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• Where can I find a powerful, standards compliant, web-based interactive org chart API?

  - by Adam Soltys

  Hi, I'm looking to build an interactive web-based org chart for a large organization. I somewhat like the interface at ancestry.com where you can hover over people and pan/zoom around and click on different nodes to make them the root. Ideally, I'd like it if people could belong to multiple organizational entities like committees, working groups, etc. In other words the API should support graphs in general, not just trees. I'd like to be able to visually explode each organizational substructure into substituents by clicking on it, with a nice animation of the employees ballooning or spilling out so you can really interactively drill down through the organization. I found http://code.google.com/apis/visualization/documentation/gallery/orgchart.html but it looks a bit rudimentary. I know there are desktop tools like OrgPlus and Visio that can build static charts but I'm really looking for a free, web-based API with open standards-based output like SVG or HTML5 Canvas elements rather than Flash or some proprietary output. Something I can embed into a custom web application and style myself. Something interactive.

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• Why do I get this error when I try to push my SQLite3 to Postgresql (via Taps) on Cedar Stack?

  - by rhodee

  I've done quite a bit of research on Heroku Dev Center and I am now looking to the community for help. Here is my problem. I can not push my db to Heroku Cedar Stack. I am trying to migrate a sqlite database to postgresql via Taps gem. When I am ready to deploy I run: bundle install --without production heroku run db:push I get the following result: Running db:seed attached to terminal... up, run.17 sh: db:seed: not found heroku run rake db:migrate And when I run the migration: heroku run rake db:migrate I get the following: Running rake db:migrate attached to terminal... up, run.18 rake aborted! No Rakefile found (looking for: rakefile, Rakefile, rakefile.rb, Rakefile.rb) /usr/local/lib/ruby/1.9.1/rake.rb:2367:in `raw_load_rakefile' /usr/local/lib/ruby/1.9.1/rake.rb:2007:in `block in load_rakefile' /usr/local/lib/ruby/1.9.1/rake.rb:2058:in `standard_exception_handling' /usr/local/lib/ruby/1.9.1/rake.rb:2006:in `load_rakefile' /usr/local/lib/ruby/1.9.1/rake.rb:1991:in `run' /usr/local/bin/rake:31:in `<main>' Everytime I push to Heroku (git push heroku master) it fails because my gem file is attempting to install sqlite3 gem-even though its inside of the development and test groups in my Gemfile. My database.yml production environment still points to sqlite adapter even after I have run the following command successfully: heroku config:add BUNDLE_WITHOUT="test development" --app app_name_on_heroku Out of ideas. Please help. If its useful I can post results of my gemfile, heroku ps and logs. Cheers UPDATE: After following @John's direction I now receive the following terminal message. Sending schema Schema: 100% |==========================================| Time: 00:00:07 Sending indexes schema_migrat: 100% |==========================================| Time: 00:00:00 Sending data 4 tables, 6 records schema_migrat: 0% | | ETA: --:--:-- Saving session to push_201111070749.dat.. !!! Caught Server Exception HTTP CODE: 500 Taps Server Error: LoadError: no such file to load -- sequel/adapters/ And the following warnings: ["/app/.bundle/gems/ruby/1.9.1/gems/sequel-3.20.0/lib/sequel/core.rb:249:in require'", "/app/.bundle/gems/ruby/1.9.1/gems/sequel-3.20.0/lib/sequel/core.rb:249:inblock in tsk_require'", "/app/.bundle/gems/ruby/1.9.1/gems/sequel-3.20.0/lib/sequel/core.rb:72:in block in check_requiring_thread'", "<internal:prelude>:10:insynchronize'", "/app/.bundle/gems/ruby/1.9.1/gems/sequel-3.20.0/lib/sequel/core.rb:69:in check_requiring_thread'", "/app/.bundle/gems/ruby/1.9.1/gems/sequel-3.20.0/lib/sequel/core.rb:249:intsk_require'", "/app/.bundle/gems/ruby/1.9.1/gems/sequel-3.20.0/lib/sequel/database/connecting.rb:25:in