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• Pixel Shader Effect Examples

  - by Chris Nicol

  I've seen a number of pixel-shader effect examples, stuff like swirl on an image. But I'm wondering if anyone knows of any examples or tutorials for more practical uses of shader effects? I'm not saying that a swirl effect doesn't have it's uses, it's just that many of the examples I've found have the basic effect explained and don't go into how it might be used subtly with another effect or transition to produce a wonderful effect. There's a video here, that outlines all the WPF Effects Library, but I'm not sure how I would use some of them in a practical context. For example, when Flash 8 came out with effects like blur, I found a wonderful video that showed how to use the blur effect to create a cool effect with speeding text, that video inspired many ideas of what I could do with the effects in Flash 8. I'm looking for something similar with Pixel Shader Effects.

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• RPG Game loop and class structure (cocos2D for iPhone)

  - by mac_55

  I'm looking to make an RPG with Cocos2D on the iPhone. I've done a fair bit of research, and I really like the model Cocos2D uses for scenes. I can instantiate a scene, set up my characters etc. and it all works really nicely... what I have problems with is structuring a game loop and separating the code from the scenes. For example, where do I put my code that will maintain the state of the game across multiple scenes? and do I put the code for events that get fired in a scene in that scene's class? or do I have some other class that separates the init code from the logic? Also, I've read a lot of tutorials that mention changing scenes, but I've read none that talk about updating a scene - taking input from the user and updating the display based on that. Does that happen in the scene object, or in a separate display engine type class. Thanks in advance!

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• Understanding what SPARQL is

  - by user73119

  This is a terribly beginner series of questions, but after reading through a good 30 SPARQL tutorials I can't seem to wrap my head around what SPARQL is or how to begin using it. Is it executed on the client side? Is microsoft somehow going to be able to mess this up? Can you use a common relational database (SQL)? Are there particular resources you recommend over others for learning? Do you feel it is premature to begin investing myself in this? Best way to get set up and running to start tinkering? The RDFA examples I have seen are very inspiring. I am currently a big proponent of using microformats but would really like to take it further. I currently develop in PHP, but have only found a Java library.

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• nfs client on ubuntu 9.10, /etc/init.d/nfs-common does not exist

  - by Denali

  This seems like a trivial problem, but I can not find a solution for several days now. I am trying to configure an nfs client on ubuntu 9.10 (64 bit). All the tutorials I've read say I need to restart a few things, such as portmap, and also nfs-common. Specifically: sudo /etc/init.d/nfs-common restart However, this file (/etc/init.d/nfs-common) does not exist. sudo apt-get install nfs-common returns "nfs-common is already the newest version." When I try: sudo service nfs restart I get: nfs: unrecognized service What am I missing here? Thank you to the kind soul who can help me with this.

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• Hadoop WordCount example stuck at map 100% reduce 0%

  - by Abhinav Sharma

  [hadoop-1.0.2] ? hadoop jar hadoop-examples-1.0.2.jar wordcount /user/abhinav/input /user/abhinav/output Warning: $HADOOP_HOME is deprecated. ****hdfs://localhost:54310/user/abhinav/input 12/04/15 15:52:31 INFO input.FileInputFormat: Total input paths to process : 1 12/04/15 15:52:31 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable 12/04/15 15:52:31 WARN snappy.LoadSnappy: Snappy native library not loaded 12/04/15 15:52:31 INFO mapred.JobClient: Running job: job_201204151241_0010 12/04/15 15:52:32 INFO mapred.JobClient: map 0% reduce 0% 12/04/15 15:52:46 INFO mapred.JobClient: map 100% reduce 0% I've set up hadoop on a single node using this guide (http://www.michael-noll.com/tutorials/running-hadoop-on-ubuntu-linux-single-node-cluster/#run-the-mapreduce-job) and I'm trying to run a provided example but I'm getting stuck at map 100% reduce 0%. What could be causing this?

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• Resources for rails widget creation

  - by Kenji Crosland

  My rails app is about to go live and I'm trying to figure out how to create a widget based on data on the site. My Javascript is not too hot--limited to the O'reilly head first book on JS. I can read simple Javascript okay but when it comes to writing it I'm a little lost. That said, I hope to roll out a widget, maybe a wordpress plugin too soon after my app is launched. Does anyone know of any rails plugins, javascript templates, tutorials or books that can get me going? I did ask a similar question before here: But my limited knowledge of JS kept me from implementing the suggested answer properly.

