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• Alan Turing Needs Your Help

  - by Chris Massey

  Well. sort of. Clearly, you are using a computer. If you are on this site, you are probably quite familiar with computers as artifacts of our modern society. Hopefully, you are also familiar with the fact that Alan Turing, logician and mathematician extraordinaire, was instrumental in laying down the foundations of modern computer science, and did a little work to help turn the tide of WWII in the Allies' favor. Hold that thought. A phenomenal collection of Turing's papers (including his first ever...(read more)

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• How can I locate empty space next to polygon regions?

  - by Stephen

  Let's say I have the following area in a top-down map: The circle is the player, the black square is an obstacle, and the grey polygons with red borders are walk-able areas that will be used as a navigation mesh for enemies. Obstacles and grey polygons are always convex. The grey regions were defined using an algorithm when the world was generated at runtime. Notice the little white column. I need to figure out where any empty space like this is, if at all, after the algorithm builds the grey regions, so that I can fill the space with another region. Basically what I'm hoping for is an algorithm that can detect empty space next to a polygon.

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• Writing low latency Java

  - by user997112

  Are there any Java-specific techniques (things which wouldnt apply to C++) for writing low latency code, in Java? I often see Java low latency roles and they ask for experience writing low latency Java- which sometimes seems a little bit of an oxymoron. The only think I could think of is experience with JNI, outsourcing I/O calls to native code. Also possibly using the disruptor pattern, but thats not an actual technology. Are there any Java specific tips for writing low latency code? I am aware there is a Real Time Java Spec, but I have been warned real-time is not the same as low latency....

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• Removed Xserver driver. ubuntu doesnt start. what should i Do?

  - by user71576

  im new on ubuntu , i intalled it ( dual booted with windows 7) i was customizing it, but when i tried to run compiz it said that missing glx or something like that in the screen, i realized that the driver that i was not using wasnt the gefroce on so i went to nvidia downloaded the correct version for my graphic ( geforce gtm 525m) when y run the .run file it told me that i was using xserver and that i cant install this driver with the xserver installed. i search for information of how to remove or disable xserver i found one. in this web site --http://www.ubuntugeek.com/ubuntu-tiphow-to-removeinstall-and-reconfigure-xorg-without-reinstalling-ubuntu.html when i run the command , after that i tried to instal the geforce on, doesnt work so i remember windows that you must reboot after a driver unintallation or intallation so i reboot, them ubuntu doesnto load, it show the ubuntu whit the five dots like or 1-2 sec and them i get a black screen ( not the red-black of ubutntu ) so why i should do. i dont want to re install i dont have a cd and my usb is a little damaged so please if you could help me

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• How to create a 3D world with 2D sprites similar to Ragnorak online?

  - by Romoku

  As far as I know Ragnorak Online is a 3D game world with 2D sprites overlayed. I would like to use this style in a game I am making in Unity, so I would like the player to be able to select little square tiles on the terrain. There are a couple routes I could take such as using a bunch of cubic polygons and linking them together or using one big map. The former approach doesn't seem to make any sense if the world is not flat as polygons wouldn't be reused often. The goal is to break down a 3D polygon into tiles which is heard to wrap my head around. I believe using something like an interval tree or array would be appropriate to store the rectangle grid, but how would I display a rectangle around the selection the player has his mouse over on the polygon terrain itself? Here is a screenshot. Here is a gameplay video. Here is the camera usage.

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• What programming languages have you taught your children?

  - by Dubmun

  I'm a C# developer by trade but have had exposure to many languages (including Java, C++, and multiple scripting languages) over the course of my education and career. Since I code in the MS world for work I am most familiar with their stack and so I was excited when Small Basic was announced. I immediately started teaching my oldest to program in it but felt that something was missing from the experience. Being able to look up every command with the IDE's intellisense seemed to take something from the experience. Sure, it was easy to grasp but I found myself thinking that a little more challenge might be in order. I'm looking for something better and I would like to hear your experiences with teaching your children to program in whatever language you have chosen to do so in. What did you like and dislike? How fast did they pick it up? Were they challenged? Frustrated? Thank you very much!