adapter_class'", "/app/.bundle/gems/ruby/1.9.1/gems/sequel-3.20.0/lib/sequel/database/connecting.rb:54:inconnect'", "/app/.bundle/gems/ruby/1.9.1/gems/sequel-3.20.0/lib/sequel/core.rb:119:in connect'", "/app/lib/taps/db_session.rb:14:inconn'", "/app/lib/taps/server.rb:91:in block in <class:Server>'", "/app/.bundle/gems/ruby/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:865:incall'", "/app/.bundle/gems/ruby/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:865:in block in route'", "/app/.bundle/gems/ruby/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:521:ininstance_eval'", "/app/.bundle/gems/ruby/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:521:in route_eval'", "/app/.bundle/gems/ruby/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:500:inblock (2 levels) in route!'", "/app/.bundle/gems/ruby/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:497:in catch'", "/app/.bundle/gems/ruby/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:497:inblock in route!'", "/app/.bundle/gems/ruby/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:476:in each'", "/app/.bundle/gems/ruby/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:476:inroute!'", "/app/.bundle/gems/ruby/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:601:in dispatch!'", "/app/.bundle/gems/ruby/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:411:inblock in call!'", "/app/.bundle/gems/ruby/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:566:in instance_eval'", "/app/.bundle/gems/ruby/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:566:inblock in invoke'", "/app/.bundle/gems/ruby/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:566:in catch'", "/app/.bundle/gems/ruby/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:566:ininvoke'", "/app/.bundle/gems/ruby/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:411:in call!'", "/app/.bundle/gems/ruby/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:399:incall'", "/app/.bundle/gems/ruby/1.9.1/gems/rack-1.2.1/lib/rack/auth/basic.rb:25:in call'", "/app/.bundle/gems/ruby/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:979:inblock in call'", "/app/.bundle/gems/ruby/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:1005:in synchronize'", "/app/.bundle/gems/ruby/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:979:incall'", "/home/heroku_rack/lib/static_assets.rb:9:in call'", "/home/heroku_rack/lib/last_access.rb:15:incall'", "/app/.bundle/gems/ruby/1.9.1/gems/rack-1.2.1/lib/rack/urlmap.rb:47:in block in call'", "/app/.bundle/gems/ruby/1.9.1/gems/rack-1.2.1/lib/rack/urlmap.rb:41:ineach'", "/app/.bundle/gems/ruby/1.9.1/gems/rack-1.2.1/lib/rack/urlmap.rb:41:in call'", "/home/heroku_rack/lib/date_header.rb:14:incall'", "/app/.bundle/gems/ruby/1.9.1/gems/rack-1.2.1/lib/rack/builder.rb:77:in call'", "/app/.bundle/gems/ruby/1.9.1/gems/thin-1.2.7/lib/thin/connection.rb:76:inblock in pre_process'", "/app/.bundle/gems/ruby/1.9.1/gems/thin-1.2.7/lib/thin/connection.rb:74:in catch'", "/app/.bundle/gems/ruby/1.9.1/gems/thin-1.2.7/lib/thin/connection.rb:74:inpre_process'", "/app/.bundle/gems/ruby/1.9.1/gems/thin-1.2.7/lib/thin/connection.rb:57:in process'", "/app/.bundle/gems/ruby/1.9.1/gems/thin-1.2.7/lib/thin/connection.rb:42:inreceive_data'", "/app/.bundle/gems/ruby/1.9.1/gems/eventmachine-0.12.10/lib/eventmachine.rb:256:in run_machine'", "/app/.bundle/gems/ruby/1.9.1/gems/eventmachine-0.12.10/lib/eventmachine.rb:256:inrun'", "/app/.bundle/gems/ruby/1.9.1/gems/thin-1.2.7/lib/thin/backends/base.rb:57:in start'", "/app/.bundle/gems/ruby/1.9.1/gems/thin-1.2.7/lib/thin/server.rb:156:instart'", "/app/.bundle/gems/ruby/1.9.1/gems/thin-1.2.7/lib/thin/controllers/controller.rb:80:in start'", "/app/.bundle/gems/ruby/1.9.1/gems/thin-1.2.7/lib/thin/runner.rb:177:inrun_command'", "/app/.bundle/gems/ruby/1.9.1/gems/thin-1.2.7/lib/thin/runner.rb:143:in run!'", "/app/.bundle/gems/ruby/1.9.1/gems/thin-1.2.7/bin/thin:6:in'", "/usr/ruby1.9.2/bin/thin:19:in load'", "/usr/ruby1.9.2/bin/thin:19:in'"]