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• Adaboost algorithm and its usage in face detection

  - by Hani

  I am trying to understand Adaboost algorithm but i have some troubles. After reading about Adaboost i realized that it is a classification algorithm(somehow like neural network). But i could not know how the weak classifiers are chosen (i think they are haar-like features for face detection) and how finally the H result which is the final strong classifier can be used. I mean if i found the alpha values and compute the H ,how am i going to benefit from it as a value (one or zero) for new images. Please is there an example describes it in a perfect way? i found the plus and minus example that is found in most adaboost tutorials but i did not know how exactly hi is chosen and how to adopt the same concept on face detection. I read many papers and i had many ideas but until now my ideas are not well arranged. Thanks....

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• Error when starting a tab activity in Android?

  - by ATDeveloper

  I followed the directions verbatim in this Android tutorial, copying/pasting the code from the site to my app. http://developer.android.com/resources/tutorials/views/hello-tabwidget.html However, when I try to run in the Android emulator, I get the error: "The application Hello Tab Widget has stopped unexpectedly. Please try again." I tried debugging by introducing a breakpoint in the first line of the onCreate method, but the error occurs before the breakpoint is even hit. Any idea of what is going wrong, or any other way I can debug this issue? I am using Eclipse.

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• android customize gallery focus problem

  - by Faisal khan

  Gallery With reference to the following link http://www.anddev.org/novice-tutorials-f8/a-android-widget-gallery-example-t332-60.html In above link they are actually animating selected item of the gallery but i want to change the picture when it is selected, for that i am having following code. Problem is when i use roller ball to scroll gallery from left to right or right to left to right after scroll on image focus automatically shift to next widget. public class SizingGallery extends Gallery{ public SizingGallery(Context context, AttributeSet attrs) { super(context, attrs); } @Override protected boolean getChildStaticTransformation(View child, Transformation t) { t.clear(); ImageView selectedChild = (ImageView) getSelectedView(); ImageView iv = (ImageView) child; BrowseMapCategoryRow cr = (BrowseMapCategoryRow) iv.getTag(); //Following line change the image resource that causing defocus gallery iv.setImageResource((iv == selectedChild)?cr.getSelectedImgSrc():cr.getUnSelectedImgSrc()); return true; } }

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• Cannot change font size in Tk

  - by FireAphis

  Hello, I'm trying, for the first time, to create a GUI in Ruby using Tk. I've copied a code snippet from one of the numerous web tutorials and try to change the font for one of the labels, but nothing seems to affect how the text is presented. Here's the code: require 'tk' root = TkRoot.new('title'=>'MCIS') defaultFont = TkFont.new("weight"=>'bold', "size"=>20) Lbl = TkLabel.new(root) do text "Boooo" borderwidth 5 font defaultFont foreground "red" relief "groove" grid('column'=>3, 'row'=>0) end Tk.mainloop() I see the effects of all the parameters of the label but not the font. I've tried to change the size, the weight, give different family names, leave just one parameter; nothing works - the font stays default as it was. Surprisingly it doesn't report any errors, everything looks fine. Maybe it's versions problem? I run these: Linux Centos 5 Tk 8.4.13 Ruby 1.8.5 ruby-tcltk 1.8.5 Also, don't know if it is important, I ran it via Xming from WinXP machine.

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• Dashcode development for iPhone resources

  - by gonso

  I've been developing web applications and iPhone applications for years. Now I want to create a web application oriented to the iPhone browser. I willing to use Dashcode, since it seams to have tons of cool features that make my web app look like an native iPhone app. The problem I face is twofold: On one side I don't know it Dashcode development will allow me to do all I want (session control, runtime datasources, etc); on the other side I'm having a hard time finding good documentation, tutorials and books on Dashcode programing for the iPhone. Looks like 90% of the links out there are for Dashcode widgets. Can you advise me on the best resources to learn Dashcode (for mobile Safari) programming? Thanks Gonso

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• Terminology for web app running on hardware

  - by Lily

  Hi, Let me start by saying I feel very silly asking this, hence the newbie tag. I am trying to investigate how to develop an UI application that will run directly on hardware. This will be very much like when you access the web based application within your router. I don't really know how what keywords and terminology to use so that i can search tutorials on the net. Can anybody give me the correct terms? If you have tutorial suggestions, they are welcome as well.

