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• Hot: Pre-built Developer VMs from OTN

  - by Justin Kestelyn

  For those of you who haven't already played with it, Oracle VM VirtualBox is an awfully cool desktop virtualization tool. Even better, it's free. We OTN-ers like it even more than you will though because it allows us to freeze-dry entire software stacks into VM images. Developers can simply download a few files, assemble them with a script we provide, and then import and run the resulting pre-built VM in VirtualBox. Voila, instant (insert name here) stack. These VMs are particularly handy in support of in-person workshops, but there's no reason we can't make them available for everyone. Which we have done, in Java, database, and SOA/BPM flavors. (All "ingredients" are listed at the referenced link, and they are extensive.) Now that we have the kinks worked out, other flavors are sure to become available in 2011. Now go get 'em!

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• OpenGL 2D Depth Perception

  - by Stephen James

  I have a 2D RPG game written in Java using LWJGL. All works fine, but at the moment I'm having trouble deciding what the best way to do depth perception is. So , for example, if the player goes in front of the tree/enemy (lower than the objects y-coordinate) then show the player in front), if the player goes behind the tree/enemy (higher than the objects specific y-coordinate), then show the player behind the object. I have tried writing a block of code to deal with this, and it works quite well for the trees, but not for the enemies yet. Is there a simpler way of doing this in LWJGL that I'm missing?

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• Efficient way to sort large set of numbers

  - by 7Aces

  I have to sort a set of 100000 integers as a part of a programming Q. The time limit is pretty restrictive, so I have to use the most time-efficient approach possible. My current code - #include<cstdio> #include<algorithm> using namespace std; int main() { int n,d[100000],i; for(i=0;i<n;++i) { scanf("%d",&d[i]); } sort(d,d+n); .... } Would this approach be more efiicient? int main() { int n,d[100000],i; for(i=0;i<n;++i) { scanf("%d",&d[i]); sort(d,d+i+1); } .... } What is the most efficient way to sort a large dataset? Note - Not homework...

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• What you don't like in your web-framework of "choice"?

  - by 0101

  Most of the time we don't have a choice were it comes to web-frameworks, in Java every company is using a different one(big thanks to web-framework developers - you will burn in hell). However now I have a choice of picking which framework we will use, I will probably pick the one I know the best since I know how to by-pass its downfalls. In every comparation we will only see what is good in that frameworks and any downfalls will be swept under the carpet. What are the downfalls of most known frameworks?

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• Desktop Fun: TRON and TRON Legacy Customization Set

  - by Asian Angel

  Are you a Program or a User? Choose your destiny while bringing the battle for the Grid and freedom to your desktop with our TRON and TRON Legacy Customization Set Latest Features How-To Geek ETC Inspire Geek Love with These Hilarious Geek Valentines RGB? CMYK? Alpha? What Are Image Channels and What Do They Mean? How to Recover that Photo, Picture or File You Deleted Accidentally How To Colorize Black and White Vintage Photographs in Photoshop How To Get SSH Command-Line Access to Windows 7 Using Cygwin The How-To Geek Video Guide to Using Windows 7 Speech Recognition A History of Vintage Transformers [Infographic] Amazon Finally Adds Real Page Numbers to the Kindle Now You Can Print Google Docs and Gmail through Google Cloud Print AppBrain Enables Direct-to-Phone Installation Again Build a DIY Clapper to Hone Your Electronics Chops How to Kid Proof Your Computer’s Power and Reset Buttons

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• shell script to set time and date on ubuntu

  - by glapo

  my desktop CMOS battery is not working, therefore I have to set time and date each time my computer starts up. I want to create a shell script to automate the setting of date and time on my computer after each boot is complete. options that exist include: 1. buying a CMOS battery :- am considering this, but for the meantime a shell script will do. 2. using NTP to synchronize time and date with internet servers :- am not connected to the internet.

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• Does the use of debuggers have an effect on the efficiency of programmers? [closed]

  - by alain.janinm

  Possible Duplicate: Are debugging skills important to become a good programmer? I'm a young Java developer and I make a systematic use of the Netbeans debugger. In fact, I often develop my applications when I debug step by step in order to see immediately if my code works. I feel spending a lot of time programming this way because the use of debugger increase execution time and I often wait for my app to jump from a breakpoint to an other (so much that I've the time to ask this question). I never learned to use a debugger at school, but at work I've been told immediately to use this functionality. I started teaching myself to use it two years ago, and I've never been told any key tips about it. I'd like to know if there are some rules to follow in order to use the debugger efficiently. I'm also wondering if using the debugger is eventually a good practice? Or is it a loss of time and I've to stop now this bad habit?

