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• Get Your Workshop Hands On!

  - by Justin Kestelyn

  Now that 2010 is behind us, that means a fresh set of Developer Day workshops (still free, always free) are ahead of us! Developer Day workshops are free, hands-on workshops that give you the software and skills to tame that learning curve and reach the next level in your technical knowledge. We have a range of entrees on the menu, including Java Development, Database Application Development, Fusion Development (Oracle ADF), and more. Most of these workshops let you walk away with a fully functional, VirtualBox-based software appliance that you can use for continued learning. Here's a short list of workshops for which you can register right now: - Java: Boston, March 8- Database App Development: Dallas, March 9- SOA Development: Reston, March 9- Data Integration: Seattle, March 15 + others planned for Toronto, Philadelphia, Shanghai, Perth, Istanbul, and many other cities in 2011! See this URL for more workshop info as it becomes available.

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• Can I speed up File Sync for Ubuntu One?

  - by tapan

  I am using ubuntu 11.04 on my home laptop and the same on my work laptop. I just wanted to sync the work folders on my home laptop to my office laptop which is ~300Mb of data. This would normally be a short download but ubuntu-one is taking forever to sync it. Any ideas what could cause this? I am not behind any firewall or anything of that sort. I have not checked the limit bandwidth box in the preferences.

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• Share links with <script src=""> SEO

  - by gansbrest

  Hi, I would like to create a share link to my website using javascript: script src="[url-to-my-script]" Basically the main idea behind this is to render HTML block with an image and link to the website. By using JavaScript approach I can control the look and feel of that link + potentially I could change the link html in the future without touching partner websites. The only potential problem I see with this approach is SEO. I'm not sure if google will be able to index that link to my website, since it's generated by javascript.

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• Tic-Tac-Toe game AI

  - by David Jones

  I'm looking into creating a simple tic tac toe/noughts and crosses game in Actionscript3 and am trying to understand the ideas behind the AI used in a game like this. I've seen some simplistic examples online but from what I've read a game tree or something like minimax is the best way to go about this. Can anyone help explain or reference any good examples of this? I've seen that there is a library called as3ds - data structures for game developers which has a number of classes that might help tie this together? Any info/examples or help is much appreciated.

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• About floating point precision and why do we still use it

  - by system_is_b0rken

  Floating point has always been troublesome for precision on large worlds. This article explains behind-the-scenes and offers the obvious alternative - fixed point numbers. Some facts are really impressive, like: "Well 64 bits of precision gets you to the furthest distance of Pluto from the Sun (7.4 billion km) with sub-micrometer precision. " Well sub-micrometer precision is more than any fps needs (for positions and even velocities), and it would enable you to build really big worlds. My question is, why do we still use floating point if fixed point has such advantages? Most rendering APIs and physics libraries use floating point (and suffer it's disadvantages, so developers need to get around them). Are they so much slower? Additionally, how do you think scalable planetary engines like outerra or infinity handle the large scale? Do they use fixed point for positions or do they have some space dividing algorithm?

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• How to reset Compiz/Unity to defaults?

  - by Stramato

  I tried to activate some compiz effect via ccsm (I think wobbly windows) and compiz crashed and froze up the screen. So I used the Control+Alt+Backspace keystroke to force logout. Then I logged back in. Unity wasn't there, just a (non-unity) panel at the top with file, edit, and the like. I was able to pull up a terminal and launch ccsm, only to find almost all settings wiped out. I turned everything back on that I thought should be on, but I don't know if I got everything. Also, now whenever I open up a non-maximized window, it opens up in the top left corner with the title bar behind the unity panel. So what I need is a list of everything that needs to be on in ccsm, and a way to get windows to NOT open in the corner, preferably without having to reset unity or compiz.