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• SIP and Java, where to start and with what?

  - by Senne

  I want to implement the SIP protocol in java and would want to be able to create different clients (5 or more) and make them connect to a proxy server. This is all for testing purposes so I would like to be able to see well what's happening on a rather low level. The clients should first be able to communicate trough text and later on maybe also by audio. (If I ever get that far) I already read a bit about the JAIN libraries and what I understood from that is that they are not really well suited for the server side? I also didn't really find any proxy server examples, tutorials, using JAIN. I also found this SIP Servlet Tutorial book, I used HTTP servlets in the past but should I prefer servlets or JAIN or ...? I'm quite new to SIP so I don't really know where to start or what to choose in combination with java.

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• Bug Running Android Tutorial HelloTabWidget under SDK 1.5: "setCurrentTag(getIntent())"

  - by Matt J.

  does not compile. Indeed: even in 1.5, this api, getIntent(), is already listed as deprecated. The error message I get complains that getIntent() does not return a String, but setCurrentTab() expects a string. If I guess and change the line to read: "tabHost.setCurrentTab(1); // was setCurrentTab(getIntent())", then it compiles, builds, but does not run. I get the "stopped unexpectedly" error message from the emulator. I cannot even get Log.d to output, so it seems that it stops 'unexpectedly' very early. So the first and main question is: what is the correct fix to "tabHost.setCurrentTab(getIntent())" in the final line of OnCreate() in http://developer.android.com/resources/tutorials/views/hello-tabwidget.html? The second and simpler question is: did I guess right in replacing 'mTabHost' with tabHost in the one place where that occurs?

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• dataannotation metadatatype register dll in global.aspx (linq to sql)

  - by mazhar

  I am trying to use dataannotation validation(I am not able to Fire the annotations as yet) in my mvc application. with reference to this article I want to confirm http://www.asp.net/mvc/tutorials/validation-with-the-data-annotation-validators-cs I am using vs 2008 professional edition . Do I really need to download Microsoft.web.mvc.dataannotation dll (The other dll is already present in the vs). to use(fire) datannotation on the page.? I am using partial views as well on the pages with dataviewmodel class(I will be using formviewmodel class for validation?)

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• IoC container configuration

  - by nivlam

  How should the configuration for an IoC container be organized? I know that registering by code should be placed at the highest level in an application, but what if an application had hundreds of dependencies that need to be registered? Same with XML configurations. I know that you can split up the XML configurations into multiple files, but that would seem like it would become a maintenance hassle if someone had to dig through multiple XML files. Are there any best practices for organizing the registration of dependencies? From all the videos and tutorials that I've seen, the code used in the demo were simple enough to place in a single location. I have yet to come across a sample application that utilizes a large number of dependencies.

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• Pure C# open source PCM to Ogg convertor?

  - by Ole Jak

  Microsoft Silverlight 4 is in beta. It supports PCM audio output. It would be madness to stream PCM over internet (for ex in P2P chart webApp) so we need Pure C# open source PCM to Ogg convertor. No unmanaged code, nothing going out of .net sandbox. So does any one know such Pure C# open source PCM to Ogg convertor? What do I need: Open Source Libs for encoding. Tutorials and blog articles on How to do it, about etc. BTW: why Pure C#? - because Silverlight 4 does not support unmanaged or just not C# DLL's. BTW2: this question is similar to this one but it is different because Ogg is Open Source, free while mp3 will not be free until 2010

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• IText Lines Per Page?

  - by exit174

  I have used IText(Sharp) to make PDFs from raster images but have never used IText to build text based PDF's. In this new scenario, I have N words of ASCII text that I need to add as text pages to a new PDF. Each page should be 8.5 x 11, .5 margins, using some monospaced font. Is IText(Sharp) smart enough to automatically apply line and page breaks where necessary or do I need to do this manually? Are their any good IText tutorials for this scenario? thanks! scottm

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• WPF - RibbonControlLibrary not supported with Visual Studio 2010 ?

