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• Which social sign-in (Google, twitter, fb, etc) is most often used (if I could only choose one, which would statistically retain the most users)?

  - by David

  I am working with a startup which is about to do it's launch in maybe 2-3 weeks. In order to see the primary features of the site, the user has to register or sign in if they have already registered. We quickly decided we wanted to incorporate social plugins as alternatives to a conventional sign up, just like stackexchange does. But seeing that we are strapped for time and fairly amateur developers, I'm trying to justify just choosing one or two social sign-ins to start with for the launch and then maybe add more later. Based on my experience as a user, I'm guessing that twitter and google (in no particular order of importance) would probably be the most important social sign-ins in order to retain as many users as possible, but have absolutely no statistics to back that up other than my own anecdotal experience. This question hasn't been visibly asked on the internet, so I figured I'd hop on stackexchange and give it a punt. Thanks.

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• Does HTML5 have a feature that enables a user to add an icon to the Apps screen when "installing", and if not, when are they planning to add it?

  - by Jason Livesay

  I know that the mobile bookmark bubble might sort of work for iOS, but it isn't going in the same section. And for Android, bookmarking is really not going to cut it for a mobile HTML5 application install since users just don't think to go to their bookmarks and that bookmark process takes two or three steps. To me this issue of getting the application (bookmark) installed pretty much makes the rest of the HTML 5 features aimed at mobile HTML much less useful. I can't realistically expect users to prefer the bookmark install and launch process over regular apps, so I can realistically expect them to ignore my mobile HTML5 application and use a native app. The groups behind mobile HTML 5 features do seem to be pushing for HTML 5 apps adoption with things like Application Cache etc. To me it seems obvious that the bookmark bubble is not going to cut it. Someone please tell me they have addressed this or at least are working on it?

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• Efficient way to calculate "vision cones" on 2D tile map?

  - by OverMachoGrande

  I'm trying to calculate which tiles a particular unit can "see" if facing a certain direction on a tile map (within a certain range and angle of facing). The easiest way would be to draw a certain number of tiles outward and raycast to each tile. However, I'm hoping for something slightly more efficient. A picture says a thousand words: The red dot is the unit (who's facing upwards). My goal is to calculate the yellow tiles. The green blocks are walls (walls are between tiles, and it's easy to check if you can pass between two tiles). The blue line represents something like the "raycasting" method I was talking about, but I'd rather not have to do this. EDIT: Units can only be facing north/south/east/west (0, 90, 180, or 270 degrees) and FoV is always 90 degrees. Should simplify some calculations. I'm thinking there's some sort of recursive-ish/stack-based/queue-based algorithm, but I can't quite figure it out. Thanks!

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• Where does the light come from, using Maya/Panda3D?

  - by Aerovistae

  Total noob to Maya. Total noob to Panda3D. Planning on becoming really good at both as soon as I have free time to do so, but right now I have an assignment due in a few hours which requires this: (The part which confuses me is bolded.) Model and texture a vehicle and two different obstacles Build a scene graph in Panda with a plane, the vehicle, several copies of each of the obstacles, and (at least) a direction light Program vehicle movement, constrained to a plane (no terrain) Working headlights Vehicle collides with obstacles How do I attach a light source to a model? I'm assuming this is done in Panda3D but I'm sufficiently new to this that I wouldn't be astonished to hear it's part of the model.

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• How far back do you use your version control and for what reason?

  - by acidzombie24

  Typically when i work on a project i only go back a few days or the last major change when i decide to do something drastic. I sometimes notice i broke a test or a feature and overlooked it for a few weeks so i may go back a month or two and see if the feature or test is broken and trace down the week i broke it. Then find what change did it. On a long term project over the span of a year. Do you actually go back 6+ months and if so why?

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• Port forward based on external IP (for VPS hosting)

  - by Ben Alter

  What I want to do is to host a VPS. First, I'd like to set up a static IP address that forwards to my home IP address (so I can have more than one IP coming into my house). How can I do this without contacting my ISP (and is it even possible?; I don't care about paying for something that does this). Once I have the extra external IP address, how can I forward it to my VPS? How is my router supposed to differentiate between two separate external IP addresses?

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• Any tips to learn how to program with severe ADHD?