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• Desktop Fun: Stargate SG-1 Customization Set

  - by Asian Angel

  Are you feeling nostalgic for the days of classic Stargate SG-1 adventure? Then get ready to dial up that DHD and gate into a whole new desktop with our Stargate SG-1 Customization set. Latest Features How-To Geek ETC How to Get Amazing Color from Photos in Photoshop, GIMP, and Paint.NET Learn To Adjust Contrast Like a Pro in Photoshop, GIMP, and Paint.NET Have You Ever Wondered How Your Operating System Got Its Name? Should You Delete Windows 7 Service Pack Backup Files to Save Space? What Can Super Mario Teach Us About Graphics Technology? Windows 7 Service Pack 1 is Released: But Should You Install It? Peaceful Alpine River on a Sunny Day [Wallpaper] Fast Society Creates Mini and Mobile Temporary Social Networks Page Zipper Unpacks Multi-Page Articles for Single-Page Display Minty Bug: Build an FM Bug Inside a Mint Container Get the MakeUseOf eBook Guide to Hacker Proofing Your PC Sync Your Windows Computer with Your Ubuntu One Account [Desktop Client]

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• Developing for Chrome App/Android?

  - by Johnny Quest

  I have been developing for win7 mobile (XNA/silverlight and will continue to do so, love everything about it) but I wanted to branch a few of my more polished games to google app store online, and perhaps android(though not sure, as with all the different versions it makes learning/loading applications a bit tricky) What is the most versatile language to start learning from chrome apps/android: Java would be excellent for android, but could I port it to a web app for chrome? (and its close to C#) Flash would work for a web app as I can just embed it into a html page (have done actionscript before, didn't care much for the IDE though), but would it also work on android? or I guess there is always C/C++ but haven't heard much about that, though I think it works for both (though C++ does interest me) Any advice would be excellent, thanks.

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• Which computer side has more salary chance in future programmer , sys admin , network admin , web developer

  - by Name

  I want to know which computer field has more probability of getting high salary with experience in the following fields 1)Programmer c , c++ , java 2)Sys admin MIcrosoft . linux 3)Network admin (Cisco ccna ccnp 4)web developer Any more idea will be good i work as web developer for 3 years and stiing at 40K$. I have to find new job and still look like i don't have offer more than 50K. may be i have chosen the wrong path. My friend in network admin has started from 65K and with experince he is going the ccnp or ccie with more high packages. I may e wrong , please correct me

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• Extract derived 3D scaling from a 3D Sprite to set to a 2D billboard

  - by Bill Kotsias

  I am trying to get the derived position and scaling of a 3D Sprite and set them to a 2D Sprite. I have managed to do the first part like this: var p:Point = sprite3d.local3DToGlobal(new Vector3D(0,0,0)); billboard.x = p.x; billboard.y = p.y; But I can't get the scaling part correctly. I am trying this: var mat:Matrix3D = sprite3d.transform.getRelativeMatrix3D(stage); // get derived matrix(?) var scaleV:Vector3D = mat.decompose()[2]; // get scaling vector from derived matrix var scale:Number = scaleV.length; billboard.scaleX = scale; billboard.scaleY = scale; ...but the result is apparently wrong. PS. One might ask what I am trying to achieve. I am trying to create "billboard" 3D sprites, i.e. sprites which are affected by all 3D transformations except rotations, thus they always face the "camera".

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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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• UDP Code client server architecture

  - by GameBuilder

  Hi I have developed a game on android.Now I want to play it on wifi or 3G. I have game packets which i want to send it form client(mobile) to server then to another client2(mobile). I don't know how to write code in Java to send the playPackets continuously to server and receive the playPacket continuously from the server to the clients. I guess i have to use two thread one for sending and one for receiving. Can someone help me with the code, or the procedure to write code for it. Thanks in advance.

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• How to Handle Managing a Coding Project With 8 Friends?

  - by Raul

  I usually code by myself but currently I need to do a java web-based project with 8 of my friends. I would like to ask the following questions: 1) How to document the development properly? Like how to keep a daily log? Any software or format suggested? What things do you think are important to be included in the log? 2) How to code together? Is there any software/IDE that allows a team to code together? Something ike google docs? 3) How to do a proper backup for a team project? Any software or tips to share?