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• OSB, Service Callouts and OQL - Part 1

  - by Sabha

  Oracle Fusion Middleware customers use Oracle Service Bus (OSB) for virtualizing Service endpoints and implementing stateless service orchestrations. Behind the performance and speed of OSB, there are a couple of key design implementations that can affect application performance and behavior under heavy load. One of the heavily used feature in OSB is the Service Callout pipeline action for message enrichment and invoking multiple services as part of one single orchestration. Overuse of this feature, without understanding its internal implementation, can lead to serious problems. This post will delve into OSB internals, the problem associated with usage of Service Callout under high loads, diagnosing it via thread dump and heap dump analysis using tools like ThreadLogic and OQL (Object Query Language) and resolving it. The first section in the series will mainly cover the threading model used internally by OSB for implementing Route Vs. Service Callouts. Please refer to the blog post for more details. 

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• Google Games Chat #6

  Google Games Chat #6 Google Games Chat is back once again. What kinds of crazy topics will be talking about this time around? Will Todd ever finish Skyrim? What Google employee and/or homeless person is sleeping behind the couch this week? Tune in and find out! Ask us questions in the moderator link! We might even get around to answering them! From: GoogleDevelopers Views: 0 0 ratings Time: 00:00 More in Science & Technology

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• User prompts (MessageBox) with MVVM

  - by mukapu

  The problem statement: I am tired of thinking how to show a simple message box or user prompt and act based on the response in Model-View-View-Model (MVVM). Common approaches: - It's ok, let's just do this one thing from ViewModel and mock this out for unit testing - Design my own dialog, then what to do from there - Can I write something in view code behind, ah yes, that seems to be the only way out, as anyway MVVM is still not matured...  - and what not?   I am pretty much one among the few frustrated out in this world looking for some convincing answers. I think we can do it a little neater without having the feeling of violating any of our self defined rules! Solution: The Control - Implement a simple control with no designer visibility. - Allow a property to be bound to tell when to show the MessageBox - Provide command binding for possible user actions, Yes, No, Cancel... How do I Use? - Just place the necessary XAML tags in the view - Implement the command for all user actions in the View Model - Run unit tests on the commands

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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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• Kubuntu 11.10: How to remove "Search and launch"

  - by user38489

  Is it possible to remove the "Search and launch" whateveritis from my "desktop"? I've actually tried both Desktop and Netbook modes, but it stays there in both of them. I'm not afraid of editing files in the ~/.kde dir, but I would be really disappointed if this is the only way to do it. [more details/rants] I was able to wipe out several things but I've ended up with a black window that's movable (Alt-click) but not removable. Beside being surprised by the performances, I find Kubuntu extremely unfriendly, and I can't find the logic behind the items of the interface. I've tried to search for documentation, but what I've found is not updated and doesn't include the Netbook interface.

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• OpenGL Drawing textured model (OBJ) black texture

  - by andrepcg

  I'm using OpenGL, Glew, GLFW and Glut to create a simple game. I've been following some tutorials and I have now a good model importer with textures (from ogldev.atspace.co.uk) but I'm having an issue with the model textures. I have a skybox with a beautiful texture as you can see in the picture That weird texture behind the helicopter (model) is the heli model that I've applied on purpose to that wall to demonstrate that specific texture is working, but not on the helicopter. I'll include the files I'm working on so you can check it out. Mesh.cpp - http://pastebin.com/pxDuKyQa Texture.cpp - http://pastebin.com/AByWjwL6 Render function + skybox - http://pastebin.com/Vivc9qnT I'm just calling mesh->Render(); before the drawSkyBox function, in the render loop. Why is the heli black when I can perfectly apply its texture to another quad? I've debugged the code and the mesh-render() call is correctly fetching the texture number and passing it to the texture-bind() function.