  - by KroaX

  Hi guys, Today i licensed and downloaded the WPF RibbonControlsLibrary from Microsoft which is an extension to the WPF Toolkit. I've read some tutorials to implement an examlpe here When I tried the example is sadly noticed that in XAML i could not access the referenced library. xmlns:ribbon="clr-namespace:Microsoft.Windows.Controls.Ribbon;assembly=RibbonControlsLibrary" <ribbon:Ribbon .... > I found out that the Problem lies within Visual Studio 2010 , because in Visual Studio 2008 everything works fine. Does anyone have a solution for this issue or a workaround to use the library in Visual Studio 2010 ?

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• HTML5 web storage: can different websites overwrite each other’s data on a user’s computer?

  - by Deepak Mahalingam

  I have a few questions regarding the concept of HTML5 storage. I went through the w3c specification, books and tutorials on the same, but still I am a bit unclear about certain concepts: Assume that I access Website A. Some JavaScript runs in my browser that sets a key value pair, say ('username','deepak'). Then I access Website B which also adds a key,value pair in the localstorage as ('username','mahalingam'). How will they both be differentiated? Will Website B override the value set by website A in my localstorage? How can we ensure that a website would not erase all of my localstorage?

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• iTextSharp and VBnet question about headers

  - by bpSz

  Hello! I'm wondering how can I put a header into my pdf file, cause i've tried the tutorials from here: http://itextsharp.sourceforge.net/tutorial/ch04.html And it have not worked. Ive done this: Dim head As New HeaderFooter(New Phrase("This is page: "), False) head.Border = Rectangle.NO_BORDER document.Header = head But VS2008 says that HeaderFooter it's not defined (line 1), and Footer it's not a member of "iTextSharp.text.document" (line 3). I've already included the imports at the begining of my code and i don't have any other problems with the iTextsharps (i mean that it is working apart of the header problem): Imports iTextSharp.text Imports iTextSharp.text.pdf Imports System.Data.SQLite Imports System.IO So please, can anyone explain to me how can i set a header for my pages? Regards

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• VS2010 add-in custom menu item in files of Solution Explorer

  - by NewProgrammer

  Hey guys, I need to create a custom menu item for Visual Studio 2010 Add-in in C#, but I have had no luck in coming with a solution anytime soon. I am aware that there was a similar post: http://stackoverflow.com/questions/2486818/visual-studio-add-in-adding-a-context-menu-item-to-solution-explorer But it did not help, as the blog follows the process through the integration package, and the video is done through VB. I had attempted to convert the VB syntax to the C# syntax, but about half way through the video, the Add-in methods has significantly changed from 2005 to 2010, as some of the methods have removed or changed. Is there any good tutorials on making a custom menu item on the Solution Explorer in the lastest Visual Studio in C#, and is there a good website that could be used as a reference for looking over the VS add-in API? I've used Microsoft's main website, however it is confusing and wordy, which is difficult to understand and find the methods, properties, or commands that I am looking for. Any help would be appreicated, Thanks in advance.

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• Is there a 2d sprite library for webgl?

  - by Devon

  I am looking to build a 2d game using WebGL. I want the hardware acceleration that WebGL provides and I cannot get this from the 2D canvas context in the canvas tag. With that said, is there a tutorial on creating 2D sprites using webGL? Or, better yet, is there a 2D sprite library for WebGL? Ideally, I'm looking for something like cocos2d ported to WebGL. Not surprisingly, all of the demos, tutorials and libraries I have found for WebGL focus on 3D manipulation. Are there any WebGL libraries that support 2D sprites?

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• MIPS processors : Are they still in use? Which other architecture should I learn?

  - by claws

  I've been programming for x86 & x86-64 in assembly language for few months. Now, I want to move on to some different kind of processors. MIPS, SPARC, PowerPC, Itanium, ARM of these I found ARM is being widely use. But the books I see that tutorials & books teach about MIPS more than all these other architectures. Why is MIPS so popular? Are MIPS processors still in use? Which architecture should I go for?

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• Simple RSS parser for Android

  - by Andrioid

  Hello, I am trying to create my first Android application and I'm not all that experienced with Java development. In short, the application needs to do the following: On click, fetch a RSS feed online Parse it for data Show the data I've been browsing for guides, tutorials and documentation but the parsers I've found so far only deal with local strings or files or are way too complicated for me to go through at this point. Can you provide me a link to a good XML parser class (that is included in the Android SDK) Provide me with an example of its use. An example of how the feed would get fetched from the Internet (curl? or something internal?) (Bonus) Tips and hints on how this would be best achieved. Thanks in advance.

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