  - by twinbornJoint

  I have a difficult time trying to learn how to program from straight text-books. Video training seems to work well for me in my past experiences with PHP. I am trying my hardest to stay focussed and push through. Specifically I am looking to start indie game development. Over the last two weeks I have been trying to pick the "right" language and framework to develop with. I started going through Python, but I am not really enjoying the language so far. I am constantly looking through this website to compare this language to that, and keep getting distracted. Aside from all of this, is it possible to become a programmer when you have trouble focussing? Has anyone been through this that can recommend some advice? edit - you guys can check my new question out with detailed information thanks to all of the responses from this thread. http://programmers.stackexchange.com/questions/15916/what-is-the-best-language-and-framework-for-my-situation

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• Inexpensive generation of hierarchical unique IDs

  - by romaninsh

  My application is building a hierarchical structure like this: root = { 'id': 'root', 'children': [ { 'name': 'root_foo', 'children': [] }, { 'id': 'root_foo2', 'children': [ { 'id': 'root_foo2_bar', 'children': [] } ] } ] } in other words, it's a tree of nodes, where each node might have child elements and unique identifier I call "id". When a new child is added, I need to generate a unique identifier for it, however I have two problems: identifiers are getting too long adding many children takes slower, as I need to find first available id My requirement is: naming of a child X must be determined only from the state in their ancestors When I re-generate tree with same contents, the IDs must be same or in other words, when we have nodes A and B, creating child in A, must not affect the name given to children of B. I know that one way to optimize would be to introduce counter in each node and append it to the names which will solve my performance issue, but will not address the issue with the "long identifiers". Could you suggest me the algorithm for quickly coming up with new IDs?

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• Are there compatibility issues opening Visual Studio Professional projects in Visual Studio Express, and vice versa? [migrated]

  - by theGreenCabbage

  Disclaimer: I have taken a look at the 50+ StackExchange forums to find the right place, and it seems /Programmers/ is the most suitable Exchange for this. If this is the wrong place to ask this, however, please let me know - I will personally delete the thread. I am in the process of downloading a single license for Visual Studio 2013 for my firm of 2-3 developers. One license is approximately $498.00 USD. As a small firm, our funds are short, but since we will be creating commercial software, we decided we will be needing the features of the Professional edition. At the same time, our decision is to use the Express edition for the rest of the two developers. My question is - will there be compatibility issues between Express projects and Professional projects for Visual Studio?

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• What are the pros and cons of a non-fixed-interval update loop?

  - by akonsu

  I am studying various approaches to implementing a game loop and I have found this article. In the article the author implements a loop which, if the processing falls behind in time, skips frame renderings and just updates the game in a loop (the last variant called "Constant Game Speed independent of Variable FPS"). I do not understand why it is acceptable to call update_game() in a loop without making sure the update function is called at a particular interval. I do not see any value in doing this. I would think that in my game I want to be sure the game is updated periodically with a known period. So maybe it is worthwhile to have two threads, one would call update periodically, and the other one would redraw the game, also periodically? Would this be a good and practical approach? Of course I would need to synchronise the threads.

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• What do you think about gems and eggs? Alternatives?

  - by Juanlu001

  I've read recently some criticism (see 1, 2, 3) about the packaging distribution system of two popular programming languages: Ruby gems and Python eggs. The most important argument stated against them is that they replace the system package manager (in case there is one, as in every Linux distribution), which makes eggs and gems difficult to track, code difficult to patch, and so on. Are actually eggs and gems right? In case not, are there any alternatives to distributing Python or Ruby modules? Should developers focus on taking advantage of package manager (apt-get, pacman, ...) capabilities?

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• Page not found in browsers

  - by Chetan

  I'm using ubuntu 12.04.1, last upgraded from 12.04 I'm using mts mblaze to access internet. Two days ago, I was using vpn on my system, suddenly cisco disconnected & my system hung while I was accessing my office system. I didnt' have any other idea, so I forcibly shut down the system. After that, connection is made, but firefox or chromium both don't find any page. I think there's some problem with the system package. Please let me know a good solution. Regards, Chetan

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• Advice on how to understand in general and in practice IT Infrastructure