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• How do I stack images to simulate depth using Core Animation?

  - by Jeffrey Berthiaume

  I have a series of UIImages with which I need to simulate depth. I can't use scaling because I need to be able to rotate the parent view, and the images should look like they're stacked visibly in front of each other, not on the same plane. I made a new ViewController-based project and put this in the viewDidLoad (as well as attached three 120x120 pixel images named 1.png, 2.png, and 3.png): - (void)viewDidLoad { // display image 3 UIImageView *three = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"3.png"]]; three.center = CGPointMake(160 + 60, 240 - 60); [self.view addSubview:three]; // rotate image 3 around the z axis // THIS IS INCORRECT CATransform3D theTransform = three.layer.transform; theTransform.m34 = 1.0 / -1000; three.layer.transform = theTransform; // display image 2 UIImageView *two = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"2.png"]]; two.center = CGPointMake(160, 240); [self.view addSubview:two]; // display image 1 UIImageView *one = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"1.png"]]; one.center = CGPointMake(160 - 60, 240 + 60); [self.view addSubview:one]; // rotate image 3 around the z axis // THIS IS INCORRECT theTransform = one.layer.transform; theTransform.m34 = 1.0 / 1000; one.layer.transform = theTransform; // release the images [one release]; [two release]; [three release]; // rotate the parent view around the y axis theTransform = self.view.layer.transform; theTransform.m14 = 1.0 / -500; self.view.layer.transform = theTransform; [super viewDidLoad]; } I have very specific reasons why I'm not using an EAGLView and why I'm not loading the images as CALayers (i.e. why I'm using UIImageViews for each one). This is just a quick demo that I can use to work out exactly what I need in my parent application. Is there some matrix way to translate these 2d images along the z-axis so they will look like what I'm trying to represent? I've gone through the other StackOverflow articles as well as the Wikipedia references, and have not found what I'm looking for -- although I might not necessarily be using the right terms for what I'm trying to do.

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• Is it reasonable to expect knowing the whole stack bottom up?

  - by Vaibhav Garg

  I am an Sr. developer/architect/Product Manager for embedded systems. The systems that I have had experience with have typically been small to medium size codebases - typically close to 25-30K LOC in C, using 8-16 and 32 bit low end microcontrollers. The systems have been entirely bootstrapped by our team - meaning right from the start-up code to the end application code has either been written by the team, or at the very least, is thoroughly understood and maintained by us. Now, if we were to start developing more complex systems with complex peripherals, such as USB OTG et al. (think, low end cell phones), there are libraries and stacks available commercially and from chip vendors that reduce the task to just calling the right APIs and being able to use those peripherals. Now, from a habit point of view, this does not give me and the team a comfortable feeling, not being able to comprehend the entire code tree, with virtual black boxes at the lower layers. Is it reasonable to devote, and reserve, time getting into the details of how the APIs are implemented, assuming that the same would also entail getting into details of relevant standards (again, for USB as an example)? Or, alternatively, should a thorough understanding of the top level usage of the APIs be sufficient? This of course assumes that the source codes to all libraries are available, which they are, in almost all cases. Edit: In partial response to @Abhi Beckert, the documentation is refreshingly very comprehensive and meticulously maintained, AFAIK and been able to judge. I have not had a long experience with the same.

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• How to create a Semantic Network like wordnet based on Wikipedia?