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• Gerrit, git and reviewing whole branch

  - by liori

  I'm now learning Gerrit (which is the first code review tool I use). Gerrit requires a reviewed change to consist of a single commit. My feature branch has about 10 commits. The gerrit-prefered way is to squash those 10 commits into a single one. However this way if the commit will be merged into the target branch, the internal history of that feature branch will be lost. For example, I won't be able to use git-bisect to bisect into those commits. Am I right? I am a little bit worried about this state of things. What is the rationale for this choice? Is there any way of doing this in Gerrit without losing history?

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• Rain effect looks like snowfall effect?

  - by Nikhil Lamba

  i am making a game in that game i want rain effect i am little bit far from this right now i am doing like below particleSystem.addParticleInitializer(new ColorInitializer(1, 1, 1)); particleSystem.addParticleInitializer(new AlphaInitializer(0)); particleSystem.setBlendFunction(GL10.GL_SRC_ALPHA, GL10.GL_ONE); particleSystem.addParticleInitializer(new VelocityInitializer(2, 2, 20, 10)); particleSystem.addParticleInitializer(new RotationInitializer(0.0f, 30.0f)); particleSystem.addParticleModifier(new ScaleModifier(1.0f, 2.0f, 0, 150)); particleSystem.addParticleModifier(new ColorModifier(1, 1, 1, 1f, 1, 1, 1, 3)); particleSystem.addParticleModifier(new ColorModifier(1, 1, 1f, 1, 1, 1, 1, 6)); particleSystem.addParticleModifier(new AlphaModifier(0, 1, 0, 3)); particleSystem.addParticleModifier(new AlphaModifier(1, 0, 1, 125)); particleSystem.addParticleModifier(new ExpireModifier(50, 50)); scene.attachChild(particleSystem); But its looks like snowfall effect what changes i can do for make it rain effect please correct me EDIT : here is link for snapshot http://i.imgur.com/bRIMP.png

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• Multiple Sprites using foreach Collison Detection in XNA (C#)

  - by Bradley Kreuger

  Back again from my last question. Now I was curious I use a foreach statement to use the same shot class. How would I go about doing collison detection. I used the tutorial here on how to shoot a fireball http://www.xnadevelopment.com/tutorials.shtml. I tried to put in several places a foreach to look at all of them to see if they have reached the borders of my sprite hero but doesn't seem to do anything. If again some one might know of a good site that has tutorials to explain collision detection a little bit better that would be appriecated.

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• The Complete Window Cameo Collection from the Original Batman Series [Video]

  - by Asian Angel

  Are you a fan of the classic Batman T.V. series? Think you know who all the guest stars were that did window cameos in the series? Then put your knowledge to the test with this fun compilation video by YouTube user loomyaire. You can check your answers (or find out the names of the ones you may have missed) at the links below! The Complete 14 Batman Window Cameos [via BoingBoing] What’s the Difference Between Sleep and Hibernate in Windows? Screenshot Tour: XBMC 11 Eden Rocks Improved iOS Support, AirPlay, and Even a Custom XBMC OS How To Be Your Own Personal Clone Army (With a Little Photoshop)

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• 410 Responses when your CMS host doesn't support them?

  - by leeand00

  Sending a 410 responses for a page that no longer exist should make Google stop crawling for that page. The site I am working on has been recently migrated, and very little of the content was migrated. I've already turned the existing content into 301 redirects (the content that is on both the old and the new site), but now I would like to flush the old content from Google's memory by placing 410 responses in it's path when it returns to crawl for them and finds a 404 response. However, I asked our CMS host about it, and they said that our CMS does not support 410 responses. Is there some other way to post a 410 response, like making a dead link 301 redirect to a page that a 410 response in the form of a meta tag?

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• How do I get Flash 10.2 RC + Crystal HD for HW accelerated video to work?

  - by Gee

  I have a netbook with a N450 Atom and a BCM70012 aka Crystal HD card. On Windows 7 I can play HD flash video with very little CPU usage because of the RC of Flash 10.2. I did some reading and saw posts claiming that the Crystal HD card is finally supported by the newer Flash 10.2 RC in Ubuntu but I can't get it to work. I can confirm that flash 10.2 is loaded and used, and there's even a HW acceleration option that is enabled in the settings but performance is horrible. From what I read, the Crystal HD card is supposed to be enabled on 10.10 by default - I don't know if it is. I tried installing drivers for it in various ways but HD flash video is still a slideshow So does anyone have it working? If so, how'd you set it up?