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• Garbled display after Ubuntu upgrade to 2.6.32-2* kernel

  - by Matthias

  I was running Ubuntu 9 (Karmic Koala) with no problems. I recently upgraded to Ubuntu 10 (Lucid Lynx) and cannot use it normally. After I log in, the screen scrambles (a purple/green mess)--impossible to see anything, although I can get out by marking the spot on the screen to click for a restart, so Linux is working behind the scenes. If I start in recovery mode with basic graphics, I have no problems at all (other than limited functionality). If I start the old 2.6.31-22 kernel, I see a bunch of "unmountable" errors in the startup script, but I can use Linux normally with no apparent problems. I'm running an IBM ThinkPad A30 with ATI Mobility graphics. Just to reiterate, the screen looks normal until I log in, at which point it goes bonkers. What do I need to change in order to fix this?

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• Confusion installing mongodb manually because of sitting behing a proxy

  - by black sensei

  I am forced to install mongodb manually on an Ubuntu server because the machine sits behind a proxy and there is no way to temporary open port 11371 for key exchange to happen. I am following this official mongoDB tutorial. So I downloaded the tgz and extracted it in /usr/local/bin/mongodb. Where I got confused is when assigning the ownership of the /data/db to the user mongo. So who creates the user mongo? How to get control-scripts working?

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• Rendering transparent textures in directX

  - by Vibhore Tanwer

  I am working with a directX application with WPF, I am facing a problem with videos and images that contains transparent pixels, I have to draw a color in background an then a video/image over it. What I expect is background color should be visible while playing video only non transparent pixels should be visible but what I get is a black background behind the video. I am using following settings on device to achieve alpha blending : device.RenderState.SourceBlend = Blend.SourceAlpha; device.RenderState.DestinationBlend = Blend.InvSourceAlpha; device.RenderState.AlphaBlendEnable = true; What am I missing here? What is the best approach to handle transparent videos? Any help will be of great value to me.

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• Own a book

  - by Rajesh Pillai

  Its a pleasure to introduce my first initiative, http://ownabook.org/,  which is live now and is in beta.  Go get in the queue to grab your hardcopy of your favorite book or audio as applicable and when published.There is no catch.  This site is being built using ASP.NET MVC 3, jQuery and other good stuff.  I will open the source once the beta period is over, and filled with more functionality.Every month a winner will be selected and couriered the book.   The intent behind this service is to help motivate to keep the reading habits alive.  Though it is never guaranteed the winner will read the book, but, nevertheless, being on the positive note is always a good thing.Hope you will like the service.

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• Why does Linux/Ubuntu have an unorganised install solution?

  - by Matthew

  I started using Windows 7 again to play some of my games I had been missing and I have to say I've been relieved to be reintroduced to the standard installation area "Program Files". From what I've noticed on almost every Linux distribution there is like 5 different areas where games/programs or other odds and ends end up. When you install something, I feel as though you pretty much have to guess where it installed at. Which honestly don't make any sense to me. So my question is, why does it appear as though there is no standard on Linux/Ubuntu? I'm not saying it's a bad thing. I just want to understand the reasons behind it.

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• How to restart WiFi interface without rebooting (it drops connection)?

  - by Dima

  I boot into ubuntu and it connects to the Wifi network fine. After about 10-15min the DNS stop resolving any website and a couple of minutes later network-managers tells me that I'm disconnected and tries to reconnect constantly to my router and fails to do it. Upon Ubuntu restart everything works fine for the first 10-15min again. When I boot into Mac OS X everything is fine with the same connection! How do I restart wifi interface? sudo ifdow wlan0 just tells me that wlan0 is not configured and wlan0 doesn't appear in /etc/network/interfaces either, which I find strange.... (unless network-manager is doing it behind my back).