  - by Forbidden Overseer

  I am an undergraduate student and I have to create a Semantic Network based on Wikipedia. This Semantic Network would be similar to Wordnet(except for it is based on Wikipedia and is concerned with "streams of text/topics" rather than simple words etc.) and I am thinking of using the Wikipedia XML dumps for the purpose. I guess I need to learn parsing an XML and "some other things" related to NLP and probably Machine Learning, but I am no way sure about anything involved herein after the XML parsing. Is the starting step: XML dump parsing into text a good idea/step? Any alternatives? What would be the steps involved after parsing XML into text to create a functional Semantic Network? What are the things/concepts I should learn in order to do them? I am not directly asking for book recommendations, but if you have read a book/article that teaches any thing related/helpful, please mention them. This may include a refernce to already existing implementations regarding the subject. Please correct me if I was wrong somewhere. Thanks!

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• How to balance a non-symmetric "extension" based game?

  - by Klaim

  Most strategy games have fixed units and possible behaviours. However, think of a game like Magic The Gathering : each card is a set of rules. Regularly, new sets of card types are created. I remember that the firsts editions of the game have been said to be prohibited in official tournaments because the cards were often too powerful. Later extensions of the game provided more subtle effects/rules in cards and they managed to balance the game apparently effectively, even if there is thousands of different cards possible. I'm working on a strategy game that is a bit in the same position : every units are provided by extensions and the game is thought to be extended for some years, at least. The effects variety of the units are very large even with some basic design limitations set to be sure it's manageable. Each player choose a set of units to play with (defining their global strategy) before playing (like chooseing a themed deck of Magic cards). As it's a strategy game (you can think of Magic as a strategy game too in some POV), it's essentially skirmish based so the game have to be fair, even if the players don't choose the same units before starting to play. So, how do you proceed to balance this type of non-symmetric (strategy) game when you know it will always be extended? For the moment, I'm trying to apply those rules but I'm not sure it's right because I don't have enough design experience to know : each unit would provide one unique effect; each unit should have an opposite unit that have an opposite effect that would cancel each others; some limitations based on the gameplay; try to get a lot of beta tests before each extension release? Looks like I'm in the most complex case?

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• GLSL, is it possible to offsetting vertices based on height map colour?

  - by Rob

  I am attempting to generate some terrain based upon a heightmap. I have generated a 32 x 32 grid and a corresponding height map - In my vertex shader I am trying to offset the position of the Y axis based upon the colour of the heightmap, white vertices being higher than black ones. //Vertex Shader Code #version 330 uniform mat4 modelMatrix; uniform mat4 viewMatrix; uniform mat4 projectionMatrix; uniform sampler2D heightmap; layout (location=0) in vec4 vertexPos; layout (location=1) in vec4 vertexColour; layout (location=3) in vec2 vertexTextureCoord; layout (location=4) in float offset; out vec4 fragCol; out vec4 fragPos; out vec2 fragTex; void main() { // Retreive the current pixel's colour vec4 hmColour = texture(heightmap,vertexTextureCoord); // Offset the y position by the value of current texel's colour value ? vec4 offset = vec4(vertexPos.x , vertexPos.y + hmColour.r, vertexPos.z , 1.0); // Final Position gl_Position = projectionMatrix * viewMatrix * modelMatrix * offset; // Data sent to Fragment Shader. fragCol = vertexColour; fragPos = vertexPos; fragTex = vertexTextureCoord; } However the code I have produced only creates a grid with none of the y vertices higher than any others.

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• What Programming languages/technologies stack to use when building Facebook like website ?

  - by Blaze Boy

  I'm developing a website idea that will perform the same as Facebook functionality without the applications extensibility. the site will have a client application to perform a task similar to dropbox.com the site will be a social network of some sort of professionalism, it will highlight code of almost all languages has a high speed backend database Now what languages/techniques do I need to use to achieve that?

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• Why not have a High Level Language based OS? Are Low Level Languages more efficient?

