complementary" • role="contentinfo" • role="form" • role="heading" • role="main" • role="navigation" • role="search" Examples of usage: <header role="banner"></div>for a main header, banner only allowed once per page <header role="heading"></div>- for all headers after the main one <aside role="complementary"></aside> <form role="search"></form>

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• Is ORM an Anti-Pattern?

  - by derphil

  I had a very stimulating and interessting discussion with a colleague about ORM and it's Pros and Cons. In my opinion, an ORM is useful only in the rarest cases. At least in my experience. But I don't want to list my own arguments at this time. So I ask you, what do you think about ORM? What are the Pros and the Cons? P.S. I've posted this "question" yesterday on Stackoverflow, but some of the user think, that this should better posted here.

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• Reasons for either 32-bit or 64-bit as development machine

  - by vartec

  I'm about to make a new Linux install, which will be primarily used for programming. I've seen benchmarks showing speed improvement of 64-bit version, however, I have hard time of telling how much these benchmarks translate to improvement in every day usage. And of course there are other aspects to consider. Usage I have in mind: mainly programming Python, with occasional C, C++ and Java; IDEs, which are using Java platforms (Eclipse and IntelliJ); on very rare occasions having to compile for 32-bit platform; not planning to have more than 64GB of RAM anytime soon (and I don't mind using PAE kernels); machine in question has 4GB RAM and Athlon II X2; What are pros and cons of choosing either i386 or x86_64 distro?

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• Black Hat Hackers vs Programmers?

  - by Matt Ridge

  This came up with another question I had here, I have decided on a programming verification system that requires a hardware verification system, a software key, and a name/password system. Now people are saying that hackers will bypass any new security, which may be true, but I have a few questions. There has to be a balance between programmers programming and hackers stealing software, otherwise programs wouldn’t be made, and we wouldn’t be where we are today. What is that balance? 5%, 10%, 20%, 50%? What is too much security for the end user? What is too little security so the hacker can just push through without issue? If your software becomes popular, what should you expect or accept as acceptable loss? Why should we accept black hat hackers as a way of life?

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• Erlang web frameworks survey

  - by Zachary K

  (Inspired by similar question on Haskel) There are several web frameworks for Erlang like Nitrogen, Chicago Boss, and Zotonic, and a few more. In what aspects do they differ from each other? For example: features (e.g. server only, or also client scripting, easy support for different kinds of database) maturity (e.g. stability, documentation quality) scalability (e.g. performance, handy abstraction) main targets Also, what are examples of real-world sites / web apps using these frameworks? EDIT: Starting a bounty in hopes that it will get some conversation going

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• How to properly add texture to multi-fixture/shape b2Body

  - by Blazej Wdowikowski

  Hello to everyone this is my first poste here I hope that will be not fail start. At start I must say I make part 1 in Ray's Tutorial "How To Make A Game Like Fruit Ninja With Box2D and Cocos2D". But I wonder what when I want make more complex body with texture? Simple just add n b2FixtureDef to the same body. OK but what about texture? If I will take code from that tutorial it only fill last fixture. Probably it does not takes every b2Vec2 point. I was right, it did not. So quick refactor and from that -(id)initWithTexture:(CCTexture2D*)texture body:(b2Body*)body original:(BOOL)original { // gather all the vertices from our Box2D shape b2Fixture *originalFixture = body->GetFixtureList(); b2PolygonShape *shape = (b2PolygonShape*)originalFixture->GetShape(); int vertexCount = shape->GetVertexCount(); NSMutableArray *points = [NSMutableArray arrayWithCapacity:vertexCount]; for(int i = 0; i < vertexCount; i++) { CGPoint p = ccp(shape->GetVertex(i).x * PTM_RATIO, shape->GetVertex(i).y * PTM_RATIO); [points addObject:[NSValue valueWithCGPoint:p]]; } if ((self = [super initWithPoints:points andTexture:texture])) { _body = body; _body->SetUserData(self); _original = original; // gets the center of the polygon _centroid = self.body->GetLocalCenter(); // assign an anchor point based on the center self.anchorPoint = ccp(_centroid.x * PTM_RATIO / texture.contentSize.width, _centroid.y * PTM_RATIO / texture.contentSize.height); } return self; } I came up with that -(id)initWithTexture:(CCTexture2D*)texture body:(b2Body*)body original:(BOOL)original { int vertexCount = 0; //gather total number of b2Vect2 points b2Fixture *currentFixture = body->GetFixtureList(); while (currentFixture) { //new b2PolygonShape *shape = (b2PolygonShape*)currentFixture->GetShape(); vertexCount += shape->GetVertexCount(); currentFixture = currentFixture->GetNext(); } NSMutableArray *points = [NSMutableArray arrayWithCapacity:vertexCount]; // gather all the vertices from our Box2D shape b2Fixture *originalFixture = body->GetFixtureList(); while (originalFixture) { //new NSLog((NSString*)@"-"); b2PolygonShape *shape = (b2PolygonShape*)originalFixture->GetShape(); int currentVertexCount = shape->GetVertexCount(); for(int i = 0; i < currentVertexCount; i++) { CGPoint p = ccp(shape->GetVertex(i).x * PTM_RATIO, shape->GetVertex(i).y * PTM_RATIO); [points addObject:[NSValue valueWithCGPoint:p]]; } originalFixture = originalFixture->GetNext(); } if ((self = [super initWithPoints:points andTexture:texture])) { _body = body; _body->SetUserData(self); _original = original; // gets the center of the polygon _centroid = self.body->GetLocalCenter(); // assign an anchor point based on the center self.anchorPoint = ccp(_centroid.x * PTM_RATIO / texture.contentSize.width,_centroid.y * PTM_RATIO / texture.contentSize.height); } return self; } I was working for simple two fixtures body like b2BodyDef bodyDef; bodyDef.type = b2_dynamicBody; bodyDef.position = position; bodyDef.angle = rotation; b2Body *body = world->CreateBody(&bodyDef); b2FixtureDef fixtureDef; fixtureDef.density = 1.0; fixtureDef.friction = 0.5; fixtureDef.restitution = 0.2; fixtureDef.filter.categoryBits = 0x0001; fixtureDef.filter.maskBits = 0x0001; b2Vec2 vertices[] = { b2Vec2(0.0/PTM_RATIO,50.0/PTM_RATIO), b2Vec2(0.0/PTM_RATIO,0.0/PTM_RATIO), b2Vec2(50.0/PTM_RATIO,30.1/PTM_RATIO), b2Vec2(60.0/PTM_RATIO,60.0/PTM_RATIO) }; b2PolygonShape shape; shape.Set(vertices, 4); fixtureDef.shape = &shape; body->CreateFixture(&fixtureDef); b2Vec2 vertices2[] = { b2Vec2(20.0/PTM_RATIO,50.0/PTM_RATIO), b2Vec2(20.0/PTM_RATIO,0.0/PTM_RATIO), b2Vec2(70.0/PTM_RATIO,30.1/PTM_RATIO), b2Vec2(80.0/PTM_RATIO,60.0/PTM_RATIO) }; shape.Set(vertices2, 4); fixtureDef.shape = &shape; body->CreateFixture(&fixtureDef); But if I try put secondary shape upper than first it starting wierd, texture goes crazy. For example not mention about more complex shapes. What's more if shapes have one common point texture will not render for them at all [For that I use Physics Edytor like in tutorial part1] BTW. I use PolygonSprite and in method createWithWorld... another shapes. Uff.. Question So my question is, why texture coords are in such a mess up? It's my modify method or just wrong approach? Maybe I should remove duplicated from points array?

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