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• How to reset .bashrc file which edited before to set PATH ANDROID sdk

  - by revan

  bash: export: `/home/entw/bin:/usr/lib/lightdm/lightdm:/usr/local/sbin:/usr/local /bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/bin': not a valid identifier bash: /home/entw/.bashrc: line 111: unexpected EOF while looking for matching `"' bash: /home/entw/.bashrc: line 112: syntax error: unexpected end of file entw@entwine-desktop:~$ This is the error i frequently getting in terminal, shows when opend termianl. The following commands i applied in terminal, sudo gedit $HOME/.bashrc and added some path varable like android SDK, and run the following command source ~/.bashrc got the error in terminal bash: export: `/home/entw/bin:/usr/lib/lightdm/lightdm:/usr/local/sbin:/usr/local /bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/bin': not a valid identifier bash: /home/entw/.bashrc: line 111: unexpected EOF while looking for matching `"' bash: /home/entw/.bashrc: line 112: syntax error: unexpected end of file entw@entwine-desktop:~$ but if i try to open agin that file shows the error file or directory not found. what do i do to set all correct ??, please any help? This forum i tried [forum]: http://forum.xda-developers.com/showthread.php?t=919425 "--point 2"

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• How to set multiple timezones in Gnome Classic?

  - by Serrano Pereira

  For some strange reason, additional timezones cannot be added to the clock using the date-time indicator in Gnome Classic (Ubuntu 12.04). I used Unity before I switched to Gnome Classic, and it was possible to add more timezones. Even in Gnome Classic I can see the other timezones in the menu of the date-time indicator which I added when I was still using Unity. When I go to System Settings Date and Time, there is no option for adding other timezones. How can I set additional timezones in Gnome Classic?

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• Exception while running an EJB program [closed]

  - by rajesh

  I'm a newbie to JEE. I'm trying a sample EJB3 program given in this website. while trying to run the client program, I get an exception like this [JBossManagedConnectionPool] Throwable while attempting to get a new connection: null org.jboss.resource.JBossResourceException: Could not create connection; - nested throwable: (org.jboss.resource.JBossResourceException: Failed to register driver for: com.mysql.jdbc.Driver; - nested throwable: (java.lang.ClassNotFoundException: com.mysql.jdbc.Driver from BaseClassLoader@4c19dd{VFSClassLoaderPolicy@35fd58{name=vfszip:/home/rajesh/workspace/jboss-5.1.0.GA/server/default/deploy/FirstJPAproject.jar/ domain=ClassLoaderDomain@17380fc{name=DefaultDomain parentPolicy=BEFORE parent=org.jboss.bootstrap.NoAnnotationURLClassLoader@76cbf7} roots=[MemoryContextHandler@9160338[path= context=vfsmemory://3j001-rho3wm-h8v3wfs4-1-h8v5pkwn-9u real=vfsmemory://3j001-rho3wm-h8v3wfs4-1-h8v5pkwn-9u], DelegatingHandler@25335794[path=FirstJPAproject.jar context=file:/home/rajesh/workspace/jboss-5.1.0.GA/server/default/deploy/ real=file:/home/rajesh/workspace/jboss-5.1.0.GA/server/default/deploy/FirstJPAproject.jar] I'm using Jboss5.1.0 and ejb 3.0 Please help me to get rid of this.

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• GA UA codes for testing site - set up

  - by Drew

  Anyone know the process for using a GA live UA code to test a site in development. I.e. I have a live site with a GA UA code attached, tracking live traffic data etc e.g. UA-123456. I've been told that there is a way to produce another code associated to the primary code to use on the testing version of my live site e.g. test code could be UA-123457. Can anyone shed some light on this? If not possible should I just set up a completely separate GA account for my testing site?

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• Set up development site on another server/host

  - by Ofeargall

  I'm developing a site for a client. They've got a site now that's hosted at hosting.com. I'm going to move them to my VM hosting solution at edge web but I want to run some tests and have the client approve the site before changing the name servers to the new site/hosting location. How do I make this happen? I'm running a red hat/Apache on linux for the edge web hosting. I don't have control of the domain name (i.e. the client controls that right now). Edgeweb has set up a dns zone for the domain name so that when the time comes to switch we're ready to go. I'm a web developer and I understand the technologies that make a user experience 'work' but I'm unfamiliar with the server jargon and all that so, please be patient. Thanks in advance.