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• Correct definition of the term "Yak Shaving"

  - by StevenWilkins

  The wiktionary has two different definitions: Any apparently useless activity which, by allowing you to overcome intermediate difficulties, allows you to solve a larger problem. The actually useless activity you do that appears important when you are consciously or unconsciously procrastinating about a larger problem. This post defines it as: yak shaving is what you are doing when you're doing some stupid, fiddly little task that bears no obvious relationship to what you're supposed to be working on, but yet a chain of twelve causal relations links what you're doing to the original meta-task. I personally prefer the final definition because it contains the word "fiddly" which I think perfectly describes a typical yak shaving task. What is the best definition you've come across or can provide?

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• ArchBeat Link-o-Rama for 2012-04-04

  - by Bob Rhubart

  Is This How the Execs React to Your Recommendations? blogs.oracle.com "Well then, do your homework next time!" advises Rick Ramsey, and offers a list of Oracle Solaris 11 resources that just might make your next encounter a little less humiliating. WebLogic Server Performance and Tuning: Part I - Tuning JVM | Gokhan Gungor blogs.oracle.com A detailed how-to post from Gokhan Gungor. How to deal with transport level security policy with OSB | Jian Liang blogs.oracle.com Jian Liang shares "a use case for Oracle Service Bus (OSB) 11gPS4 to consume a Web Service which is secured by HTTP transport level security policy." Thought for the Day "Simple things should be simple and complex things should be possible." — Alan Kay

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• What is the point of the prototype method?

  - by Mild Fuzz

  I am reading through Javascript: The Good Parts, and struggled to get my head around the section on prototypes. After a little google, I came to the conclusion that it is to add properties to objects after the objects declaration. Using this script gleamed from w3schools, I noticed that removing the line adding the prototype property had no effect. So what is the point? //Prototyping function employee(name,jobtitle,born) { this.name=name; this.jobtitle=jobtitle; this.born=born; } var fred=new employee("Fred Flintstone","Caveman",1970); employee.prototype.salary=null; // <--- try removing this line fred.salary=20000; document.write(fred.salary);

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• How do I document my code?

  - by Brian Ortiz

  I'm a hobbyist programmer (with no formal education) looking to start doing small freelance jobs. One of the things that hobbyist programmers can get away with that those with a "real" job can't is lack of documentation. After all, you wrote it so you know how it works. I feel a little silly asking because it seems like such a basic thing, but how do I document my code? How should it be formatted? How should it be presented? (HTML pages? LaTeX?) What does/doesn't need to be documented? ...And maybe more specifics I haven't thought of. I mostly program in PHP but also C#.

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• How to clear the resent server name list in SQL Server Management Studio

  - by Pavan Kumar Pabothu

  If you are using SQL Server management Studio much the we can observer that the list of server names in the log in of it. As you can imagin a period of time after 6 month or 1 year you will see a long list of server names in the login dialog. How to clear this list...? I doesn't provide a mechanism to clean nor clear the list, so you'll have to do a little browsing through your file system. For SQl Server 2005 Management Studio, we should delete the below file C:\Documents and Settings\<user>\Application Data\Microsoft\Microsoft SQL Server\90\Tools\Shell\mru.dat. For SQl Server 2008 Management Studio, we should delete the below file C:\Documents and Settings\<user>\Application Data\Microsoft\Microsoft SQL Server\90\Tools\Shell\SQLStudio.bin. After deletion we can re-login the Management studio and can see the empty list.

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• Upgrade to Xubuntu 11.04 Breaks Wireless

  - by fleamour

  When I tried to connect at my mother's house and then my brother's house; the little connection icon would circle forever before eventually prompting for password. I have triple checked all network keys & then some. Even with my home network I now have to revert to 10.04 LTS Lucid Lynx (dual boot) or wired Ethernet. Not even sure where to start trouble shooting TBH? My card is a Edimax EW-7108PCg PCMCIA card which I bought for it's out the box Linux compatibility. Hardware is an IBM Thinkpad T21.

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• How can I use the Windows key?

  - by torbengb

  The Windows key seems to not have any use in Ubuntu, but since I'm just coming from Windows I'm used to this key having some function. How can I make good use of the Windows key in Ubuntu? I've seen that I can remap keys in SystemPreferencesKeyboardLayoutOptionsAlt/Win key behavior, but I have no idea what the choices meta, super, hyper mean. The help button in this dialog doesn't give any specifics about them. I've experimented a little and found that meta seems to have some use, like Win+M = Me menu, or Win+S is the shutdown menu, but for some keys (B, I) it's more like Ctrl (bold, italic). Haven't found any further. What would a useful setting be for a Linux newbie?