  - by Luca

  My IT knowledge resides mainly in SW development. I have just some basic know how about networks. On the net I tried to get information and read books in order to better understand the overall IT infrastrcuture, but all the sources I found are too generic or, mainly, too detailed in just one aspect, making me lost. Could anyone suggest some books or web resources as good compromise in details? My goal would be able to understand the network issues and security threats when, for example, two remote system have to be setup and put in connection each other. Considering this scenario there are several aspects to consider: firewalls, intranet/internet interconnections, certificates for httpS, etc. The argument is quite wide, therefore I was looking for something that might help to start to understand this subject without going too deep in details (Computer Networks from A.Tanenbaum is a wonderful milestone, but way too specific for my scope). Thanks

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• Application starts as Terminal but not as a Desktop entry

  - by Dcm1405

  I just installed SQL Anywhere 12 and can start Sybase Central from the terminal with the command line below without errors: /opt/sqlanywhere12/bin32/scjview However, when I try to start it from a desktop entry I am receiving two error messages that could be something incorrectly defined in the desktop below: #!/usr/bin/env xdg-open [Desktop Entry] Version=1.0 Type=Application Terminal=false Icon[en_US]=gnome-panel-launcher Name[en_US]=Sybase Central Exec=/opt/sqlanywhere12/bin32/scjview Comment[en_US]= Name=Sybase Central Comment= Icon=gnome-panel-launcher Here are the error messages: (unable to post the error images) cannot find libsyblib610_r.so cannot find libulscutil12.so Since the application can be successfully started from a terminal window I was wondering how I could have it setup as a desktop entry as well.

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• Corona sdk events dispatched with dispatchEvent() are handled directly upon call. Why so?

  - by Amoxus

  I noticed to my surprise that an event created with dispatchEvent(event) gets handled directly when called, and not together with other events at a specific phase of the frame loop. Two main reasons of having an event system are: so that you can call code B from code A, but still want to prioritize code A. to make sure there are no freaky loopedy loops where code A calls code B calls code A ... I wonder what Ansca's rationale behind having events being handled directly this way is. And does Corona handle loopedy loops and other such pitfalls gracefully? The following code demonstrates dispatchEvent(): T= {} Z = display.newRect(100,100,100,100) function T.doSomething() print("T.doSomething: begun") local event = { name="myEventType", target=T } Z:dispatchEvent( event ) print("T.doSomething: ended") end function Z.sayHello(event) print("Z.sayHello: begun and ended") end Z:addEventListener("myEventType", Z.sayHello) print("Main: begun") T.doSomething() print("Main: ended") However Ansca claims the contrary at http://developer.coronalabs.com/reference/index/objectdispatchevent Can anyone clear this up a little? ( Using Corona simulator V 2012.840 )

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• SQLAuthority News Microsoft SQL Server 2005/2008 Query Optimization & Performance Tuning Training

  Last 3 days to register for the courses. This is one time offer with big discount. The deadline for the course registration is 5th May, 2010. There are two different courses are offered by Solid Quality Mentors 1) Microsoft SQL Server 2005/2008 Query Optimization & Performance Tuning – Pinal Dave Date: May 12-14, 2010 Price: [...]...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• What is good side of PageRank?

  - by SharkTheDark

  I am doing research about backlinks/PR/SEO/Search Result position and all I read about is that PageRank is not important, that it worth before but now it's not important at all. Only thing I found useful about it that is "change Search Result position", but ONLY if there are two sites with same keywords and same text content value, then Search Engine will check which site has higher PR and place that site above lowest one. Google counts PR importance as 20% for displaying search rankings, and Yahoo! is like 3%... Correct me if I am wrong... Is there any other good thing from it?

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• Resources for a fighting game

  - by David

  As the title says, I need resources for a 2D fighting game for the PC. The game is being made by me and two close friends. I'm thinking of using the FlatRedBall engine and either Allegro Sprite Editor or Amiga DPaint for the sprites, but I don't know is there is anything better for a more or less beginner in video game making. So my questions are as follows, what would be the best engine to use so that we could also sell the game later on, (I don't really care what language I'd have to use) and what would be the best thing to use for sprite creating? I would really appreciate any help given.