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• Naming boolean field that is a verb

  - by dnhang

  In Java, by convention getter and setter for boolean fields will be isField() and setField(). This works perfectly fine with field names that are adjectives like active, visible, closed, etc. But how do I name a field that has meaning of a verb, like haveChildren? Add _ing to the verb (havingChildren), maybe? Edit: to clarify, I don't have control of the method names (getter and setter), they are auto-generated by the IDE. So what I need is an appropriate field name so that when the IDE generate a getter for it, it make senses. For example, hasChildren is a perfect field name, but when the IDE generate the getter for the field it would be isHasChildren. How do I solve this?

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• convert image to spritesheet of tiles for isometric map?

  - by Paul

  is there a way to convert an isometric image (like the first image) to a spritesheet (like the second image), in order to place each image on the isometric map with the code? The map looks like the first image, but some buildings are bigger than just one tile, so I need several squares (let's say the first image is a building, made of multiple tiles with different colors), and each square is placed with an offset of 64x32. The building is created in Blender and I save the image with the isometric perspective. But I have to split each square from this image in order to have the spritesheet, maybe there is smarter way, or a java software that would make the conversion for me?

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• How To Set Different Speeds for Your Trackpad and External Mouse

  - by YatriTrivedi

  Your laptop’s got a trackpad, you use a mouse for gaming, and you’re tired of manually switching settings constantly. Here’s how to separate both devices and how to set up a hotkey to switch between two settings on one device. Latest Features How-To Geek ETC How to Get Amazing Color from Photos in Photoshop, GIMP, and Paint.NET Learn To Adjust Contrast Like a Pro in Photoshop, GIMP, and Paint.NET Have You Ever Wondered How Your Operating System Got Its Name? Should You Delete Windows 7 Service Pack Backup Files to Save Space? What Can Super Mario Teach Us About Graphics Technology? Windows 7 Service Pack 1 is Released: But Should You Install It? Peaceful Alpine River on a Sunny Day [Wallpaper] Fast Society Creates Mini and Mobile Temporary Social Networks Page Zipper Unpacks Multi-Page Articles for Single-Page Display Minty Bug: Build an FM Bug Inside a Mint Container Get the MakeUseOf eBook Guide to Hacker Proofing Your PC Sync Your Windows Computer with Your Ubuntu One Account [Desktop Client]

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• How to teach computer science ?

  - by proferikson

  I am just starting to teach computer science. It's just the basic level. I'm finding that I sometimes don't know how to approach topics in a way that lets students easily understand. I've found that the best thing is to use analogies. A terrible one, that worked well, was presenting recursion by using the process of eating a burger. (You eat one bite, then you eat the rest). Interesting real world examples do wonders here. I'd like to know the techniques you have used for teaching, or teachers you've had have used that proved particularly effective. I'd also like to know your best analogies and examples for topics in CS101, especially for those harder to grasp topics. I'm teaching the class in Java (as required).

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• Slick2D: Animation not being parsed from spritesheet correctly

  - by user2066880

  I have a 960x960 spritesheet with each tile being 192x192. I initialized my spritesheet and animation like so: spritesheet = new SpriteSheet("resources/spritesheets/player.png", 192, 192); walkingLeft = new Animation(spritesheet, 3, 0, 0, 1, true, 20, true); When I attempt to render the animation, I get a java.lang.ArrayIndexOutOfBoundsException: -1 error. This error doesn't occur when I'm creating an animation from images in the same row. Therefore, I'm assuming that the error is being caused because of the way Slick is handling horizontal scanning (going to the next row after reaching the end).

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• Better drivers for SiS 650/740 integrated video?

  - by Bart van Heukelom

  I installed Xubuntu 10.10 on an old box today and the graphical performance is horrid. According to lspci, the video card is this: 01:00.0 VGA compatible controller: Silicon Integrated Systems [SiS] 65x/M650/740 PCI/AGP VGA Display Adapter (prog-if 00 [VGA controller]) Subsystem: ASUSTeK Computer Inc. Device 8081 Flags: 66MHz, medium devsel, IRQ 11 BIST result: 00 Memory at f0000000 (32-bit, prefetchable) [size=128M] Memory at e7800000 (32-bit, non-prefetchable) [size=128K] I/O ports at d800 [size=128] Expansion ROM at <unassigned> [disabled] Capabilities: <access denied> Kernel modules: sisfb Is there a way to make it faster? Alternative drivers? The additional drivers tool shows nothing. I'm specifically interested in improving Java's Java2D rendering speed, because I'll be running a "stat screen" written in that language on it.

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