  - by rtindru

  Without being presumptuous, I would like you to consider the possibility of this. Most OS today are based on pretty low level languages (mainly C/C++) Even the new ones such as Android uses JNI & underlying implementation is in C In fact, (this is a personal observation) many programs written in C run a lot faster than their high level counterparts (eg: Transmission (a bittorrent client on Ubuntu) is a whole lot faster than Vuze(Java) or Deluge(Python)). Even python compilers are written in C, although PyPy is an exception. So is there a particular reason for this? Why is it that all our so called "High Level Languages" with the great "OOP" concepts can't be used in making a solid OS? So I have 2 questions basically. Why are applications written in low level languages more efficient than their HLL counterparts? Do low level languages perform better for the simple reason that they are low level and are translated to machine code easier? Why do we not have a full fledged OS based entirely on a High Level Language?

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• How to do dependency Injection and conditional object creation based on type?

  - by Pradeep

  I have a service endpoint initialized using DI. It is of the following style. This end point is used across the app. public class CustomerService : ICustomerService { private IValidationService ValidationService { get; set; } private ICustomerRepository Repository { get; set; } public CustomerService(IValidationService validationService,ICustomerRepository repository) { ValidationService = validationService; Repository = repository; } public void Save(CustomerDTO customer) { if (ValidationService.Valid(customer)) Repository.Save(customer); } Now, With the changing requirements, there are going to be different types of customers (Legacy/Regular). The requirement is based on the type of the customer I have to validate and persist the customer in a different way (e.g. if Legacy customer persist to LegacyRepository). The wrong way to do this will be to break DI and do somthing like public void Save(CustomerDTO customer) { if(customer.Type == CustomerTypes.Legacy) { if (LegacyValidationService.Valid(customer)) LegacyRepository.Save(customer); } else { if (ValidationService.Valid(customer)) Repository.Save(customer); } } My options to me seems like DI all possible IValidationService and ICustomerRepository and switch based on type, which seems wrong. The other is to change the service signature to Save(IValidationService validation, ICustomerRepository repository, CustomerDTO customer) which is an invasive change. Break DI. Use the Strategy pattern approach for each type and do something like: validation= CustomerValidationServiceFactory.GetStratedgy(customer.Type); validation.Valid(customer) but now I have a static method which needs to know how to initialize different services. I am sure this is a very common problem, What is the right way to solve this without changing service signatures or breaking DI?

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• New XAML-Based User Group started in Birmingham, Alabama.

  - by mbcrump

  I’m pleased to announce that a new XAML-Based User Group has started in Birmingham, Alabama. The group is being hosted by Michael Crump and Jonathan Marbutt. The reason is very simple: we feel that Birmingham needs a fresh start. We are both very passionate about .NET and are hoping to share our experiences with the community. We have created a site (http://allaboutxaml.net) and our first meetup is now scheduled. We are here to discuss all things that have to do with xaml. This includes Silverlight, WPF, Windows Phone 7, Surface, Lightswitch and Silverlight with SharePoint 2010. We: believe strongly in xaml and are passionate about what we talk about. believe in an open-forum. believe a user group should be FUN as well as educational. do not claim to be an expert on anything, we are here to share. record every presentation and put it on the web for others to benefit. meet monthly but are flexible on the actual date. do our events outside of technical colleges. have families and our meetings start and stop on time. welcome new speakers. welcome adult beverages. Our first meeting is going to be on February 15th, 2011 (6PM), at Logan's on HWY 280. It is going to be more of a meetup than a meeting. I would like to discuss current xaml-based projects that you are working on and get to know one another. If you are interested in coming then please sign up here so that we know how many to expect. Please visit our site to find out more about us: http://allaboutxaml.net.

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• I created a program based on an LGPL project, and I'm not allowed to publish the source code

  - by Dave

  I thought LGPL was a permissive license, just like MIT, BSD or Apache. But today I read, that only linking to LGPL (libraries etc) is allowed from closed-source code - other than that, it's copyleft - so I have to publish code that is based on an LGPL program. I created a program for my employer that is based on an LGPL program, but has considerable modifications to it. Of course, I am not allowed to put that modified source code out there. At the same time, I have to, if I distribute it (right?). So I wonder whether there is a workaround to this, so I can keep this closed-source (I wish I could publish the source) - any suggestions? My idea: can I put most functions of the original LGPL app into an external library, write the core executable from scratch, but refer back to the library for all functions that I haven't modified? Currently, everything is in a .jar file (it's Java/Swing). if you think my idea is legally/technically feasible - how much effort would it be to seperate what I wrote and what the original is? I'm not the most java savvy.