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• How to handle loading and keeping many bitmaps in an Android 2D game

  - by Lumis

  In an Android 2D game which is using SurfaceView where its onDraw is driven by a loop from a Thread, I use many bitmap sprites (sprite sheets) and two background size bitmaps, which are all loaded into memory at the start. It all works fine, however, when the activity is onPause or after reloading it few times, Android shows a tendency to wipe out the big bitmaps only, probably to free memory. Sometimes this happens even in the middle of loading this very activity. In order to counter this, I made a check in the onDraw method to test if the big bitmaps are still there and reload them if they are forcefully recycled by Android, before drawing them on Canvas. This solution may not be the most stable, and since I know that there are much more accomplished android game programmers here than myself, I hope you can reveal some tricks or secrets or at least provide some good hints, how to overcome this.

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• How to solve problems with movement in simple tile based multiplayer game?

  - by Murlo

  I'm making a simple tile based 2D multiplayer game in JavaScript using socket.io where you can move one tile every 200 ms. The two solutions I've tried are as follows: The client sends "walk one tile north" every 200 ms. Problem: People can easily hack the client to send the action more often. The client sends "walking north" and "stopped walking". Problem: Sometimes the player moves extra steps when "stopped walking" doesn't arrive in time. Do you know a way around these problems or is there a better way to do it? EDIT: Regarding the first solution I've tried adding validation on the server to check if it has been 200 ms since last movement. The problem is that latency still encourages people just to spam the action as much as possible, giving them an unfair advantage.

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• Should SpecFlow be used with BDD as a solo developer?

  - by baens

  I am a long time fan of TDD and after reading the RSpec book, would like to transistion to a BDD process. I like the idea of driving from the outside in, as it is presented in the book. What I am having a hard time getting a handle on is how to structure the tests. I have tried SpecFlow, but it seems cumbersome to use when I am the only one really ever going to be looking at the tests. I like the idea of just using straight NUnit, rather then adding another framework, like it is presented here. Is this a good way to try and structure BDD tests? Is there more information out there on comparing the two ways (that may even be more recent)?

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• Game Editor - When screen is clicked, how do you identify which object that is clicked?

  - by Deukalion

  I'm trying to create a Game Editor, currently just placing different types of Shapes and such. I'm doing this in Windows Forms while drawing the 3D with XNA. So, if I have a couple of Shapes on the screen and I click the screen I want to be able to identify "which" of these objects you clicked. What is the best method for this? Since having two objects one behind the other, it should be able to recognize the one in front and not the one behind it and also if I rotate the camera and click on the one behind it - it should identify it and not the first one. Are there any smart ways to go about this?

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• How to prevent certain applications from accessing the internet?

  - by Arun Haridas

  I want to prevent certain applications from accessing the internet. When I was using windows XP I had an application (i think it was Zone alarm) which always notified me when an application tried to access the internet. I wonder if there is an application in Ubuntu which would do the same task. If it is possible, please suggest a gui application. the problem is, my internet provider allows me to connect to a single host at a time, that means no two applications can use internet at the same time. When i checked system monitor it showing me that internet is working fine still my browser cant browse.So i want to kill the other application using the internet to browse.

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• Grub errors during UEFI dual boot for Windows 8 (can't find command 'drivemap')

  - by luca-mastro

  I have got a newly bought ASUS N56V with Windows 8 preinstalled. I needed to install Ubuntu so i partitioned the disk and after having disabled the Secure Boot option from Windows 8 i successfully installed Ubuntu 12.10 from a Live USB. The problem is that if i try to access both to Windows 8 (loader) and Windows Recovery System (loader) from the GRUB menu, these two errors show: can't find command 'drivemap' and invalid EFI file path and it goes back to the grub menu. In conclusion I do not have access to my Windows 8 partition but can only use Ubuntu. How can I solve the problem? I am pretty new to the matter. Thank you!

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• How to get rid of the orange highlight in Unity?

  - by user74660

  I've installed Ubuntu 12.04 LTS and I'm using Unity. I also installed Adwaita theme and Elementary icons. Everything is cool. Highlightings are blue, as I want them to be, but there are some places where the default orange color remains: When clicking on Workspace Switcher, the borders of the current or the selected workspace are still orange. When dragging a window to the edges of the screen, the highlight effect for the Snap Window feature is still orange as well. All other highlights are blue, according to the Adwaita theme. So, how can I get rid of those two mentioned orange highlights and turn them into blue, following the Adwaita color theme? Thanks for your attention. brunces

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