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• The Effects of Caffeine [Video]

  - by Jason Fitzpatrick

  Whether in a cup, a can, or a little bottle, millions of us slug back caffeinated beverages everyday. Check out this video to see how it effects your brain and why it keeps you alert. Courtesy of Alex Dainis at Bite Sci-zed, we’re treated to a rather energetic look at the function of caffeine in the body. Caffeine!! – Bite Sci-zed [via Geeks Are Sexy] How To Delete, Move, or Rename Locked Files in Windows HTG Explains: Why Screen Savers Are No Longer Necessary 6 Ways Windows 8 Is More Secure Than Windows 7

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• Open Source Web-based CMS for writing and managing API documentation

  - by netcoder

  This is a question that have somewhat been asked before (i.e.: How to manage an open source project's documentation). However, my question is a little different because: We're not developing open source software, but proprietary software The documentation has to be hand-written, because we do not want to publish the actual software API documentation, but only the public API documentation I do want developers and project managers to write the documentation collaboratively Obviously, wikis are a solution, but they're very generic. I'm looking for a more specialized tool for this job. I've looked around and found a few like Adobe Robohelp, SaaS solutions and such, but I'd like to know if any open source software exists for that purpose. Do you know any Open Source Web-based CMS for writing and managing API and software documentation?

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• MacBook Pro 5.5 32-bit or 64-bit 12.04 LTS

  - by Barkerto

  I'm currently running Ubuntu 12.04 LTS 64-bit on a Macbook Pro 5.5. I'm dealing with a couple of issues with the backlight and other little pesky things which with my understanding could be caused by the silly Mac, or just a brand new LTS, or both. Is it known for macs running ubuntu to run better with the 64-bit or 32-bit? I know that the bit size deals with info transfer, but I'm just curious if the versions react differently with the macs cpu and hardware (for example if I switch to 32-bit would the backlight issue be resolved) and resulting in a better user experience. =) thanks in advance

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• Proper fstab entry to mount a samba share in 12.04

  - by JPbuntu

  I am a little confused on the proper fstab entry for a samba share in Ubuntu 12.04 I can get the drive to mount manually by using: sudo mount -t cifs //192.168.2.2/raid_drive /mnt/homeserver -o username=jon,password=password So I tried putting this in fstab: //192.168.2.2/raid_drive /mnt/homeserver cifs username=jon,password=password,iocharset=utf8,mode=0777,dir_mode=07??77 0 0 Which gives me this error in syslog: kernel: [ 2217.925354] CIFS: Unknown mount option mode kernel: [ 2217.936345] CIFS VFS: default security mechanism requested. The default security mechanism will be upgraded from ntlm to ntlmv2 in kernel release 3.3 This guide says to use smbfs although I believe smbfs is deprecated? What is a common fstab configuration for a samba share in Ubuntu 12.04? EDIT: Using the accepted answer below I was initially getting this error message (from dmesg): [ 45.520883] CIFS VFS: Error connecting to socket. Aborting operation [ 45.520990] CIFS VFS: cifs_mount failed w/return code = -115 although it turns out this was due to network connectivity issues, and not related to improper fstab entry.

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• Version Control & Build Systems free Headspring on 5/18

  Headspring is putting on another free workshop at the Austin Microsoft office.  This one will be led by Senior Consultant, Eric Anderson.  Here are the details: Headspring Presents: Version Control and Build Systems for Growing Teams a workshop by Eric Anderson on: Does your team run into frequent conflicts with source control? Has your build system become a broken window with little hope of repair? Do you struggle to deploy minor changes and bug fixes while keeping the system stable?...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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• Do image backlinks count as backlinks?

  - by sam

  If i have lots of images appearing tumblr blogs, the sort of tumblogs with very little text just reams and reams of images for people to browse through (example - http://whereisthecool.com/). If my image is embeded in their site like this : <a href="http://mysite.com" target="blank"> <img src="cutecatblog.com/cat.jpg" alt="cute cat"/> </a> so the image was a link back to my site. Although there is no anchor text to speak of does google take into account the alt text of the image ? Would this still count in googles eyes as a backlink ?

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