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• Will high reputation in Stack Overflow help to get a good job?

  - by Shamim Hafiz

  In a post, Joel Spolsky mentioned that 5 digit StackOverflow reputation can help you to earn a job paying $100k+. How much of that is real? Would anyone like to share their success in getting high paid job by virtue of their reputations on StackExchange sites? I read somewhere that, a person got Interview offer in Google because a recruiter found his Stackoverflow reputation to be impressive. Anyone else with similar stories?

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• What options should I consider for a modern Web/Mobile development stack? [on hold]

  - by jimmy_terra

  I'm a long time server side dev who has been tasked with building a bleeding edge web UI (go figure), so apologies for the very broad nature of the question. What are the best modern libraries, tools, languages and patterns for building a dynamic web application that will run seamlessly on mobiles also? My requirements are that it must be dynamic (push updates), support automated testing, and should allow 'componentization' (a team of devs will be working on this). What should I check out and why? I will start off with some of the things I'm looking at already: Front-end HTML5 CSS3 JavaScript AngularJs Testing Karma Testem Jasmine Patterns Single Page Applications

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• Vector-based fonts vs. bitmap fonts in (2d) games?

  - by jmp97

  I know that many games are using bitmap fonts. Which are the advantages for vector-based font rendering / manipulation when compared to bitmap fonts and in which scenarios would they matter the most? Prefer a focus on 2d games when answering this question. If relevant, please include examples for games using either approach. Some factors you might consider: amount of text used in the game scaling of text overlaying glyphs and anti-aliasing general rendering quality font colors and styling user interface requirements localisation / unicode text wrapping and formatting cross-platform deployment 2d vs 3d Background: I am developing a simple falling blocks game in 2d, targeted for pc. I would like to add text labels for level, score, and menu buttons. I am using SFML which uses FreeType internally, so vector-based features are easily available for my project. In my view, font sizes in simple games often don't vary, and bitmap fonts should be easier for cross-platform concerns (font-formats and font rendering quality). But I am unsure if I am missing some important points here, especially since I want to polish the looks of the final game.

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• What stack of technologies should I use for my online game?

  - by Vee Bee

  I built a TicTacToe game to learn the .Net MVC3 framework. The basic functionality works (display board, make a move, detect winning move etc.) What I'd like to do is make it a "real" application - well-architected and using the right technology at the right layer. For instance, I'm currently saving every move to the database via a service call, which feels klugey and may become a bottleneck if this was an MMO game. How do you determine a good architecture (or right set of technologies) to use in a situation like this? I'd like to learn not just what to do, but why certain decisions are better than others. I noticed a similar thread here but it just offered opinions without explaining WHY something would be better (e.g. why Node instead of MVC3, etc.)

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• What HTML and CSS markup is best for SEO for a list of questions (like on Stack Exchange sites)

  - by Oleg9

  On the StackOverflow a question block (in the q-list on the index page and so on) represented by the following html code: <div class="question-summary narrow tagged-interesting" id="question-summary-19832613"> <div onclick="window.location.href='/questions/19832613/how-to-display-only-transit-routesfor-trains-in-google-maps-api'" class="cp"> <div class="votes"> <div class="mini-counts">0</div> <div>votes</div> </div> <div class="status unanswered"> <div class="mini-counts">0</div> <div>answers</div> </div> <div class="views"> <div class="mini-counts">3</div> <div>views</div> </div> </div> <div class="summary"> <h3>...</h3> <div class="tags t-javascript t-google-maps t-google t-google-maps-api-3"> </div> <div class="started"> <a href="/questions/19832613/how-to-display-only-transit-routesfor-trains-in-google-maps-api" class="started-link"><span title="2013-11-07 09:52:29Z" class="relativetime">1 min ago</span></a> <a href="/users/1309392/shirish">Shirish</a> <span class="reputation-score" title="reputation score " dir="ltr">189</span> </div> </div> </div> It uses float positioning. My questions is: Would use of css styled tables be a better choice? (It's a table, isn't it?) Or it just depends on what are you prefer to use and doesn't affect the technical side (search engines or something)? The background information (such as number of views, votes etc.) comes first in the code. And I know that search engines have a limit at viewing each page. So would it better to place div's depending on their importance and then markup them on the page using css methods (like negative margins and absolute positioning)? Or it isn't so important in this instance?