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• Fast Track Data Warehouse 3.0 Reference Guide

  - by jchang

  Microsoft just release Fast Track Data Warehouse 3.0 Reference Guide version. The new changes are increased memory recommendation and the disks per RAID group change from 2-disk RAID 1 to 4-Disk RAID 10. Memory The earlier FTDW reference architecture cited 4GB memory per core. There was no rational behind this, but it was felt some rule was better than no rule. The new FTDW RG correctly cites the rational that more memory helps keep hash join intermediate results and sort operations in memory. 4-Disk...(read more)

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• vlc issue with unity

  - by bob

  I'm using ubuntu 12.04 with unity 3d. I am having troubles to lock vlc (version: VLC media player 2.0.1 Twoflower (revision 2.0.1-0-gf432547)) to the left panel. It doesn't behave the same way other applications do. This is a fresh install from the repo, I didn't change any settings. Ubuntu 12.04 is also a fresh install. For example, (left) clicking on it doesn't bring it to front, but creates a new instance (this in particular is very annoying, if it gets behind another window, that happens to be maximized, there is no way to bring it back up). It also doesn't have a right arrow to say the number of instances there is. Any way around that ?

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• Clicking on clues and other objects in a 2D cluedo like game

  - by Anearion

  I'm a java/android programmer, but I don't have any experience in game programming, I'm already reading proper books, like "Pro Android Games", but my concerns are more about the ideas behind game programming than the techniques themselves. I'm working on a 2D game, something like Cluedo to let you understand the genre. I would like to know how should I act with the "scenes", for example, a room with a desk, TV, windows and a lamp. I need to make some items tappable and others not. Is it common to use one image (invisible to the user) with every different item a different color, then call the getColor() method on the image? Or use one image as background, and separate images for all the items? If the latter, how can I set the positioning? and should I use imageView or imageButton? I'm sorry if those are really low quality questions, but as "outsider" ( I'm 23 and still finishing my university ) it's pretty hard learn alone.

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• How to define a natural id in database?

  - by gcc

  There are a lot of manuals. I am trying to create an database to hold information of these documents. But, there is a small problem. How can I give meaningful id to the manuals? Are there any standard or logic behind the giving meaningful id to the documents? If there is no standard, can you tell me how I should do that? example: table : manual id | manual name EDIT: Not Meaningful ID 1 or M1 or foo 2 C2 bar 3 P123 name ... ... ... (i) (ii) (iii) (i) Not meaningful for me because if some item deleted, there can be gap. ex 1 33 100. (ii) random character can be confusing when one try to give a name to new manual (iii) Why giving name is not preferred is because finding a name to the manual as ID is hard after 500 manuals. Meaningful : New ID * Can be easily produced even if after 1000 manuals * Should not be so complicated

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• HTML5 clicking objects in canvas

  - by Dave

  I have a function in my JS that gets the user's mouse click on the canvas. Now lets say I have a random shape on my canvas (really its a PNG image which is rectangular) but i don't want to include any alpha space. My issue lies with lets say i click some where and it involves a pixel of one of the images. The first issue is how do you work out the pixel location is an object on the map (and not the grass tiles behind). Secondly if i clicked said image, if each image contains its own unique information how do you process the click to load the correct data. Note I don't use libraries I personally prefer the raw method. Relying on libraries doesn't teach me much I find.

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• how to get started with a game engine [closed]

  - by user19343

  I'm a 3rd year Computer Science student and I would like to get started with building a game engine or at least tinkering with making one. I am curious if there are any good resources to use to get started. I get the idea behind different pieces in the engine, but I'm not really sure about how they fit together. Is there anything out there to help teach me the skeleton of a game engine? So far I've been playing with the idea of a game engine that uses modules built in a circular linked list so that each can do it's computing and then pass move to the next piece of the engine to work.

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• Swap is not copied back into physical memory

  - by GradGuy

  I have a question regarding swap and physical memory. Often times I run a program that requires a lot of memory and as a result I can see some of the data is copied from the physical memory into swap. However, once the program is terminated, and the physical memory is freed I can still see a considerable amount of data on swap which significantly slows down the system and is annoying! What is the reason behind this and how does the OS decide which part of data should go to swap? How long is this data supposed to be there and how is it "freed"?

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