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• What sort of data should be sent for mouse-based movement in a multiplayer game?

  - by Daniel

  I'm new to the Multiplayer Rodeo here so please bear with me... I am just getting started and I'm trying to figure out how to deal with movement. I've looked at the question Best way to implement mouse-based movement in MMOG which gives me a pretty good idea, but I'm still struggling with what kind of data should be sent to the server. If a player is on position [x:0, y:0] and I click with the mouse on [x:40, y:40] to start movement, what information should I send to the server? Should I calculate the position based on velocity on client side and just send the expected location? Or should I send current location and velocity and direction? When the server is updating the clients on the players' whereabouts, should the position be sent only, and the clients expected to interpolate/predict movement, or can the direction sent from the client (instead of just coordinates) be used. My concern(or confusion) is regarding the ping/lag frequency of data update and use of a predictive algorithm, as I'd like the movement to be smooth even with a high latency, and prevent ability to cheat(though that's not the top priority).

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• How to enable a Web portal-based rich enterprise platform on different domains and hosts using JS without customization/ server configuration

  - by S.Jalali

  Our company Coscend has built a Web portal-based communications and cloud collaboration platform by using JavaScript (JS), which is embedded in HTML5 and formatted with CSS3. Other technologies used in the core code include Flash, Flex, PostgreSQL and MySQL. Our team would like to host this platform on five different Windows and Linux environments that run different types of Web servers such as IIS and Apache. Technical challenge: Each of these Windows and Linux servers have a different host name and domain name (and IP address), but we would like to keep our enterprise platform independent of host server configuration. Possible approach to solution: We think an API (interface module with a GUI) is needed to accomplish this level of modularity and flexibility while deploying at our enterprise customers. Seeking your insights: In this context, our team would appreciate your guidance on: Is there an algorithmic method to implement this Web portal-based platform in these Windows and Linux environments while separating it from server configuration, i.e., customizing the host name, domain name and IP address for each individual instance? For example, would it be suitable to create some JS variables / objects for host name and domain name and call them in the different implementations? If a reference to the host/domain names occurs on hundreds of portal modules, these variables or JS objects would replace that. If so, what is the best way to make these object modules written in JS portable and re-usable across different environments and instances for enterprise customers? Here is an example of the implemented code for the said platform. The following Web site (www.CoscendCommunications.com) was built using this enterprise collaboration platform and has the base code examples of the platform. This Web site is domain-specific. We like to make the underlying platform such that it is domain and host-independent. This will allow the underlying platform to be deployed in multiple instances of our enterprise customers.

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• What are the advantages to use vector-based fonts over bitmap fonts in (2d) games?

  - by jmp97

  I know that many games are using bitmap fonts. Which are the advantages for vector-based font rendering / manipulation when compared to bitmap fonts and in which scenarios would they matter the most? Prefer a focus on 2d games when answering this question. If relevant, please include examples for games using either approach. Some factors you might consider: amount of text used in the game scaling of text overlaying glyphs and anti-aliasing general rendering quality font colors and styling user interface requirements localisation / unicode text wrapping and formatting cross-platform deployment 2d vs 3d Background: I am developing a simple falling blocks game in 2d, targeted for pc. I would like to add text labels for level, score, and menu buttons. I am using SFML which uses FreeType internally, so vector-based features are easily available for my project. In my view, font sizes in simple games often don't vary, and bitmap fonts should be easier for cross-platform concerns (font-formats and font rendering quality). But I am unsure if I am missing some important points here, especially since I want to polish the looks of the final game.

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• Any good stories or blog posts of a startup's server/stack evolving as they got bigger? [closed]

  - by user72245

  I know lots of startups often go for practical, simple, efficient. So maybe tossing a Ruby program on a basic Apache server. Get some users up and running, etc. Then Ruby starts to not be fast enough, so they throw more servers at the problem? And load balancing or something? And then when stuff gets REALLY crazy, language changes, etc? I'm looking for someone who has cleanly and simply told their own company's story like this. Are there any good ones?

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• Merging similar graphs based solely on the graph structure?

  - by Buttons840

  I am looking for (or attempting to design) a technique for matching nodes from very similar graphs based on the structure of the graph*. In the examples below, the top graph has 5 nodes, and the bottom graph has 6 nodes. I would like to match the nodes from the top graph to the nodes in the bottom graph, such that the "0" nodes match, and the "1" nodes match, etc. This seems logically possible, because I can do it in my head for these simple examples. Now I just need to express my intuition in code. Are there any established algorithms or patterns I might consider? (* When I say based on the structure of the graph, I mean the solution shouldn't depend on the node labels; the numeric labels on the nodes are only for demonstration.) I'm also interested in the performance of any potential solutions. How well will they scale? Could I merge graphs with millions of nodes? In more complex cases, I recognize that the best solution may be subject to interpretation. Still, I'm hoping for a "good" way to merge complex graphs. (These are directed graphs; the thicker portion of an edge represents the head.)

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• How do 2D physics engines solve the problem of resolving collisions along tiled walls/floors in non-grid-based worlds?

  - by ssb

  I've been working on implementing my SAT algorithm which has been coming along well, but I've found that I'm at a wall when it comes to its actual use. There are plenty of questions regarding this issue on this site, but most of them either have no clear, good answer or have a solution based on checking grid positions. To restate the problem that I and many others are having, if you have a tiled surface, like a wall or a floor, consisting of several smaller component rectangles, and you traverse along them with another rectangle with force being applied into that structure, there are cases where the object gets caught on a false collision on an edge that faces the inside of the shape. I have spent a lot of time thinking about how I could possibly solve this without having to resort to a grid-based system, and I realized that physics engines do this properly. What I want to know is how they do this. What do physics engines do beyond basic SAT that allows this kind of proper collision resolution in complex environments? I've been looking through the source code to Box2D trying to find out how they do it but it's not quite as easy as looking at a Collision() method. I think I'm not good enough at physics to know what they're doing mathematically and not good enough at programming to know what they're doing programmatically. This is what I aim to fix.

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• Is it better to use a Database or a data structure for network stack?

  - by poly

  I've built a multi threaded messaging application in C and I'm currently using a MySQL Memory table to save the session ID, but I'm not sure whether this was a good decision or not. It works like this, the application sends a message and saves the source session ID in the MySQL table. When the application gets the success response it will remove the session's ID from the MySQL table, or if it received an error response then it will keep the ID to be retried later. I've built it this way so that I don't need to care about building a data structure by myself, and the Database provides flexibility when it comes to querying it. Do you think this is appropriate or do I need to use something else? Please note that the application is expecting to handle a large number of transactions/sec.

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• Why use binary files to stack up different versions on DMSs?

  - by edgarator

  I've used both Liferay and Alfresco trying to use them as the Document Management System for an intranet. I noticed the following: They use the file system and the database to store files They use a GUID to name the file on the filesystem and that GUID is used as an Id in the database. The GUID-named file is a binary file The GUID-named binary file stores all versions for a given file The path for the file in the DMS doesn't match the one in the file system The URL makes reference to the GUID when a certain file is requested What I want to know is why is this, and what would be the best way of doing it. Like how to would you create the binary file (zip?), and what parts would you keep in the binary file and what parts would you store in the database (meta-data, path?). I'm assuming some of the benefits of doing it like this. As having the same URL for a file, regardless of its current document path. And having only one file even if the file has changed names over time.

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